I have the following components: 1) Denon surround sound amp 2) 2 Polk Audio Floor Standing Speakers - Rear 3) 2 Sony bookshelf speakers - wall-mounted - Front 4) Klipsch subwoofer - Rear Question: Since I want to arrange these speakers in an L-R Stereo configuration (listen to jazz while working on my computer) and the speaker placement is awkward to say the least, how can I adjust the volume and balance for each speaker independently? Please understand that I am not looking for a multi-room speaker control. I need to be able to control: 1) the volume and balance of my 2 front speakers 2) the volume and balance of my 2 rear speakers and subwoofer Is there such a unit that does all this??