thank you for your help ,i have done t-line subwoofer boxes before ,they do need exact measurments or they sound horrible ,lol . also what is the address to your site? can i do a no box line array ? just a baffle board to mount the drivers? i have an idea with plexiglass and flat wire ,would look cool .if i don't need to tune the box then this should work ,correct? is there a different crossover for bi-amping? is it the same as a normal 2-way crossover or do you need to add more parts? and has anyone ever done a 3-way array speaker ,with a row of subs ,like 10" and then your row of mids and tweeters? how does an eq or a gate/limiter compressors ? used them both in car audio to get a perfect rta.