Hales Revelation 3 Crossover Help

This speaker uses 4th order crossovers with all film on top. The concept that Erik is referring to should not happen with smaller tweeter caps when only tweeter caps are replaced.

Pretty much true, though I could imagine if a zobel or notch filter was employed it might.


I was referring to the general use in a low pass filter. Ideally you'd use something like DATS to measure the speaker impedance and that of the components that were removed. That would give you a definitive answer.



Best,

E

PS - Based on the STereophile measurements here:

https://www.stereophile.com/content/hales-revelation-three-loudspeaker-measurements

That speaker is already very difficult to drive. Even small variations can perturb it further. Also, because it’s such a difficult speaker, I would have done a complete analysis first, to see if there are opportunities to improve the impedance curve while maintaining the frequency response. Old Gensis / Infinity speakers notoriously benefit from this type of work.

Hahahaha. Hahahhaah. Hahahhaa.

I’m laughing because I may be the only person on earth who knows what happened, because most modern speaker designers have never seen it.

What he probably did was swap out electrolytics for film (a good thing) that were parallel to the woofer. As a result, he lowered the ESR without compensating with the appropriate resistor.
If they are gone, measure the speaker impedance and compare to the Stereophile measurements. You’ll see a gnarly dip. Add R until that goes away.

If you can do neither, add R in 0.5 Ohm increments. Usually you want around a total of 1.5 to 2 Ohms (existing resistor + ESR).

You owe me a bottle of tequila.

Best,

E