EM 3732-II

Features
AES3 digital audio output with external word clock synchronization Switching bandwidth up to 184 MHz Integrated antenna splitter for daisy-chaining up to 8 devices Intuitive user interface with OLED display Network integration via Ethernet for WSM
software on Macs and PCs The Wireless Systems Manager (WSM) software for Macs and PCs enables the monitoring and control of all device parameters during live performances. This software can be downloaded free of charge at www.sennheiser.com.
The EM 3731/3732-II is a true diversity receiver that is characterized by high transmission reliability, exceptional audio quality and simple operation. The frequencies are adjustable in 5 kHz steps. Special features include the DSP-based HiDyn plus expander and its transformer-balanced audio outputs. The EM 3732 COM-II is also equipped with a command audio output. The EM 3731/3732-II is available in L, N and P frequency range variants and as a twin receiver (EM 3732-II) or single receiver (EM 3731-II).
Architects Specifications
A true diversity receiver with a high switching bandwidth should ensure maximum flexibility and reliability during live performances. The display should be clearly laid out and easy to operate. It should be possible for all settings to be carried out centrally on the device using a jog dial. It should be possible to cascade (daisychain) up to 8 devices using an integrated antenna splitter. The digital output according to the AES3/EBU standard must allow for the direct connection to digital mixing consoles. The receiver must be compatible with Sennheisers 3000 and 5000 systems.

Technical Data

RF CHARACTERISTICS Receiver principle. True diversity Frequency ranges. : MHz L N: MHz P: MHz Switching bandwidth. Up to 184 MHz Receiving frequencies. frequency banks, each with up to 59 factory-preset 6 channels, 1 frequency bank with up to 60 freely tunable channels (in 5 kHz steps) Frequency stability. 2.5 ppm Sensitivity. yp. 1.5 V for 52 dBA rms S/N (with HDP, peak deviation) t 15 V for 115 dBA rms S/N Adjacent channel rejection/ spacing typ. 5 dB / 400 kHz dB / 800 kHz Intermodulation attenuation. 80 dB Blocking. 80 dB Squelch. 13 steps (V) Antenna inputs. 2 BNC sockets (50 ) Daisy chain outputs. 2 BNC sockets (50 ) Gain. 0.5 dB 0.5 dB (ref. to antenna inputs) Continued on page 2
Variants EM 3731-II L, 470 - 638 MHz EM 3731-II N, 614 - 798 MHz EM 3731-II P, 776 - 960 MHz EM 3732-II L, 470 - 638 MHz EM 3732-II N, 614 - 798 MHz EM 3732-II P, 776 - 960 MHz EM 3732 COM-II L, 470 - 638 MHz EM 3732 COM-II N, 614 - 798 MHz EM 3732 COM-II P, 776 - 960 MHz Cat.No. 504073 Cat.No. 504074 Cat.No. 504075 Cat.No. 504076 Cat.No. 504077 Cat.No. 504078 Cat.No. 504079 Cat.No. 504080 Cat.No. 504081
Recommended Accessories AB 3700, broadband antenna booster AD 3700, directional antenna A 3700, omni-directional antenna GZL AES 10, AES3 cable Cat.No. 502196 Cat.No. 502197 Cat.No. 502195 Cat.No. 502432
AF CHARACTERISTICS Compander. Frequenze response. Nominal/peak deviation. Signal-to-noise ratio. THD. Latency. AF output voltage. (at peak deviation, 1 kHz AF). AF output sockets. Sennheiser HiDyn plus 40 20,000 Hz 40 kHz / 56 kHz 118 dB(A) (1 mV, peak deviation) 0.3% (at nominal deviation, 1 kHz) 1.9 ms + 18 dBu to 10 dBu, adjustable in 1 dB steps (transformer-balanced) 1 XLR-3 socket per receiver, 2 per EM 3732-II COM receiver Headphone output. x 100 mW at 32 , internal resist2 ance 10 , short-circuit-proof OVERALL DEVICE Power supply. V AC, 50 / 60 Hz Current consumption. Max. 0.4 A Power consumption. n: max. 20 W (50 VA) O Device off, booster supply voltage on: max. 9.5 W Device and booster supply voltage off: max. 4 W IEC mains connector. 3-pin; protection class I, as per IEC/EN 60320-1 Booster voltage. 12 V DC, 2 x max. 200 mA, short circuit-proof, can be switched off Ethernet. IEEE 802.3-2002, shielded RJ45 con nector with optional additional latch A Digitaloutput. ES3-2003, XLR-3, 44.1, 48, 88.2 or 96 kHz SR, 24 bit, externally synchronizable Word clock connection. BNC sockets (75 ), 2 daisy chain output Accepted sampling rates. 44.1, 48, 88.2 or 96 kHz Word clock input impedance. 75 , transformer-balanced, AC-coupled Input voltage range. 200 mV 5 Vpp Max. input voltage. 15 V (DC + AC) Word clock output impedance. 75 , transformer-balanced, AC-coupled Output voltage. 2.5 V 250 mV at 75 source impedance Dimensions. Approx. 436 x 215 x 44 mm (excl. rack mount ears) A Weight. pprox. 3,600 g (excl. rack mount ears) Approx. 4,080 g (incl. rack mount ears) OPERATING CONDITIONS Ambient temperature. -10 C to +55 C M Relative humidity. ax. 85% at 40C (non-condensing) Drip and splash water protection: The product may not be exposed to drip and splash water (IP 20)

