INSTRUCTION MANUAL

G E R M A N Y
2-and 4-Channel High Power Amplifier

ENGLISH

Dear Customer, congratulations on your purchase of this high-quality HELIX DARK BLUE amplifier. This series highlights best quality, excellent manufacturing and state-of-the-art technology. After 23 years of experiences in the research & development of audio products this amplifier generation sets new standards. The attractive typical HELIX DARK BLUE design makes this amplifier an outstanding and top of the class product. We wish you many hours of enjoyment with your new HELIX amplifier.
General installation instructions for HELIX amplifiers 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 instruction 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. 5
Yours AUDIOTEC FISCHER Team
EQUIPMENT FEATURES AND CONTROL ELEMENTS DARK BLUE 2
EQUIPMENT FEATURES AND CONTROL ELEMENTS DARK BLUE 4
Connecting the ground cable 2 Connecting the remote lead 3 Connecting the battery cable
Fuses 2 x 25 ampere 5 Speaker terminal
4 Fuse 30 ampere 5 Speaker terminal
11 Switch for highpass - linear low pass/band pass 12 Lowpass control 13 on LED 14 Protection LED Anzeige 15 Signal outputs
6 Signal inputs 7 Switch for high-level and low-level input signal 8 Level controls for input sensitivity 9 Bassboost control at 45 Hz 10 Highpass control
11 Switch for highpass - linear low pass/band pass 12 Lowpass control 13 on LED 14 Protection LED 15 Signal outputs
1 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. 2 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. 3 Connecting the battery cable Connect the +12 V power cable to the positive terminal of the battery. Recommended cross section: min. 16mm2.

8 Level controls for input sensitivity These controls can be used to match the input sensitivity of the individual channels 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 200 mV to 8 V. 9 Bassboost control To raise the bass signal from 0 to 18 dB at 45 Hz.
SPEAKER CONNECTIONS DARK BLUE 2

Stereo Mono

variabel

Hz 500

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 rating for DARK BLUE 2 is 1 x 30 amperes and 2 x 25 amperes for the DARK BLUE 4. 5 Speaker terminals To connect the speaker cables. See figures on page 6. Never connect the loudspeaker cables with the car chassis gound. It damages your amplifier. Ensure that the loudspeaker systems are correctly connected (phase), i.e. plus to plus and minus to minus. Exchanging plus and minus causes a total loss of bass reproduction.The plus pole is indicated on most speakers. The impedance per channel should not be lower than 2 ohm as overheating could cause a shut down of the amplifier. 6 Signal inputs The DARK BLUE amplifiers have RCA connectors for RCA cables that can be connected with the pre-amplifier output of the line-outputs of the headunit or with a pre-amplifier. This connectors are gold-plated to ensure a better signal transmission. 7 High- and low level signal switch To change the input signals from low level (head unit or preamplifier) to high level (speaker outputs of head unit). In both cases RCA cables function as line-inputs.
SPEAKER CONNECTIONS DARK BLUE 4
10 Frequency range control for highpass To adjust the crossover frequency from 15 Hz to 4000 Hz Highpass: 15 - 4 kHz 4-channel

3-channel

11 Control for HP / Fullrange / and TP/BP To switch from the internal active frequency crossover to high pass / full range / full range (linear) or lowpass. If this switch is set on HPF Highpass the crossover frequency for the highpass can be adjusted with control 10. At switch position Full (fullrange) the internal frequency crossover is not active. At switch position LP/BP (lowpass/bandpass) the highpass is always active. That means a bandpass is built in any case. With switch 10 adjust the highpass and with control 12 adjust the lowpass. Thus every desired bandpass between 15 Hz and 4000 Hz can be adjusted. 2-channel

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 10 as variable subsonic filter or turn it counter-clockwise to 15 Hz to get a subsonic filter. 12 Lowpass control To adjust the crossover frequency from 40 Hz to 4000 Hz Lowpass: 40 - 4 kHz
TECHNICAL DATA DARK BLUE 2
Cont. power rating at 4 Ohms per channel measured at 13,8 V. 2 x 80/160 Watts RMS/Music Cont. power rating at 2 Ohms per channel measured at 13,8 V. 2 x 120/240 Watts RMS/Music Cont. power rating at 1 ch. bridged at 4 Ohms. 1 x 200/400 Watts RMS/Music Frequency response. 20 Hz - 20 kHz, +/- 0,3 dB Bassboost.0 - 18 dB Setting range highpass. 15 Hz - 4 kHz Setting range lowpass. 40 Hz - 4 kHz Setting range highpass. 15 Hz - 4 kHz Total harmonic distortion (THD). < 0,09% TIM distortion. < 0,016% Signal to noise ratio. > 90 dB Input impedance. 10 kOhms Input sensitivity.200 mV - 8 V Fuse.1 x 30 Ampere Dimensions (H x W x D) in mm. 58 x 190 x 280 Weight net. 4,7 kg

WARRANTY REGULATION

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 dealer 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.

TECHNICAL DATA DARK BLUE 4
Cont. power rating at 4 Ohms per channel measured at 13,8 V. 4 x 60/120 Watts RMS/Music Cont. power rating at 2 Ohms per channel measured at 13,8 V. 4 x 100/200 Watts RMS/Music Cont. power rating at 1 ch. bridged at 4 Ohms. 2 x 180/360 Watts RMS/Music Frequency response. 20 Hz - 20 kHz, +/- 0,3 dB Bassboost.0 - 18 dB Setting range highpass. 15 Hz - 4 kHz Setting range lowpass. 40 Hz - 4 kHz Setting range highpass. 15 Hz - 4 kHz Crossover setting range. 15 Hz - 4 kHz Total harmonic distortion (THD). < 0,09% TIM distortion. < 0,016% Signal to noise ratio. > 90 dB Input impedance. 10 kOhms Input sensitivity.200 mV - 8 V Fuse.2 x Ampere Dimensions (H x W x D) in mm. 35 x 240 x 432 Weight net. 4,7 kg
13 Power LED Shows the operation mode of the amplifier. 14 Protection LED The red LED indicates malfunctions of the amplifier. The DARK BLUE amplifiers have several electronic protection circuits that shut off the amplifier at overheating, overloading, short-circuit on loudspeaker, low-ohmic mode or defective power supply. 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 send to your local authorized dealer for repair service. A detailed description of the malfunction and the purchase receipt has to be attached. 15 Signal outputs Full range RCA outputs to connect other amplifiers.
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