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Message: <blockquote data-quote="thch" data-source="post: 1240352" data-attributes="member: 562032">biamplification means using multiple (2) amplifiers for component speakers.  in this case, 1 amp for the tweetes, one for the midwoofers.from here, the crossover is still required.  this are usually preamplifer: active, passive-preamp(fmods), or DSP based(HU).  fmods probably shouldn't be used due to some technical issues.  HU filters have the advantage of high configurablity and good matching.sometimes a postamplifier fillter (passive crossover) for each filter.  this is not an ideal situation either, there shouldn't be a need for a second amplifier.so in short, you need:4 amplfier channels (2 2channel amps, or 1 4 channel amp)1 good HU  OR an active crossover with filter in the 2-4khz range.either way, you need fitlers in the 2khz to 4khz range.</blockquote>

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