RCA plugs on a Bridged 4 ch amp.

It depends on the amp, some amps have a switch for 2 or 4 channel input, others require Y adapters, that info should be in the manual.

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It did not say in manual if all 4 RCA had to be used. But it only said about bridging to 2 ch the speaker wires. The Kenwood XR400-4 amp So that is why i am asking the question. I did install the amp with the Y adapters to all 4 ch

the subs sound ok though and don't seam to have any issues.

That amp has a switch, set the "Input Sel." switch to "A" then you only use "Line In A" no Y's needed.

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oh ok i saw that switch but it did not specify that what it was for. But for now i have it set to A/B and using a Y adapter and 4ch. Will that hurt it ? Personally i don't think so but let me know if i'm wrong.

Bass sounds good though. I just may have to reach under seat and fix it to A switch and plug only 2 RCA in.

Thanks

Do you have 4 rca already ran? Just plug them all in like normal then switch to bridged if that’s what that switch is. The amp should pull whatever signal it needs with all 4 rca connected..

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yes i already have the 4 ch with Y adapters plugged in. I have it set up with the R rca set to R side of amp and L rca set to L side of amp. So if there is a portion of a song they will go from side to side like R to L the subs will make it so. There has been many rock songs that have one channel of song then the other channel kicks in. Allen Parson Project has a few songs like that the move from side to side in the songs and everything matches. I have heard rock drum solos that do the same. So when many installers say just use a mono sub amp or a single channel on a 2 ch amp, they miss out on the songs that were recorded with any of the sound moving from left to right. One song that comes to mind is

Van Halen - Everybody Wants Some!! the drum intro moves left to right. You can really hear it pronounced in a pair of headphones. but, in my car sound system it you can also hear it move L to R. This is how the Artist intended for it to be heard. I know you pro installers out there know what I'm talking about. Some have commented to me that i should just install a mono sub amp in my system and wire to 2 ohm. but NO WAY. that just me. I respect all own tastes.

But everyone has there own taste on music. Thanks