preamp to via rca subwoofer, then rca from sub output (crossed over) into your amp.
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If you want to high pass to the speakers you can use this HSU high pass filter. If you want to run the speakers full range you will need Y adapters from preamp into amp and into the subwoofer!
I use this to high pass to main speakers!
You will need 2 pairs of Y adapters to do any of these choices!
I’ve tried it both ways and I prefer using high pass to the speakers. Some prefer running full range. It all depends on the speakers that you are using. What sub are you using? I doubt that it has a high pass filter ! BTW, if you decide to go with the line level option these y adapters are what I use!