Isophon KK8, KEF T27

guitarded · 29th January 2008, 08:21 PM

Anyone know where I can find FR and impedance graphs for these vintage tweeters?

planet10 · 29th January 2008, 08:38 PM

dave

guitarded · 29th January 2008, 10:11 PM

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.

planet10 · 29th January 2008, 10:34 PM

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.

dave

planet10 · 29th January 2008, 10:40 PM

I don't know where this one came from, or the conditions of measurement, but it is a T27 FR plot.

dave

guitarded · 30th January 2008, 12:51 AM

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.

planet10 · 30th January 2008, 07:31 AM

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?

dave

Rolf Zetterberg · 30th January 2008, 09:20 AM

Isophon has a huge archive on older drivers.Maybe you'll find it there:
http://www.lup-berlin.de/archiv/Katalog/index.html

Geoff · 30th January 2008, 10:04 AM

T27A datasheet with response graph etc.

guitarded · 30th January 2008, 10:57 PM

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!

29th January 2008, 08:21 PM	#1
guitarded diyAudio Member Join Date: Jan 2008	Isophon KK8, KEF T27 Anyone know where I can find FR and impedance graphs for these vintage tweeters?

29th January 2008, 08:38 PM	#2
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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29th January 2008, 10:11 PM	#3
guitarded diyAudio Member Join Date: Jan 2008	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.

30th January 2008, 12:51 AM	#6
guitarded diyAudio Member Join Date: Jan 2008	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.

30th January 2008, 09:20 AM	#8
Rolf Zetterberg diyAudio Member Join Date: Aug 2005	Isophon has a huge archive on older drivers.Maybe you'll find it there: http://www.lup-berlin.de/archiv/Katalog/index.html

30th January 2008, 10:57 PM	#10
guitarded diyAudio Member Join Date: Jan 2008	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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