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» Termpro Audio Forum » Installer's Corner » Advanced Topics » D*mn, I forgot the formula

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Author Topic: D*mn, I forgot the formula
Iknowuhearmecomin
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What value capacitor will let my 4-ohm speaker play everything 80hz & above!

Where could I pick up some on-line?

Thanks

PS

Please post the formula 2!
Posts: 31 | From: Chicago, IL. | Registered: Feb 2001  |  IP: Logged | Report this post to a Moderator
Audiophyle
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quote:
Originally posted by Iknowuhearmecomin:
What value capacitor will let my 4-ohm speaker play everything 80hz & above!

Where could I pick up some on-line?

Thanks

PS

Please post the formula 2!
497mfd capacitor

Parts Express, Select Products

--------------------
Love Always,
Mr. Negative

Murphy's law's apply to everything I say!
Posts: 3120 | From: nowhere | Registered: May 1999  |  IP: Logged | Report this post to a Moderator
Janne Ahonen
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Here's the formula:

C = 1/(2*pi*f*Z)

f is your crossover frequency, and Z is speaker impedance.

Multiply result with 1 000 000 to get result as microfarads.

(However, I don't like that simple calculation, driver is not resistive load, and it's impedance is not constant)

Regards,
Janne

--------------------
For box/port calculations, try these:

WinISD pro
WinISD classic
Posts: 44 | From: Kuopio, Finland | Registered: Feb 2002  |  IP: Logged | Report this post to a Moderator
Bass Freak
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480 mfd is the closest you'll find IIRC.

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Peace, Love, Bass.
Posts: 712 | From: UK | Registered: Sep 2001  |  IP: Logged | Report this post to a Moderator
Iknowuhearmecomin
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When installed does the cap induce any kind of noise or distortion.
Posts: 31 | From: Chicago, IL. | Registered: Feb 2001  |  IP: Logged | Report this post to a Moderator
toxicbass_1
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i prefer passive filters .

active ones are much better so i reccomend these.

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http://www.geocities.com/basshornguy
Posts: 503 | From: NZ | Registered: Sep 2003  |  IP: Logged | Report this post to a Moderator
   

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