Thank you all for your well-considered responses. I am definitely not overdriving the system which is 400 watt per and being played at moderate volume. I could be that my CD's of organ are fairly lousy. They are mostly from the very first years CD came out and I particularly dont like the Telarc ones. I will get a copy of Felix Hell's and try that. If anyone else has great CD's of Bach etc to recommend I love to recieve them.
Joe
Joe