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IMF owners thread!

ok, there's a similar discussion earlier in this thread, not sure exactly what the conclusion was
https://audiokarma.org/forums/index.php?threads/imf-owners-thread.509555/page-102#post-14473179

and I believe this would just be for the primary crossover circuit.
I might be wrong, but I believe this model has the same/similar adjustment circuit as my TLS 50's on the back of the terminal cup to adjust tweeter levels -- this could easily be considered "optional" if your speakers are missing this board as well.
 
Hi guys. Please someone tell me what is this. Kef concerto speakers and crossover in imf cabinet. This is a diy project? Thank you!
 

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beekeo said:
do you have a larger/higher resolution photo? a little hard to see what's going on here.
Click to expand...
yes of course. After a deep shearching on the internet, i found this model is Kef Bailey
 

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Hi, I have the first version of the IMF TLS 50.
The tweeters are:
left IMF TW1500 F 8 ohms from July 1983
right HD12 x 8 D 25

Right tweeter does not work :(

What to do?
1. repair HD12 x 8 D 25
2. try to find 2x audax TW025a0
3. I can buy 2x audax TW025a1 - good price 50 euro with shipping
4.buy old super contact imf as tweeter donor 115 euro with shipping

audax TW025a1 will be an equally good replacement as TW025a0?
 

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Hi Zibi, welcome!

first, do you know how the HD12x8 tweeter failed? I assume this was a replacement for the original TW1500... Did the HD tweeter work at one point?
Before buying a replacement I would verify that the driver is damaged by testing it with a multimeter and also rule out a fault in the wiring or crossover components (including corrosion in the tone switch and components in the circuit on the back of the cabinet)

but those prices for replacements look good, £49.50 is Falcon's price for one.
 
Hello thanks for fast answer. I send You priv. mesage.
HD12x8 - it worked, but it sounded quieter and that was probably the original (probably repaired one day). Now it has stopped working :(
The TW 1500 is from the 83rd year, so it probably replaced the original HD 12x8. The first version of tls 50 is probably older than 83?

Is the new audax tw025a0 better than the original old hd12x8 / tw1500?

The most important question tw025a0 can be changed to tw025a1?
 
I might be wrong, but I was under the impression that the AUDAX TW025A0 was the newer device?
quieter but still working kind of makes me suspect that the capacitors could be the culprit
 
yep, I would assume the old Audax plate will swap over to the hold the new Audax plate
BUT the IMF TW1500 in the left speaker.... visually it looks the same, but I would pull both of them and compare the plates to make sure

also might be worth swapping the tweeters from left to right cabinets to verify the tweeter is at fault
 
now i see that tw 1500F can replace PEERLESS DT10 HFC, PEERLESS KO10 DT?
"This direct replacement combines the high-quality 2015 manufactured 8 ohm 25 mm voice coil TW025A0 tweeter with a precision Falcon Acoustics matching rectangular faceplate. It is a direct replacement for the classic Audax 12 x 8 faceplate version of the HD12 x9D25 directly made by Audax for numerous OEM manufacturers such as IMF TW1500F but with improved performance.

Will also directly replace most OEM, PEERLESS DT10 HFC, PEERLESS KO10 DT rectangular faceplate tweeters with 12x8 face plates used by CELEF, Radford, Monitor Audio, Mordaunt Short, Bowers & Wilkins, Dalesford etc."
 
Hi, the IMF tw1500f is ferrofluid, on all Mk I the Peerless was used, the used 3 models, the one with the positive and negative wire on top of the plate straight line, the one with clean plate no wire on top and the one with the positive and negative recess in the plate angle line, Audax came much later on Mk II, the square foam too.Yvan.
 
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