INSTRUCTION MANUAL

MADE IN GERMANY by
Dear Customer, congratulations on your purchase of this high-quality HELIX amplifier, made in Germany. The new HELIX PRECISION series amplifiers highlights best quality, excellent manufacturing and state-of-the-art technology. After 24 years of experience in the research & development of audio products this amplifier generation sets new standards. The attractive typical HELIX design makes this amplifier an outstanding and top of the class product. We wish you many hours of enjoyment with your new HELIX amplifier. Yours AUDIOTEC FISCHER Team
General installation instructions To find out how HELIX amplifiers work best for you, read this manual carefully and follow the instructions for installation. We guarantee that this product has been checked for proper functioning before shipping. Before you start installation, disconnect the car battery at the minus pole. We would urge you to have the installation work carried out by a specialist as verification of correct installation and connection of the unit is a prerequisite for warranty cover of the HELIX amplifier. Install your amplifier at a dry location where there is sufficient air circulation to ensure adequate cooling of the equipment. For safety reasons, the amplifier must be secured in a professional manner. This is performed by means of four fixing screws screwed into a mounting surface offering sufficient retention and stability. Before drilling the holes for the screws, carefully examine the area around the installation position and make sure that there are no electrical cables or components, hydraulic brake lines or any part of the petrol tank located behind the mounting surface - otherwise these could be damaged. You should be aware of the fact that such components may also be concealed in the double-skin trim panels/mouldings. General instructions for connecting the amplifiers The HELIX amplifiers may only be installed in motor vehicles which have a 12-volt minus pole connected to the chassis ground. Any other system could cause damage to the amplifier and the electrical system of the vehicle. The plus cable from the battery for the complete system should be provided with a main fuse at a distance of max. 30 cm from the battery. The value of the fuse is calculated from the maximum total current input of the car audio system. Install the cabling in a manner which precludes any danger of the leads being exposed to shear, crushing or rupture forces. If there are sharp edges in the vicinity (e.g. holes in the bodywork) all cables must be cushioned and protected to prevent fraying. Never lay the power supply cables adjacent to leads and lines connecting other vehicle equipment (fan motors, fire detection modules, gas lines etc.). In order to ensure safe installation, use only high-quality connections and materials. Ask your dealer for high quality accessories.
1 Connecting the remote lead The remote lead is connected to the automatic antenna (aerial positive) output of the head unit (radio). This is only activated if the head unit is switched ON. Thus the amplifier is switched on and off with the head unit. 2 Connecting the battery cable Connect the +12 V power cable to the positive terminal of the battery. Recommended cross section: min. 16mm. 3 Connecting the ground cable The ground cable should be connected to a central ground reference point (this is located where the negative terminal of the battery is grounded at the metal body of the vehicle), or to a bright bare-metal location on the vehicle chassis, i.e. an area which has been cleaned of all paint residues. 4 Fuses The input fuses are connected in parallel and provide protection against an internal equipment fault, i.e. the system must be additionally protected by a further line fuse located in the vicinity of the battery (max. distance from battery: 30 cm). The fuse ratings are 3 x 25 amperes, and both must be installed as the amplifier protection rating is 75 amperes (3 x 25 A).
5 Fuse Function Indication If the fuses (4) are destroyed due to malfunction the red LED illuminates. In normal operation the LED turns off. 6 - 9 Signal input The A4 Competition has RCA connectors for RCA cables that can be connected with the pre-amplifier output of the line-outputs of the headunit or of a pre-amplifier i.g. HXE 100. This connectors are gold-plated to ensure a better signal transmission. 8 - 9 Level controls for input sensitivity These controls can be used to match the input sensitivity of the individual channels A and B to the output voltage of the connected head unit. These controls are not volume controls and are solely intended for the purpose of sensitivity trimming. The control range extends from 500 mV to 8 V. 10 - 12 CPS - Color Protection System This LEDs show the operation mode of the amplifier green (10) = in operation; yellow (11) = malfunction of the amplifier, short circuit at loudspeaker output; red (12) = overheating If the amplifier shuts off due to overheating it can take a while until it turns on again. This depends on the outside temperature. 5