EM 3731 EM 3732 EM 3732 Command

Instructions for use

PEAK 10

790.800 03.03 BANK CH

300 100

AF COM

Contents
Important safety instructions... 2 Delivery includes... 4 The EM 3731/3732 receiver family... 5 The frequency bank system... 5 Overview of operating controls... 7 Overview of the display... 8 Brightness control.... 8 Indications and displays... 9 Reception display... 9 Status display.... 10 Putting the receiver into operation... 13 Fitting the device feet... 13 Rack mounting... 13 Connecting the antennas.... 14 Daisy chaining up to eight twin receivers.. 16 Connecting the receiver to the mains/disconnecting the receiver from the mains... 17 Connecting the amplifier/mixing console.. 17 Connecting devices with AES3 digital input.. 17 Connecting an external word clock generator.. 18 Connecting the receivers to a PC via Ethernet... 18 Using the receiver.... 19 Switching the receiver on/off... 19 Connecting the headphones/adjusting the volume. 20 Deactivating the lock mode... 20 Synchronizing the transmitter with the receiver frequency.. 21 The operating menu... Overview of menus... Working with the operating menu... Operating menu of the receivers... Adjustment tips for the operating menu.. 28
Additional information... 38 HiDyn plus (HDP) noise reduction... 38 Squelch.... 38 Diversity reception.... 39 If a problem occurs.... 40 Specifications.... 41 Accessories/spare parts... 43 Manufacturer Declarations... 44
Thank you for choosing Sennheiser! We have designed this product to give you reliable operation over many years. Over 60 years of accumulated expertise in the design and manufacture of high-quality electro-acoustic equipment have made Sennheiser a world-leading company in this field. Please take a few moments to read these instructions carefully, as we want you to enjoy your new Sennheiser products quickly and to the fullest.
Important safety instructions
1. 2. 3. 4. 5. 6. 7. 8. 9. Read these instructions. Keep these instructions. Heed all warnings. Follow all instructions. Do not use this apparatus near water. Clean only with dry cloth. Do not block any ventilation openings. Install in accordance with the manufacturers instructions. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.
10. Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and the point where they exit from the apparatus. 11. Only use attachments/accessories specified by the manufacturer. 12. Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over. 13. Unplug this apparatus during lightning storms or when unused for long periods of time. 14. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, when the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped. 15. To completely disconnect this apparatus from the AC mains, disconnect the power supply cord plug from the AC receptacle. 16. WARNING: To reduce the risk of fire or electric-shock, do not expose this apparatus to rain or moisture. 17. Do not expose this equipment to dripping or splashing and ensure that no objects filled with liquids, such as vases, are placed on the equipment. 18. The mains plug of the power supply cord shall remain readily operable.

*) The audio outputs marked with the number 1 output the audio signal of the left receiver of the twin receiver (as viewed from the front); the audio outputs marked with the number 2 output the audio signal of the right receiver.

