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I have a two chanel class d amp. I have it hooked up to 2 subs, on two chanels. They are not bridged. The amp has two RCA input jacks. When I put one in both chanels play. But when I put both in they dont. My RCA conections are good because they play when either the L or R connection is in, but just not both. Can any one help me out. By the way the RCA connections are from a step down.

the amplifier is damaged.
you have a bad ground line for the line in signal inside the amplifier causing a short between the two channels.. one or the other works alone, but connecting both at once causes a short between both channels, and thus your problem.
this also explains that thumping or pulsing noise in the other thread.
time for a better amplifier

wait... so putting both RCA's into your amp for the l/r speakers causes them to short?!

How can i avoid stuff like this when isntalling my amp?

dont install a damaged amp.....if your amp is ok you shouldnt ahve this problem

oh okay.

my amp is brand new, its just siting in its box all pretty, waiting to be installed!

Well actualy I figured out the problem. When my step down was put in it was put in incorrectly. Where the wires should of been + - they were hooked up - +. Ie causing them to be inverted when both rca jacks were inserted. My amp is not damaged.

aha, so it was a short.. it was just at the LOC and not at the amp.
my prior post was closer to the problem.. it was just a matter of finding where the problem was.
I was thinking it was at the input stage, and it was at the line out converter

glad ya found it

That's good your amp isn't faulty. Now go back to that installer and explain your problem to them :)