I personally believe that the two most likely B&M suspects are NAD and Anthem. Being a Canadian it pains me to say that.

NAD has recently released the feature poor T 187 processor ($3K) with Audyssey MultEQ XT that is made in China so the 978 really could have hurt them big time.

As for Anthem, while their two processors are made in Canada (AVM 50v & D2v), their AVRs are made in China. Nonetheless, the 978 would have competed with at least the lower end AVM 50v ($6K) and I believe quite favorably at that.