User manual DLS RA20

[. . . ] Contents Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Amplifier installation kit. . . . . . . . . . . . . . . . Routing Wires. . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] In this case you have to use a separate remote wire connected to the REMOTE-terminal instead. 5 CH2 CH1 Hi level input socket on amp. Automatic turn on when using high level input. With the "Input selector switch" set to High level and the "High level Auto Start" switch set to IN, the amplifier turns on automatically on high input. You don´t need to connect a separate remote wire from your head unit. If you want to use high level input but use a remote start wire, just set the "High level Auto Start" switch to OUT. RA20 & RA40 Input Level control The input level control, 7V ­ 0, 2 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 7V ). GAIN Crossovers TheDLS Reference amplifiers include high pass filter ( HP) and low pass filters (LP). The highpass filter can also be used as a subsonic filter. All filters are continously variable and all filters can be switched on and off. The slope of all filters are 12 dB / octave. The filter can be switched off if you want to run the amplifier in full range mode. This is the crossover configuration on RA20 & RA40: RA20: LP-filter 40 - 125 Hz HP-filter 20 - 150 Hz RA40 CH1 & 2: HP-filter 20 -150 Hz RA40 CH3 & 4: HP-filter 20 - 150 Hz LP-filter 40 - 125 Hz 7V 0, 2V 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. Turn the volume control down just a bit. Lower impedances may damage the amplifier. In bridge mode the amplifier sees a 4 ohm load as 2 ohm. Filter settings The HP-filter is here used as subsonic filter to take away the very deepest frequencies from the subwoofer. The typical setting is around 25 ­ 40 Hz. Filter settings With the HP-filter in OUT position the amplifier allows the speakers to play fullrange. If you for some reason want to limit the low bass reproduction switch IN the HP-filter. The typical setting is then around 60 ­ 80 Hz. The LP-filter will allow low frequencies only and blocks higher frequencies. When used with a subwoofer the switch should be in IN-position. BASS is used to increase the bass volume with a center frequency of 40 HZ. You can select the amplification between 0 dB ( no amplification ) and +18 dB (full amplification). The phase control can be set continuously from 0 - 180 degrees. [. . . ] If the noise does not return, reroute original cable away from source of interference. If noise remains regardless of cable position, try to use so called Quasi-balanced signal cables. DLS PRO-cables are Quasibalanced. Professional Tip: SPEAKER POLARITY CHECK. All speakers in a car audio system should be connected in phase (the same polarity). All speaker cones must move in the same direction. [. . . ]