Parasound HCA-2003A versus HCA-2200II

Thanks for the first response. My thinking is the same here but what I would be doing is just moving the 2003A to center and surround duties and using the 2200II for L/R. I am trying to see if I will notice an appreciable difference. I have gotten some responses exactly like yours and some that say I will be blown away. Hard for me to believe. I have even been told that I would lose something as having the 2003A across the front for HT makes for more of a cohesive soundfield. Thanks.

Stereophile rated the 2200II as Class B and the 2003 as Class C.

I've sold both of those amps on a retail level over the years. I find that the difference between them is going to be minor, in terms of a sonic characterstic difference. They have a similar sound. But the 2200 does (as do most 2 channels vs mulit's) seem to have better channel separation and soundstaging capabilities. Micro-dynamics and Macro's might also lean a bit towards the 2200's favor. Overall, I'd probably say 5-10% at most difference overall for most applications you'll likely encounter.
I don't personally think the differnce is great enough(since the sonic league is the same) it's much of a step up. Unless you're a huge Parasound fan, I think you'll not get much of a large improvement over what you've got not.
A step to another amp altogether would be what you need to get better results. Still, "for that sound", there's not so much else to recommend. The Parasound has a warm bodied, bass weighty sound, with slightly rolled off top end. It's definitely listenable, and non-offensive. Overall, I like the Parasounds at the price points, and they make excellent HT and/or bass amps at THE VERY LEAST! For the record, both the 2200 and 2003 are in the same basic sonic league..which is borderline Class B..and rightly so.
Overall, I would not go from the likely "side-ways" move to the 2200 I think...if that is you still need the 3rd channel also. YOu'd change amps, but sound quality would remain similar. Doesn't make so much sense to me.