IMF owners thread!

[Andrew Chan]

Hi it is for the first super compacts not the super compact 2s. Will send you a pm thanks

 

[IMF_Pioneer]

Looking forward to your thoughts once you get them up and going correctly.

 

[Andrew Chan]

Big thanks to IMF_Pioneer for sending me a set of the SC crossovers will report back once installed. Cheers

 

[Menno]

Can someone provide me with the schematics of the crossover filter of the ALS40II?
I have bought the replacement Alcaps set, but i think they replaced 2 x 4 mu for 2 x 6 mu. Where should i put them?

 

[dyche01]

Interesting. It seems that IMF made at least two (maybe more) versions of this crossover. Apparently the export version was different from the domestic version. What is the total capacitor count in your original crossovers?

When I recapped mine, I noted that the existing crossovers (counting both speakers) contained the following 12 capacitors:
4x 60µF
2x 12µF
2x 6µF
4x 4µF

When I ordered the ALCAP set from Falcon Acoustics, however, it was missing two of the 4µF capacitors (see below).



I sent them an email about it, and they said that their capacitor list was for the domestic version of the crossover, and that I must have the export version. Nevertheless, they graciously sent me two more 4µF caps for free.

 

[Andrew Chan]

Hi All
Just feeding back from my search for some SC 1 crossovers as i had a set of radford sn8s crossovers that were changed over at some stage of the speakers life from the original.
I had updates the tweeters to audax tw025a0 replaced the foam surrounds on the mids and replacement caps from falcon acoustics.

Thanks the IMF_Pioneer here on the forums in providing a set of the crossovers. They where in a little sad state, one of the boards was split in half and most of the old alcaps missing, tracks missing. IMF_Pioneer did a fantastic job in restoring it.

A little work in replacing some tracks with copper tape and replacing the caps they where back in working order!

The new Caps installed from Falcon Acoustics

Next was replacing the foam surrounds on the mids. The mids that i had required the paper ring removed to allow the old foam to be scraped out. A sharp knife with care did the job.

My first attempt at refoaming surrounds and then replacing the paper ring.
Does anyone know what the black putty like stuff covering the speakers edges touching the baffle is?

This is the completed project. Happy to say there is another IMF out there that is up and running and hopefully last for another 30 years!

I dont have any other IMFs to compare to but these (rather large) bookshelf speakers sound amazing and just a joy to listen to for hours which is what i did! i drove them with a Hafler DH200 (modified) which the speakers handled beautifully. I wonder how they sound with some valve gear?

Cheers

 

[IMF_Pioneer]

Another happy IMF owner courtesy of AK I'd say.

Well done Andrew.

 

[Jarl Wold]

My first posting at Audiokarma. I've been a happy owner of IMF RSPM MkVII since 2002, and before that I had TLS80 II. This is by far, in my opinion, one of the best speakers that are made, even compared to sky high priced speakers made today. They give an insight in music presentation that are realy rare. Best of all, no need for subwoofers I've modified the filters with experimenting with various type of capacitors, and ended up with Mundorf EVO ALU in oil, not the black Supreme types, but the wite EVO series. Changed the 2,2uf in parralell with the100uf in bass section, and the two 1uf in tweeter section, and the 4uf in parralell with the 6uf. The result was much bigger soundstage, faster bass presentation, seems so its going deeper too. Sweeter top too, its much easyer to hear where on the ride cymbal the drummer put the stick. Rimshot at the snare become more fast and explosive/improved dynamics. Voices are standing more free, with more dynamics. I will recomend IMF owners to try this out, and listen what happens. At least, change the 2,2uf in paralell with the 100uf in the bass section, and You will get much faster and dynamic bass respons. The best with this is, it's easy to undo it, if you dont like it. Have a wonderful IMF time.

Best Regards
Jarl Wold

 

[JaapP]

Hi everyone,
I'm currently restoring a pair of IMF TLS80-2. (with the latest improved pcb board)
The previous owner toasted the Celestion HF-1300 Tweeter.
He rewired from the filter so the supertweeter was used as tweeter!
I'm looking to replace/repair the Celestion HF-1300 but i was wondering if it's correct that this is a 4 ohm unit.
There is a red sticker with a 4 on it.
The rest of the units seems to be 8 ohm.....?
(maybe the previous owner changed the units with wrong ones?)




Greetings

Jaap

 

[IMF_Pioneer]

Hi jaap,

It's not really clear to what speakers IMF put different valued drivers into. The RSPM Mk IV had quite a few variations along the life of its production thus there a few different Crossover Boards that were made as well.

