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Experts, how do you figure out capacitor value for tweeter rolloff?

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Jon L

(i)

I'm experimenting with the Radio Shack Linaeum tweeters ( I bought six of'em!). I am currently using Bryston Active crossover, bypassing the crappy caps that came with them, and it works very well, but I need to try passively crossing them over. I'm using 4.5 KHz crossover point for my Bryston (upper limit), but I want to try running my own speakers full range (has Focal trioxide inverted titanium dome)and use the Linaeum as semi-supertweeter rolling off starting somewhere around 15K-20K range. I'm experimenting with various series/parallel configuration to get the best sensitivity/impedance compromise. Is there a formula to calculate capacitor value to do this? Thanks in advance!

Follow Ups:

Re: Experts, how do you figure out capacitor value for tweeter rolloff? � 18:51:45 05/29/00 (2)
The simple first order high pass formula is, Capacitor = 1 divided by, 2 times pi times cutoff frequency(Hz) times impedance of tweeter.
- Thanks. What are the units, though? Jon L 14:25:50 05/30/00 (1)
  Capacitance (in farads or microfarads?)= 1
  -------------------
  2(3.14)(Hz) (impedance)
  - Re: Thanks. What are the units, though? � 23:40:54 05/30/00 (0)
    A high pass for an 8 ohm tweeter at 10KHz would be 2 microfarads. A high pass for a 4 ohm tweeter at 8KHz would be 5 microfarads.
    �
Re: Experts, how do you figure out capacitor value for tweeter rolloff? Mike B. 16:28:07 05/29/00 (0)
http://www.globalnode.com/users/stevenr/spkrs/index.htm

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