POWER AMPLIFIER

XM6150 XM4220

Owners Manual

Introduction
Thank you for purchasing a Yamaha 6150, or 4220 XM Series Power Amplifier. The XM Series of power amplifiers was developed from Yamahas wealth of experience in building PA equipment and its tradition of careful attention to every detail of circuit design. These power amplifiers feature high power and superb quality together with superior reliability and stability, guaranteeing the highest possible audio performance. Main features include Six amplifiers (four on the 4220) that can be used independently or in stereo pairs. Channel pairs can also be bridged. Balanced XLR and Euroblock connector inputs, 5-way binding post outputs. Each channel features a switchable HPF, which filters frequencies below 80 Hz, a detented attenuator, and SIGNAL and CLIP indicators. The input signal connected to channel A can easily be fed to the other channels using the CH A TO ALL CH switch. Protection includes power on/off muting, DC detection, temperature, and protection indicator. Variable-speed, low-noise cooling fan system ensures high reliability even under the most demanding conditions. This Owners Manual applies to the XM6150 6CH and XM4220 4CH power amplifier. In order to take full advantage of your power amplifier and enjoy long and trouble-free operation, please read this Owners Manual carefully before using your XM Series Power Amplifier.
WARNING: THIS APPARATUS MUST BE EARTHED

IMPORTANT

THE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING CODE: GREEN-AND-YELLOW : BLUE : BROWN : EARTH NEUTRAL LIVE
As the colours of the wires in the mains lead of this apparatus may not correspond with the coloured markings identifying the terminals in your plug, proceed as follows: The wire which is coloured GREEN and YELLOW must be connected to the terminal in the plug which is marked by the letter E or by the safety earth symbol or coloured GREEN and YELLOW. The wire which is coloured BLUE must be connected to the terminal which is marked with the letter N or coloured BLACK. The wire which is coloured BROWN must be connected to the terminal which is marked with the letter L or coloured RED. * This applies only to products distributed by YAMAHA KEMBLE MUSIC (U.K.) LTD.

Precautions

Warnings
Do not allow water to enter this unit or allow the unit to become wet. Fire or electrical shock may result. Connect this units power cord only to an AC outlet of the type stated in this Owners Manual or as marked on the unit. Failure to do so is a fire and electrical shock hazard. Do not scratch, bend, twist, pull, or heat the power cord. A damaged power cord is a fire and electrical shock hazard. Do not place heavy objects, including this unit, on top of the power cord. A damaged power cord is a fire and electrical shock hazard. In particular, be careful not to place heavy objects on a power cord covered by a carpet. If you notice any abnormality, such as smoke, odor, or noise, or if a foreign object or liquid gets inside the unit, turn it off immediately. Remove the power cord from the AC outlet. Consult your dealer for repair. Using the unit in this condition is a fire and electrical shock hazard. Should this unit/AC adapter/power supply be dropped or the cabinet be damaged, turn the power switch off, remove the power plug from the AC outlet, and contact your dealer. If you continue using the unit without heeding this instruction, fire or electrical shock may result. If the power cord is damaged (i.e., cut or a bare wire is exposed), ask your dealer for a replacement. Using the unit with a damaged power cord is a fire and electrical shock hazard. Do not remove the units cover. You could receive an electrical shock. If you think internal inspection, maintenance, or repair is necessary, contact your dealer. Do not modify the unit. Doing so is a fire and electrical shock hazard.

Cautions

When rack-mounting the unit, allow enough free space around the unit for normal ventilation. This should be: 10 cm at the sides, 30 cm behind, and 20 cm above. For normal ventilation during use, remove the rear of the rack or open a ventilation hole. If the airflow is not adequate, the unit will heat up inside and may cause a fire. To mount several of these units in an EIA-compliant rack, refer to the rack mounting instructions on page 8. This unit has ventilation holes at the (top, bottom, front, rear, and sides) to prevent the internal temperature rising too high. Do not block them. Blocked ventilation holes are a fire hazard. Clean the contacts of the phone plug before connecting it to the SPEAKERS jack of this unit. Dirty contacts may generate heat. Use only speaker cables when connecting speakers to amplifier outputs. Using other types of cables is a fire hazard. Hold the power cord plug when disconnecting it from an AC outlet. Never pull the cord. A damaged power cord is a potential fire and electrical shock hazard. Do not touch the power plug with wet hands. Doing so is a potential electrical shock hazard. Do not use this amplifier for any purpose other than driving loudspeakers.

Using a mobile telephone near this unit may induce noise. If noise occurs, use the telephone away from the unit. XLR-type connectors are wired as follows: pin 1: ground, pin 2: hot (+), and pin 3: cold ().

Contents

Controls and Functions.. 4 Front Panel... 4 Rear Panel... 5 Connection... 7 Using a Euroblock connector. 7 Speaker Connection.. 7 Air Flow... 8 Rack Mounting... 8 Specifications.. 9 General Specifications... 9 Block Diagram... 10 Dimensions... 11 Troubleshooting.. 12

Controls and Functions

s Front Panel
* The illustration shows model XM6150.
1 POWER switch and indicator
This is the main POWER switch. Press to turn on the amplifier. Press it again to turn off. The POWER indicator lights up when the amplifier it turned on.

