(Scroll down or click here to go directly to the database.)

For woofers, generally we will provide basic Thiele-Small data, including, but not necessarily limited to Fs, Qms, Qes, Qts, Vas, Cms, Mms, BL, Re, and Sd.  Note that many sources do not provide Sd or Cms:  Without one of those two, in addition to the rest of the data, you can predict response, but not efficiency / sensitivity of a driver.  (We suspect this omission may often be deliberate!)  Often, we will also provide a response curve, though in the case of many subwoofers, the useable response is pretty much “covered” by the T-S predictions up to 200 Hz.  (Put another way, above 200 Hz, and sometimes above 100 Hz, “forget it”, for most large subs.)  Conversely, we do not always have an ideal cabinet around for large woofers, so, usually the best bet is to use the T-S data in your modelling program to see what the low end will be like.  Besides, your woofer cabinet and one we would have around are almost certainly going to be different:  That’s another reason to use the T-S data and not an arbitrary result on the low end with a cabinet we picked out…  Note also that we just plain don’t have curves on many older drivers that we DO have T-S data on.

In the case of tweeters and small mids, we will provide curves, usually at various listening angles, but of course we generally will not attempt to provide T-S data on tweeters.  When an impedance curve is noteworthy for some reason, we will include it.

We also invite visitors with good data on drivers to submit it to be posted here (credit will be given to individuals submitting data.) 

*We decided to call this area of the site the “Dept. of Corrections” because we have found so much inaccurate information and data/specifications ”out there”.  Where data merely seems to be “off” a little, we will simply point out the discrepancies.  In some cases, we may have a guess as to why the inaccuracies exist.  See also our discussion (soon to be discussions) on loudspeaker measurement accuracy.)  Where data has been purposely exaggerated, however, we will have little mercy on the perpetrators!  We take the provision of accurate information very seriously, and expend considerable effort, cost, and expertise in doing so.  If we can do it, so can much larger operations.  Unfortunately, while many do, many more do not. 

Without further ado, we present the beginning of our database:

Latest Driver Additions:

 
Acoustic Audio AABASS12  (Hilariously overrated(!) but actually a decent inexpensive woofer.)
Goldwood GW-12PC/4
Goldwood GW-12PC/8
Audax HD13B25H (5.25-inch) (old data)
Audax HD20P34HSC (8-inch) (old data)
Audax HD20P34HSM (8-inch) (old data)
Audax HD20P34KSC (8-inch) (old data)
Crunch CR108 (old data)
Crunch CR124 (old data)
EV Force 10 (old data)
Lanzar OA-104 (10-inch)
M&K Z121TV8 (12-inch)
Quart QM-300 (12-inch)
MTX PLY-12 (old data)
MTX PLY-15 (old data)
Soundstream Granite 15 (old data)