ENGLISH

13 Switch for LP/BP, Linear and HP of channel A and B To switch the internal active crossover to Highpass/ Full Range (linear) or Lowpass. If this switch is set on Highpass the exact frequency can bet set with control No. 15. At switch position Lowpass/Bandpass the Highpass is always active. That means a Bandpass is built in any case. The Highpass is adjusted with control 15 and the Lowpass with control 16. Thus every desired Bandpass between 15 Hz and 6000 Hz can be adjusted. Caution! To avoid a lost of sound pressure make sure that the crossover frequencies of High- and Lowpass are separated of 2 octaves when building a Bandpass. That means: If the lowpass signal is adjusted to 320 Hz the highpass should be adjusted 2 octaves lower on approx. 80 Hz. (1 octave = double frequency or half frequency) If a subwoofer is connected we recommend to use highpass control 15 as variable subsonic filter or to turn control 15 counter-clockwise to 15 Hz to get a subsonic filter. 14 Stereo/Bridged/Mono switch To set the operating mode of the amplifier. Stereo: If the amplifier is operated in 2-channel mode the switch has to be set on stereo position and both inputs (6 and 7) must be used. Bridged: If the amplifier is operated in Mono mode the switch has to be set on BRIDGED-STEREO IN position. In this mode both channels work as one (Mono) channel. On position BRIDGED-STEREO IN both inputs A and B (6 and 7) must be used. Mono: As on position Bridged the amplifier operates in Mono mode were both channels works as one (Mono) channel. On the position Mono only the input A(6) must be used. This is neccessary if only Mono signal is available. Mono mode with mono signal: To operate the B2 as a mono amplifier with a mono signal for the bridged channels the switch has to be set to BRIDGED-MONO IN. In this mode both bridged channels work as one channel (mono). On position BRIDGED-MONO IN only one input A (6) must be used.
15 Control for Highpass To adjust the crossover frequency of both channels.

variable variabel

20 Connection of the integrated cooling fan Plug connection protected against wrong polarity to connect the integrated cooling fan. In case an external cooling fan is connected (terminal 21) this plug has to be disconnected and insulated to avoid damage inside the amplifier.
21 Connection of an external cooling fan In case an external cooling fan is connected please check correct polarity and make sure that 500 mA are not exeeded.
adjustable Highpass 15 Hz to 4 kHz 16 Control for Lowpass/Bandpass To adjust the crossover frequency of both channels.

2K 5K Hz

80C 50C
adjustable Lowpass 15 Hz to 4 Hz 17 Speaker connection terminals for channels A and B 18 Cooling fan On/Off control and adjustment of cooling fan start temperature To switch the cooling fan ON or OFF. In case the cooling fan is not used, set the switch to FAN OFF. In this position the cooling fan is not in operation. In case the cooling fan is used, the operation temperature can be chosen with this control. The temperature range starts at 40C and ends at 70C. 19 Control for temperature adjustment of maximum cooling fan speed To adjust the cooling fan speed (maximum power) to a defined temperature from 50 C to 80 C. Example: On control position 50C the cooling fan would operate at maximum power at this temperature.

1 Connecting the remote lead The remote lead is connected to the automatic antenna (aerial positive) output of the head unit (radio). This is only activated if the head unit is switched ON. Thus the amplifier is switched on and off with the head unit. 2 Connecting the battery cable Connect the +12 V power cable to the positive terminal of the battery. Recommended cross section: min. 16mm. 3 Connecting the ground cable The ground cable should be connected to a central ground reference point (this is located where the negative terminal of the battery is grounded at the metal body of the vehicle), or to a bright bare-metal location on the vehicle chassis, i.e. an area which has been cleaned of all paint residues.
4 Fuses The input fuses are connected in parallel and provide protection against an internal equipment fault, i.e. the system must be additionally protected by a further line fuse located in the vicinity of the battery (max. distance from battery: 30 cm). The fuse ratings are 3 x 25 amperes, and both must be installed as the amplifier protection rating is 75 amperes (3 x 25 A). 5 Fuse Function Indication If the fuses (4) are destroyed due to malfunction the red LED illuminates. In normal operation the LED turns off. 6 - 9 Signal input The B4 Precision has RCA connectors for RCA cables that can be connected with the pre-amplifier output of