3 CLIP indicator

A channels CLIP indicator lights up when its output distortion exceeds 1% (i.e., clipping). Output signal clipping is typically caused by excessive input signal levels.

2 PROTECTION indicator

When the protection system is active, the PROTECTION indicator lights up and the speakers are automatically disconnected from the amplifiers outputs. The protection system activates in the following situations: When the amplifier is turned on The protection system activates for approximately three seconds when the amplifier is turned on. After three seconds, the protection system deactivates automatically and the amplifier is ready for normal operation. If a DC voltage is detected at the amplifiers outputs The protection system activates if a DC voltage is detected at the amplifiers outputs. Once the DC voltage problem is corrected, the protection system deactivates automatically and the amplifier is ready for normal operation. If the amplifier overheats If the amplifier overheats, the protection system activates. In this case, you should turn off the amplifier and allow it time to cool down. When it has cooled down, the protection system deactivates automatically and the amplifier can be turned on again ready for normal operation. See the Precautions section of this Owners Manual for ways to prevent the amplifier overheating.

4 SIGNAL indicator

A channels SIGNAL indicator lights up when its output exceeds 2 V rms, which is equivalent to 1/2 watt into 8 ohms, or 1 watt into 4 ohms.

s Rear Panel

1 HPF switches
These switches are used to turn on and off the HPF (High Pass Filter) for each channel. When set to ON, frequencies below 80 Hz are filtered using a 12 dB/ octave high pass filter. Turn this switch ON if 70V-line, high-impedance speakers are connected.
In Bridge mode, only the HPF switch of the first channel in the pair is active, i.e., channel A of pair A B, channel C of pair CD, and channel E of pair EF (XM6150 only).

4 Euroblock connectors

These balanced Euroblock connectors are used to connect input signals.
In Bridge mode, only the Euroblock connector of the first channel in the pair is active, i.e., channel A of pair AB, channel C of pair CD, and channel E of pair E F (XM6150 only).

5 CH A TO ALL CH switch

This switch is used to feed the input signal connected to channel A to all channels. When set to EACH CH, the input signal connected to each channel is amplified and output by each channel respectively. When set to CH A TO ALL CH, however, the input signal connected to channel A is fed to all channels.

2 Attenuators

These detented controls are used to attenuate the input signal from dB to 0 dB for each channel.
In Bridge mode, only the attenuator of the first channel in the pair is active, i.e., channel A of pair AB, channel C of pair CD, and channel E of pair EF (XM6150 only).

6 BRIDGE switches

These switches are used to bridge the following channel pairs: AB, CD, and EF (XM6150 only). When set to OFF, the two channels operate independently. For example, the signal connected to input channel A is amplified and output by the channel A outputs, while the signal connected to input channel B is amplified and output by the channel B outputs. When set to BRIDGE, the signal connected to input channel A is amplified and output by the bridged outputs AB, and channel Bs inputs are not used.

3 XLR inputs

These balanced XLR-3-31 type connectors are used to connect input signals. They are wired pin 1ground, pin 2hot (+), and pin 3cold ().

Hot Ground Cold

In Bridge mode, only the XLR input of the first channel in the pair is active, i.e., channel A of pair AB, channel C of pair CD, and channel E of pair EF (XM6150 only).

7 GND terminals

This is the grounding screw terminal. If hum or noise occurs, ground (earth) the unit via this jack, or try connecting it to the chassis of the mixer or preamp, etc.

8 Speaker outputs

These 5-way binding posts are used to connector speakers. The following illustrations show how speakers should be connected for normal and Bridge mode operation. Normal mode Bridge mode

Speaker min. 4

Speaker min. 8
In Bridge mode, you can connect multiple highimpedance speakers (that are compatible with 70V line output) in parallel. The number of speakers you can connect is determined by the rated input of each speaker. For each channel, you can connect speakers as long as the speakers total rated input does not exceed 150W (for XM6150) or 350W (for XM4220).
Total rated input 150W or less (XM6150) 350W or less (XM4220)
Note: Be sure to use speakers that support the 70V line-out voltage.

Connection

s Using a Euroblock connector
1. If the wire insertion ports are closed, turn the screws on top of the connector counterclockwise to open the ports. 2. Insert the wires into the appropriate ports, following the indication of the pole on the input terminal, turn the screws on top of the connector clockwise to fix the wires. 3. Attach the Euroblock connector to the input terminal on the unit.

s Speaker Connection

1. Turn off the POWER switch. 2. Remove the cover attachment screws and remove the protective cover from the speaker terminals.
Use a screwdriver to fix the wires.
After removing approx. 15 mm of insulation from the ends of the speaker cables, pass the bare ends of the speaker wires through the holes in the corresponding speaker terminals and tighten the terminals to securely clamp the wires. Refer to page 6 for speaker porality.

* Shown actual size.

At this time make sure that the bare ends of the speaker cables do not extend from the terminals in such a way that they touch the chassis.
Wire should not touch the chassis.
4. Reattach the protective cover over the speaker terminals.

