ski bum
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Hello Mark-
"Anybody ever compared the above method of integrating a subwoofer with the alternate method of using two pairs of interconnects from a preamp, sending one pair to the SE84C+ (as usual), and sending the other pair to the subwoofer?"
-you miss out on the harmonic signature of the amp that you get on the high level / speaker output. -speaker outs will roll off the deepest bass below 30hz or so, where the line level output from your pre-amp or source will not. Pleasantly round Decware tone, or deep, uncolored extension seem to be the choices.
"Also, has anyone tried the more extreme method of using an external crossover between the preamp and the two power amps (SE84C+ and subwoofer) -- effectively routing the bass to the subwoofer, and everything above that to the SE84C+ ?"
-Extreme? All AVR's have bass management, so it's pretty common, although I think it's too bad it's not more common in the two channel realm. -High passing the signal to the Decware will reap big dividends in the headroom department. (As a bonus, it may filter out the hum which has bedeviled you, depending on how high you go with the crossover.) -level matching, picking crossover slopes and freq, measuring response, eq'ing to tweak the results, oh, yay. It's not as simple as it seems to go fully active; probably easier to screw it up than get it right. -as in the previous method, you don't get the amp's sonic signature going to the subs.
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