here is one of my mtm with amt
not completely off center, just a little sideways
measures well, sounds very neutral, coherent
Audio Pages: MTM with Vifa 13WH-00-08 and AMT tweeter
not completely off center, just a little sideways
measures well, sounds very neutral, coherent
Audio Pages: MTM with Vifa 13WH-00-08 and AMT tweeter
Adason:
Love the INFINITY REFERENCE STANDARD RS II and II-B!
It was with old Infinityspeakers my love for hifi starts !
My sister had a Infinity Column II that she bought back in 1974, with Sansui preamp and amp etc.
Around 1989 a bought the Column´s from my sister and renovate the speakers, and around 2000 i bought a par of Infinity IRS Sigma.
Had trubble with getting the Sigma´s play "out", and tested at least 15 different amp´s until i test a Pass Labs x-350 "and the door´s opened".
My most expensive audioequipment at the time was a Harman Kardon AVR 8500, and the used Pass Labs was 3 times more expensive.
From that time my hifi interest grow, and with 7 disc herniation and a titanbrick at 3 levels in my neck i found high level music much better painkiller than pill´s.
So i rather drive a trash-car and spend money on my hifi, because i don´t give a **** about impress the neighbors 🙂
That Vifa midrange was real impressive :-o
/John
Love the INFINITY REFERENCE STANDARD RS II and II-B!
It was with old Infinityspeakers my love for hifi starts !
My sister had a Infinity Column II that she bought back in 1974, with Sansui preamp and amp etc.
Around 1989 a bought the Column´s from my sister and renovate the speakers, and around 2000 i bought a par of Infinity IRS Sigma.
Had trubble with getting the Sigma´s play "out", and tested at least 15 different amp´s until i test a Pass Labs x-350 "and the door´s opened".
My most expensive audioequipment at the time was a Harman Kardon AVR 8500, and the used Pass Labs was 3 times more expensive.
From that time my hifi interest grow, and with 7 disc herniation and a titanbrick at 3 levels in my neck i found high level music much better painkiller than pill´s.
So i rather drive a trash-car and spend money on my hifi, because i don´t give a **** about impress the neighbors 🙂
That Vifa midrange was real impressive :-o
/John
Okey, so i have modified the MTM for a first try out.
I have prepered to move the tweeter in about 7 cm, but that includes "sabotage" of the midrangecabinett and steal maby 1 liter.
/John
I have prepered to move the tweeter in about 7 cm, but that includes "sabotage" of the midrangecabinett and steal maby 1 liter.
/John
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Simulating the room and multiple sources in a reliable and consistent way is questionable. I'd do that during the design phase to see if a concept makes sense, and has potential. I think you'd get to the reasons for your concerns if you could measure. I mean, don't you see it as the case already, that even if you had all your sources closely spaced, the room is still having an effect and that is unknown?
@ Adason, it's interesting to look at the eyes of a goat, who is interested only in what grows around.. and a cats eyes who hunts birds in a tree while hiding in the grass.
@ Adason, it's interesting to look at the eyes of a goat, who is interested only in what grows around.. and a cats eyes who hunts birds in a tree while hiding in the grass.
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I kind of think that time alignment might be your biggest enemy here.
It would be interesting to see you place the amt in front of the twin mids ... but you'd need to delay the amt response. Since you're doing that section passively, that is going to be a challenge.
It would be interesting to see you place the amt in front of the twin mids ... but you'd need to delay the amt response. Since you're doing that section passively, that is going to be a challenge.
From the photos that looks like the Mundorf AMT29CM1.1-R Air Motion Tweeter, that is one nice driver and out of my price range. Nothing to do with your problem but in my opinion you are cutting over a little low if it is that tweeter. The spec sheet recommends 2000 hz @ 12dB and with an Fs of 1500 hz I would be crossing closer to 3000 hz.
Is it just me, or is that the worst looking room I have ever seen for overly-lively acoustics?
No rugs, no carpets, not much stuffed furniture....
Must be full of sharp echoes! 😱
I think 8" mid is a terrible idea for an MTTM or MTM with ribbon. Much smaller units preferable:
6moons audio reviews: Gryphon Audio Designs Mojo
Bass units can go almost anywhere, IMO.
This is an Allison IC20:
A wallmounter in effect. The bass output is reinforced by the floor, so effectively WWMTTM. Clever.
No rugs, no carpets, not much stuffed furniture....
Must be full of sharp echoes! 😱
I think 8" mid is a terrible idea for an MTTM or MTM with ribbon. Much smaller units preferable:
6moons audio reviews: Gryphon Audio Designs Mojo
Bass units can go almost anywhere, IMO.
This is an Allison IC20:
A wallmounter in effect. The bass output is reinforced by the floor, so effectively WWMTTM. Clever.
Mtidge:
Yes its that Mundorf tweeter, but i xover at 1850hz 18dB, and it works perfect!
Cant stand Beaming and at about 2050 hz a 8 inch midrange beaming, so i keeping me 200 hz under that number.
System7:
My room have 15mm rugs on the floor, 10 sound-eating carpets AND aucustic regulated treatment in the walls.
So i don't know what rum you talkning about?
/John
Yes its that Mundorf tweeter, but i xover at 1850hz 18dB, and it works perfect!
Cant stand Beaming and at about 2050 hz a 8 inch midrange beaming, so i keeping me 200 hz under that number.
