Kalali, the best way to do this is run your preamp output to a dedicated crossover like a dBx Drive Rack. The Drive Rack will then give you outputs to your satellite amp and subwoofers. Or your could get an Anthem Preamp which will handle the whole mess for you. If you have a lot of money go for a Trinnov Amethyst. Internalized subwoofer cross over/plate amps are problematic for the most part as their high pass filters are generally not that great. JL Audio is an exception. For that kind of set up to have a prayer of working well you need balanced ins and outs. Not using a high pass filter on the satellites is a non starter for those in the know.
Preamp connection to multiple powered subwoofers
I'm trying to understand how those of you who have multiple, say four, powered subwoofers in your 2-channel audio systems feed the signal from your preamplifier to these amplifiers in addition to driving your main speakers. In addition to the physical connectivity, I'm also wondering how is the impedance matching between the preamp output impedance and the combined input impedances of these multiple amplifiers is addressed. Using my system as example, my preamp has two parallel outputs rated at 600 Ohms with one set driving a tube amplifier rated at 100K Ohms. Would the second output be shared across four powered subwoofers, most likely Class D with generally low input impedance around 10K-20K Ohms? Or folks mostly use the high level speaker connections through the main speakers and split through to the rest of the subwoofers? I have the same question for those running passive subwoofers. Do you use the second preamp output to drive a dedicated 4-channel amplifier and out to the subwoofers, and if so, how do you handle the phase, gain, and frequency adjustments across the four subwoofers.
Appreciate any input.
Appreciate any input.