IMF owners thread!
- Thread starter canuckaudiog
- Start date
Yvan_donald
Well-Known Member
Hi, congratulation! great speaker's, like Nashou said, first listen them. The difference is the use of different inside foam, the crossover MK I cut at 375hz compare to the MK II cut at 350hz. Sound of woofer more present, but still very natural. On you're photo of capacitors we can not see all the values, but it is probably 60 uf and 100 uf with rhe 6 uf show in you're photo, hard to say. The Mk II improved have the Elac units, but the celestion and kef units of your's is consider by some peoples to have better sound and much easer to fix or find and specially now with the new units of Falcon accoustics for new midranges and new woofer's (take more power). Best regards, yvan.
Looks like only 6 capsbtotal have been replaced
2 x 60 mfd 50v
2x 100 mfd 50 v
2x 6mfd 50 v
Have been replaced. Looks like he only changed caps on one crossover?
Should i just get a complete kit from falcon and replace all the caps on both crossovers .
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Yvan_donald
Well-Known Member
Hi, no you have only 1 X 100uf, 1X 60uf, 1X 6uf in each speaker's,so these capacitors comme from both side. Nashou have the same speaker he should be able to tell us what is the value of the other's cap in your crossover.I own professional MKIII Improved and because of almost the same celestion STW and TW, same Kef SP1003 mid's, but old SP6171 - B139 , you're SP1044- B139, my crossover have 100uf, 60uf, 12uf, 6uf, 5X 2.2uf, 0.47uf.unscrew the woofer, so you will have access to the crossover. Take some photos to see the news capacitors he used to replace these 3 values in your crossover, Yvan.
Yvan_donald
Well-Known Member
Hi, I just saw the picture of the invoice, so he replace with Dayton audio 240V., good choice, they are film capacitors and not electrolytics like the old one, will last forever these 3 values if you don't overpower you're speaker's. Some IMF aker's prefer to put same type of capacitor's like falcon acoustics kit (electrolytic). But listen them, and if you like the overall sound, tight bass and natural mid's, nice high frequency. Myself I have change all for film capacitors and I'm very happy with the overall sound.I don't think I have change the original voicing of my speaker's but I have spend time and money to improved them with good quality parts, Yvan.
Thanks for your reply Yvan! Yeah ill just leave the film caps for now. Do i need to change any other caps or is that all of them ?( via the invoice) what other upgrades have you done on yours? i am very happy with the sound and cant wait to hear them with a nice tube preamp when i find one i like. . i love my super compacts just as much but the tls obviously fill the room better . Thanks again!!
Yvan_donald
Well-Known Member
Hi, for me the one of the best improvment was to insulate the mids tube with active carbon 1/2 inches thick. Page 44 I have made many photos of it. At higher volume the sound of bass in transmission line can enter in the mids tube and vice versa the mids tube sounds can escape the tube and enter in transmission line affecting the clarity of the overall sound. Some people try putting some stuff on the tube to make it more proof sound. Today padding of active carbon is use as sound barrier and it's very good. They said because of these cavities the sound enter in it and make the space bigger, volume size. So in the imf mids tube it make an excellent job and improved the overall sound.Believe me because in your TLS 80 it is probably just a rool of foam as insulation. My Prof. was insulate with 4 pieces of fiberglass 2 inches X 1 inches X by the length of the tube. That's why the RSPM MK 7 have the mids above the high frequency in a complété section of the transmission line to be more isolate. Yvan.
Thanks Yvan, thanks mate. Very good advice and well worth looking into . They sound quite balanced as is but the mids when pushed could do with smoothing out a touch. Ill definately look into these modifications as they are staying with me forever. Are there more caps other than the 6 that were already replaced that need upgrading? could i also upgrade the foam to thicker grade ? And upgrade xo to be more like the mark 2?
Thanks again!
They are amazing speakers.
Yvan_donald
Well-Known Member
Hi, by just put the active carbon pad help a lot and do not reduce the tube because is composition material, put back the foam and should more than enough. For the one who have the tweeter celestion HF1300 with the black plastic cover in the back, before on my tweeter on certain passage of music I hear a small noise so I remove the back plastic, it have a small foam inside, I remove it and cut a piece of active carbon 1/2 inches the size of the foam and never ear this sound again.probably this smal noise frequency was comming from the back wave of the tweeter passing true the foam exciting a frequency comming from the plastic cover, that's my understanding of it.
Yvan_donald
Well-Known Member
Hi Nasuou, the dark green is 0.47uf, the others light green are all 2.2 uf ? Yvan.
Yvan_donald
Well-Known Member
Yep I believe so. Still have not had the time to finish the restoration, other electronic projects keep coming. Ugh I need to stop looking on the net for more vintage gear ! lol
Yvan_donald
Well-Known Member
Hi Nashou, myself I start to work on my preamp Audio research 40-42 years old, changing resistors and capacitors, tubes 12ax7 (6), nice project for this winter.Bought DAC Audio research, Moon CD player.
Yvan, I have a Yamaha B-2 I need to put back together as well as B-1 that needs a full restoration.
I got as far as checking voltages per the service manual . Of course with the V-fets out.... Solid state version of tubes . Love the V-fet sound . You should try it if you already haven't
Nashou
I got as far as checking voltages per the service manual . Of course with the V-fets out.... Solid state version of tubes . Love the V-fet sound . You should try it if you already haven't
Nashou
hello IMF thread! I recently acquired some ALS-40 that need some TLC...
I do not believe the upper woofer in my set is original... What was upper woofer driver model? Was it the KEF B200?
Also, my set has Peerless dome tweeters. Were these the original tweeters used?
Edit: Started my own thread here: https://audiokarma.org/forums/index...0-speakers-question-regarding-woofer.1046450/
I do not believe the upper woofer in my set is original... What was upper woofer driver model? Was it the KEF B200?
Also, my set has Peerless dome tweeters. Were these the original tweeters used?
Edit: Started my own thread here: https://audiokarma.org/forums/index...0-speakers-question-regarding-woofer.1046450/
Last edited:
Yvan_donald
Well-Known Member
Hi, Als 40 Mki? Yes Peerless is okey. For woofer can be2 Peerless but different from each other's with paper cone cover (plastiflex) same kind as VISATON LTS- 50. Can be1 Kef SP1014 with another brand? (Peerless) (Elac).Yvan.
Cant wait to start the mid cone carbon upgrade on the TLS80 mk1s very soon . Thanks yvan! I was actually listening to some grunge nirvana, pixies, sonic youth etc stooges , clash and dirty heavy guitar rock and they perform guite well. Not harsh at all. They really show up the inperfections of recordings , mixing and mastering. Sometimes mixes are muddy and sometimes perfect. Due to limited space mine are up against the wall so getting a bit of bass spill and the lower mids get a tad lost in the mix at times. A slight eq bump between 100 and 200hz helps with filling the lower mids out a bit. As on the frequency graph i notice a dip here as well as between 500hz and 1khz . Is it worth changing / upgrading all the original components on the crossover and not just the elcaps? Still early on in my listening and i am spending more time listening and enjoying rather than analysing and equalizing ...which is a great sign! So enjoying to listen to . And they handle loud rock fine at loud enough levels for most people to get the energy feels. Next listens will be the textures of jazz and classical !
