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16 ohm JBL 2226J [message #93341] Sun, 21 March 2021 19:04 Go to next message
Jetpump is currently offline  Jetpump
Messages: 6
Registered: July 2020
Esquire
Hi Wayne,

Do you have a 4pi crossover design for using a higher impedance woofer? I'm interested in using this design for a 300B SET amp and read somewhere that the higher impedance woofer would work better.

Thanks,
Billy
Re: 16 ohm JBL 2226J [message #93343 is a reply to message #93341] Sun, 21 March 2021 22:33 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18148
Registered: January 2001
Illuminati (33rd Degree)

Sorry, but I don't have designs that use the JBL 2226J. A few people have scaled the crossover components to use 16Ω drivers - and that might work - but I haven't validated it with acoustic measurements. To do this mod requires doubling the coil values and halving the capacitors and the Zobel resistor. You also need to reduce the tweeter by 3dB, so the R1/R2 values must be changed.

To be honest, though, I'd prefer 8Ω speakers run on the 8Ω tap. An SET 300B has plenty of power for the four Pi, and yet that extra few decibels of voltage sensitivity from the 8Ω load is useful.

So if you don't already have 2226J drivers, get a pair of 2226H and a pair of DE250-8 drivers and build the four Pi speaker as designed. You'll be very pleased with them on a 300B SET amp.
Re: 16 ohm JBL 2226J [message #93344 is a reply to message #93343] Mon, 22 March 2021 05:35 Go to previous message
Jetpump is currently offline  Jetpump
Messages: 6
Registered: July 2020
Esquire
Thanks Wayne! I'll shoot for the 8 ohm then.
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