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In Reply to: RE: Bypassing Speaker Caps posted by Paully on July 16, 2007 at 06:58:46
Sorry if my explanation below wsn't clear. I asumed you knew the rules for how resistors combined.
Now it all is a function of how many dB the crossover is but for a second order (12dB) there would be a series cap to a tweter and a shunt inductor across it. For the woofer the inductor would be in series and the cap in shunt (shunt means across the driver terminals). In general put your money into the series parts and save on the shunt parts.
Also be advised that a film cap is going to tend to sound brighter so that might not be a good thing on a klipsch tweeter or mid range as they can sould a tad aggressive already. Real point being, to make one change at a time and keep the old parts. Listen for a week or two and then put the old part back in to be certain you like the change. Don't be afriad to scroung old motor run caps, from discarded air conditioning units and the like, as a cheap source for large film caps. Plus they have somewhat more delicate sound sometimes.
Russ
Follow Ups:
It is for the Klipsch, and I do understand the part about adding resistors so I was surprised by the capacitor answer. One of those things that I just couldn't wrap my mind around.
Thanks for the suggestions. I think I might build the crossover in a seperate box to be able to do the changes bit by bit without always having to get into the speaker. Apparently some of the coils are too close together and need to be seperated anyway.
About the worst possible place for crossover parts is inside a speaker cabinet! Not only will it be easier to work on but I bet it will sound better not having to deal with all the sound pressure waves and vibration.
You have done your homework I see and made a wise choice. The Cornwall is about the only other one I'd rather see you have....besides the two other (unamed) ones that are way too big and costly:)
Pay attention to the DCR of the inductors (coils) as they are often part of the crossover design. I know in some of the Klipsch speakers they used oil caps in big metal cans. If you have those I'd keep them. IIRC some had transformers with taps and for sure you want to hold on to them too. And keep in mind what Tom said about Remora's:) You might want to start with damping the horns themselves.
Now you need a top notch turntable.....or reel to reel....LOL...It is a sickness you know!
Russ
The more I get into it. Got the amps, got the speakers (though I have my eye on a pair of Fostex that I might add to the collection though they will be the last Fostex I audition if I don't like them), next is the turntable. Probably a VPI or that direct drive that all the DJ's use which name escapes me for some reason.
The Klipsch guys say to upgrade the caps and resistors but not to touch the inductors on the Chorus II. And thanks for the compliment, I read a great deal and the Chorus II seemed to have the quality, and importantly, the size considerations I needed.
I am not familiar with DCR.
DCR is the series resistance component of the complex impedance of the inductor. This is really a non-linear system due to more than just the hysteresis of the iron core, but it is satisfactory to model it as a series combination of resistance (DCR) and inductance (Le).
Jeff Robinson
It is just something that has to be taken into account in the crossover design. Sometimes it is overlooked when guys want to upgrade with something better.
Russ
P.S. You will be happy with Mills resistors:) I don't know what size caps you need so until then...
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