Plastic mid/tweeter enclosures? - diyAudio
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Old 19th January 2006, 05:25 PM   #1
diyAudio Member
Join Date: Jan 2006
Location: Winnipeg
Default Plastic mid/tweeter enclosures?

Comments on molded plastic enclosures such as the one below appreciated. Should they be used. If so why do commercial setups not use them.
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Old 19th January 2006, 07:44 PM   #2
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Join Date: Nov 2005
Long ago, Vandersteen did; it was a cone that was designed to match a Vifa? Seas? midrange. The mid and or tweet should have their own back sealed boxes, to prevent the woofer-induced cabinet pressure from modulating them. If the volume is correct for the LF end of the mid, there is nothing wrong with using the plastic; I'd add a damping (water based only) glop, and felt the inside to reduce vibration and reflection. From what I can see from the picture, they would be suitbable for a fairly high bass/mid crossover freq and a relatively small mid.
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Old 19th January 2006, 08:08 PM   #3
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Location: Winnipeg
Default vifa/seas/audax

The picture is a Vifa cover. Solen carries covers for Vifa, Seas and Audax. I agree with your point about preventing modulation but would like to know why most commerical cabinets do not use this type of enclosure.
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Old 19th January 2006, 09:07 PM   #4
AJinFLA is offline AJinFLA  United States
Join Date: Feb 2005
Location: Tampa
How do you know that most commercial speakers with midranges don't use a back cup? I honestly don't know what the insides of most boxes look like, because I really wouldn't care. Here's at least one:
part# 18. I posted this because I knew Harman had specs on their site readily available. I suspect most would have something similar for their mids, but who knows?


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Old 19th January 2006, 09:08 PM   #5
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For mids, the enclosure volume is critical, as it determines the driver LF response (without crossover). This will be a crossover pole, and it's pretty convenient to add a wood/mdf box in a wood/mdf cabinet that is exactly the right size to get that pole placed at the right frequency. I used slanted back boxes for the mid.

Many tweeters are self enclosed.
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Old 19th January 2006, 11:11 PM   #6
influx is offline influx  United States
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Originally posted by Curmudgeon
Long ago, Vandersteen did......
Not as uncommon as you would think! This is mid driver from a Scott speaker circa 1968. Scott used this driver config w/enclosure in at least 5 models that I know of. I'm restoring a pair of S-11D's with a damaged mid cone and trying to find a replacement pair.

Driver replacement, just the FAQ's mam (ahem, men:-)
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