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# DIY Audio Projects Forum

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 Post subject: T/S parameters error??Posted: 10 Nov 2018, 09:31

Joined: 10 Nov 2018, 09:29
Posts: 1
Hello lovely people!

I recently decided to try and measure T/S parameters for an undocumented loudspeaker as per this method:
http://sound.whsites.net/tsp.htm

However, when I use a calculator for a box it states it needs to be about 400 litres, which is impossibly large. Are my calculations off?

Speaker is 20W 4.5".

Re=7.6Ohm
Rs=8Ohm
Vs=1V
Fs=116Hz
Vm=0.169V
Im=0.021A
Rm=39.6Ohm
r0=2.5
Ir=0.033A
Vr=0.264V
Fl=102hZ
Fh=130hZ
Qms=6.55
Qes=2.01
Qts=1.54
Fs1=69Hz
M1=5grams
A=63.585
M=2.669
d = density of air = 0.001204 g/ml
c = speed of sound = 345 m/s
Cms=7.060187e-7
Vas=4.089lts

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 Post subject: Re: T/S parameters error??Posted: 13 Nov 2018, 21:12
 Editor

Joined: 28 May 2008, 21:53
Posts: 4592
Hello, welcome to the forum.

Qts=1.54 so these speakers are meant to be use open baffle, open back speakers. A high Qts would be common for car speakers and in the case of vintage speakers with an open back enclosure or in a radio/phono console. The speaker magnet on a high Qts driver will be small relative to the driver.

Hope this helps.

_________________

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