I recently purchased a new pair of VMPS RM40 speakers, and have been running them with a 4bst. They are in a fairly large room 27'x19', and I feel they could do better with more power. My thoughts are to possibly pick up another 4bst and biamp, or to sell the 4bst and search for a used pair of 7bst monos. I would appreciate anyone sharing their thoughts or experience along these lines. The speakers are rated at 4 ohms, and although the 4bsts can be set to use as monos, I wasn't sure if this could be yet another option.