This is the schematic that I got from Falcon Acoustics, Jerry says it's the same thing
IMF owners thread!
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This is the schematic that I got from Falcon Acoustics, Jerry says it's the same thing
Had a sweep done on my CM3'S, though the old IMF website says that these are supposed to dig down to 29Hz the start dropping off abruptly at just above 100Hz. I can see the factory fudging the numbers a bit but they drop off about 20db's, not even close.
I had the sweep done by Meniscus Audio, they said that they didn't think that the port was doing anything, or that the surrounds had dried out. They also mentioned playing around with the foam in the port, however that would definitely be a last resort as I prefer to keep them as original as possible. Any suggestions on what might be going on to have lost so much of the low end? Seems they use these same woofers in many different systems, anyone experience this problem with these woofers?
Thanks!
I had the sweep done by Meniscus Audio, they said that they didn't think that the port was doing anything, or that the surrounds had dried out. They also mentioned playing around with the foam in the port, however that would definitely be a last resort as I prefer to keep them as original as possible. Any suggestions on what might be going on to have lost so much of the low end? Seems they use these same woofers in many different systems, anyone experience this problem with these woofers?
Thanks!
ThatguyinAK
New Member
Have you recapped the crossover?
The crossovers are completely new as the originals were missing when I bought the speakers, the capacitors are from the capacitor rebuild kit from Falcon Acoustics. Jerry also sold me the rest of the parts as well as sending me the schematic to build them. I had a local shop, Meniscus Audio, actually do the build as I wanted them to be done right. The only difference that I am aware of is that the coils are not laminate, the original inductors were laminate. Jerry did not have the laminate inductors, Chad at Meniscus Audio didn't believe that it would make any noticeable difference
The original midrange drivers were also missing, those were replaced by MONOCOR's MSH-115's replacement mid's for the CM3'S
If you have the speakers back, I would play around with some software like Function Generator - I run this in my iPad and then use Sound Tools on my phone to watch the decibel response.
After seeing where things stand, start experimenting. Are there any holes in the cabinet? Do any of the drivers or the rear terminal plug need new gaskets or sealing caulk?
also check the speakers one at a time, if there was a cabinet or driver flaw from age or part failure, I would assume unequal problems. If both speakers measure identically, I would start to look at the new parts and how they are installed.
After seeing where things stand, start experimenting. Are there any holes in the cabinet? Do any of the drivers or the rear terminal plug need new gaskets or sealing caulk?
also check the speakers one at a time, if there was a cabinet or driver flaw from age or part failure, I would assume unequal problems. If both speakers measure identically, I would start to look at the new parts and how they are installed.
Yvan_donald
Well-Known Member
Hi, on the TLS 50 MKI, you have to check for crack, happen some tube become loose where it's glue to the baffle. My TLS 50 MK I have the latest version of X-Over,same drivers Kef SP 1014, the mids EMI, the Peerless tweeter's and this microphone super tweter's, certainly not à coles tweeter. Same super tweeter in the MK II., maybe in latent version?
Yvan_donald
Well-Known Member
This Super Tweeter was attaché to à round plate, seems no magnet, embeded in silicone.
There is a small void in one of the woofers mounting holes, a thin slice of the pressboard baffle came off at some point. Probably at some point when the speaker was removed, stuck to the gasket. Makes me wonder if that's the one that I brought in to have the sweep done? Thanks, I'll have to fill in that gap and look to see if there's other possible leaks around the mounting holes, that pressboard isn't the smoothest media once it's machined.
It wouldn't hurt to replace all the gaskets either, they've been flattened pretty good over the years. As far as I know there are no holes anywhere. Although I cannot actually see what's plugging the holes between the woofer section and the upper section with the midrange and tweeter, I cannot pull the wires from the mid and tweeter through. I can't see what's holding them without pulling the foam loose, I don't want to pull anything loose that I don't have to. I can see the hole from the midrange and tweeter section but due to the angle I can't see into the hole. Wouldn't hurt to put some silicone or other glue into the hole just to be sure.
I assume that I can find the software at an app store?
yeah the apps I referred to are on Apple's store
if those exact ones aren't on Google there will be others that can do the same things, and testing both speakers might help narrow down where you're having trouble. I also would not want to pull out the foam!
photos would also help us get a better idea of what you're seeing
@Yvan_donald were you referring to the cardboard tube that encloses the midrange on the TLS-50's? I'm not sure if @JB1962 's CM3's have the same structure, but it is worth investigating as well
if those exact ones aren't on Google there will be others that can do the same things, and testing both speakers might help narrow down where you're having trouble. I also would not want to pull out the foam!
photos would also help us get a better idea of what you're seeing
@Yvan_donald were you referring to the cardboard tube that encloses the midrange on the TLS-50's? I'm not sure if @JB1962 's CM3's have the same structure, but it is worth investigating as well
c-atle-79bay
Super Member
If anyone were to look in the antique section of a certain public sales site in the Portland region they would find a set of imf the studio for sale. With moncor mids and updated crossovers per falcon acoustics. They were mine, I want them back but just can’t get to them.
Yvan_donald
Well-Known Member
Hi, my answer not the CM3 but for TLS 50 MKI, Clorey put photo of crossover and talk about Super tweeters. I will put some photos of my TLS 50 MKI crossover, original midranges EMI ànd the super tweeter's.
Wow yeah those speakers look great, but I’m on the wrong side of the continent (briefly hoped they were in Maine)
Yvan_donald
Well-Known Member
Hi, that's the STW of the TLS 50 MK I and MK II, do not know why someone can say it's à Cole STW, Yvan.
ThatguyinAK
New Member
That price is damn near a steal too... If I didn't already have the 80 and 50MKII I'd check into shipping them up to me. Sorry for your loss!
c-atle-79bay
Super Member
LOL, it took me forever to even sell them at that price in the first place. Seattle is a weird market, lots of score shoppers.
The woofer is an 8/30, I cannot find another 8/30 speaker. My searches find plenty of 8/22 or occasional ALS 30 models. The area ground out inside of the top section of the cabinet, seen through the midrange cutout, was needed to keep the magnet of the replacement midrange from hitting the panel that divides the woofer section from the mid and tweeter section.
The last photo shows where the wires for the mid and tweeter go through to the woofer section. As I mentioned, I can't see any caulking or whatever they used, but I cannot pull the wires through. The wires won't budge so something's in that hole besides just wires.
The black felt I added because I didn't want the transistor to vibrate on the dividing panel, being that the felt is not in the woofer cabinet I don't suspect that being the issue. That said, I have been wrong before
My first thought is still about gaskets, to make sure the driver is securely sealed to the baffle and the sound waves are traveling through the transmission line as designed.
but I’m also curious about what’s happening with the bare wires and that silver structure ?
but I’m also curious about what’s happening with the bare wires and that silver structure ?
Yvan_donald
Well-Known Member
Hi, this is for JB1962, checking in my inventory I have found an 8/30 (1) woofer,Yvan.
That silver thing is just a three Ohm resistor for the replacement midrange, I've read that a one or two Ohm resistor is needed to put the replacement midrange in line with the original but it was still a bit forward so I went with three Ohms. I'm going to check my local speaker repair shop for new gaskets, probably this week. Also I will make sure that the mounting surface is smooth with no voids before installing them
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Do you know if that is the woofer that's supposed to be in the IMF CM3?