Bullwinkle J Moose
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No downsides, but absolutely zero benefit. You need to remove the passive crossover and go active to derive any benefit from biamping.
S
That is comple nonsense
You can get a very decent improvement when Bi-Amping without resorting to active crossovers if you are building your own crossovers and speaker system
When using Dynaudio drivers with phase accurate 6db Butterworth crossovers, simply try the hybrid crossover approach to your design
Two way systems generally are easier to design and have fewer problems than 3 way designs, but when building a 3 way system, I used a low level passive high pass section with a high level passive low pass section
The tweeter is driven by a separate channel in a stereo amp with the low level high pass crossover "BEFORE" the amplification (between pre-amp and amp)
The crossover does not have active components and solves a lot of problems with 3 way systems
High frequencies have much better transient detail than when using high level passive crossovers
Normally, most people B-Amp for the bass section, but you will not gain as much in sound quality as when you Bi-Amp for the tweeter
It sounds counter intuitive to many, but it does work quite well
Bass and midrange use a 2-way high level passive crossover + a low pass inductor on the midrange at the tweeters crossover point
I have been using hybrid passive crossovers in Bi-Amped omnidirectional speakers now for about 40 years with great results
Only a phase accurate full digital crossover could compete with this and my next system will likely be digital