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Old 29th January 2008, 08:21 PM   #1
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Default Isophon KK8, KEF T27

Anyone know where I can find FR and impedance graphs for these vintage tweeters?
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Old 29th January 2008, 08:38 PM   #2
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Click the image to open in full size.

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Old 29th January 2008, 10:11 PM   #3
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Thanks for the quick response Dave!
Sure wish I could find some graphs that I could SPL Trace.

P.S. Don't know if you remember me. I bought some PA gear from you in the early 80's. Glad to see you're still into audio. Gonna have to check out your speaker designs.
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Old 29th January 2008, 10:34 PM   #4
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Quote:
Originally posted by guitarded
P.S. Don't know if you remember me. I bought some PA gear from you in the early 80's. Glad to see you're still into audio. Gonna have to check out your speaker designs.
Wow -- a blast from the past. You'll have to remind me of the details

Shortly after the pro buisness (which was a financial bust), i went into computers and was just a passive audio guy for about 15 years, but that wasn't a satisfactory state of affairs and i have come back with a vengence. I'm just about to start putting my toes back into the pro stuff with Maria.

I have some T27 FR, but they are with the XO in line (part of a paper on the XO in teh 104aB) -- i can dig that out if you think it useful. Attached is an impedance curve from a set i sold on eBay.

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Old 29th January 2008, 10:40 PM   #5
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I don't know where this one came from, or the conditions of measurement, but it is a T27 FR plot.

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File Type: gif b139_t27.gif (18.8 KB, 370 views)
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Old 30th January 2008, 12:51 AM   #6
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Dave, Details: 3 Bryston amps, Biamp board, Shure 57 mic's + stands. remember?
Even farther "blast from the past", I built some b139 transmission lines from your plan back in 1977. I still have them!
Anyway, Thanks for the graphs. I'm sure they will be helpfull.
I'm trying to design some HT speakers and was hoping to utilize some of the vintage drivers I have hibernating in my closet.
I haven't messed with audio in the last 25 years. Hopefully this project will rekindle some passion.
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Old 30th January 2008, 07:31 AM   #7
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Quote:
Originally posted by guitarded
Details: 3 Bryston amps, Biamp board, Shure 57 mic's + stands. remember?
The heart of the PA/// 2 4Bs a 3B and a biamp XO?

Quote:
Even farther "blast from the past", I built some b139 transmission lines from your plan back in 1977. I still have them!
I sold a zillion KEF drivers back in the late 70s, and have seen almost none of them, so everyone must be keeping them. Still using the woofer?

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Old 30th January 2008, 09:20 AM   #8
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Isophon has a huge archive on older drivers.Maybe you'll find it there:
http://www.lup-berlin.de/archiv/Katalog/index.html
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Old 30th January 2008, 10:04 AM   #9
Geoff is offline Geoff  United Kingdom
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T27A datasheet with response graph etc.
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Old 30th January 2008, 10:57 PM   #10
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Dave, Biamp (brand name) was a 16 channel mixer.
I still have the B139's loaded in the TL's. My current speakers are Quad ESL's and the B139's are a little too sluggish to mate with them. If I remember correctly, I couldn't get a smooth transition to the fast ESL's.
Thanks Rolf and Geoff !!! I might have enough now to create .frd and .zma files.
Thanks again for your help! Muchly appreciated! You guys are awsome!
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