billfitzmaurice
Seasoned Veteran
Last Activity: Yesterday, 11:06 PM
Joined: 11-11-2006
Location: New Hampshire
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The non-porous part occupies volume, the porous part doesn't. That said, I never use anything of that sort. A well constructed speaker cabinet gains nothing... -
Qtc effect on group delay and transient response is a minor consideration. Of far more concern is the effect on F3, the amount of hump above F3, and the...Leave a comment:
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Listen Ma! No bass!
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That's the reason my long forgotten source gave. With low frequencies especially a mic can have trouble telling the difference between a sound pressure...Leave a comment:
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It's not the directionality of the source that matters. it's the directionality of the mic. Measurement mics are omni-directional.
[Whatever source...Leave a comment:
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A null at 370Hz makes the 1/4 wavelength distance about 9 inches. That's not necessarily the distance from the baffle to the wall. It could be the distance...Leave a comment:
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Not at all. I agree that flaring both ends is beneficial when port velocities are very high. I make it a point not to use port areas that are so small...Leave a comment:
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I've used Formby's Tung Oil for over thirty years. It doesn't get a lot of love, but I can't say why. You can put on two or three coats a day, and it...Leave a comment:
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In the AES document it seems like the writers wanted to prove their point with a worst case scenario. Using a 3 inch port with two twelve inch long excursion...Leave a comment:
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Air does not flow in a port as shown in the diagrams. It acts more as a single mass of air that vibrates back and forth....Leave a comment:
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Driver wavefront integration isn't a problem if the drivers are small enough. What's more of a concern is the small vertical dispersion angle, which gets...Leave a comment:
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If ports passed midrange those diagrams would have merit. The long wavelengths that ports pass don't have problems navigating around corners.Leave a comment:
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T30 or T45 (same design but a different shape) are tough to match, let alone beat, for music. Your only worry would be complaints from the neighbors should...Leave a comment:
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The area of the ports they used was too small, so they were dealing with abnormally high port velocities. That being the case the application of Bernoulli's...Leave a comment:
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It doesn't produce appreciably better results either. Its use dates back to the days when many speakers were large full rangers, where internal dimensions...Leave a comment:
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Assuming you're making a pro-sound sub don't use the LAB 12, sensitivity is much too low unless you horn load it. If it's for HT or hi-fi don't use it,...Leave a comment:
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It doesn't, unless you consider a very large infinite baffle a sealed sub. For instance, the mentioned Fathom W7 13.5 inch version has a 23.5Hz Fs, but...Leave a comment:
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Where flares are concerned a flare of the port output eases the transition from port to baffle, which can reduce turbulence sourced noise compared to...Leave a comment:
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Group delay is another factor that can't be heard in the subwoofer pass band, so that's another one of the so called benefits of sealed subs that can...Leave a comment:
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Just as you can't hear transient response with subs you also can't hear phase. What you can hear is high distortion, which is the risk you run when you...Leave a comment:
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