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Detailed instructions for use are in the User's Guide.
[. . . ] 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. [. . . ] 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 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 - 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. 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. 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. 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. Controls and are solely intended for the purpose of sensitivity trimming. [. . . ] 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. [. . . ]
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