User manual HELIX P 400

[. . . ] This is performed by means of four fixing screws screwed into a mounting surface offering sufficient retention and stability. 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 petrol 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. General instruction for connecting the amplifiers The HELIX amplifiers may only be installed in motor vehicles which have a 12-volt minus pole connected to the chassis ground. [. . . ] f) Reimbursement when repairing damages by third parties without our previous permission. Yours AUDIOTEC FISCHER Team 5 EQUIPMENT FEATURES AND CONTROL ELEMENTS PRECISION P400 1 Connecting the remote lead The remote lead 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 power cable to the positive terminal of the battery. 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 Fuses The input fuses are connected in parallel and provide protection against an internal equipment fault, i. e. the system must be additionally protected by a further line fuse located in the vicinity of the battery (max. The fuse rating is 3 x 25 ampere for both amplifiers. 5 Fuse function indication If the fuses (4) are destroyed due to malfunction the red LED illuminates. 6 - 9 Signal inputs The PRECISION amplifiers have RCA connectors for RCA cables that can be connected with the pre-amplifier output of the lineoutputs of the headunit or with a pre-amplifier. This connectors are gold-plated to ensure a better signal transmission. 10 - 13 Level controls for input sensitivity These controls can be used to match the input sensitivity of the individual channels 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 control range extends from 300 mV to 8, 5 V. 14 Signal input selector If only one stereo signal is available (i. 2 cinch leads connected), the inputs can be connected from A to C and from B to D by setting the selector switch to position 2. When selector is set to position 1, all the inputs are separate. 15 Selector switch for channels A and B To switch the internal active crossover to highpass/full range (linear) or lowpass. [. . . ] In addition, the amplifier can operate channels A and B as well as C and D in stereo or mono mode. The amp also can be connected for tri-mode use with one pair of wires (AB or CD) and have a third speaker connected in mono mode. 21 Frequency level control for highpass of CH A and B Control for the adjustment of the crossover frequency from 15Hz to 4 kHz. 24 Frequency level control for lowpass of CH C and D Control for the adjustment of the crossover frequency from 15Hz to 4 kHz. TECHNICAL DATA PRECISION P400 Cont. 1 x 350/595 Watts RMS/Music Frequency response . [. . . ]