Need Help Identifying Strange Vintage Speakers...

Connor G

Ear conditioned
Subscriber
Hey guys!

I’m trying to help out a good friend of mine who just picked up some very cool looking speakers. 2 way, oval mid-bass driver, side ported (Maybe transmission line?)

Here are some photos:
F4C3AB35-73F9-4608-B71A-ED9CB9A6C13A.jpeg 4A5246B5-8112-4B90-ABA1-D633A83199AE.jpeg

I’m thinking they could be Either IMF or EMI... Any thoughts?
 
Here are a couple more photos.

One of the tweeter:
2DC071A6-6917-439B-B031-B8C28D3ADF00.jpeg

And one of the woofer/dustcap... looks to be a coaxial. Or just a vented dust cap.
61CE8EBC-128E-44C3-83E1-9D89C707C11B.jpeg
 
Here are some more photos!
This is getting very interesting... I personally don’t think they are home made but who knows...
52E1D1D9-1828-4319-9B07-B2AE74ABC8CB.jpeg F6703E47-EF02-4310-A882-5C0BA1513360.jpeg 2BCC9097-8D92-4EB9-A6CC-36ECB57AA4A8.jpeg C7E6427C-A83A-4F2E-AB60-C474DA3AFB82.jpeg 059E7783-9921-4F39-9485-29F7A1B8C2F6.jpeg F4E2A226-B25E-44F7-B1BE-42F34F660C34.jpeg
 
Tweeter is a KEF T52A
Woofer is an EMI 14A/770NX, which is what was used and modified in the B&W DM3.
The cabinet is a sort of strange transmission line style, dampened with what seems to be either whool or cotton. Not fiberglass.
 
Part number on the crossover reads “ADF3000/8”
The only cross reference I can find is an ad off of google of a Philips branded crossover, model number “ADF3000/8.8”
27EF061D-32FD-4548-93BD-0D05E0AFC4E7.png
 
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I wonder if that crossover is from an ADS speaker. Or the speakers are ADS. But I don't find anything on the web either for that number, or anything ADS that looks like it.

Can't be super old, the caps look fairly modern.

The KEF inspection tag though...where did you find that?
 
I'm also voting home made. KEF tweeter and EMI woofer. Crossover is ... wherever. Or - long shot - part of a kit?
 
The multiple lines drawn on that baffle or port looks like a couple attempts to line the holes up have that home brew look. Also the large finishing nails sticking out, I'm guessing to hold the stuffing in place?, also looks home made. Nice job though. Someone deffently knew their way around wood working tools. With that much time and effort spent on those cabinets the builder had a specific idea of what he was going for here.
 
I wonder if that crossover is from an ADS speaker. Or the speakers are ADS. But I don't find anything on the web either for that number, or anything ADS that looks like it.

Can't be super old, the caps look fairly modern.

The KEF inspection tag though...where did you find that?
whoops. Didn’t realize I typed “ADS”... I meant “ADF”. Fixed it. And I’m not sure where he found it. I think it might have fallen off of the KEF tweeter.
 
Hi everyone,

I attached an interesting excerpt I found regarding the EMI woofer. The one used in this design appears to be the earlier quality revision.

I couldn’t get too much of a back story as I bought them off the son and they belonged to the father- but his understanding was it was a kit speaker that he had someone professionally fab’ up for him.

I can’t find any record of the T52A and the EMI 14a/770 being sold as a kit though.

Great sounding speaker none the less. The kit days were interesting to hear about and it’s great to still come across them.

I’d like hear more about what the internal design is doing if anyone knows?

Cheers
Seb
 

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Thanks how do you know if it's chrysotile?
See if it will burn or melt under high heat. If it burns, cotton or wool. If it melts with a blow torch, fiberglass. If it sits there and laughs at whatever heat you throw at it, could be Chrysotile. If you want to know for sure without trying to melt it, send it to an accredited lab which can identify asbestos.
 
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