I started a thread about a month ago about biamping, It had an incredible response, and a wealth of information shared. After reading views upon views, It seamed evident that most agreed that horizontal biamping achieved the best overall results regarding quality. This seams to be in direct conflict with the statement made by abstract7. It is possible that I have mixed up the differences between horizontal and vertical biamping. Let me state the way I understand it so I may be corrected if I have it wrong. In vertical biamping, each amp is doing the low and high frequencies on each individual speaker. In horizontal biamping, one amp is doing to low frequencies on both speakers and the other amp is doing the high frequencies on both speakers.