1950's EV Georgian/Khorns woofer ??

22frank said:
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For anyone who happens to stumbled on this image that keeps popping-up, I would exercise care using that as any sort of "spec" for a replacement woofer. That's my screenie for a '58 driver measured in 2012 after 50 years of suspension stiffening and alnico weakening--and not properly warmed-up (not to mention questionable Sd). In addition, that's one driver--I never measured the other at the time but hadn't found anybody else's data posted. That squiggle on the >10kHz top of the Le rise is also endemic to that vintage of WT1 and has nothing to do with the driver.
 
"For anyone who happens to stumbled on this image that keeps popping-up,"

Sorry about posting your info, I would ask what you would consider to be a modern replacement?

Your picture of the EV 15WK specs is floating around the inter webs as you know, I will no longer be
attaching it to any of my posts.

It has been deleted from post #17 above.
 
@22frank , you said "I have some mid 70' K33s with 2 inch voice coils that would sound much better than your industrial K43s. PM me"

The K43E's were installed because a local shop had them at a good price and the 15's that were in the cabs went bad and weren't original anyway.

Please tell me why your K33's are better.

bc
 
For home use the older K33 had more compliance, the power rating for the woofer was about 40 watts back then.
In the Klipschorn the were happy with 100 watts but not much more.

The old square magnet woofers had a lower Fs perhaps 27Hz.

They did not hold up to loud rock, EL&P the Barbarian took out my first original pair.

After blowing 4 K33s out I replaced the third pair with EV 15L, and EV15B finally using the
EV DL15X. The EV woofers required the 3 inch factory restrictive opening to be 6 inch like the
EV Georgian cabinet and earlier Klipschorns.

I would think older K33 may have a fuller sound on the bottom end. I think Klipsch had the K44 for
an early higher power Klipschorn driver.

P1010319.JPG
 
No apology necessary, rather thank you for even thinking of it. It's my problem for putting it out there w/o the commentary in the first place. It was a good pull on your part and of helpful intent to the thread. I just don't want people to be misled that the one stiff, weaker motored driver is representative. There's no end to the amount of reading/opinions for what woofer is right. I'm no authority--if I had all of them, I'd try all of them and see which one I liked best :)
 
If you like loud rock the EV EVM 15L would be a better choice. I live in New Hampshire, if you live
close and want to take a road trip you could try them out.

The K33 are nominally 4 ohm, DCR 3.3 ohms, the EV 15L are 8 ohm. DCR 5.0ohms.

If you wanted new woofers perhaps the Crites CW1526C would be a good choice. It has the
lower Fs and will take the power. They are 4 ohm nominally.
 
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Not sure if this is helpful all that much but Allied Knight speakers from the mid 60’s, not sure if they went into the 70’s how far they went, used a mix of woofers including EV’s. IF you’re searching for options might want to include them as you search. I have a pair of their 12 inch 3 ways. With new surrounds they handle loud rock, loud movie audio tracks, etc., just fine.
 
In my #24 post above, to show the motor board size difference. The large motor board opening in the Georgian and the smaller in the latter Klipschorn cabinets.

EV Georgian.JPGP1010276.JPG
 
Thanks. If I listen loud it isn't for too long. Am biamped. MC30 running the bass bins. I am in Portland Maine btw. If you'd like to send me a PM with the price on your K33 pair, I'll give it soem thought
 
Pup said:
@22frank , you said "I have some mid 70' K33s with 2 inch voice coils that would sound much better than your industrial K43s. PM me"

The K43E's were installed because a local shop had them at a good price and the 15's that were in the cabs went bad and weren't original anyway.

Please tell me why your K33's are better.

bc
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All depends on the Fc of the georgian bass horn.

K43 will give you more mid bass. Trade off is the bottom end. You will lose more the lower a horn was designed to play. It’ll be more noticeable in a khorn vs a la scala for example. Just how noticeable it is is up to your ears and room
 
Pup said:
I was told the fz is 28Hz for these Georgian cabs, 6" apature
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6” opening you’ll want the square magnet k33 like @22frank said if sticking with klipsch.

