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In Reply to: RE: "padded the level of the ... horns"? posted by Bill Fitzmaurice on May 27, 2023 at 12:52:23
Well, if I can't lower the output any more via the XO, what analog method(s) is preferred?
Follow Ups:
Or I suppose I could simply match the drivers, no? H woofer with H horn or J woofer with J horn? I'll investigate whether the H 8 ohm is superior to the J 16 ohm; go with one or the other. Also wonder whether simply changing the diaphragm from 16 to 8 will do the job.
No. No matter which driver you use horn loading makes it more sensitive than the direct radiating woofer. The only way to level match them is via reduction of the input voltage to the HF driver, by either an LPad or by bi-amping.
So, Bill, isn't my XO (3115A) doing just that, where this XO is designed to work with a low frequency impedance of 8 ohms and a high frequency impedance of 16 ohms?
You're looking at two entirely different concerns. Crossover components are chosen to deliver the desired crossover frequency and slope with the specific impedance of the drivers being used. That has nothing to do with level matching, which as I already said can be realized with an LPad or with bi-amping.
I see. But aren't the level controls included with the XO for that purpose (perhaps not in the same way, but have a similar effect)?
They are there for that purpose, though I would say -6dB is inadequate. Without seeing measured response it's only an educated guess.
as opposed to a Scientific Wild A$$ Guess! (SWAG)
Thank you for your insight Bill. More research to do.
You could use Crites 3636 auto formers to match the level of the horns to the woofers. You will need to use the correct parallel resistor to bring back the impedance seen by the network to the correct value.
You can find more information here (parallel resistor values would be the same with Crites autofiormers, assuming an equal attenuation):
LPad.
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