A full active 3-way setup would require 2 4-channel amps or a 6-channel amp plus a mono amp or a single 8-channel amp, and the active crossovers to segregate the frequency cutoff points. Not to mention you will need a 3-way component speaker set (tweeters, mids, and mid-bass).
A 2-way active setup is easier to build as you just need a decent 5-channel amp together with an active crossover. Two channels for the tweeters, two channels for the mids, and the mono channel for the subwoofer.
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Last edited by Egan101; December 5th, 2018 at 08:31 PM.