Guaranty Regulations

10 - 13 Level controls for input sensitivity These controls can be used to match the input sensitivity of the individual channels - A to D - to the output voltage of the connected head unit. These controls are not volume controls and are solely intended for the purpose of sensitivity trimming. The control range extends from 500 mV to 8 V. 14 - 16 CPS - Color Protection System This LEDs show the operation mode of the amplifier green (14) = in operation; yellow (15) = malfunction of the amplifier, short circuit at loudspeaker output; red (16) = overheating. If the amplifier shuts off due to overheating it can take a while until it turns on again. This depends on the outside temperature. 17 Switch for HP/ Linear/ LP of channel A and B To switch over the internal active crossover to Highpass/Full range (linear) or Lowpass of channel A and B 18 Switch for HP/ Linear/ LP of channel C and D To switch over the internal active crossover to Highpass/Full range (linear) or Lowpass of channel C and D 19 - 20 Stereo/Bridged/Mono switch To set the operation mode of the amplifier. 4 channel mode: If the amplifier operates in 4-channel mode, the switches have to be set on stereo position (as is is ex works) and in each case both channels (6/7 for the channels A/B and 8 /9 for the channels C/D) must be used. 3- or 2-channel mode with stereo signal: If the amplifier is operated in 3- or 2-channel mode with one stereo signal for the bridged channels, set the switch of the channels to be bridged (A/B or C/D) to BRIDGEDSTEREO IN. In this mode both bridged channels are connected to one channel (mono). On position BRIDGED-STERO IN both inputs (6/7 for A and B or 8/9 for C and D) must be used. 3- or 2-channel mode with mono signal: If the amplifier is operated in 3- or 2-channel mode with a mono

21 - 22 Control for frequency range To adjust the crossover frequency of the stereo channels A and B (21) and C and D (22).
27 Connection of the integrated cooling fan Plug connection protected against wrong polarity to connect the integrated cooling fan. In case an external cooling fan is connected (terminal 28) this plug has to be disconnected and insulated to avoid damage inside the amplifier. 28 Connection of an external cooling fan In case an external cooling fan is connected please check correct polarity and make sure that 500 mA are not exeeded.
Due to the high quality standard Helix products achieved an excellent international reputation. Therefore we grant a warranty period of 2 years. The products checked and tested carefully during the entire production process. In the case of service note the following: 1) The 2 years warranty period commences with the purchase of the product and is applicable only to the original owner. 2) During the warranty period we will rectify any defects due to faulty material or workmanship by replacing or repairing the defective part at our decission. Further claims, and in particular those for price reduction, cancellation of sale, compensation for damages or subsequential damages, are excluded. The warranty period is not altered by the fact that we have carried out warranty work. 3) Unauthorized tampering with the product will invalidate this warranty. 4) Consult your authorized dealerr first, if warranty service is needed. Should it be necessary to return the product to the factory, please insure that a) the product is packed in original factory packing in good condition b) the warranty card has been filled out and attached to the product c) the product is shipped prepaid, i.e. at your expense and risk d) the receipt/invoice as proof of purchase is enclosed 5) Excluded from the warranty are: a) Shipping damages, either readily apparent or concealed (claims for such damages must be immediately notified to the forwarding agent). b) Scratches in metal parts, front panels or covers etc. This must be notified to your dealer within 5 days of purchase. c) Defects caused by incorrect installation or connection, by operation errors, by overloading or by external force. d) Products which have been repaired incorrectly or modified or where the product has been opened by other persons than us. e) Consoquential damages to other equipments. f) Reimbursement when repairing damages by third parties without our previous permission. 7

