mccarty350
Super Member
Thats okay Canuck was going to take a look.
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Sent from my SPH-L710 using Tapatalk
IMF owners thread!
- Thread starter canuckaudiog
- Start date
mccarty350
Super Member
My tweeter orientation is very different.
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Sent from my SPH-L710 using Tapatalk
I understand that but what would that have to do with the general hight of the drivers. I have two factory stock speakers here with totaly different design and size, but the manufacturers put the mids and tweeters at the same "Hight"
A tip that I could give you before you fabricate something is try them at different hights. Use milk crates , lamp tables, a 2x4 under the front only to tilt them back.
mccarty350
Super Member
The height of my drivers is radically different from yours if you look at the photo of the baffle because on Professional Monitors and RSPM VII's the tweeters are placed differently thus the different height that mine sit at in relation to the floor. As a result mine would need a higher stand than yours in order to reach the same ear level height. On mine the tweeters are placed below the mids and this was considered an 'advancement' as the VII's and Professional Monitors came afterwards, I'm assuming it was something to 'enhance' imaging. Whether that change was an beneficial or not I don't know, I'm just saying that the tweeters on mine are below the mids while on yours they are above and the height from the ground on the tweets is different between ours.
I have already been experimenting with different stands that I already have and objects in the front that provide varying levels of tilt-back, etc.
I have already been experimenting with different stands that I already have and objects in the front that provide varying levels of tilt-back, etc.
mccarty350
Super Member
Thus my statement about whether or not it was a benefit being questionable. Plenty of speakers where the accountants cheapened them out on the next generation so no argument there, I'm just stating and explaining why mine are different etc. from a measurement perspective.
mccarty350
Super Member
HAHAHA...I was kind of thinking the same 
canuckaudiog
On a quest for high fidelity
The 250s are really that big? Wow, I had no clue. DANG. I always thought they were shorter 
I'll getcha those measurements tomorrow John
I'll getcha those measurements tomorrow John
c-atle-79bay
Super Member
Had a moment in synergy last night with my studios. Onkyo a809 just had full control of them listening to pantera, vulgar display of power, the drums were just coming in hard and fast and no mush or "same tone" bass at all. Onkyo is on the bench now, dexit job has created some issues, sure I just disconnected something. More later on that.
I was number 2 on a set of 250s a couple weeks ago.
I was number 2 on a set of 250s a couple weeks ago.
canuckaudiog
On a quest for high fidelity
That's great to hear! I've always liked Onkyo's older gear. Even some of their newer stuff is good. They make solid amplifiers (IMO, their best stuff) which IMFs benefit from.
Guys I am closing in on running my IMFs with tube power. The Sansui 500a project I am working on is getting closer and closer to completion - I have placed the last order for parts. I imagine in a couple of weeks it'll be totally done and I'll be sipping on a glass of rum, relaxing to some sweet tube warmth through the IMFs. I am pretty curious to see how things turn out.
c-atle-79bay
Super Member
The A809 is a beast, the construction is great. Sound deadening throughout, all mechanical switches. Not certain of the amplifier type, just learning about areana, stk, transistor,mosfet etc. But it has 18,000 UF(?) and not certain if that's large or not.
Do over, I find that my IMF's are just really good at imaging and placing instruments with what seems like great accuracy. Is this an IMF characteristic? Or Did i just get lucky with my placement and space? I have linn sara's that just seem so spacy and light and airy, but the instruments sound spread out, too much so, but I like the airiness that they have. Or am I just at one of the inherent "compromises" of speakers?
Do over, I find that my IMF's are just really good at imaging and placing instruments with what seems like great accuracy. Is this an IMF characteristic? Or Did i just get lucky with my placement and space? I have linn sara's that just seem so spacy and light and airy, but the instruments sound spread out, too much so, but I like the airiness that they have. Or am I just at one of the inherent "compromises" of speakers?
