How to calculate the BL of driver
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 15th October 2006, 03:19 PM #11 Ron E   diyAudio Member     Join Date: Jun 2002 Location: USA, MN 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. __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Armaments, universal debt, and planned obsolescence--those are the three pillars of Western prosperity. —Aldous Huxley
 16th October 2006, 03:56 PM #12 p_eric   diyAudio Member   Join Date: Jul 2006 Dear Ron, Thank your for your help. Eric
 1st November 2006, 02:04 AM #13 palesha   diyAudio Member   Join Date: Nov 2001 Location: Pune India Hi p-eric, I hv sent u one message. I got automated chinese reply by email.
 1st November 2006, 02:50 PM #14 p_eric   diyAudio Member   Join Date: Jul 2006 Hi- Palesha I am sorry. I didn¡¯t receive your message, pls send again.
 1st November 2006, 05:01 PM #15 palesha   diyAudio Member   Join Date: Nov 2001 Location: Pune India I hv resent the message.
 2nd November 2006, 03:08 PM #16 p_eric   diyAudio Member   Join Date: Jul 2006 I have received,thanks.
richie00boy
Did it Himself
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Join Date: Nov 2003
Location: Gloucestershire, England, UK
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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 2nd November 2006, 04:54 PM #18 Ron E   diyAudio Member     Join Date: Jun 2002 Location: USA, MN Qes = 2*pi*Fs*Mt*Re/(BL)^2 __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Armaments, universal debt, and planned obsolescence--those are the three pillars of Western prosperity. —Aldous Huxley
 2nd November 2006, 08:03 PM #19 richie00boy   Did it Himself diyAudio Member     Join Date: Nov 2003 Location: Gloucestershire, England, UK Ron, what is Mt? __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, modules and more.
 2nd November 2006, 11:18 PM #20 Ron E   diyAudio Member     Join Date: Jun 2002 Location: USA, MN 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) __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Armaments, universal debt, and planned obsolescence--those are the three pillars of Western prosperity. —Aldous Huxley

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