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In Reply to: RE: Efficiency of main speakers with subwoofer posted by Tubenstein on July 04, 2017 at 10:16:35
It depends on what you listen to and what kinds of music stresses your system now.Perceived loudness is determined by the midrange frequencies. High-pass filtering the main speakers won't affect that, so your system won't play any louder, except maybe in the bass.
If bass heavy music (dubstep etc.) is what causes you to hit your system's limits, then you might be able to use a smaller amp if you high-pass the mains. But if you're more of a jazz or classical listener, or even mainstream pop & rock, I suspect you will still need the power you have now.
Edits: 07/04/17Follow Ups:
With a solid-state power amp, the output voltage is independent of the load (for all practical purposes). In that situation one would still need the same voltage swing in the mid-band to achieve the same playback SPL, and therefore the same power.
Tube amps are a bit different in that they not only typically have higher output impedances, but usually also have various taps on the output transformer to achieve maximum power transfer. But that is a can of worms. When I had a Dyna Stereo 70, it sounded best with the output tubes strapped for triode operation. This dropped the output power almost exactly in half. Further, no matter what loudspeakers I used, it always sounded best when using the 4 ohm tap, which delivered the most current and had the lowest output impedance. One had to choose between musical magic and musical energy - it wasn't possible to have your cake and eat it too.
Strictly my personal opinion, prone to error, and not necessarily those of my employer or various tube manual authors.
Nice reading. Thanks.
ET
"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936
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