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Need values for 4-pi x-over for 2226J (16 ohm) [message #52471] Sat, 16 August 2008 10:15 Go to next message
spkrman57
Messages: 522
Registered: May 2009
Illuminati (1st Degree)
Wayne,

I can figure out the values for the LF circuit except for the zoebel cap value.

I know I will use 15 ohm resistor, but what value does the zoebel change to since the zoebel is run on the "light side" compared to normal?

I have most of the parts ready and will start building the crossovers after this weekend.

I will have the LF sections and HF sections of the crossover separate from each other since they will be connected to the appropriate impedance taps of my McIntosh 240 amp!

That way, there will be no loss of efficiency of the 16 ohm 2226 and the 8 ohm top end 902/650hz Edgarhorn.

Regards, Ron

Re: Need values for 4-pi x-over for 2226J (16 ohm) [message #52473 is a reply to message #52471] Sat, 16 August 2008 11:57 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18791
Registered: January 2001
Illuminati (33rd Degree)

If the load impedance doubles, the the coil sizes double and the cap sizes are halved. I realize you knew this already, but thought I'd mention it for other readers. So the values for a JBL 2226J are:

L2 3.0mH
L3 1.0mH
C4 10uF
C5 10uF
R3 16Ω

Remember that voltage sensitivity drops by 3dB. In other words, an 8Ω JBL 2226H will be 3dB louder than a 16Ω JBL 2226J driven at the same voltage. So you'll want to attenuate the tweeter by that amount to compensate.


Thanks Wayne! [message #52474 is a reply to message #52473] Sat, 16 August 2008 12:35 Go to previous message
spkrman57
Messages: 522
Registered: May 2009
Illuminati (1st Degree)
Also you mentioned:

"Remember that voltage sensitivity drops by 3dB. In other words, an 8Ω JBL 2226H will be 3dB louder than a 16Ω JBL 2226J driven at the same voltage. So you'll want to attenuate the tweeter by that amount to compensate."

Which is good for others to note. However I have 4 ohm, 8 ohm and 16 ohm taps on my MC-240 tube amp and can match the impedance to the appropriate taps for the HF and LF sections which results in no additional loss in efficiency.

Thanks!

Regards, Ron



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