hap Posted April 18, 2013 Share Posted April 18, 2013 Would ESS Heil AMT tweeters be plausible/possible replacements for my Heresys' horn tweeters? To our aging ears the Heresy tweeters seem to squak more than tweet... If so, would I need a re-configured crossover or would the tweeter replacement be a "simple" drop in? I have the Bob Crites replacements x-overs. We have a smallish listening room, a Will Vincent ST-70 amp and listen mostly to classical music via CD/DVD and satellite. Any thoughts, ideas, opinions will be greatly appreciated... MTIA Harry Freiberg Brookings, OR Quote Link to comment Share on other sites More sharing options...
Daddy Dee Posted April 18, 2013 Share Posted April 18, 2013 Harry, That's a very interesting question about the AMT's. Years ago had a roomate who owned a pair of towers with those tweeters and thought the sound was good. Think they could work, but wouldn't be any help at all about what would be needed in terms of a crossover. Don't know what kind of a match they would be to the compression driver in the mids. I think with your system it would be worth considering Bob's CT-125 tweeters. They are a (physically and electronically) drop in replacement for the K-77. Have used these tweeters for several years and thought they bested by a long shot the Beyma CP25 so many people talk about. In terms of sonic realism they are the real deal, IMO. one more thought, if you do use the CT-125's it's a pretty simple crossover mod to cross from the mid to tweeter at 4500hz instead at 6000hz. I've done that with Khorns, LaScalas and Heresys, all with CT-125's. To my ears the improvement is pleasing. I forget the values, but the crossover changes involve adding an inductor and changing the value of a cap. Can't remember the values right now, but others would, i'm sure. or check with Bob. btw, i'm a huge fan of Will Vincent and his builds. they really are better than new and near works of art, imo. Quote Link to comment Share on other sites More sharing options...
Quiet_Hollow Posted April 18, 2013 Share Posted April 18, 2013 To our aging ears the Heresy tweeters seem to squak more than tweet... [^o)] Please elaborate... Quote Link to comment Share on other sites More sharing options...
hap Posted April 18, 2013 Author Share Posted April 18, 2013 I neglected to say that we do have the Crites tweeters. For more than a few years we were pleased, but not so much now. As I implied, maybe we're getting old and losing our "golden ears"... Re Will Vincent: his amp is the first (and only) piece of audio equipment that has passed the WAF test with flying colors. The SO has been know to dim the lights when listening to enjoy the glow... Many thanks. Quote Link to comment Share on other sites More sharing options...
hap Posted April 18, 2013 Author Share Posted April 18, 2013 Violins, flutes, female choruses, some male tenor voices are strident, especially when played/sung loudly. Not so much at less than forte. String quartets and trios stll sound quite nice. The rub is we (well mostly the SO) are opera and mass fans and are finiding more and more of our library less than pleasant to listen to. Maybe our ears are getting old, along with the rest of us... Many thanks. 1 Quote Link to comment Share on other sites More sharing options...
Quiet_Hollow Posted April 18, 2013 Share Posted April 18, 2013 Violins, flutes, female choruses, some male tenor voices are strident, especially when played/sung loudly. Not so much at less than forte. String quartets and trios stll sound quite nice. When is the last time that the midrange driver-to-horn gaskets were inspected / replaced? How about checking the six machine screws on the midrange driver itself for tightness? I ask because I experienced a similar issue with my La Scala last year... Please see : http://forums.klipsch.com/forums/t/154630.aspx?PageIndex=2 When the driver gaskets harden up, they leak. When the horn leaks at the throat, the diaphragm unloads and distorts. The problem manifests audibly as "grit", for lack of a better word. The subsequently reduced midrange output in addition to the distortion will make the treble sound abnormally hot and nasty. The tell tale here is: Do you find yourself, or the SO, listening the system a touch louder (from where the volume knob or VU meter typically is) than you can recall in the past? Bob Crites stocks the correct o-rings for a couple bucks shipped. I highly recommend taking a look into them instead of throwing money at entirely new drivers. Simply fresh gaskets and tight screws can make a BIG difference in the sound. -QH Quote Link to comment Share on other sites More sharing options...
