User manual HELIX HXA40X

[. . . ] 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. [. . . ] 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. 10 Yellow LED If the yellow LED is on there is a malfunction in the amplifier or a short-circuit at the loudspeakers. 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. [. . . ] 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. [. . . ]