Are both your HF1300's 4 Ohm units or is it just one, I'm presuming it's both. If they are both fried then I'd probably say they are originals and as you state that the wiring has been changed to just feed the HF2000 and not spend any cash on doing the right thing and replacing the 1300's. Personally I'd put 8 Ohm units in as replacements thus bringing them all back in line and revert all wiring back to original. They come up regularly on ePrey.

As far as the different values are concerned we've found that the speakers that went overseas were generally a tad different to the ones that stayed in the UK., again that is for certain in the RSPM and maybe also in the TLS-80's I'd say.

 

[Andrew Chan]

My first posting at Audiokarma. I've been a happy owner of IMF RSPM MkVII since 2002, and before that I had TLS80 II. This is by far, in my opinion, one of the best speakers that are made, even compared to sky high priced speakers made today. They give an insight in music presentation that are realy rare. Best of all, no need for subwoofers I've modified the filters with experimenting with various type of capacitors, and ended up with Mundorf EVO ALU in oil, not the black Supreme types, but the wite EVO series. Changed the 2,2uf in parralell with the100uf in bass section, and the two 1uf in tweeter section, and the 4uf in parralell with the 6uf. The result was much bigger soundstage, faster bass presentation, seems so its going deeper too. Sweeter top too, its much easyer to hear where on the ride cymbal the drummer put the stick. Rimshot at the snare become more fast and explosive/improved dynamics. Voices are standing more free, with more dynamics. I will recomend IMF owners to try this out, and listen what happens. At least, change the 2,2uf in paralell with the 100uf in the bass section, and You will get much faster and dynamic bass respons. The best with this is, it's easy to undo it, if you dont like it. Have a wonderful IMF time.

Best Regards
Jarl Wold

Hi Jarl Wold. Those oils caps are pretty big from memory, wide and fat? How did you fit them onto the crossover boards? Do you have pics by any chance before you put them back into the cabinets?

Cheers Andrew

 

[Jarl Wold]

They fit exactly in, it's some time ago now. I put one or two capacitors on the backside too, and the filters fitted just inside the speakers

 

[Andrew Chan]

That makes sense about using some real-estate on the back of the crossovers too. Thanks for posting the results of your experimentation!

 

[Menno]

Hi,
i want to change the Ferrofluid of the Super tweeter of my TLS50s but am not sure how i can get inside (ColeTweeter1.jpeg). There are no screws as seen on an image from this tweeter on the website of Cole (4001-1.JPG).
Can i open this tweeter or is it better to leave it alone?

 

[Menno]

too answer myself concerning the Cole Super Tweeter of my TLS50IIs, in the meantime i got news that the 4001G does not contain ferrofluid. And possibly later versions of this tweeter (4001K) do - hence the screws??.

I have a good mic and am thinking about doing some measurements of this tweeter. Like creating some frequencies >15 kHz and recording the result, checking it with Audacity. It's hard to directly hear if these super tweeter actually work OK, as i have become a person of a certain age...

 

[IMF_Pioneer]

Hi Menno,

I guess you've answered your own question regarding the Fluid replacement.

As far as checking to see if they work, this is always a problem as we get older as our hearing rolls off due to our past lives and what we've been subjected to over the years. Many of us suffer from industrial deafness as we get older and that affects us around the 4000Hz area and also many of us have our hearing roll off around 10,000Hz as we get older. I've always said that I would part with all my gear if my hearing goes to the point where this good equipment is no longer viable to me and as I approach my 60+ year age bracket I can feel its getting closer to that point.

 

[Yvan_donald]

Hi, yes no ferrofluid,myself will be 62 in november.Work as cabinet maker and in construction field mostly finition interior (noisy). I can easily distinct all the sound coming from all units.Maybe I'M a Lucky one, because I dont see the time I will not enjoy listening my music.

 

[3kes]

First post on Audiokarma! I own a set of IMF Super Compact 2 that I rebuild recently. Placed new tweeters, caps (from Falcon acoustics) and replaces the mids for the Monacor MSH-115. I bought the SC2 with Monacor SP60-8 mids. Well, they sound great again.

Since I am an IMF enthousiast I also recently bought a set of TLS50 MK2. Also had a lot of work on them. Mids not original and one woofer is out of centre (and is going to be re-centred)

The question I have is this: One of the woofers is the B200 SP1014, that has to be the SP1039. I'm in search for this unit. Is there a replacement available? Originals seems to be rare.

 

[Yvan_donald]

Hi, welcome ,be patient for the woofer it come for sale on e bay,the mids too come for sale,or change it to Monacor.

 

[IMF_Pioneer]

The SP1014 was used in the first Super Compact, so at least you have a saleable item to put the proceeds towards the required SP1039

BTW a warm welcome to the IMF thread 3kes.