Overview of the display

Reception display RF level display RF for antenna A Diversity display (antenna A or antenna B active) RF level display RF for antenna B Audio level display Dev Display of the squelch threshold For additional information see pages 9 and 10. Status display Frequency display MHz appears when the frequency is displayed 6-step transmitter battery status display Command display (status display of the audio outputs AF and COM) (EM 3732 Command twin receiver only) Display for the current frequency bank and channel or the name For additional information see pages 10 and 11.

Brightness control

The display has an automatic brightness control. The brightness is dimmed after the last key stroke. With each new button press, the display lights up with full brightness. Triggers for dimming No service Squelch not reached after 60 s 20 min Behavior of the display Display is slightly dimmed Display turned off

Indications and displays

The displays provide information on the operating states of the corresponding receiver and those of the received transmitter.

Reception display

The reception display is permanently displayed. If you do not press a button on the transmitter, the display will dim after 60 seconds (see page 8). RF level display RF for the antennas
The left bargraph shows the strength of the received RF signal for antenna A; the right bargraph shows the strength of the received RF signal for antenna B.
When the RF signal of the received transmitter is too weak on both antennas: the text Mute flashes in alternation with the status display, the warning triangle for indicating error states 5 lights up red, the receiver is automatically muted to suppress hissing noise. Display of the squelch threshold
The top edge of the rastered area shows the adjusted squelch threshold. The squelch threshold can be adjusted in the Squelch menu (see Adjusting the squelch threshold on page 30). If the squelch threshold is not reached for 20 minutes, the display dims. (see page 8).

Diversity display

The receivers operate on the true diversity principle (see Diversity reception on page 39). The diversity display indicates whether diversity section A (i.e. antenna A) or diversity section B (i.e. antenna B) is active. The letter of the active diversity section appears backlit.

Connecting the amplifier/mixing console
The receiver has transformer balanced audio outputs. Connect the amplifier/mixing console to the XLR-3 socket AF out 1 M (left receiver) or to the XLR-3 socket AF out 2 K (right receiver). Via the operating menu of the corresponding receiver, adjust the level of the audio output to the input of the amplifier or mixing console (see Adjusting the audio output level on page 31).
Connecting devices with AES3 digital input
The digital balanced XLR-3M audio output G outputs the signals of both receivers in AES3 format. Use a special double-shielded 110 AES3 cable to connect the device with AES3 digital input to the digital balanced XLR-3M audio output G. This ensures that the digital data transmission interferes with the RF reception. Note: A ready-made AES3 cable from Sennheiser is available as an accessory with a length of 10 m (see Accessories/spare parts on page 43). Via the Clock menu, select the desired sampling rate (see Selecting the sampling rate for digitalization on page 31).
Connecting an external word clock generator
The receiver can digitalize the audio signal and output it via the digital balanced XLR-3M audio output G. The built-in A/D converter supports sampling rates of 44.1 kHz, 48 kHz, 88.2 kHz and 96 kHz. If you want to connect an external word clock generator instead, proceed as follows: Use a shielded 75 coaxial BNC cable to connect the external word clock generator to the BNC socket H. Select Ext. in the Clock menu (see Selecting the sampling rate for digitalization on page 31). The display for external word clock synchronization B: lights up permanently when the digital audio output of the receiver is synchronized with the external word clock generator, flashes when Ext. is selected in the Clock menu but no external word clock generator is connected, flashes when the signal of the external word clock generator is available but has not synchronized the digital audio output of the receiver is off when the receivers internal word clock generator is used. Notes: Both receivers of a twin receiver use the same word clock signal. The receiver has a BNC socket for word clock daisy chain output I for supplying the word clock signal to further daisy chained receivers using the supplied BNC word clock daisy chain cable. The word clock signal is also daisy chained when a receiver is switched off.

Connecting the receivers to a PC via Ethernet
The receivers can be centrally configured and monitored via a PC and the supplied Wireless Systems Manager software. Additionally, you can update the firmware in the receivers. To connect the receivers to a PC: Note: If you want to connect several receivers to the same Ethernet socket of your network, you require a standard 100Base-T Ethernet switch. Connect the supplied RJ 45 Ethernet cable to the RJ 45 socket for LAN connection F and to your switch or network. Install the Wireless Systems Manager software on your PC. Continue as described in the instruction manual of the Wireless Systems Manager software. The LED for LAN data transmission E lights up when data is transmitted.

