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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: How is infinite baffle possible? posted by dave789 on January 5, 2016 at 10:50:14:
Because all sealed boxes represent points along a continuum, with Qtc rising as the box gets smaller for any given woofer. Lower Qtc means better damping, measured as less "ringing" in the impulse response.
Qtc = 0.707 is considered optimum by many designers, since it offers maximally flat bass extension. Qtc = 0.5 is "critically damped," with the tightest, most pitch-accurate bass (due to the least overhang or ringing), but reduced extension and power handling. A Qtc around 1.0, if I recall correctly, offers maximal power handling but with a bump in the response just above rolloff. This is a popular alignment for small monitors that want to give the illusion of "more" bass than they actually produce.
Infinite Baffle and Acoustic Suspension can be regarded as outliers on this continuum. True IB would have a Qtc considerably lower than 0.5, and a much larger box -- large enough that the air volume behind the woofer doesn't load it at all. AS is at the opposite end, with the air volume small enough to provide adequate "spring" for a special sloppy-suspension woofer. The combined Qtc would still be rather high.
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Follow Ups
- Better just to think in terms of Qtc - Brian H P 09:51:50 01/06/16 (0)
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