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I was not aware but apparently the electrical impedance of a 4ohms woofer becomes 8ohms when it's loaded in a front loading folded (or unfolded?) bass horn
I suspect it happens with all similar horn shapes, and if I use Peavey FH-1 instaed of my LaScala bass bins, all other things being equal, I don't need to modify the crossover networks? The impedance seen by the network will be the same as with the woofer in the LS bass bin?
Follow Ups:
I uploaded the impedance with stock Peavey woofer in 2006 but Imageshack lost their copy and mine is gone. There was not a lot of rise due to the horn. IIRC, it had a single primary resonance peak around 60Hz, smooth afterwards and from a 2006 comment, something like a 6 ohm impedance around crossover.Here is Peavey's data sheet in pdf
K33 is pretty close to Peavey other than the Peavey having lower qts - there won't be much difference in the horns. My ~81 K-horn K33E qts is over 0.4
here are the nominal specs for Peavey's old 1504-4dt in this blurry image
Karlson Evangelist
Edits: 07/30/16 07/30/16
Peavey did use a 4 Ohm woofer in the FH1 and sold it as an 8 Ohm box. I questioned that back in the days when we were a Peavey dealer.
That's the story we were given. The woofer with horn loading averages about 8 Ohms at the frequencies it is used at.
Horn loading does increase impedance, but not by a set figure or percentage. It varies with every horn and driver combination, and so will the crossover.
Peavey FH-1 and Klipsch LaScala only have very minor design differences... Klipsch long used the exact same network for the Khorn, the Belle, and the LaScala... I guess it's safe to say I can use the same crossover?
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