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canuckaudiog
On a quest for high fidelity
Placement I imagine will fix those sorts of issues. But, one thing I can say is that IMF was ahead of the game. They employed two tweeters to cover the the high range - which shows they understood the shortcomings of tweeters from then. In other words, they wanted the best. It is a difficult and more costly approach to achieving excellent HF response but they went for it anyways.
Just do a comparison, how many other speakers do you see attempting to employ two tweeters to cover anything above around 3kHz? Not many. And from what I have read, this is where tweeters from that era fall apart - they can't cover from say, 4-5khz all the way up to 20kHz reliably on their own.
The reason I mention this is because I feel the HF response of a speaker is critical to its imaging capabilities. So when you say, is the ability of the IMF to place instruments so pinpoint a characteristic? I say yes because they were way ahead of their time and really understood speaker design, and of course that is what I have experienced from IMF speakers myself.
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Switch one speaker's wire around at the connectors (flip polarity) and see if the imaging and bass response change for the better. If they do, your speakers were wired out of phase with each other which destroys the imaging and bass response.
If so, then you'll have to check absolute polarity or consistent polarity on both channels from source to speaker and maybe even inside the speaker to drivers if they have ever been worked on.
John,
My stands appear to be original and factory by everything the previous owners knew about their brother/uncle's purchase of them. That they are wood probably had to do with having to add more or less weight to shipments from England.
They are 5.75 inches / 140 mm tall. I think there are pictures of them in my thread or this thread when I introduced them to you all.
Bart
My stands appear to be original and factory by everything the previous owners knew about their brother/uncle's purchase of them. That they are wood probably had to do with having to add more or less weight to shipments from England.
They are 5.75 inches / 140 mm tall. I think there are pictures of them in my thread or this thread when I introduced them to you all.
Bart
gamgee-fidel
Member
TLS 80 Stands?
My TLS 80s have a recessed plywood base with four adjustable (SORT OF) screw-feet. I have them leaning back somewhat. Will they benefit from lifting them off the ground and giving them the 5 degree lean that the stands provide. I don't know if there is enough room for the wooden stands in the pdf plan I just downloaded. Any tips?
Also, the left channel has a bass/midbass chuffing distortion on one track of piano music. That is the only track i can hear it on. Would that be crossover related, or could the driver surround have loosened-stretched to the point that the voice coil/cone assy is sagging.:scratch2:
My TLS 80s have a recessed plywood base with four adjustable (SORT OF) screw-feet. I have them leaning back somewhat. Will they benefit from lifting them off the ground and giving them the 5 degree lean that the stands provide. I don't know if there is enough room for the wooden stands in the pdf plan I just downloaded. Any tips?
Also, the left channel has a bass/midbass chuffing distortion on one track of piano music. That is the only track i can hear it on. Would that be crossover related, or could the driver surround have loosened-stretched to the point that the voice coil/cone assy is sagging.:scratch2:
canuckaudiog
On a quest for high fidelity
Try cleaning the switch on the back with deoxit - might fix your problem.
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c-atle-79bay
Super Member
And this is what keeps them in my system, and the bass, love that bass. Was listening to Animals last night, realized I've hearing new music, but missing listening to the music I know and love, and wow accurate sound stage is an understatement
I'm assuming your referring to the LINN's, I really will have to try that, because I'm just not feeling them, at all. Many say the MUST be absolutely solidly in place, or the isobaric action will not work right. Could be, I'm familiar with the hiquphon and the fact that i get poor sound stage in baffling, because in my nexus 250 they are airy and accurate.
This is part of the reason why I want, still in pipe dream status, swap in the hiquphon for the super tweeter, figure the KEF tweeter will keep the good solid voicing and the hiquphon will handle the higher registers with easy. First attempt will be a franken swap.
mccarty350
Super Member
Great critical analysis and observations. Something I wondered about as well. My caps are in but I've been on the road all week...excited to get working on them, hopefully I can muster the energy this weekend to get rolling on the recap.