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IMF owners thread!

I fully understand the point you are making - and after decades of playing around with hifi I appreciate that there are so many factors that might influence sound as received, and sound as perceived, that no one on this thread can provide the silver bullet for anyone else in terms of prescribing a "perfect "system. Add to that are the vagaries of vintage kit which, no matter how well it is maintained, develops individual traits over the years (all part of the joy if owning older hifi of course).

That said, the technical matching of components is something that one has to bear in mind, and often one reads about people's experiences when trying different combinations of kit, some of which seem to be inherently better than others.

So I suppose that what I was after was anyone's views about whether the Trio blocks are suited to IMF TLS 80s, or perhaps there is another iteration of IMF that seems to do better. For example, the Trios are rated at 150watts and the 80s are, as far as I am aware, set up for inputs between 40 and 80 watts. So, while one can of course control the output volume, it might be that the Trio's sweet spot is pushing the 80s a bit too hard. It's that sort of assessment that someone might be able to comment upon.

(It is, of course, quite possible that the Trios are well suited to the 80s. After all, the Luxman M-4000 power amp was (according to a number of contemporary reports) designed with the IMF TLS 80s in mind, and it chucks out 180 watts per channel.)

Anyway - would still be interested in other IMF enthusiast's views as I am in the fortunate position of having both Trios and Luxmans on hand. Perhaps I am also looking for a way to justify the expense of having the Luxman M-4000 completely recapped and serviced as one of the channels is out! Might have to be a Christmas present to myself....................
 
Hi, It is better to have a lot of power with a good damping factor to get the maximum of your IMF, wattage is not a problem and you have to know the limit of your IMF. All IMF have their limit and they are made for normal listening never push them to hard , specially the tweeters ,not good If they sound hard at higher frequency or to much punch at lower frequency passage.I drive my prof. Mk 3 with bryston 150 watts /ch. With good result and I know their limitation depending of style of music I'm listening.best regards,Yvan.
 
Wow those are the widest pair of Mk IV's and VII's I've ever seen ! who needs a pair of each when one of each will take up all that floor space ?

The wonders of Photoshop eh ?
 
Hi, please tell me did you recap any of these IMF's.Do you listen these in random or you have a prefer one and only listen alway's the same one (Tor-S)? Do you listen classical music mostly or no particular type of music.
 
Yvan_donald

All the pairs got new type AlCaps, but the RSPM MK7 i have put some mundorf supreme alu in oil. Im not finished with the crossover work on the MK7, will continue to put mundorfs into them until there no more space. They sound amazing.

On the mk4 you can hear tweeters playing "separatly" from the mid. Mk4 sound more dark, but there is some magical about the B110 i like it.

Mk7 is amazingly well balanced with the mid and tweeter thing, they just play togeter and i think thats why piano, guitar strings and orchestral music sound so real. I like the mk7 best, because of the natrural tone, but the mk4 is really fun to listen to aswell.

The CM2 i find to bright, and the vocal, drums sound too weak.

The MCR2A play way better than CM2. They sound really good compared to its size.

I lile to listen to rock, pop, blues and classical.
Hans Zimmer and Pink Floyd is one of my favourites.
 
Hi,on your mk4, you have the combo celestion hf1300, hf2000, most IMF owner's tell the sound of this combo sound better but you on the contrary tell us tthe new version sound better.The mk7 have the mid more insulate, so less interaction with the woofer. Compare to Tls 80 and mk4, the 6" cardboard tube who is more incline to get the frequency of the bass mix with the mids when listening at higher volume.Myself I have insulate of my prof.with 1/2 " thick sheet of active carbon used for filter in aquarium,it at give me excellent result to isolate both frequency's from each other (mid and bass), much cleaner sound.I put some pictures in IMF thread,don't remember the page but I will look to find it, plus myself in my hf1300 found some bad frequency,it was in certain passage, I remove the back plastic cap,take out the foam and replace with a piece of active carbon size of the foam, now the bad frequency is gone at any level.
 
I have an ongoing headace here :)

I dont know what should be the exact values in my crossover.
My firends RSPM mk7 is not exactly the same as mine, some different values here and there.

I am not able to find a crossover schematics for the IMF RSPM MK7 :-(
Does someone have a RSPM MK7 that can open and take some pictures? :-)

The SACM mk2 crossover is very similar, but it's not completly exact.....
SACMXover82.jpg

Here is a old pic of the crossovers before recap, so this should be the original values:

tegning.jpg
 
Hi Tot-S, I think every IMF of same model can have different value probably because of the difference of composants, same woofer but maybe not exact value on the meter, same for mids and tweeter,supertweeter. So every pair IMF have is own X-over adjusted or match ,specially on Ref Standard model or SACM. The back of your X-over it is similar to the pictures I have put in page 32 (mk 4 x-over)
 
Yvan_donald said:
Hi Tot-S, I think every IMF of same model can have different value probably because of the difference of composants, same woofer but maybe not exact value on the meter, same for mids and tweeter,supertweeter. So every pair IMF have is own X-over adjusted or match ,specially on Ref Standard model or SACM. The back of your X-over it is similar to the pictures I have put in page 32 (mk 4 x-over)
Click to expand...

Hi.
Same colour but different circut.
Yeah. I can see that on the MK7 compared to SACM mk2 they removed R5, R6 and R7 @ MK7 and they changed C5 to ( 6uf + 4uf )
But i still cant understand the blue 6.8uF that was there.
 
Hi,like in my Mk 3 not improved it was a 6.8 uf + 2x 1uf but on the improved x-over replace by 4 X2.2 uf, maybe your x-over have no space to install 3 or 4 x 2.2 uf ? Who knows did you contact Falcon acoustics (jerry) , for giving you maybe pictures or the exact value of the lastest model.Best regards,Yvan
 
Yvan_donald said:
Hi,like in my Mk 3 not improved it was a 6.8 uf + 2x 1uf but on the improved x-over replace by 4 X2.2 uf, maybe your x-over have no space to install 3 or 4 x 2.2 uf ? Who knows did you contact Falcon acoustics (jerry) , for giving you maybe pictures or the exact value of the lastest model.Best regards,Yvan
Click to expand...

Hi.
Yeah, i think i also had 6.8 + 2x1uf, yes theres a lot of holes to put the capacitors in the tweeter section.
Have tried to contact Jerry but no answers. Did try two times.
Will try again :)
 
Jerry is currently on Holidays thus why you can't raise him.

As far as different values is concerned I think you'll find that IMF made speakers for many different markets where listening choices are somewhat different.

The European settings would be totally different to the USA settings as Americans always preferred a bit of a harsher sound while Europeans preferred a smoother sound, thus the different values in the crossovers.

One thing I will say about the Mk VII crossover compared to the Mk IV units and that is they really looked far more amateurish in their appearance compared to the Mk IV which looked far more precise and scientific in comparison.
 
Hi, Are you sure? Sound for European market? I didn't know classical music sound different in the USA or Canada.I know Tls 80 serie was made with more output in the bass frequency than the professionnal serie because of smaller TL. For me different value component X-over adjust for each pair that's more like it. But you allowed to think differently, I'd like to know what Jerry will say about that or any makers of speakers.Best regards,Yvan.
 
I dont think they voiced the speakers for different markets, but maybe more the matching of the drivers to the crossover. But anyway it wil just be guessing.

We have to indentically speakers in my town with different crossovers, what is correct?
And both differs from SACM mk2 schematics as well.
 
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