IMO, it's more of function of the power amp. It's running out of steam. The more powerful an amp, the sound presentation will become "relaxed" esp. at higher volumn. The bass will become deeper and fuller. You may be shocked at how much better your spks. may sound w/a more powerful amp. This has been my experience. Right now I'm running a 50w Rotel RB-951 MkII amp on my main system and it sounds very good, but, I know if I were to exchange it w/a say 200w RB-990/991 the sound would become much better. (One time I introduced a Bryston 4B-ST in the system and the difference was night and day better.) Try adding an amp to your 7240 and see how things sound. The next step would be adding a dedicated NAD pre-amp. Used about $300. Add a little NAD tuner 1150/1155 or even an older 402 and you'd be pleased. BTW, I own the 402 tuner and it's a fantastic tuner. The 412 tuner is in the standard 17" width where as the 402 is 16 1/2". Bill