I was modeling my M8a box's with a 4" flared vent to tune them to 32 hz. Assuming the internal volume is 50 liters I get a vent that is supposed to me 15" long. Now its been awhile since I've used a flared vent but I seem to remember that I need to adjust that lenght due to the flares? Also how much room do I need to leave between the front of the flare and the front baffle? I think its 2" minimum based on a 4" port but I've been wrong before
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Andrew,
IIRC, when using the flared ports you should add 1" to the total length that is required for a non-flared port. Also, the general rule is that a 4" port should be 4" from the opposing wall.- Bottom
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Brian's suggestions are sound. :LOL:
The original M8a design, which uses an actual internal volume (once you subtract for drivers, braciing, the port, etc., of about 35 liters, uses a 3" flared port, about 10" long. There's nothing to be gained using a 4" port, as the port velocity which can be produced by the maximum Xmax of the M8a driver isn't high enough for it to be a concern. Smaller than 3" would be a problem.
Use Unibox with Excel 2K or XP to confirm the tuning for your particular enclosures.
Best regards,
Jon
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