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Question: Harman Kardon Avr 347

I'm up in the air about the 347 and 354 recievers from H@K. I like the idea about the abus feature the 347 offers, but don't like that it its not 1080p compatable. Can abus be used on the 354 reciever or do I have to by a adaptor to use the abus feature. If I do purchase the 347, how many abus wall unit can I use? Thanks.