JDJohnson Posted April 26, 2021 Share Posted April 26, 2021 Did Klipsch and if so why and when did they change Klipschorns high crossover point from 6,000 to 4,500 Hz? Quote Link to comment Share on other sites More sharing options...
boom3 Posted April 26, 2021 Share Posted April 26, 2021 As the can of worms opens ...the K401/K 55 (whatever) combo begins to have issues at the outer edge of the top range, and the reduced crossover fixes that to an extent. Also, IIRC, the K-77 as last updated (the Philippine version?) was more robust mechanically that the original ElectroVoice T-35/K-77s. The Khorn midrange transition has been discussed many times here and no doubt our pals will chime in shortly. 1 Quote Link to comment Share on other sites More sharing options...
garyrc Posted April 26, 2021 Share Posted April 26, 2021 IIRC --- and this is memory retrieval from some 35 years ago, so may not be accurate --- there was a dip at the top of the K55/K400 range. About 1980/1982 that was temporarily fixed by altering the phase plug in the K55. That alteration was short lived. Lowering the range of the K77 down to 4,500Hz took the K55 dip out of the picture. EV had originally designed the T35 (K77s were selected, tested versions of the T35) to function down to 3,500Hz in their own speaker systems, with no problem. PWK originally used a 6 dB/ octave slope in the balancing network, and EV used a 12 dB/octave slope. In the 4,500 Hz version, Klipsch used a 36 dB/octave slope (!) to protect the tweeter. I think this started with the AK4 network. It sounds great. I hope I remembered all of this correctly! Others please chime in! 1 Quote Link to comment Share on other sites More sharing options...
KT88 Posted April 26, 2021 Share Posted April 26, 2021 garyrc, That sounds very reasonable to me and it goes along the lines of my guess in my thread about the timeline of the K55V versions...until the end of the AA crossover when the K55V was discontinued. 2 Quote Link to comment Share on other sites More sharing options...
OO1 Posted April 26, 2021 Share Posted April 26, 2021 1 hour ago, garyrc said: I think this started with the AK4 network. It sounds great. Gary ---this is correct the AK4 -AL4 xovers have the 4500hz crossover point , and a steeper slope than prior models- 1 Quote Link to comment Share on other sites More sharing options...
OO1 Posted April 26, 2021 Share Posted April 26, 2021 16 hours ago, KT88 said: garyrc, That sounds very reasonable to me and it goes along the lines of my guess in my thread about the timeline of the K55V versions...until the end of the AA crossover when the K55V was discontinued. nope the replacement of the AA was the AK and the crossover point was 6000Hz - -The k55V--ATLAS driver was never discontinued by ATLAS although klipsch ceased to use it from 83 to 2001-----and from 2001 to this day , klipsch uses the K55V with a designation k55X, 2 Quote Link to comment Share on other sites More sharing options...
Panelhead Posted April 27, 2021 Share Posted April 27, 2021 I think Roy could add that it sounds better. If you have the tweeter for the change. 1 Quote Link to comment Share on other sites More sharing options...
JDJohnson Posted April 27, 2021 Author Share Posted April 27, 2021 Thank you all for your replies. I remember reading here there was a problem with the K55V/K400 going up to 6,000 Hz and I thought the K77 also had some problems going down to 6,000 Hz with how the crossovers were designed, so I wasn’t sure if Klipsch changed the crossovers and the K77 to solve the problem of only the K55V/K400 by crossing it at 4,500 Hz, or maybe the problem with the K77 too by replacing it with another that can go down to 4,500 Hz. Quote Link to comment Share on other sites More sharing options...
JDJohnson Posted April 29, 2021 Author Share Posted April 29, 2021 I think I got it partly from here, https://critesspeakers.com/bk-sound-type-a4500-crossov.html I’ve read some here about it too, but can’t find it again using the search function here. I’m guessing Klipsch did it because of these issues too? Quote Link to comment Share on other sites More sharing options...
garyrc Posted April 29, 2021 Share Posted April 29, 2021 I believe that Factory Khorns (AK4 and AK5) that use the K77 and cross it over at 4,500 Hz, use a 36 dB/octave roll off in the balancing network to protect the K77. 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.