Using the receiver

Scanning
When you are working with the Wireless Systems Manager software, you can use the Spectrum Analyzer tool to perform a continuous frequency scan. The Spectrum Analyzer tool uses the receiver that you select to check the relevant frequency range for signals and records the corresponding measured values. For detailed information, please refer to the chapter The RF Spectrum Analyzer tool of the Wireless Systems Manager manual. When selecting this receiver in the Spectrum Analyzer, please note that during the frequency scan: you cannot use the selected receiver for its normal purpose, the text Scanning is displayed and the receiver is automatically muted.
Switching the receiver on/off
The EM 3731 single receiver is switched on and off with the -button C. The two receivers of the EM 3732 or EM 3732 Command twin receiver are commonly switched on and off with the -button C. The -button C is not a mains switch. Note: If you only want to use one of the two receivers of the EM 3732 or EM 3732 Command, you can set the second receiver to standby mode (see Setting a receiver to standby mode on page 37). To switch the receiver on: Press the -button C. The display shows the product name (e.g. EM 3731) and the serial number of the current firmware behind Software. The status display appears after several seconds. To switch the receiver off: Press the -button C for approx 2 seconds until the display goes off. The receiver is switched off but daisy chained signals continue to be output. This means that: the daisy chain outputs Q and P output the antenna signals, if the booster supply voltage is switched on (see page 30), it remains switched on, the signal of the external word clock generator is looped through to the word clock daisy chain output I.

0.800.03 BANK CH

sync esc
Connecting the headphones/adjusting the volume
CAUTION! Danger of hearing damage! Listening at high volume levels for long periods can lead to permanent hearing defects. Set the volume for the connected headphones to the minimum before putting the headphones on. The EM 3731 single receiver features a headphone output 2. The two receivers of the EM 3732 or EM 3732 Command twin receiver have a common headphone output 2. This common headphone output 2 allows you to either monitor the audio signal of one receiver or to simultaneously monitor the audio signals of both receivers.
True Diversity Receiver EM 3732

790.80 03.03 B C

Set the headphone volume control 3 to the lowest volume by turning it to the left as far as possible. Connect headphones with a (6.3 mm) stereo jack plug to the headphone output 2.
To monitor the audio signals of one of the two receivers of a twin receiver:
Press the headphone button 0 of the receiver whose audio signals you want to monitor. To simultaneously monitor the audio signals of both receivers of a twin receiver: Simultaneously press the headphone buttons 0 of both receivers. The audio signals of the left receiver are output via the left headphone channel, the audio signals of the right receiver are output via the right headphone channel. Increase the volume gradually. To switch the headphone output off: Press the headphone button 0 of the receiver whose headphone output you want to switch off.
Deactivating the lock mode
When the receivers are remote controlled via a PC and the supplied Wireless Systems Manager software, their buttons can be locked via the Wireless Systems Manager software. To deactivate the lock mode: Press the esc button 6 until the progress bar is complete and the status display appears. The lock mode is deactivated and the settings can be made manually.

Hold esc to unlock

Synchronizing the transmitter with the receiver frequency
Via its infra-red interface, the receiver can transfer the frequency and the name to suitable transmitters (e.g. SK 5212, SKM 5200 or SKP 3000). Note: The transmitter must be from the same frequency range (A to I, see page 5) and be equipped with the same compander system (HDP, see page 38) as the receiver! Set the receiver to the desired receiving frequency (see Setting the receiving frequency on page 28 and Selecting a frequency bank and a channel on page 28) and enter the desired name (see Entering a name on page 29).

digital audio processing

sync esc sync
Press the sync button 9. The two blue LEDs in the infra-red interface (sync) A flash and the backlighting of the sync button 9 flashes red. The receiver is ready for synchronization. Position the transmitters infra-red interface at a max. distance of 5 cm in front of the infra-red interface (sync) A. The transfer starts automatically. During the transfer, the two blue LEDs in the infra-red interface (sync) A flash and the backlighting of the sync button 9 flashes green. After successful completion of the synchronization, the two blue LEDs in the infra-red interface (sync) A stop flashing and the sync button 9 is backlit in green. The receivers frequency and name are now also set on the transmitter and the transmission link is ready for operation. If an error occurred during synchronization (e.g. the transmitter is too far away from the receiver), the two blue LEDs in the infra-red interface (sync) A stop flashing and the sync button 9 is backlit in red. Note on the SKM 5200 hand-held transmitter: The infra-red interface of the SKM 5200 hand-held transmitter is located at the left-hand margin of the display. Position the transmitters infra-red interface precisely in front of the infra-red interface (sync) A of the receiver.

