Home Speaker Asylum

General speaker questions for audio and home theater.

Okay now you have me thinking.

We've reduced the low frequency component of the signal. The peak voltage will go down, as will the RMS signal voltage. So in a way, by reducing the lowest frequencies, you could say we've also reduced the dynamic range of the SIGNAL. But we didn't change anything with the amp - it's max gain before clipping would remain the same.

So I guess if you reduce the RMS voltage of the signal with a highpass filter you have less "range" between the signal peaks and the RMS value. So if you reduce the peak voltage by 3db by removing bass signals, then you have 3db more to play with without any risk of clipping. BUT... with the bass removed you now have a smaller dynamic range of the amplified signal - aka - the signal will have a higher average POWER.

So, even though you might not clip the amp you might use up the amps thermal capacity quicker if you replace 3db worth of momentary bass signal with 3db worth of continuous "bass, midbass, mid and high" signal.

I think it would depend on the type of music, actually.

If you're talking electronic music with "bass beats" (current surges following voltage peaks) then I think you'd be looking at a more dramatic increase of average power dissipated when you use the "freed up headroom" for running only the full range signal.

Let me post some shots of waveforms for easier analysis. Woot woot.


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  • Okay now you have me thinking. - Presto 17:10:25 07/27/12 (0)


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