System7:
My room have 15mm rugs on the floor, 10 sound-eating carpets AND aucustic regulated treatment in the walls.
So i don't know what rum you talkning about?
/John
Are the two midranges each in a separate box? Can you try the tweeter in-between midranges?
If not, try making a cheap test box out of cardboard orfoam or MDF. So you can compare how it sounds.
If not, try making a cheap test box out of cardboard orfoam or MDF. So you can compare how it sounds.
LewinskiH01:
Yes, the two midranges are in each separate 16 liter box filled with 85% of 2 different fillings.
Because the Aerogel kone in the Audax are so thin, so i will minimize the reflexsound inside so it don´t come out again.
And yes, i´ve have to get back to the "first" MTM i build, with ordinary tweeter in the middle.
Only takes me 30 hour´s to find out hahaha..And the glue is now drying ;-)
/John
Yes, the two midranges are in each separate 16 liter box filled with 85% of 2 different fillings.
Because the Aerogel kone in the Audax are so thin, so i will minimize the reflexsound inside so it don´t come out again.
And yes, i´ve have to get back to the "first" MTM i build, with ordinary tweeter in the middle.
Only takes me 30 hour´s to find out hahaha..And the glue is now drying ;-)
/John
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Resembles Goebel Divins...MTM with 8" mids and AMT tweeter with waveguide. Nice. And nice and big room too!
Gobel High End - Ultra High End Speakers and Cables
Gobel High End - Ultra High End Speakers and Cables
Ordinary...as in dome tweeter? Why not the AMT so you test the same drivers in different configurations and make sure your conclusions aren't skewed by the different tweeter?
LewinskiH01 :
No i mean to use the Mundorf AMT , but have it between the midranges ( as usual MTM´s)
Yea i saw the Goebel Divins after my build, and it´s the "same body" but mine are more feminin in shape and Goebelá are more "spacelike/matcho"
Hard to get good tweeter´s that work down to 18-1900 Hz (exept compressed driver), the Audax TW025A28 in a waveguide sounded supergood but need around 3000hz i think.
Also have a fantastic SRT-7 sealed ribbon tweeter from Viawave, but it can´t handle much power if you use it from 18-2000 hz....about 17 watt RMS power handling and 40 in peak´s.
Everyting in hifi is compromises
And i have re-build the MTM´s, so maby can try it out agian tomorrow 🙂
/John
No i mean to use the Mundorf AMT , but have it between the midranges ( as usual MTM´s)
Yea i saw the Goebel Divins after my build, and it´s the "same body" but mine are more feminin in shape and Goebelá are more "spacelike/matcho"
Hard to get good tweeter´s that work down to 18-1900 Hz (exept compressed driver), the Audax TW025A28 in a waveguide sounded supergood but need around 3000hz i think.
Also have a fantastic SRT-7 sealed ribbon tweeter from Viawave, but it can´t handle much power if you use it from 18-2000 hz....about 17 watt RMS power handling and 40 in peak´s.
Everyting in hifi is compromises
And i have re-build the MTM´s, so maby can try it out agian tomorrow 🙂
/John
Help on wiring
Hi all, @jawen I was interested by your thread, I am using similar tweeter but planar mids in MTM but I am not sure about wiring because of the impedance differences of having 2 mids 1 tweeter. You talked about your wiring to get back to 8 ohms but could you explain a little more please?
These are the measured impedance of all my drivers: and the spec sheets in images along with a graphic of the build.
Bass is 6.20hm matched pair
Mids matched pair is 7.9ohm (2xmids)
Mids matched pair is 8.2ohm (2xmids)
Tweeters matched pair is 5.2ohm
I have a standard test crossover Drayton audio 3 way crossing at 375 and 3000 while I learn how to produce a proper custom crossover but how to match the driver impedance by wiring the 2 mids per channel like you have.
Comments from others welcome, hope ok to add this to your thread but seems you know on this specific topic.
Dan
Hi all, @jawen I was interested by your thread, I am using similar tweeter but planar mids in MTM but I am not sure about wiring because of the impedance differences of having 2 mids 1 tweeter. You talked about your wiring to get back to 8 ohms but could you explain a little more please?
These are the measured impedance of all my drivers: and the spec sheets in images along with a graphic of the build.
Bass is 6.20hm matched pair
Mids matched pair is 7.9ohm (2xmids)
Mids matched pair is 8.2ohm (2xmids)
Tweeters matched pair is 5.2ohm
I have a standard test crossover Drayton audio 3 way crossing at 375 and 3000 while I learn how to produce a proper custom crossover but how to match the driver impedance by wiring the 2 mids per channel like you have.
Comments from others welcome, hope ok to add this to your thread but seems you know on this specific topic.
Dan
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Ah I think I got how you did it
“2x8 Ohm´s coils connected in serie at the bobbin for 16 Ohm, and parallelconnected outside so 8 Ohm”
2 voice coils per driver. The bg radia Neo10 only have one connection (coil - although planar so not really a coil). So all the matching needs to be done in the crossover design.
“2x8 Ohm´s coils connected in serie at the bobbin for 16 Ohm, and parallelconnected outside so 8 Ohm”
2 voice coils per driver. The bg radia Neo10 only have one connection (coil - although planar so not really a coil). So all the matching needs to be done in the crossover design.