15Hz 1kHz

1kHz 5kHz

1kHz 17 5kHz
Pos. 1 = 15Hz - 1kHz Pos. 2 = 1kHz - 5kHz

Valid only for HXA 40X

High pass Full range Low pass Channel D+C
High pass Full range Low pass Channel B+A

BASIC INSTRUCTION SHEET

4-Channel mode
SPEAKER CONNECTIONS 3-Channel mode

2-Channel mode

-- + -- +

Speaker output

Speaker output Speaker output AT 2 OHM WE RECOMMEND TO USE THE COOLING FAN HXF 30
AUDIOTEC FISCHER HUENEGRAEBEN 26 D-57392 SCHMALLENBERG GERMANY
on speaker protection temperature protection

D Channel Input

B Channel Input
A Ground +12 V Remote Fuse 30 A
Schalter 12: Position 1+3

Schalter 12: Position 2

Wichtiger Hinweis! Verbinden Sie niemals die Lautsprecherleitungen mit der Kfz-Masse (Chassis). Dieses kann Ihren Verstrker zerstren. Achten Sie darauf, da alle Lautsprechersysteme phasenrichtig angeschlossen sind, d.h. Plus zu Plus und Minus zu Minus. Der Pluspol ist bei den meisten Lautsprechern gekennzeichnet. Important! Do not ground speaker output terminal to vehicle chassis.This can destroy your amplifier. Please pay attention to connect all loudspeakers in proper phase, i.e. plus to plus and minus to minus.

dB 0 -5 -10 -1K Hz

Hochpass/Tiefpass 90Hz Highpass/Lowpass 90Hz

HXA 40X

dB 0 variabel -5 -10 -1K Hz

450 1K

Schalter 15/16 auf Position 1 Schalter 13/14 auf Lowpass Tiefpass: 15Hz - 1kHz Switch 15/16 at Position 1 Switch 13/14 at Lowpass Lowpass: 15Hz - 1kHz

No.17/18

dB 0 variabel -5 -10 -1K 2K 5K 10K Hz

1,8 1,5 1,3 1K

2,7 3,3 4K 5K
Schalter 15/16 auf Position 2 Schalter 13/14 auf Lowpass Tiefpass: 1kHz - 5kHz Switch 15/16 at Position 2 Switch 13/14 at Lowpass Lowpass: 1kHz - 5kHz
Schalter 15/16 auf Position 1 Schalter 13/14 auf Highpass Hochpass: 15Hz - 1kHz Switch 15/16 at Position 1 Switch 13/14 at Highpass Highpass: 15Hz - 1kHz
Schalter 15/16 auf Position 2 Schalter 13/14 auf Highpass Hochpass: 1kHz - 5kHz Switch 15/16 at Position 2 Switch 13/14 at Highpass Highpass: 1kHz - 5kHz

ENGLISH

Dear Customer, congratulations for purchasing this high-quality Helix amplifier, made in Germany. This new Helix amplifiers highlights best quality, excellent manufacturing and stateof-the-art technology. They are the optimum completion of Helix Performance Line by Audiotec Fischer. 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. We wish you a lot of fun with your new Helix amplifier. Yours, Audiotec Fischer Team Installation Instructions Before you start installation, disconnect the car battery at the minus pole. We would urge you to have the installation work carried out by an authorized specialist as verification of correct installation and connection is a prerequisite for warranty cover of the Helix amplifiers. Install your amplifier at a dry location with sufficient air circulation to ensure adequate cooling of the equipment. For safety reasons, the amplifier must be secured in a professsional manner. For this use the attached four fixing screws and fix them into a mounting surface offering sufficient stability. Before drilling the holes for the screws, carefully examine the area around the installation position and make sure that there

