Posted by FredT [ 72.177.182.50 ] on January 10, 2007 at 07:55:30:
In Reply to: Towers and speakers on stands posted by Wayne Parham on January 09, 2007 at 21:34:17:
I'm wondering how near the TS parameters for this driver are to the advertised specs, which appear to have been changed within the past couple of years. Here's a comparison of the specs on the Parts Express 2005 catalog versus the 2006 catalog (I understand the change was actually made before 2005 but wasn't reflected in that catalog):
Parameter - Old/New
LE - .65mH/.44mH
Fs - 76/73
SPL - 97/94
Vas - 0.5/0.6
Qms - 4.5/4.6
Qes - .6/.68
Qts - .53/.59
I'm not suggesting that WinISD always yields the optimum solution, but when I enter these different parameters, for the old parameters the software suggests a ported 1.23 cu ft box tuned to 57.5hz. For the new parameters I get a 2.1 cu ft box tuned to 49.5 hz. The F3 for the old alignment is 51hz; for the new one its 44hz. Quite a difference.
[ PiSpeakers Forum ] [ Help ]