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I bought a pair of Heresy I’s in 1979 in college that have been w/ me ever since. Type E crossovers, K77 tweeters, K55-V squeaker drivers w/ K700 horns and K-22-E woofers. I replaced the K77s w/ new ones from Klipsch about 20 years ago when I blew them and I replaced the binding posts at the same time so I could use banana plugs and lower gauge speaker cable. Otherwise everything is original. I don’t hear any obvious problems with them, but I want to restore them to their former glory or better. I’ve been reading everything I can find here and at Crites and at ALK but I still have many questions and would appreciate advice. 1) I know I need new caps and since I don’t solder, I plan to replace the crossovers. I could use Crites Type E, which uses the same spec as the original, or ALK’s universal CSW which have some upgrades. A few questions about that: - I understand what Al says about constant impedance and no resistive error, but I don’t use an SAT amp so does that matter to what I hear? - Also, the Type E only uses a low-pass inductor for the woofer. The squawker and the tweeter use high-pass capacitors in parallel, so (if I understood Al’s site) high freq sounds that should only go to the tweeter go to the squawker too. Does that matter? Would it matter if I replaced the K77 tweeters w/ Crites CT120s? - Are the actual crossover frequencies the same between the two networks? It looks like maybe there is some adjustment possible on the CSW but I’m not sure. 2) Is upgrading the K77s to CT120s a good idea? 3) I know I need to replace the gasket between the squeaker driver and the squawker horn, but does it also make sense to upgrade the K-55-V with a Crites A-55G? Do squawker drivers wear out and/or is the A-55G a lot better? 4) Crites offers CW1228 woofers as drop-in replacements For the K-22-E. Are they better, especially given that the K-22-Es are 40 years old? Or what if I just rotated the K-22-Es 180 degrees as I read somewhere? Sorry about so many questions - I’ve read a lot on my own and I’m still not clear on the best way to do this. There is tremendous expertise here and I’d be grateful to tap into it. Thanks in advance
Yesterday, I was swapping back in the K-77-D tweeters into my La Scala II's after running CT120's all Summer. Noticed some of that sshhhh sibilance that I remembered on the stock La Scala II's. But this time, I have REL along with a calibrated UMIK-1 in my toolkit. Did some measurements and comparisons. SPL graphs looked normal for K-77-Ds. Then I hit the distortion button on REL and the graph the left K-77-D looked out of whack compared to the right. Notice the distortion peak on the left tweeter starting at the crossover point 4500hz. Re-checked all my connections - still the same. Removed the tweeter and checked it alone - distortion still there. Removed the four screws and separated the magnet assembly from the horn, reseated the bug screen and gasket, blew some air in there, tightened everything back down, and distortion is gone. Wonder if the bug screen wasn't seated properly and was resonating? (Looked at my REL data from a few months ago, and the distortion was present back then so I wonder if this was my problem with the K-77-D all along....) Everything is buttoned back up and sounding great. Going to run the stock K-77-D's again now for a while. Anyhow, I hope this info helps somebody.
I just purchased new La Scala II's . I am a long time Klipsch fan and I have some experience with La Scala's. I thought that perhaps a new Crites CT120 tweeter might be a sonic upgrade for the stock tweeter. I already have these tweeters waiting to install. I also ordered Bob Crites new A-55G driver. I find the midrange too shouty and I'm hoping this new driver helps improve things. I had La Scala I's back in college for 2 weeks and returned them for Cornwall II's due to the LS's lack of deep bass and shouty midrange. I still have the Cornwalls. With the advent of subwoofers obviously the bass issues aren't a problem and I love the LS midbass. Anyway, I was thinking of swapping out my stock 401 horn for the wooden tractix Fastrac horn. I'm hoping it will also improve sound and by being much shorter than the stock horn I would not need to enlarge the hole in the back of the La Scala to accomadate the larger A-55G. Does anyone here have thoughts, ideas or experience with these modifications? I know I'm messing with PWK's sacred designs so I hope I don't get jumped on but I know what sounds right to me. I've always loved the design of the La Scala's and I'm committed to making this purchase work for me.