Amp using too much power?

[net1]

Hi, I'm new to this forum, but not to online forums altogether. I did search around for an answer, but didnt find much.

Well, I have a RF 1000 watt amp powering two RF 10" subs, each are 500 RMS. When I first put the system in, it sounded great. Then over a little time, it stopped hitting so hard. Well eventually I was baffled as to the reason, and unhooked the power. Well I was just messing around with it and when I adjusted the gains on the line out converter, it sounded great. If I turn one gain on the LOC down and the other up, so only one sub is playing, it sounds great. I'm not sure what to do.

Any help is appreciated.

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