+,-|/0123456 789*;<=>A AB CDEFGHIJKLMN OPQRSTUVWXYZ
Select a different character by turning the jog dial 7. The selected character starts flashing.
Confirm the selected character by pressing the jog dial 7. The first character is accepted and stops flashing. The next character starts flashing. Repeat the last two steps to enter the remaining characters. After you have entered the six characters of the name, press the save button 8. The name is stored. The display changes to the selection mode of the operating menu. In order that the name is displayed on the status display, you may have to change the contents of status display (see Selecting the status display on page 36).
Adjusting the squelch threshold Squelch Both receivers are equipped with a squelch that can be adjusted via the Squelch menu. The squelch eliminates annoying noise when the transmitter is switched off. It also suppresses sudden noise when there is no longer sufficient transmitter power received by the receiver. The squelch can be adjusted in 13 steps from 0 to 30 V. Selecting a smaller value reduces the squelch threshold, selecting a higher value increases the squelch threshold. Adjust the squelch threshold with the transmitter switched off to the lowest possible value that suppresses hissing noise. Notes: If the squelch threshold is adjusted too high, the transmission range will be reduced. Therefore, always adjust the squelch threshold to the lowest possible setting. If you adjust the squelch threshold to 0, the squelch is switched off. If no RF signal is being received, hissing noise will occur. This setting is for test purposes only. To adjust the squelch threshold: Before adjusting the squelch threshold to a different setting, set the volume on a connected amplifier to the minimum.
Change to the setting mode of the Squelch menu. The current setting starts flashing.
Change the squelch threshold by turning the jog dial 7. The new setting becomes effective immediately.
After you have adjusted the desired squelch threshold, press the save button 8. The squelch threshold is stored. The display changes to the selection mode of the operating menu. Switching the booster supply voltage on/off
If you connect antenna boosters (e.g. AB 3700) or active antennas (e.g. A 3700, AD 3700), select Booster Feed On in the Booster menu so that the LEDs N and S light up; if you do not connect antenna boosters or active antennas, select Booster Feed Off in the Booster menu so that the LEDs N and S do not light up. Notes: The booster supply voltage is short-circuit proof. If you connect active antennas or antenna boosters, the current consumption of the overall device is increased. If the booster supply voltage is switched on, it remains switched on even when the receiver is switched off. Change to the setting mode of the Booster menu. The current setting starts flashing.

Turn the jog dial 7 until the arrow points to Scan new. Press the jog dial 7 to start the scan. The receiver scans the frequency banks one after the other for free channels. This can take several minutes. After the scan, a table displays the number of free channels for each frequency bank and the green backlighting of the save button 8 flashes. Note: You can cancel the scan at any time by pressing the esc button 6. The display changes to the setting mode of the Scan menu and the last scan result is restored. Turn the jog dial 7 to select a frequency bank with a sufficient number of free channels. Press the save button 8. The selected frequency bank is automatically called up in the B.Ch menu. Select a channel from this frequency bank (see Selecting a frequency bank and a channel on page 28). Note: After the scan, the channels that are occupied or subject to interference are marked with a warning triangle and the text Freq. occupied in the Tune menu.
Releasing channels that are used or subject to interference Scan reset After the scan, the channels that are occupied or subject to interference are marked with a warning triangle and the text Freq. occupied in the Tune menu. Via the Scan reset menu, you can unmark these channels. The last scan result is deleted. Turn the jog dial 7 until the arrow points to Scan reset.
Press the jog dial 7. The number of free channels is reset to the maximum for all frequency banks. Turn the jog dial 7 to select a frequency bank.
Press the save button 8. The selected frequency bank is automatically called up in the B.Ch menu.
Multi-channel operation Combined with Sennheiser 3000 and 5000 series transmitters, the receivers can form transmission links that are suitable for multi-channel operation. CAUTION! Risk of reception interference! If within the receivers frequency range transmitters transmit on channels from different frequency banks, reception can be subject to interference and inter-modulation. Only the factory-preset frequencies within the frequency banks 1 to 6 are interference and inter-modulation free. Set all transmitters of a multi-channel system to different channels within the same frequency bank. Before putting the transmission links into operation, we recommend that you perform a scan in order to find a frequency bank with a sufficient number of free channels: Switch all transmitters off. Use a receiver to scan all frequency banks for free channels (see Scanning the frequency banks for interference-free channels on page 33). Select a frequency bank with a sufficient number of free channels (see Selecting a frequency bank and a channel on page 28). Set each transmitter/receiver pair in your multi-channel system to a different free channel within this frequency bank.
Selecting the status display Display Via the Display menu, you can select the status display: 1. Selectable status display Name displays the freely selectable name Contents of the display

