ARGH! Too bad you didn't get a chance to hear the new PMC OB-1's cause they are everything you are looking for. It is too late to take the Revels back? The OB-1's have significantly more grunt than FB-1's, have much better midrange definition since they use the big dome out of the IB-1's as well as an upgraded tweeter. The F-30's are gonna sound that way pretty much no matter what you do, it is inherent in their nature and one reason you see a fair number of them for sale. I had a customer who just about drove himself crazy with the same thing you are experiencing... including trying about 10 different pieces of electronics. He finally sold the F-30's. Get thyself to your nearest PMC dealer and listen to the OB-1's.
Kevin
The Sound Broker
Kevin
The Sound Broker