I have 8 speakers, that i have collected trough the years. they are most quiet powerful (8 ohms, 80-150w). they are all pairs, they all are from a different manufacturer so they have different bass/treble levels. what mad device can i use to connect all these beasts, and customize their treble/bass for every pair of speakers? (the speakers are not with a power source installed, so they will need a power amp)?p.s. the idea is basically --> [1-2 in : 8 stereo out]