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Detailed instructions for use are in the User's Guide.
[. . . ] 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. [. . . ] Thus the amplifier is switched on and off with the head unit. The amplifier only turns on when the battery- and ground cables are connected first. 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. An area which has been cleaned of all paint residues. 4 Fuse The input fuse provides protection against internal equipment fault, i. The system must be additionally protected by a further line fuse located near the battery (max. 5 - 6 Signal inputs The HXA 20/ HXA 20X have RCA connectors for cinch cables leading from the preamplifier outputs, the line outputs of the head units or the outputs of a pre-amplifier/ equalizer, e. These connectors are gold-plated in order to ensure better signal transmission. 7 Green LED When the green LED is on the amplifier is in operation. 8 Yellow LED If the yellow LED is on there is a malfunction in the amplifier or a impedance less than 2 Ohms at the loudspeakers output. 9 Red LED The red LED turns on when the amplifier is overheated. 10 Selector switch for channels A and B For switching the frequency crossover to highpass , lowpass or full range. [. . . ] To connnect a subwoofer amplifier In general: Amplifier highpass channel A + B =RCA output 17 lowpass channel A =RCA output 18 lowpass channel B Amplifier lowpass channel A + B =RCA output 17 highpass channel A =RCA output 18 highpass channel B 11 Switch for selecting the frequencies range With this switch the adjustment range of the potentiometer 13 can be selected from 15 Hz to 1 kHz and from 1 kHz to 5 kHz. Please pay attention to connect all loudspeakers in proper phase, i. [. . . ]
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