Isn’t the use of active sub-woofers bi-amping?
I have tube amps, are people still using passive sub-woofers vs. powered ones, e.g. class-d?
No one mentioned the quality of the active X-over. There has to be a wide range in quality.
Like wise there was no mention of tri-amping. Wouldn’t leaving a passive X-over between the mid and high drivers and actively feeding the bass really be a hybrid?

