I have an Avant setup with my Beosound 9000 (as just an audio source), Beosystem 4500, 2 Beola 6000s, a passive subwoofer, and 2 Beolab 4's as rear speakers. 99% of the time I just listen to CD's on the Beosound 9000 played through the Beosystem 4500/Avant on Speaker 4, so I can enjoy the surround sound effect. In other words, my Avant is the world's most beautiful and large surround sound processor. So here is my question. In my bedroom, I've got a Beosystem 7000 playing through Pentas. If I add an AV7000 and two rear speakers (like Beolab 4's) will I get surround sound when listening to the radio, CD, and phono? This would be a much smaller footprint then getting another Avant. 

Having had an AV 7000 many years ago, I believe that it will do exactly what you want if all you want is to add rear speakers for 4-speaker surround. However, I certainly would not recommend it for video. It actually makes even standard definition video worse with it's processing. Also, it looks like the system you have could be a 2-way communication system with a Beolink 7000, if you have it. Be aware that adding an AV7000 to the mix will remove the 2-way functionality and make your system only one-way.

The AV 7000 will only process the very old Dolby Pro Logic surround ... It only accept coomposite video... It can't control most of the modrn TV out there and is not upgradeable ... Center channel is passive .. very limited product...