User manual DLS CAT31

[. . . ] How to install and operate the DLS CAT31 24 V amplifier Welcome! This owners manual is written in easy english and uses a lot of drawings to simply the installation and use of the above amplifier. Your DLS amplifier must be installed correctly in order to work well. This manual will show you how to install the amplifier like a pro. Please read the entire manual before beginning the installation. [. . . ] Be sure to use a rubber grommet or a plastic insulating tube where the cable passes the firewall or other places when it can easily be jammed. Use wire ties to secure to existing cables in the engine room. If you buy another power cable than the recommended, use the follwing maximum fuse values. fuse value for different cable sizes: 6 mm2 (9 AWG) :25 A 16 mm2 (5AWG) :60 A 33 mm2 (2AWG) :150 A 10 mm2 (7AWG) :40 A 21 mm2 (4AWG) :100 A 42 mm2 (1AWG) :200 A +24V REM GND +12V REM GND Ground Terminal ( GND ) Connect to a good chassis ground. The ground connection should be clean, unpainted metal to provide a good electrical connection. Use a wire brush, a scraper or a piece of an abrasive sheet to clean the metal. Use a lock washer or two to secure contact. Protect with silicon grease or by paint applied afterwards. +12V REM GND +24V REM GND Power Light / Protect light The power light (green ) comes on when the amplifier is turned on. The protect light ( red ) comes on when the amplifier shuts down from overheating or short circuit. Power (Green) Protect (Red) Fuses Use only 20 ampere ATC blade type fuses. CAT31 uses two 20 ampere fuses. 20A 4 CAT31 Input and controls Input Wiring Inputs may be low level from the RCA output of the car stereo or high level from the car stereo speaker output. Low level = RCA is to prefer for the best sound quality. Important Use either the low level or the high level input, do not use both at same time. Low level input Use a pair of shielded stereo audio cables with RCA type jack. The cable length varies depending on type of vehicle. Most cables can be bought in lengths from 1 up to 5, 5 meters. Avoid placing the RCA cable close to speaker cables, power cables and remote control cable. High Level Input Connect left and right speaker wires coming from the car stereo to the high level input as shown. You must connect both plus and minus as the inputs are balanced, connecting plus only gives lower level and bad sound quality. By changing the polarity of plus and minus, you can change the phase. High Input White White/black Grey/black Grey :A ch. + :A ch. :B ch. :B ch. + Input Level control ch. A/B/C (Level) The input level control, 5V ­ 0, 25 V, matches the output of your radio to the input of the amplifier. After installation is complete, make sure the input of the amplifier is turned down all the way ( counter-clockwise at 5V ). Play a tape or CD, make sure all bass or treble settings or equalizer are flat, and turn the volume of the radio up until you just start to hear distortion. [. . . ] Check quality of earth strap connection from battery negative terminal to chassis. Disconnect signal cables from amplifier to see if noise disappears. Test this by laying a new cable over the seats and reconnecting to the amplifier. If the noise does not return, reroute original cable away from source of interference. [. . . ]