User manual DLS RA30

[. . . ] Contents Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Amplifier installation kit. . . . . . . . . . . . . . . . Routing Wires. . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] CH 3&4 high level inputs feeds the sub channel. CH4 CH3 Hi level input socket on amp. Green: Left + Black: Left Black: Right Grey: Right + Hi level input plug. High / Low level input switch To ensure best possible performance from the amplifiers a switch is installed to select between Hi and Low input. When using High Level input: Push in the button to position "High Level" When using Low level input: Push out the button to position "Low Level" High Level Input for ch 1 & 2 on RA25 and RA30 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 level input socket for CH 1 & 2 Green: Left + Black: Left Black: Right Grey: Right + Hi level input plug. Hi level auto start switch To ensure best possible performance from the amplifiers when used with high level input a switch is installed to select between Automatic amplifier start and remote wire start. When using High Level input with automatic start: Push the button to position IN When using High level input with remote wire start: Push out the button to position OUT NOTE!Some head units use BTL output IC:s that have a constant 12 Volt + on the speaker terminal, also when shut off (the Power LED indicator lights constantly even when the head unit is off). 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. RA25 & RA30 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 The DLS Reference amplifiers include high pass filter (HP) and low pass filters (LP). The highpass filter on RA25 can also be used as a subsonic filter. The slope of all filters are 12 dB / octave. The high pass filters can be switched off if you want to run the amplifier in full range mode. It can be connected either as a stereo amplifier for fullrange speakers, or as a mono amplifier for a single driver connected in bridge mode. Two fullrange speakers connected in stereo mode One speaker connected in mono bridge mode + - + + - Filter settings NOTE!4 ohm minimum load when using bridge mode connection. Lower impedances may damage the amplifier. In bridge mode the amplifier sees a 4 ohm load as 2 ohm. Bridge mode can be used to connect a center channel speaker. [. . . ] 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. Out of phase speakers will cause a lack of bass, and a poor stereo soundstage. Checking polarity: Hold the - connection of the speaker wire to the terminal of a 1, 5 Volt flashlight battery. [. . . ]