Round magnet k33 and k43 klipsch made the opening smaller to account for the higher Fs of those newer eminence woofers

Could try a temp restrictor plate over yours at 3” with the k43 and see if it fills in the bottom end at all
 
22frank said:
"Originals, Series-2, or ProLine?"

The EV 15Ls I have in the closet are the 200 watt Series II

I also have tried the EVM Pro Line 15B but I am using the EV DL15X in my 1975 Klipschorns.

As far as the power rating I use a 120 Watt SS amp and never tried even 1 watt into them as is is loud enough!

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Yeah, the 15B has a different cone and is voiced more for bass guitar . . . the "L" versions would be a better call in critical applications . . .

(I have my EVX150's in TL4025 cabs . . . likely even higher efficiency than the K Horn (107db/1 watt half space) . . . you can pretty much rearrange furniture . . . :-))
 
Revisiting this: @winglet said

"K43 will give you more mid bass. Trade off is the bottom end. You will lose more the lower a horn was designed to play. It’ll be more noticeable in a khorn vs a la scala for example. Just how noticeable it is is up to your ears and room"

decent size room 24'X32X13'

The K43's do have mid bass kick. I don't want to lose that. But lower bass bloom is not there. To me that is the foundation of music, if it's missing it just isn't right. To you guys think @22frank K33 square magnet 15's will do that? Or perhaps the Crites?

Power is 3- McIntosh MC30's. 1 left channel, 1 right channel , 1 bass bins.

Not trying to beat a dead horse, just trying to make an informed decision.

Had a nice chat with Frank yesterday on the phone. Nice guy lots of experience.

bc
 
@tadawson
I have my EVX150's in TL4025 cabs . . . likely even higher efficiency than the K Horn (107db/1 watt half space) . . . you can pretty much rearrange furniture . . . :-))

Do you have horns for 20cps to 40cps that can keep up? :)

Screenshot 2026-02-26 151233.png
 
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Pup said:
Revisiting this: @winglet said

"K43 will give you more mid bass. Trade off is the bottom end. You will lose more the lower a horn was designed to play. It’ll be more noticeable in a khorn vs a la scala for example. Just how noticeable it is is up to your ears and room"

decent size room 24'X32X13'

The K43's do have mid bass kick. I don't want to lose that. But lower bass bloom is not there. To me that is the foundation of music, if it's missing it just isn't right. To you guys think @22frank K33 square magnet 15's will do that? Or perhaps the Crites?

Power is 3- McIntosh MC30's. 1 left channel, 1 right channel , 1 bass bins.

Not trying to beat a dead horse, just trying to make an informed decision.

Had a nice chat with Frank yesterday on the phone. Nice guy lots of experience.

bc
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in stock configuration, you're limited by the LaScala enclosure. It works as a horn to about 112Hz, then is bass reflex to about 55Hz and it will not play lower, no matter the driver because of the limitations of the narrow aperture to the horn's mouth and the length of that horn. The only option for more bass is to do the DJK port mods, which will get your to around 32-35Hz depending on the port length and how much bloom from the underdamped K33* you're willing to handle. *I can't speak to he Delta Pro 15/k43. If you want more bass, the LCL passive radiator mod can get you to 23Hz if you build a new upper cabinet and use a JBL 2226 or 2235 woofer, or will likely get to 32Hz cleanly, with a pair of 10" passives mounted on the rear of the OEM enclosure and stock components
 
@Pup

"My speakers are bi-wired, everything below 200Hz is going thru a lo pass filter and has it's own bass amplifier. I have read that I should be using the 4 ohm taps on the amplifier. Others say use the 16 ohm taps.

What is correct?"

You did not state in your post #1 that your bass bins with the K43 woofers were connected in series to your
MC30 with a 200 cps low pass filter for some sort of mono bass? The 8 ohm tap would seem a safe choice.
 
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