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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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In Reply to: RE: V-vent enclosure posted by kenpeter on October 17, 2007 at 13:04:12:
The vents are large....18" x 6" x 15" deep ( two combined).
There is a pillow sized wad of insulation behind the woofer-- no place else. Using more insulation just sucks up power and adds unwanted resistance between vent an box.
The vent extends to within 1.5" to the back of the box- this distance plus the insulation cut everything above 200Hz from leaving the vent- upper harmonics of "boom" are suppressed. ( a mechanical acoustic filter)
The "V" shape suppresses the lower internal box resonances to a degree. For example a 5" dia hole x .75" long would create a narrow "Q" , or very peaked response if close miked at vent, you would hear all the echoes in the box.
With the V vent the altered nearfield response has a better phase response when the rear wave combines with the front wave. The result is you do not hear the upper harmonics, and you get good loading because the vents are on the floor.
I will post curves soon on my website.
Right now I am all speakered out, I am going to watch a horror movie.
Best, Bill
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Follow Ups
- spread out the reflex and Q of the vent - RCA-fan 10/17/0715:18:12 10/17/07 (0)
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