9815 Sub Level Control Not Working

[markgiardino]

I just had a shop install a Alpine 9815 HU, and an Alpine MRV-F340 4 Channel Amp.

They used channels 1 and 2 for the fronts, the HU for the rears and briged 3 and 4 for my single 10" sub. The sub is always on and the hu's sub level control has no effect. The installer says this is because of the bridging and the only way to get the level control to work is to give the sub its own amp. Is this true.

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[playa1 10+ year member]

probably because the back 3 & 4 channel RCA wires arent connected to the sub preout on your deck.That should solve the problem.

 

[markgiardino]

Thanks, but i just discovered the problem by experimenting. when i threw a switch on the amp from 1/2 to 3/4 the sub control started working.

 

[playa1 10+ year member]

Glad my sugestions worked