Air Flow

This unit uses a forced cooling system in which air comes in through the front opening and goes out the sides and rear.

Side View

Rear View

Air intake

Air exhaust

Rack Mounting

If multiple high-power amp units are mounted in a rack with poor ventilation, the heat from the amps will cause the interior of the amp to become very hot, causing the performance of the amps to be impaired. In particular, when mounting in a rack whose back can not be left open, mount according to the following instructions. Rack: Leave a gap of 10 cm or more between the rear panel of the rack and the rear panel of the amplifier. Fan: Use a fan with 1.5 m3/min or more maximum wind and 5 mmH2O or more maximum static pressure. Mounting: Install the fan kit on the top slot or the top panel of the rack and install a blanking panel between two amps. Ventilation panel:. The ventilation panel should be a 1U size, and more than 35% of the entire area should be open. Example of mounting The figure on the left below shows an example of a fan kit (panels and two fans) on the top slot of the rack. The fans are Minebia 3115PS-12T-B30 (with 0.9 m3/min maximum wind and 5 mmH2O maximum static pressure). The figure on the right below is a dimensional diagram of a panel on which two 3115PS-12T-B30 are installed.

71.50.1

78 4C1 5

XM6150/4220

248 463

Ventilation panel

Unit : mm

Fan kit

Specifications

s General Specifications

XM6150 Power Output Level (Rated Power) 20 Hz~20 kHz THD+N= 0.2% 1 kHz THD+N= 0.2% 8/BRIDGE 8/BRIDGE 70.7V/BRIDGE Half Power 100 W x W x W x W x W x W x W x Hz~40 kHz (THD+N= 1%) 0.2% 8, Po= 1 W 0 dB, 0.5 dB, 1 dB 0.2% 60 dB 68 dB 100 dB dB 32.1 dB Front Panel Rear Panel 33.6 dB 30 k/Balanced, 15 k/Unbalanced POWER switch (ON/OFF) Volume (31 position) /ch BRIDGE switch (ON/OFF) /2ch HPFswitch (ON/OFF) /ch fc=80 Hz, 12 dB/oct. CH A TO ALL CH switch XLR-3-31 type/ch Euroblock connector 5-way binding posts Green Red Red Green POWER switch ON muting, DC detection, Temp. detection (heatsink temp 85C) RL 2 Low/~50C, Variable, High/70C~ US & Canada Europe Other Idling 1/8 output power, 4 Maximum output, V, 60 Hz 230 V, 50 Hz 240 V, 50 Hz 45 W 400 W/550 VA 1800 W 480 x 132 x 319 mm 18 kg Euroblock connector x kg Euroblock connector x W 400 W/500 VA 1800 W 66.5 dB 20 Hz~50 kHz XMW x W x W x W x W x W x W x 2

Power Bandwidth Total Harmonic Distortion (THD + N) 20 Hz~20 kHz, Half Power Frequency Response Intermodulation distortion (IMD) 60 Hz:7 kHz, 4:1, Half Power Channel Separation Residual Noise SN Ratio Damping Factor Voltage Gain (Vol. max.) Input Impedance Controls
Half Power, RL= 8, 1 kHz Vol. max., input 600 shunt 12.7 kHz LPF 12.7 kHz LPF 8, 1f= 1 kHz

Vol. max.

Sensitivity (Vol. max.) Rated Power into 8

Connectors

Input Output

Indicators

POWER PROTECTION CLIP SIGNAL
Protection Circuits PC limiter Fan Speed Power Requirements

Power Consumption

Dimensions (W x H x D) Weight Accesaries
0 dB=0.775 Vrms, Half Power=1/2 Power Output Level (Rated Power) Specifications subject to change without notice. For European Model Purchaser/User information specified in EN55103-1 and EN55103-2. Inrush Current: 56A Conformed Enviroment: E1, E2, E3 and E4.
Note: The block diagram indicated in the dotted frame ( ) applies only to model XM6150

s Block Diagram

s Dimensions

W: 480

H: 132

D: 319

Unit: mm

Troubleshooting

The following table lists the main causes of abnormal operation and the corrective measures required as well as the protective circuit operation in each case.

Indicator

Possible Cause There is a short at the amplifiers speaker outputs, the speakers inputs, or in the wiring. The impedance of the connected speaker is too low.

Remedy

Protection Circuit
Locate and remove the short. Use a speaker with a minimum impedance of 4 (8 in Bridge mode). Check the ventilation around the amplifier and improve the airflow if necessary. Consult your dealer or a Yamaha service center. The PC limiter circuit activates to protect the power transistors.

CLIP indicator lights up

The heat sink temperature has exceeded 90C. PROTECTION indicator lights up A DC voltage of 2 V or greater was detected in the amplifiers output circuit.

The thermal protection circuit activates to protect the power transistors. The output relay activates to protect the speaker system.

YAMAHA CORPORATION

V455890 RAP 16 NP Printed in Taiwan Pro Audio Division, #18/3 P.O. Box 3, Hamamatsu, 430-8651, Japan