High-pass filtering inputs

[GeorgeFBush]

Hi guys just a general question here about amplification. Is there any benefit in terms of the power generated or distortion levels of that power if you were to high-pass the incoming signal to an amplifier. Say with a sub, if I were to run the signal from my preamplifier, through a subs line level inputs and high-passed outputs, then into a power amplifier, would there be any noticeable or measurable improvement in the power output? Any chance of squeezing slightly more clean power out of a low-wattage amp by starving it of the more demanding frequencies?

 

[Paul Joppa]

Yes, that usually works just as you said. Of course, how much difference it makes depends on both the music you listen to, the crossover frequency, and the slope of the filter.

An additional benefit is that it reduces the excursion of the speaker cone, so the speaker also generates less distortion.

 

[GeorgeFBush]

Awesome thanks for the info, I'll give it a try on my next setup and see how it sounds.

The excursion thing is part of why I was thinking about it. Had to use a sub-sonic filter when using an old turntable through an old setup to prevent some weird woofer excursion.