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Speaker Asylum General speaker questions for audio and home theater. |
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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: perfect phase response with built-in 3-order hipass filter??? posted by mäç on August 16, 2009 at 18:14:55:
it's physics. For those who believe time and phase-alignment is essential, it is accepted that time and phase-alignment is less relevant in the lower bass regions as presented by the loudspeaker itself.
Why? Well, first of all a single bass note wavelength will not fit into a room. Let's look a the wavelengths of various notes:
First Key of a piano - 27.5 Hz - 12.5 meters
Middle C - 261.63 Hz - 1.31 meters
Last key of a piano - 4186.01 Hz - 0.082 meters
You can see that wavelength really starts to increase in the mid-bass region of the audio spectrum (as frequency decreases). There's no way A(0) will fit within my room (so it wraps all around, and I hope that my room is not some nice, neat fraction of this wavelength that will create a node or a null in my listening position).
Also, since bass is less localizable (if that's a word), what you perceive as low-end is dominated by other factors (room loading, geometry and absorption, etc. This leads back to point #1.
Does this make sense?
I am a huge time and phase-alignment proponent, and I use my 2 powered subs both destructively and constructively to smooth out the sub-60 Hz response in my listening space.
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Follow Ups
- Quite simply... - Nicholas Renter 18:48:38 08/16/09 (4)
- good answer, but... - mäç 19:02:24 08/16/09 (3)
- You don't even need a filter for that trick - Presto 12:38:05 08/24/09 (0)
- It's been a while... - Nicholas Renter 19:44:24 08/16/09 (1)
- Phase, crossovers, bass alignment - badman 07:56:33 08/17/09 (0)
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