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Yukon888

Heresy I with Type C crossover - recommended upgrades?

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Hello, I’m new to the forum but not new to Klipsch. I’ve owned Forte’s, KG3’s, and now I have Klipsch Heresy I HWO12. 1973, according to serial numbers.

 

K77 tweeters

K-55-V squakers

K-22 and K-22-E woofers - yes, different woofers in each speaker. Not sure how that happened.

All of these drivers measured under 8 ohms

 

Crossover is Type C. Has 1uf and 2uf paper in oil caps.

 

I’m thinking that at the very least I should replace the almost 50 year old caps.  I checked Crites website and I don’t see Type C replacement crossovers. I would have purchased those if available. Can I go to another type of crossover, or should I just replace the caps on these crossovers?

 

Eventually, I might want to try the CT120 tweeters, and maybe even the A-55-G mid drivers.

 

I just don’t know what to do with these Type C crossovers.

 

One thing I think I had read in other posts is that the type C crossover might have been designed for 16 ohm woofers. Is this true? The woofers in these speakers measure under 8 ohms.

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Well, I've been doing a little more searching, and based on the following thread, I think I'm just going to replace the caps for now:

 

https://community.klipsch.com/index.php?/topic/172948-type-c-d-or-e-crossover-for-heresy-1973/&tab=comments#comment-2201974

 

The speakers sound pretty good but they seem to lack a little transparency. Hopefully new caps will "lift the veil".

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I'm also interested. I just bought a pair from '83, they sound good, but I have no idea what they sounded like new. I guess step one is to open them up and look inside.

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Well I decided to just start out by replacing the caps in the stock type C crossovers with new Sonicaps Gen I. I’m very happy with the results. The midrange and treble sizzle is now gone. There’s multiple more levels of clarity now. The soundstage is huge, and on some recordings the sound will creep along the side walls. 


When I had the back panels off, I put some of the Parts Express speaker gasket tape around the back to seal up the back panel. The bass now is very tight and articulate, even on a low watt tube amp. Absolutely no “boominess” in the bass. The bass is audible down to 40 Hz, which is just fine for my tastes most of the time. I have a powered subwoofer but I hardly ever have the desire to turn it on. 

 

These speakers just sound fantastic. They are so lively and engaging. They are my favorite speakers that I’ve ever owned. My last pair of speakers were KEF LS50’s. Those sounded good but they were boring compared to the Heresy’s. The KEF’s didn’t do well with tube amplification, they were only good with my solid state amp.


The Heresy’s are in a 13’ X 14’ room, powered by a SET amp with EL34 output tubes.


One thing I noticed when working on these is that one of the speakers is ¼” deeper than the other. The one that’s bigger uses ¾” thick motorboard vs ½” for the smaller speaker. I’m wondering if these were originally sold as single center channel speakers and then someone found two of them and passed them off as a pair. Either way, I’m not worried about it, as they sound so good.


Any comments from anyone are welcomed
 

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@Yukon888. Welcome to the forum. It would be good if we could see the serial numbers, that would help a lot. 
 

 

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Hi Oicu812. Thanks for the welcome. The serial numbers are 6L581 and 6L581. These numbers are on the label and also stamped into the back of the cabinet.

heresy (2).jpg

heresy (1).jpg

  • Thanks 1

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salut @ Yukon888 Bienvenue ici 😎

 

6L581 & 6L827  J'ai l'impression de lire sur la photo, mais je ne suis pas sûr du deuxième numéro 

 

See Jem capacitors for type C

 

 

 

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