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A Question About the Alpha 8 [message #50503 is a reply to message #50494]

Wed, 10 January 2007 06:55

FredT
Messages: 704
Registered: May 2009

Illuminati (1st Degree)

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.

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[Message index]

		Pi Studio One Tower By: FredT on Tue, 09 January 2007 16:40
		Towers and speakers on stands By: Wayne Parham on Tue, 09 January 2007 20:34
		Re: Towers and speakers on stands By: Matts on Tue, 09 January 2007 20:54
		Re: also... By: Matts on Tue, 09 January 2007 21:03
		Using side wall bounce to counter floor bounce By: Wayne Parham on Tue, 09 January 2007 21:25
		Two Woofer One Pi Tower By: FredT on Wed, 10 January 2007 04:25
		Re: Two Woofer One Pi Tower By: Wayne Parham on Wed, 10 January 2007 10:16
		A Question About the Alpha 8 By: FredT on Wed, 10 January 2007 06:55
		Re: A Question About the Alpha 8 By: Wayne Parham on Wed, 10 January 2007 10:12
		Re: Pi Studio One Tower By: LAL on Wed, 10 January 2007 09:53
		Side Firing Sub By: FredT on Thu, 11 January 2007 04:44
		Correction By: FredT on Wed, 10 January 2007 15:06
		So..when will the dual kit come ? =) By: Steve H on Wed, 10 January 2007 20:33
		Re: Could be popular. By: Matts on Thu, 11 January 2007 12:42
		Xover thoughts... By: Steve H on Thu, 11 January 2007 20:16
		Re: Xover thoughts... By: Wayne Parham on Thu, 11 January 2007 23:45
		It Could Be A While By: FredT on Mon, 15 January 2007 03:52
		Re: Pi Studio One Tower By: dB on Sat, 13 January 2007 11:41
		Re: Pi Studio One Tower By: tomlang on Tue, 26 January 2021 16:28
		Re: Pi Studio One Tower By: Wayne Parham on Wed, 27 January 2021 09:45

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