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I've been running a vintage Pilot SP210 tube preamp into my Audioengine A2 speakers. The problem I've run into is when connecting a subwoofer. The low input impedance raises hell with the preamp and messes with the gain. It seems like most subwoofers have a 10K or 20K input impedance. Thinking of adding some inline resistors along the RCA output of the preamp, but wondering if there are any subwoofers in existence with a very high input impedance that I could plug the preamp into, then connect the speakers to the subwoofer line outs?
Find a Sub that offers its hook up also at speaker level
Vandersteen, Rel etc
Since most subwoofers have an impedance of 4 to 8 ohms.
If so, here's a little trick I learned from Ed Schilling of the Horn Shoppe.
Hopefully your subwoofer amp will have a mono switch, like the one shown in the picture.
1. Get yourself a cheap throw-away pair of interconnects, and cut the two male RCAs off of one end.
2.Strip the wires, solder a 10k, 0.5W resistor in series with each positive wire, and hook the bare wires up to the output terminals of your main amp, right along with your speaker wires. Maintain phase.
3. Plug the two male RCAs into your "line in" input of your subwoofer amp, set it to mono, turn the sub amp on, and enjoy.
Its always worked for me.
Edit: Of course this hook-up method will do nothing to curb the low frequencies being sent to your main speakers, which will still be running full range. If that's not what you're after, you're going to have to go another route.
Good luck with it.
"Suddenly, I'm not half the man I used to be. 'Cause now I'm an amputee" J. Lennon
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