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In Reply to: RE: Altec 416z remag/recone/replace posted by Scott L on January 21, 2016 at 04:12:44
I found it can be calculated BL= Sqrt(2*pi*Fs*Mms*Re/Qes)
My calcs show a BL of 22 which I think is good. So no recharge is in my future.
Edits: 01/21/16Follow Ups:
BL=(2*Pi*Fs*Mms*Re/Qes)^1/2 That last missing part of the equation would alter your BL product of 22 considerably.Also, Altec's spec sheet shows a BL of 16 for the 416-8B, which is arguably the best sounding version of that speaker. Of the ones I have sitting around, they all seem to measure between 15 and 18 on a Woofer Tester 2, which you mention that you have used. Rather than calculate BL, why not just read the number off the results page. You used the numbers from WT2 for calculating anyway.
Edits: 01/21/16
Yeah, I meant "sqrt" to be square root.
I did read them off the results, but the bl was higher than expected, so I ran the calc and got to the same place.
The 416Z is 16Ω, so the Bl should be 1.414 times the 8Ω version.
is for Fools Alnico doesn't need rechgarging unless they have been abused to the point where their voice coils have vapourised.
But urban myths and naive folks seem to flock together... a marriage made in Salesman's heaven.
I mentioned nothing about recharging, but since you bring it up............
Only a fool would not have a dropped Alnico compression driver re-charged.
So, did they BOTH measure the same ?
The t/s parameters that govern the BL calc were close when I measured them a bit ago using a partsexpress W-2.
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