variable

adjustable Highpass from 30 Hz to 4 kHz
Important notice for the operation and installation of B2 and B4 Precision amplifiers: In case thr amplifier shuts off due to overheating, the integrated cooling fan cuts in until a temperature is reached that allows the amplifier to work properly again. Also due to the integrated safety electronics the amplifier turns on with a delay of 3-4 seconds caused by the internal check up of all relevant voltages that ensure perfect operation. This amplifier has several electronic protection circuits that shut off the amplifier at overheating, overloading, short-circuit on loudspeaker, low-ohmic mode or defective power supply. It is indicated through different LEDs, see CPS system No. 10-12 (B2) and No. 14-16 (B4). Please check for connecting failures such as short-circuits, wrong connections and over-temperature. If the amplifier does not turn on it is defect and has to be sent to your local authorized dealer for repair service. A detailed description of the malfunction and the purchase receipt has to be attached. Never connect the loudspeaker cables with the car chassis ground. It damages your amplifier. Ensure that the loudspeaker systems are correctly connected (phase), i.e. plus to plus and minus to minus. The plus pole is indicated on most speakers. Ex works the B2 is adjusted in 2-channel mode and the B4 in 4-channel mode.
adjustable Lowpass from 30 Hz to 4 kHz 23 Speaker terminal for channel A and B 24 Speaker terminal for channel C and D 25 Cooling fan On/Off control and adjustment of cooling fan start temperature To switch the cooling fan ON or OFF. In case the cooling fan is not used, set the switch to FAN OFF. In this position the cooling fan is not in operation. In case the cooling fan is used, the operation temperature can be chosen with this control. The temperature range starts at 40C and ends at 70C. 26 Control for temperature adjustment of maximum cooling fan speed To adjust the cooling fan speed (maximum power) to a defined temperature from 50 C to 80 C.
the line-outputs of the headunit or of a pre-amplifier i.g. HXE 100. This connectors are gold-plated to ensure a better signal transmission.
signal for the bridged channels, set the switch of the channels to be bridged (A/B or C/D) to BRIDGEDMONO IN. In this mode both bridged channels are connected to one channel (mono). On position BRIDGED-MONO IN only input A (6) for channels A/B and input C (8) for channels C/D must be used.

Example: On control position 50C the cooling fan would operate at maximum power at this temperature.
Technische Daten B2 PRECISION Ausgangsleistung RMS/Musik an 4 Ohm RMS/12 V: an 4 Ohm/13,8 V: an 2 Ohm/13,8 V: an 4 Ohm gebrckt: Frequenzbereich: Klirrfaktor: Geruschpegelabstand: TIM Verzerrung: Dmpfungsfaktor: Sicherung: Eingangsempfindlichkeit: Eingangsimpedanz: Mae (HxBxT) in mm: Gewicht: B4 PRECISION
Technical Data B2 PRECISION Cont. power rating RMS/Max. power at 4 Ohms RMS/12 V: at 4 Ohms/13,8 V: at 2 Ohms/13,8 V: at 4 Ohms bridged: Frequency range: Total harmonic distortion: Signal to noise ratio: TIM distortion: Damping factor: Fuse: Input sensitivity: Input impedance: Dimensions (HxWxD) mm: Weight: B4 PRECISION
2 x 80 W. 4 x 46 W 2 x 100/165 W. 4 x 60/100 W 2 x 180/300 W. 4 x 90/150 W 1 x 360/600 W. 2 x 180/300 W 20 Hz - 20 kHz. 20 Hz - 20 kHz +/- 0,5 dB. +/- 0,5 dB < 0,014 %. < 0,014 % > 96 dB. > 96 dB 0,02 %. 0,02 % > 450. > x 20 A. 2 x 20 A 500 mV - 8 V. 500 mV - 8 V 10 kOhm. kOhm 35 x 240 x 300. 35 x 240 x 300 3,1 kg. 3,1 kg
2 x 80 W. 4 x 46 W 2 x 100/165 W. 4 x 60/100 W 2 x 180/300 W. 4 x 90/150 W 1 x 360/600 W. 2 x 180/300 W 20 Hz - 20 kHz. 20 Hz - 20 kHz +/- 0,5 dB. +/- 0,5 dB < 0,014 %. < 0,014 % > 96 dB. > 96 dB 0,02 %. 0,02 % > 450. > x 20 A. 2 x 20 A 500 mV - 8 V. 500 mV - 8 V 10 kOhms. kOhms 35 x 240 x 300. 35 x 240 x 300 3,1 kg. 3,1 kg
AUDIOTEC FISCHER GMBH Gewerbegebiet Lake II Hnegrben 26 D-57392 Schmallenberg Tel.: ++49 (0) 29 72-0 Fax: ++49 (0) 29 72-88 E-mail: info@audiotec-fischer.com Internet: www.audiotec-fischer.com