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 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. Instruction for connecting the amplifier The Helix HXA 40/ HXA 40X 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 max. 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 connectors and materials. Ask your dealer for Brax and Helix accessories.
1 Connecting the remote wire The remote wire 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 cable to the positive terminal of the battery. Recommended cross section: 10 mm2. 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 Fuse The input fuse provides protection against internal equipment fault, i.e. the system must be additionally protected by a further line fuse located near the battery (max. distance from the battery: 30 cm/ 12 inch). The fuse value of the amplifier is 30 Ampere. 5 - 8 Signal inputs The HXA 40/ HXA 40X have RCA connectors for cinch cables leading from the pre-amplifier outputs, the line outputs of the head units or the outputs of a pre-amplifier/ equalizer, e.g. HXE 100. These connectors are gold-plated in order to ensure better signal transmission. 9 Green LED When the green LED is on the amplifier is in operation. 10 Yellow LED If the yellow LED is on there is a malfunction in the amplifier or a short-circuit at the loudspeakers. 11 Red LED The red LED turns on when the amplifier is overheated. 13 Selector switch for channels A and B For switching the frequency crossover to highpass, lowpass or full range. 14 Selector switch for channels C and D For switching the frequency crossover to highpass, lowpass or full range. 19 - 20 Switch for mono/ bridged and stereo With this switch the channels A and B (19) and C and D (29) can be bridged to mono. In this case the total impedance of the connected speakers must be 4 ohm or higher. In stereo mode the connected total impedance per channel can be 2 ohm or higher. In mono mode the total input signal of both channels cannot be higher than 8.5 V ! 21 - 24 Level adjustment 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 adjustment range extends from 350 mV to 8.5 V.

controls and are solely intended for the purpose of sensitivity trimming. The adjustment range extends from 350 mV to 8.5 V. 25 Speaker connection terminal for channels A and B 26 Speaker connection terminal for channels C and D Integrated active crossover of HXA 40 The HXA 40 has an integrated active crossover of 90 Hz/ 12 dB Oct. The operating mode can be selected with the switches 13 and 14.

Only for HXA 40X:

12 Selector for signal inputs Position 1: If there is only one stereo signal provided, use switch 12 at position 1 only for the inputs A and B (only this input RCA connectors can be used at position 1). Position 2: In this position all four inputs of the amplifier can be used. On both positions the residual signal from channel C and D is applied at the RCA outputs 27 (C) and 28 (D). Example: HXA 40/ HXA 40X channel C and D highpass =RCA output 27 lowpass channel C =RCA output 28 lowpass channel D Position 3: Full active operating mode The HXA 40X can be used in this operating mode for a full active system. In this case the inputs A and B (only these can be used in this mode), controlled by the switches 13 and 15 with the use of controller 17, the frequencies for the speaker outputs A and B will be specified. The signal which is not processed from both channels (remaining signal from A and B) will be supplied to the channels C and D. At this channels C and D the remaining signal will be specified with the switches 14 and 16 and controller 18. The signal that remains of channel C and D is supplied to the RCA connectors 27 and 28 where it can be used for connecting an additional amplifier. Example: If A and B are used as highpass at 4 kHz, the frequencies up to 4 kHz are provided to the channels C and D. If the frequencies are used for highpass, i.g. 180 Hz, the channnels C and D get a bandpass signal from 180 Hz to 4 kHz. The frequencies up to 180 Hz are provided to the outputs 27 and 28 for connecting an additional subwoofer amplifier. 15 - 16 Switch for selecting the frequencies range With this switch the adjustment range of the potentiometers 17 and 18 can be selected from 15 Hz to 1 kHz at position 1 and from 1 kHz to 5 kHz at position 2. 17 - 18 Frequency controller Frequency adjustment controller for the channels A+B (controller 17) and C+D (controller 18). 27 - 28 RCA outputs The RCA outputs supply the residual signal for connecting an additional amplifier. (look at point 12).
Technical Specifications: Cont. Power rating at 4 Ohm p. channel Cont. Power rating at 2 Ohm p. channel Cont. Power bridged into a 4 Ohm load Frequency Response Total Harmonic Distortion (THD) TIM Distortion Signal to Noise Ratio Input Impedance Input Sensitivity Fuse Dimensions (HxWxD) in mm Weight net HXA 40 Switchable Frequency Crossover HXA 40X Adjustable Crossover 4x60/80 Watts RMS/Max. Power 4x90/125 Watts RMS/Max. Power 2x180/250 Watts RMS Max. Power 20Hz-20kHz,+/-0,2dB <0,009% <0,016% >100dB 10kOhm 350mV-8,5V 30 Ampere 31,5x218x295 2,4kgs Highpass/Lowpass 90Hz and Full Range Frequency range 15Hz-5000Hz HP/LP Also to use for bandpass