Uhh...yea. Its not like lower power means worse sound quality...it just means less output.
A sub made to handle 500rms getting 500rms will almost always be louder than a sub made to handle 3000rms getting 500 rms, if thats what you're referring to
Basically its like you're trying to say that when you turn down the volume on your HU it makes your sub sound worse...this really isn't very complicated..
at first I had a 12" CVR powered by a KX350 then I got a 15L7 and used the 350 on it for a week it wasn't as loud as the cvr was but it still sounded good, could have been the boxes they were in too.
if you turn the hu volume down you send less power to your subs so do your subs sound worse with low volume? no just quieter
oops the last poster beat me. takes to dam* long posting on a phone