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Old 15th October 2006, 03:19 PM   #11
Ron E is online now Ron E  United States
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That would depend on measurements, specifications or experience with particular materials. You could analyze a bunch of driver specs and extract a range of values and look for trends.
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Old 16th October 2006, 03:56 PM   #12
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Dear Ron,

Thank your for your help. Eric
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Old 1st November 2006, 02:04 AM   #13
palesha is offline palesha  India
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Hi p-eric,
I hv sent u one message. I got automated chinese reply by email.
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Old 1st November 2006, 02:50 PM   #14
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Hi- Palesha
I am sorry. I didn¡¯t receive your message, pls send again.
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Old 1st November 2006, 05:01 PM   #15
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I hv resent the message.
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Old 2nd November 2006, 03:08 PM   #16
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I have received,thanks.
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Old 2nd November 2006, 03:30 PM   #17
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Quote:
Originally posted by claudio
Hi,
knowing the T/S parameters BL=2,51*(Fs*Re*Mms/Qes).
That looks a nice easy way, can you point me to the source of the formula?
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Old 2nd November 2006, 04:54 PM   #18
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Qes = 2*pi*Fs*Mt*Re/(BL)^2
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Old 2nd November 2006, 08:03 PM   #19
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Ron, what is Mt?
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Old 2nd November 2006, 11:18 PM   #20
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It's a typo of sorts:

Mdt = lumped total mass = Md (diaphragm mass) + Ma (air load on both sides of diaphragm - all series masses).

Mms in some contexts is just the diaphragm, but it really is somewhat arbitrary and depends on how you define it. You could say Mms = Mmd (diaphragm) + Mma (airload). I often use Mdt and Mms interchangeably.

You can figure it out by knowing that:
Vas = 1.18*345^2*Sd^2/((2*pi*Fs)^2*Mdt)

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