cpt_paranoia
Addicted Member
Spotify is a relatively low quality, lossy stream. A lossless source might bring you closer to bliss?
IMF owners thread!
- Thread starter canuckaudiog
- Start date
I was bored today....lol! I am building a new audio rack, and I had some left over walnut. I measured my RSPM stands, and decided to quickly whip up some stands for my 80's. These took me about 4 hours from scratch. I spent some time adding and removing stiffeners, or battens where I thought it may help as these are from wood and not steel. I roughly threw them together and I am spending some time listening to them now. So far the bass is much tighter and more focused, and the stage is much bigger. If I like these I may spend some time making templates so I can cut things with the router to replicate, and then decide on how to do joinery so there are no screws but still solid. ove 
Those look terrific!
I’ve been pondering making some for my 50’s but was thinking really simple, either just boards with feet or a variant on the JBL stands…
BUT I have leftover wood from a speaker project I’m in the middle of, and now I know what to do with it!
I’ve been pondering making some for my 50’s but was thinking really simple, either just boards with feet or a variant on the JBL stands…
BUT I have leftover wood from a speaker project I’m in the middle of, and now I know what to do with it!
I thought simple as well, my wife says I can never do simple!!!
I will do something up but for my 80's it was basically 14 3/8" front to back and 17" inside side to side, you could make that a little narrower if you like. They measure 6" tall at front and 5.5" tall at the back. I cut a taper on the top side with a taper jig set to 2.5 degrees on the table saw.
Yvan_donald
Well-Known Member
Hi and welcome to Audiokarma, this is probably Prof. MK III improved because the crossover is the same as mine. Normally the back is laminate black, maybe it was a special order to get the back made of the same finish? Or ex owner install the speaker in a big room showing the back of speaker and decide to made in the same finish? The outlet at the bottom suppose to have green screen with waves fiberglass and not the long fiber like your's. Did someone think the fiberglass was dangerous to breath and take out bit of it and put the long fiber and remove the screen? Lots of questions I'm asking myself about your's IMF. I have two pairs and my first pair have serial number near crossover #1008 writen on the wood, other one nothing. Yvan.
Yvan_donald
Well-Known Member
Hi, did the connections on the back are on the same side or one on right side the other left. Because my first pair are both on right side. The second don't, Yvan.
Yvan, thank you for the response and the information. I don't have any history on them, the son of the previous owner was selling them and he didn't know much about them. I am confused by the fibers in the outlets as well as I've never seen a photo of an IMF with them. The green plastic screen is still present and doesn't look like its every been removed/replaced. When I removed the mid woofers they each had a small wad of the same fibers directly behind the drivers with the rest of the tube filled with pink fiberglass. The binding posts on the back are mirrored with one on the right and the other on the left, behind the tweeters on each. The tubes behind the mid woofer were different in each speaker as well. One was a gray and the other was white. It looks like a couple of drivers may have been replaced/repaired at some point as well. I couldn't find any serial number near the crossovers.
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Yvan_donald
Well-Known Member
Hi, the woofer with no hole in the center is an old model B-139 SP6171, look inside where the back styfoam cone if it is white paper tube or bextrene clear tube where is the suspension (spider). This one is probably not original. This old model with bextrene colapse at loud passage if you drive them hard compare to the paper kEF has improve the coil structure. So if these speaker came with long fiber it mean it's the MkII you have. The crossover have been upgrade compare to the original of your's when they were new. It's the first time I see pictures of MKII, usually the MKIII is more common. If both woofers are in good shape, for now it's okey but think about buying another woofer with the hole in the back B139 SP6171.you can find one used. Yvan.
Yvan_donald
Well-Known Member
Hi, if you go to website IMF electronics and look for the professional monitor MK III. They explains how the Prof.monitor have fourth generations and the last one, MK III the hand wooven honeycomb mesh damping in the T-line.the front baffle of any IMF models are glue and with wood screws and impossible to open it without destroying the stucture of the cabinet.