790.800 NAME 790.800

Bank/Channel displays the frequency bank and the channel number Name/Command displays the freely selectable name and the command display (EM 3732 Command receiver only) Bank/Channel/Command displays the frequency bank, the channel number and the command display (EM 3732 Command receiver only)

BANK CH

BANK AF COM CH
Change to the setting mode of the Display menu. The current status display starts flashing.
Select one of the four status displays by turning the jog dial 7.
Press the save button 8. The selected status display becomes effective. The display changes to the selection mode of the operating menu.
Changing the IP address IP-Addr Via the IP-Addr menu, you can display and change the receivers IP address. The IP address consists of four bytes and each byte consists of up to three digits (from 0 to 255). The receiver is factory-preset to dynamic IP addressing (Auto). To manually assign an IP address: Change to the setting mode of the IP-Addr menu. The first byte starts flashing.

192. 049 049. 068. 068

Select a value between 0 and 255 by turning the jog dial 7.
Press the jog dial 7 to confirm the first byte and change to the next byte. Repeat the last two steps to select all four bytes. After you have selected the complete IP address, press the save button 8. Switch the receiver off and on again (see Switching the receiver on/ off on page 19). The new IP address becomes effective.
To automatically obtain an IP address (dynamic IP addressing): Change to the setting mode of the IP-Addr menu. The first byte starts flashing. Press the jog dial 7 several times until the arrow points to Auto. Press the save button 8. Switch the receiver off and on again (see Switching the receiver on/ off on page 19). The new IP address becomes effective. Displaying the network address (MAC address) MAC Via the MAC menu, you can display the Media Access Control (MAC) address of the Ethernet interface. The MAC address is fixedly stored in each receiver and cannot be changed. Change to the setting mode of the MAC menu. The 12-digit MAC address is displayed.

00:1B:66:00:00:01

Setting a receiver to standby mode Standby You can set a receiver to standby mode and mute it. To do so, proceed as follows: Change to the setting mode of the Standby menu. The icon and the green backlighting of the save button 8 flash.

Press the save button 8. The esc button 6 is backlit in red. The receiver is set to standby mode and the display is switched off. Note: The standby mode remains active even when you switch the receiver off and on again. To end the standby mode: Press the jog dial 7 or the esc button 6. The display is switched on. Loading the factory-preset default settings
Via the Reset menu, you can reset the current settings to the factorypreset default settings. Change to the setting mode of the Reset menu. The question Reset to factory defaults? appears. The green backlighting of the save button 8 flashes. Press the save button 8 until the progress bar is complete. The factory-preset default settings are loaded. The display changes to the selection mode of the operating menu.

Additional information

HiDyn plus (HDP) noise reduction

RF link

Inherent noise of the RF link

Transmitter

Receiver
The EM 3731/3732 receivers are equipped with HDP, the Sennheiser noise reduction system that reduces RF interference. It increases the signal-tonoise ratio in wireless audio transmission to more than 110 dB. HDP is a wideband compander system which compresses the audio signal in the transmitter in a 2:1 ratio (related to dB) to lift it above the inherent noise floor of the RF link. In the receiver the signal is expanded in an identical and opposite way in a 1:2 ratio to restore the original signal, at the same time reducing the RF noise to below the noise floor of the receiver. HDP has been specially developed for high quality radiomicrophone systems. The EM3731/3732 receivers feature a AES3 digital audio output for digital mixing consoles. In the receiver the audio signal is digitalized as early as possible so that the noise reduction (compander) can be realized digitally. Note: Only transmitters and receivers that are equipped with HDP can work correctly with each other. If non HDP equipment was mixed with HDP, the dynamic range would be drastically reduced and the transmission would sound blunt and flat. HDP is permanently active and cannot be switched off.

