Plastic mid/tweeter enclosures?

trunkmonkey · 19th January 2006, 05:25 PM

Comments on molded plastic enclosures such as the one below appreciated. Should they be used. If so why do commercial setups not use them.

Curmudgeon · 19th January 2006, 07:44 PM

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.

trunkmonkey · 19th January 2006, 08:08 PM

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.

AJinFLA · 19th January 2006, 09:07 PM

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:
http://manuals.harman.com/INF/HOM/Te...%2050%20ts.pdf
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?

Cheers,

AJ

Curmudgeon · 19th January 2006, 09:08 PM

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.

influx · 19th January 2006, 11:11 PM

Quote:

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:-)

19th January 2006, 08:08 PM	#3
trunkmonkey diyAudio Member Join Date: Jan 2006 Location: Winnipeg	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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19th January 2006, 07:44 PM	#2
Curmudgeon diyAudio Member 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.

19th January 2006, 09:07 PM	#4
AJinFLA Banned 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: http://manuals.harman.com/INF/HOM/Te...%2050%20ts.pdf 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? Cheers, AJ

19th January 2006, 09:08 PM	#5
Curmudgeon diyAudio Member Join Date: Nov 2005	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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