Yvan_donald
Well-Known Member
Hi, it's seems you have to write: IMF prof. MK III to have access to IMFelectronics for the document. That's the way I have access to it.
Yvan, thank you so much for the information. I have spent the last few days reading through this thread and appreciate you sharing your knowledge over the years.
I looked over the speakers again and am trying to figure out how to revitalize them.
From what you've told me about the baffle they seem to be Professional Monitor Mk II cabinets, with Prof. Monitor Mk III Ver 2 (improved) crossover, and each cabinet has different drivers.
In one cabinet there is a B110 6362 paired with a maybe? B139 SP1044.
In the other cabinet there is a B110 SP1003 paired with a B139 6171.
Hopefully that is all the sorting out I need to do. I don't mind too much as I got these for free from someone who was using them as a rear channel with a pair of Polk SDA SRS as the main channel.
My ears must be pretty unrefined because even with this arrangement I am enjoying them, though I'm sure there is room for improvement. Do you or anyone else on here have any recommendations on how to restore these?
I looked over the speakers again and am trying to figure out how to revitalize them.
From what you've told me about the baffle they seem to be Professional Monitor Mk II cabinets, with Prof. Monitor Mk III Ver 2 (improved) crossover, and each cabinet has different drivers.
In one cabinet there is a B110 6362 paired with a maybe? B139 SP1044.
In the other cabinet there is a B110 SP1003 paired with a B139 6171.
Hopefully that is all the sorting out I need to do. I don't mind too much as I got these for free from someone who was using them as a rear channel with a pair of Polk SDA SRS as the main channel.
My ears must be pretty unrefined because even with this arrangement I am enjoying them, though I'm sure there is room for improvement. Do you or anyone else on here have any recommendations on how to restore these?
Yvan_donald
Well-Known Member
Hi, your's midranges seems to be both SP 1003 just different batch, both woofer are SP6171 except one is an old generation, if you need one woofer with the center hole I have one for you at good price. The tweeter HF 1300 celestion with black plastic is the same as mine. If you need one I have one for you at a good price. But you don't have to rush for it now. You will have to change some capacitors in the x-over, you can get the capacitors kit from "Falcon acoustics UK" for the Mk 3 improved. Yvan.
Yvan, thank you again. Yes, I think changing the capacitors will be one of the first things to do and if I need some original replacement drivers I will keep you in mind. What are your thoughts on using new drivers (Falcon B139, Falcon B110, Coles CE 3000, and Coles 4001)? Replacing internal wiring, cleaning/replacing resistors on perspective controls, adding baffling anywhere? I may paint or veneer the front if I can't clean off the mold stains.
There was a 6362 sticker on the midrange with the unpainted basket, sorry I didn't include that.
There was a 6362 sticker on the midrange with the unpainted basket, sorry I didn't include that.
Yvan_donald
Well-Known Member
Hi, I know the midranges from Falcon it's a good move but it is bit expensive, the B139 of Falcon have different shape SP1044 and the template to fit in our opening is not the same and for both tweeter's I much prefer the original Celestion HF1300,HF2000 combo. Plus look like the coles 4001 have a smaller coil, smaller dome? Falcon sell some protector screen for the Kef tweeter and similar for use with the HF2000, the original protector is hard to find on used market, you almost have to buy to complete HF2000 with protector to get original. Front baffle, just à small sanding and a nice spray coat of flat black made a big difference, that's what I did on mine. Masking tape and cover the holes.
zibi079
New Member
https://www.marktplaats.nl/v/audio-...m2085141710-2-x-audax-hd-12-x-8-d-25-tweeters
If someone is looking for one, it's a good option for 50 euros per pair
I hope it doesn't violate forum rules. This is not my ad
If someone is looking for one, it's a good option for 50 euros per pair
I hope it doesn't violate forum rules. This is not my ad