Depending on the strength of the received RF signal, the receivers audio output is opened or muted. Via the Squelch menu, the squelch threshold can be adjusted in 15 steps from 0 to 30 V.

Diversity reception

The receivers operate on the true diversity principle: A receiving antenna receives not only the electromagnetic waves which reach it by a direct path, but also the reflections of these waves which are created in the room by walls, windows, ceilings and fittings. When these waves are superimposed, destructive interference occurs, which can also be called field strength gaps. Repositioning the receiving antenna can bring a solution. With mobile transmitters, however (which all radiomicrophones are), the field strength gap will then occur with a different transmitter position. These field strength gaps can only be eliminated with true diversity receivers. In true diversity, instead of one antenna and one receiver there are now two antennas and two receiver sections. The antennas are spatially separated. By means of a comparison circuit, the receiver section with the strongest RF signal is always switched to the common AF output. The risk of the occurrence of field strength gaps in both antennas at the same time is virtually nonexistant. The receiver display panel shows the active diversity section (A or B) (see Diversity display on page 9).

Receiver section A

Receiver section B

If a problem occurs.

Problem No operation indication Possible cause No mains connection Transmitter and receiver are not on the same channel Possible solution Check the connections of the mains cable Set transmitter and receiver to the same channel (see Selecting a frequency bank and a channel on page 28 and Synchronizing the transmitter with the receiver frequency on page 21) Reduce the distance between transmitter and receiver
No RF signal The transmitter is out of range
Check the squelch threshold setting (see page 30) The transmitter is not within the range Place the transmitter at a distance of of the infra-red interface approx. 5 cm in front of the infra-red interface (see page 21) It is not possible to The infra-red interface of the receiver is Press the esc button 6 to stop the scan transfer the not yet ready for transferring the frequency to the frequency; the receiver is still in scan transmitter mode The transmitter is from a different Use a transmitter that matches the frequency range frequency range of the receiver The transmitter sensitivity is adjusted Adjust the transmitter sensitivity correctly The audio signal has a too low high level of The receivers AF output level is See Adjusting the audio output level on background noise adjusted too low page 31 The transmitter sensitivity is adjusted Adjust the transmitter sensitivity correctly too high The audio signal is distorted The receivers AF output level is See Adjusting the audio output level on adjusted too high page 31 The display does not The receiver is in standby mode Press the jog dial 7 (see Setting a switch on receiver to standby mode on page 37) Mute is One of the two receivers is not used or Set the receiver to standby mode permanently the transmitter is swiched off or out of (see page 37) displayed range If a problem occurs that is not listed in the above table or if the problem cannot be solved with the proposed solution(s), please contact your local Sennheiser agent for assistance.