Daddy Dee Posted April 18, 2013 Share Posted April 18, 2013 OK, understand. since you are wanting to move on from the CT-125's could be worth dropping a pair of K77's back in to see how they sound to you now. The K77 was Mr. PWK's choice and what sounded good to his ears is worthy of consideration or reconsideration. There are a number of folks who auditioned CT-125's that just preferred the sound of the K77. For the AMT option, it's an idea with merit. one could probably pick up some decent speakers with AMT tweeters on Ebay. Might have more pleasing results than modding the Heresy's with AMTs. Quote Link to comment Share on other sites More sharing options...
Guest David H Posted April 18, 2013 Share Posted April 18, 2013 Would ESS Heil AMT tweeters be plausible/possible replacements for my Heresys' horn tweeters? To our aging ears the Heresy tweeters seem to squak more than tweet... The AMT would probably work fine, the spl on the AMT is about right for heresy. My AMT's are 3 ohms, I suspect you could parallel a 1.0 uF cap to the original 2uf cap and give it a shot. These are certainly great sounding tweeters, I was using them on top of a pair of Cornwalls. Dave Quote Link to comment Share on other sites More sharing options...
djk Posted April 19, 2013 Share Posted April 19, 2013 http://www.parts-express.com/pe/showdetl.cfm?partnumber=264-600 The tweeter will work if you tap the mid down to tap #1 (and add a 15Ω resistor) and run the Heil flat out through a 10µF cap. Quote Link to comment Share on other sites More sharing options...
Axz Hout Posted April 19, 2013 Share Posted April 19, 2013 h Quote Link to comment Share on other sites More sharing options...
Deang Posted April 19, 2013 Share Posted April 19, 2013 Max Potter used these tweeters in his Heresys -- which was what he normally listened with. I never thought to ask him what he did with the network because I only had a passing interest in the drivers. What Dennis (DJK) says seems to make the most sense after looking at the cut sheet. Quote Link to comment Share on other sites More sharing options...
Axz Hout Posted April 19, 2013 Share Posted April 19, 2013 r Quote Link to comment Share on other sites More sharing options...
Mike Lindsey Posted April 19, 2013 Share Posted April 19, 2013 The ESS AMT-1B's was my first introduction to Hi-Fi back in '76. I had a friend who was 10 years older than me who had a pretty nice system with those speakers, and I was very impressed. Great highs, very good lows, and a below average mid-range if I recall. When he moved up to the 3-way KEF 105/3's they really blew me away! An outstanding 3-way which he was running with some Carver amps and preamp. I was only 18 at the time, but I knew I was hooked on hi-fidelity from that moment on. It's been a heck of a journey.... Mike Quote Link to comment Share on other sites More sharing options...
Axz Hout Posted April 19, 2013 Share Posted April 19, 2013 y Quote Link to comment Share on other sites More sharing options...
Guest David H Posted April 19, 2013 Share Posted April 19, 2013 For some reason I was thinking these were 99db. I remember these were great sounding tweeters, spl seemed under rated. Dave Quote Link to comment Share on other sites More sharing options...
Quiet_Hollow Posted April 19, 2013 Share Posted April 19, 2013 I'm not convinced that the tweeter is the problem. Quote Link to comment Share on other sites More sharing options...
Johnny's Jill Posted April 20, 2013 Share Posted April 20, 2013 I also used a AMT on a pair of Cornwalls, but I was running them active with Fastrac mid horns. Craig 73 Quote Link to comment Share on other sites More sharing options...
Daddy Dee Posted April 21, 2013 Share Posted April 21, 2013 was browsing Ebay to take a look at what's out there. not in the market, just curious. The AMT's on there right now aren't cheap. it takes a bit of committment to use these in a mod, no? Quote Link to comment Share on other sites More sharing options...
hap Posted April 21, 2013 Author Share Posted April 21, 2013 Too true. So many variables and so little money... 1 Quote Link to comment Share on other sites More sharing options...
pzannucci Posted April 22, 2013 Share Posted April 22, 2013 If you are looking for refinement and will be running the tweeter on top of your cabinet, try http://www.parts-express.com/pe/showdetl.cfm?partnumber=276-410 Careful with the crossover though may actually work well with the stock Klipsch. Also with ribbons and other amt type devices, the listening angle will have a lot to do with the sound but Klipsch crosses very high so the crossover should cause little problem with these as tweeters. Quote Link to comment Share on other sites More sharing options...
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