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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. 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. [. . . ] In order to ensure safe installation use only high quality connectors and materials. This is only activated if the head unit is switched ON. 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. 12 Switch for mono/ bridged and stereo With this switch the channels A and B (16) can be bridged to mono. In this case the total impedance of the connected speakers must be 4 ohm or higher. [. . . ] Example: If the chanels A and B are switched on Highpass 180 Hz, the frequencies up to 180 Hz (Lowpass) are provided to the RCA connectors 17 and 18, e. 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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