Specifications

RF characteristics Modulation Frequency ranges wideband FM 470560 MHz 518608 MHz 548638 MHz 614704 MHz 678768 MHz 708798 MHz 776866 MHz 814904 MHz 870960 MHz 6 frequency banks with up to 60 factory-preset frequencies each, 1 frequency bank with up to 60 freely selectable frequencies (tunable in 5-kHz increments) 90 MHz 2.5 ppm true diversity typ. 1.5 V at 52 dB(A)rms S/N typ. 15 V at 115 dB(A)rms S/N typ. 75 dB/400 kHz typ. 80 dB/800 kHz 80 dB 80 dB 13 steps (V) 2 BNC sockets (50 ) 2 BNC sockets (50 ) amplification: 0 dB 0.5 dB (related to the antenna inputs) 180 MHz typ. bandwidth (range)
Receiving frequencies (per receiver RX 1 or RX 2) Switching bandwidth Frequency stability Receiver principle Sensitivity (with HDP, peak deviation) Adjacent channel rejection/ spacing Intermodulation attenuation Blocking Squelch Antenna inputs Daisy chain outputs
AF characteristics Compander system Latency Nominal/peak deviation Signal-to-noise ratio (1 mV, peak deviation) Sennheiser HiDyn plus, DSP-emulated 1.9 ms 40 kHz/56 kHz 118 dB(A) at +18 dBu/+4 dBu(AF out)
THD (nominal deviation, 1 kHz) 0.3 % AF output voltage (peak deviation, 1 kHzAF) AF output sockets Headphone output +18 dBu to 10 dBu, adjustable in 1-dB increments (transformer balanced) 1 XLR-3 socket per receiver, 2 XLR-3 sockets per EM 3732 Command receiver 2 x 100 mW at internal impedance short-circuit proof
Overall device Ambient temperature Relative humidity Power supply Current consumption Power consumption 10 C to +55 C max. 85 % 100240 V AC, 50/60 Hz max. 0.4 A with receiver switched off: max. 20 W (50 VA) with receiver switched off, booster supply voltage switched on: max. 9.5 W with receiver and booster supply voltage switched off: max. 4 W 3-pin, protection class I, as per IEC/EN 60320-x 215 x 44 (without rack mount ears) approx. 4080 g (incl. rack mount ears) approx. 3600 g (without rack mount ears) 12 V DC via antenna socket max. 200 mA each, short-circuit proof, switchable IEEE 802.3-2002, shielded RJ 45 socket with optional locking facility AES3-2003, XLR-3, 44.1, 48, 88.2 or 96 kHz SR, 24 bits, externally synchronizable 2 BNC sockets (75 ), daisy chain output 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz 75 , transformer balanced, AC-coupled input voltage range 200 mV 5 Vpp max. input voltage 15 V (DC + AC) 75 , transformer balanced, AC-coupled output voltage 2.5 V 250 mV at 75 source impedance EMC Radio Safety 47 CFR 15 Industry Canada EN 301489-1/-9 EN 300422-1/-2 EN 60065 subpart B RSS 210, IC: 2099A-EM 373x
Mains connector Dimensions W x D x H [mm] Weight Booster supply Ethernet Digital output Word clock connection Accepted sampling rates Word clock input impedance
Word clock output impedance In compliance with

Type approval

Accessories/spare parts
The following accessories are available from your authorized dealer: Cat. No. 009408 Accessory A 3700 active broadband antenna AD 3700 active broadband directional antennna AB 3700 antenna booster A 5000 CP circularly polarized broadband antenna A 1031 broadband remote antenna A 2003 broadband directional antenna ASA 3000-EU antenna splitter ASA 3000-US antenna splitter ASA 3000-UK antenna splitter Cat. No. 087972 Accessory GA 3030 AM antenna mount Antenna daisy chain cable, 50 , BNC, 0.25 m Word clock daisy chain cable, 75 , BNC, 0.25 m GZL AES 10 AES3 cable, 10 m, 110 , double-shielded GZL 1019-A1 coaxial cable, type RG 58, BNC to BNC, 1 m GZL 1019-A5 coaxial cable, type RG 58, BNC to BNC, 5 m GZL 1019-A10 coaxial cable, type RG 58, BNC to BNC, 10 m

Manufacturer Declarations

Warranty regulations

The guarantee period for this Sennheiser product is 24 months from the date of purchase. Excluded are accessory items, rechargeable or disposable batteries that are delivered with the product; due to their characteristics these products have a shorter service life that is principally dependent on the individual frequency of use. The guarantee period starts from the date of original purchase. For this reason, we recommend that the sales receipt be retained as proof of purchase. Without this proof (which is checked by the responsible Sennheiser service partner) you will not be reimbursed for any repairs that are carried out. Depending on our choice, guarantee service comprises, free of charge, the removal of material and manufacturing defects through repair or replacement of either individual parts or the entire device. Inappropriate usage (e.g. operating faults, mechanical damages, incorrect operating voltage), wear and tear, force majeure and defects which were known at the time of purchase are excluded from guarantee claims. The guarantee is void if the product is manipulated by nonauthorised persons or repair stations. In the case of a claim under the terms of this guarantee, send the device, including accessories and sales receipt, to the responsible service partner. To minimise the risk of transport damage, we recommend that the original packaging is used. Your legal rights against the seller, resulting from the contract of sale, are not affected by this guarantee. The guarantee can be claimed in all countries outside the U.S. provided that no national law limits our terms of guarantee.
CE Declaration of Conformity
This equipment is in compliance with the essential requirements and other relevant provisions of Directives 1999/5/EC and 2006/95/EC. The declaration is available on the internet site at www.sennheiser.com. Before putting the device into operation, please observe the respective countryspecific regulations!