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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: You are kidding right? posted by Ozzy on February 21, 2012 at 03:57:11:
I have a system here (WMTMW arrays) with DSP-based active IIR crossovers (4th order) with "phase correction" that turns the textbook "LR4 transient response" (aka mess) into near perfect transient response, except of course for the post-ringing caused by the use of IIR filters.
I can say this much, being able to literally toggle between the two completely (theoretically different) systems, the changes are subtle at best. The fact the amplitude response is identical helps to ensure there is no confusing amplitude variations with changes in the time domain. I am not thumbing your nose at your speakers or your hearing accuity - but it is possible much of the "goodness" you attribute to transient accuracy COULD just be a case of you having a damned good speaker that is pleasantly voiced. I have had some very very fantastic sounding LR4 (acoustic) designs via both passive, active and DSP based filters - and LR4 has a transient shape that looks like a truck drove over it, with a large negative going initial impulse followed by considerable overshoot. Negative impulse, from all drivers with the + to + and - to -. Very interesting math that leads to all things positive and "in phase" to a negative impulse! Enter the strange land of group delay...
This kind of a/b testing is only possible with DSP based systems, but it can give one a feeling about the magnitude of these kinds of things. I am still trying to see if/how transient accurate speakers have this profound affect on ones ability to detect absolute polarity changes. I have yet to hear this phenomenon myself and freely admit it.
My ears are only 18c gold, after all.
Cheers,
Presto
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Follow Ups
- Actually.... - Presto 20:55:54 02/22/12 (0)
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