which amp to drive speakers! help!

[strkrfan13 10+ year member]

hey guys hope you can give me your recommendations. i have 4-way active setup running hertz Mille 3-way(the older with ribbon mids) tw, mids, ribbons, and morel 9" midbasses. Each set of drivers has its own amp. I have a butler tube 4channel(4x75), and 2 butler 2channel (2x150) which two drivers should i use for the two 2channel amps? and which for the 4channel? any recommendations would be greatly appreciated! thanks!

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