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SUPPORT FORUMS FOR DECWARE SPEAKER PLANS >> DECWARE Imperial support forum >> Imperials: matching throat, chamber size to driver
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Message started by tubino on 02/16/09 at 17:34:14

Title: Imperials: matching throat, chamber size to driver
Post by tubino on 02/16/09 at 17:34:14

Hey all,

I posted a series in the Audio Forum DIY speaker category, but really it could have gone here. I have tried a number of drivers in my 1952 Imperials, and have tried to understand some of the math/formulas too. If interested, please check this thread:

http://www.audiophiletalk.com/cgi-bin/yabb2/YaBB.pl?num=1234718168

The short version is that there is a formula for calculating throat dimensions, and the apparent matches/mismatches I found seem to correlate with subjective impressions. Most BLH throats are too large for the drivers! The same seems to be true with compression chambers, which ought to be a lot less than the driver Vas to get compression prior to the throat.

I believe one could do a more efficient search for the right driver by going this route. I'm currently using an Altec 515E with earth-shattering results.