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review of B&K Sound (Bob Crites) Forte I crossover


jpc2001

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Factory Forte I crossover measurements:

 

Series resistance of the 3.0mH inductor is 3.0ohm

The 47uF bipolar electrolytic measures 51uF (not bad, did it take a DeLorean here from 1985?)

Series resistance from pin 0 to pin 2 on the autoformer is 0.7 ohm. From pin 0 to pin 5 is 1.1ohm.

 

Crites crossover:

 

3.0mH inductor: series resistance is 1.6ohm

The 47uF bipolar electrolytic measures 54uF. We can't blame B&K sound, they use a 5% part. Is my DMM accurate?

Series resistance from pin 0 to pin 2 on the autoformer is 0.5 ohm. From pin 0 to pin 5 is 0.8ohm.

 

Wish I could measure the ESR of the smaller caps, maybe that's where the added "air" of the new crossover comes from. And there is air! You might expect the new crossover, with its lower-parasitic woofer inductor, to tilt the sound toward the bass end. But the most obvious effect is it sounds airier, like there's more treble extension and better definition HF transients. A stock Forte sounds a little "syrupy" next to the modded one, the modded one sounds brighter. But enough subjectivity.

 

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