Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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very well put

155.218.56.95

Posted by Mart on May 10, 1999 at 02:13:24

In Reply to: Some simple math posted by abc on May 10, 1999 at 01:37:03:

I just was letting him be also aware that the Speakers "Qes" is proportional to "Re/BL^2"

but in reality the "Re" includes the "Rg" (resistance of everything between the amp and the woofer). Thereby:

Qes = c1*(Re + Rg)/BL^2
Qts = Qms /( 1 + Qms*BL^2/c1*(Re + Rg) )

Given a generic woofer:
BL=10
Qes=1/2
Re=5
Qms=10

Rg = .114 translates into a 2% increase in Qts
Rg = .75 translates into a 14% increase in Qts

This may be enough to significantly change the required box size & other sonic characteristics.

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