UR, I personally do have fairly 'complete' control. My speakers are the original Definitive Technology BP-2000's, a CLR-2000 center, BP-X sides, BP-20 rears. My signal handling is done by a B&K AVP-4090 pre-pro, and the power is supplied by a Sunfire Stereo (300W x 2) on the mains, and a Cinema Grand (200W x 5) on the center, sides, and rears. Oh, yeah, I use a Sony DPL decoder for rear-center extraction.

The BP-2000's have powered subs (300W ea.), with line-level inputs, and the B&K has LFE outs, so I think my signals are being handled adequately. I was merely pointing out that almost all speakers, even those with removeable links and are bi- or tri-wired, have the same type of "fixed in line level" high- and low-pass filters that you disdain.

I'm very familiar with active crossovers and multi-amp systems. Most people don't realize that the speakers' crossover components should be bypassed when multi-amp setups are used, because, beside interfering with the active crossover's settings,they also prevent the amps from controlling the drivers' movements outside the respective frequency ranges. (Known as 'damping')

Larry