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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: stuffing vented boxes? posted by lama on January 30, 2000 at 04:53:47:
Lining a vented box with about 3/4 to 1" of sound absorbing material will usually only affect the vent output minimally, and kill internal reflections, which often make a box sound hollow or nasal. Any more than this starts to reduce vent output, raise the effective box volume and overdamp the woofer (hence the comments on loss of dynamics.In some cases, with a high Qt woofer, an overstuffed box can 'rescue' the system Qtc, and make the bass less boomy. Anything that causes the Qtc to go below about 0.5 or 0.6 will tend to be a considerable amount of overdamping, and will cause the loss of apparent dynamics.
It should be kept in mind that a lot of commercial speaker systems, vented or otherwise, have Qtc's on the high side, and many audiopphioes are used to hearing this, and consider an optimally damped system too lean and dynamically restricted, when in reality, they are so used to an overshooting woofer, that anything less seems like inadequate bass response.
Since ven a highly damped vented cabinet will, by definition, have more woofer overshoot than even a commercial sealed box, it would be hard to overdamp such a system, but again, listener percept has been defined by an awful lot of 'loose' bass.
Jon Risch
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Follow Ups
- Re: stuffing vented boxes? - Jon Risch 10:35:14 01/31/00 (0)
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