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Wayne... C5 [message #34673] Wed, 09 January 2002 11:26 Go to next message
Adam is currently offline  Adam
Messages: 419
Registered: May 2009
Illuminati (1st Degree)
In the crossover diagram you show C5 as this

C5=Le/Re^2

Now the Kappa 15lfa has Le=1.27 mH and Re=5.4 ohms.
so....
C5=1.27/29.16
C5=0.0435 uF

This seems really inconsistant with any of the C5 values listed in your crossover diagram. They are all at least 20 uF.

What am I doign wrong?

Thanks

Adam

Re: Wayne... C5 [message #34674 is a reply to message #34673] Wed, 09 January 2002 12:01 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18682
Registered: January 2001
Illuminati (33rd Degree)
You are forgetting that millihenries are a thousandth of a Henry and that microfarads are a millionth of a Farad. So C5 should be 4.35 x 10-5 Farads or 43.5uF.
Re: Wayne... C5 [message #34686 is a reply to message #34674] Thu, 10 January 2002 14:24 Go to previous message
Adam is currently offline  Adam
Messages: 419
Registered: May 2009
Illuminati (1st Degree)
Dah... Alright thanks man!!!

My parents are gonna be returning some money they owe me tomorrow and then I'm off to the store to pick up four sheets of MDF to build the two speakers. These suckers are gonna be heavy!!!

I've got the inductors and some caps I need but I have to order mills resistors and some other parts from Parts Express before I can finsiht hem up. I might substitute in some cheap wirewounds and some electrolyte caps until those parts arrive. I'm gonna use four 12 watt mills resistors in parallel for 48 watts power handling on all circuits (although will the impedance compensation on the woofer need it?) and I am going to strap them to heat sinks as well.

Adam

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