Rockville RXD-F20, Manual

Page: 8 / 12

4 CHANNEL AMP WITH 2 CHANNEL INPUT
If your head unit has 2 pairs of RCA ouput jacks, input Front Left and Front Right in to Channels 1 and 2. Then attach radio output Rear Left and Rear Right to
Channels 3 and 4. Set the input Mode Switch to 4CH position. The pre amp circuitry will not mix any signals thereby preserving full Left to Right Balance and
Front to Rear fader control.
Should your head unit have an additional subwoofer RCA output, that typically needs to be attached to a separate subwoofer amplifier.
When configuring a 4 channel amplifier to a 3 channel system, you can use an RCA Y adaptor to send the subwoofer proamp signal to channels 3 and 4 and bridge
those channels to the subwoofer. Use Y adaptors to mix channels 1 and 3 and input them in to RCA Channel 1, then mix channels 2 and 4 and input the min to RCA
Channel 2. The result will be preserved Left and Right balance with constant subwoofer output.