Strange Alignment for MMG's

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medium jim

Re: Strange Alignment for MMG's
« Reply #20 on: 2 Mar 2012, 12:00 am »
Ajay:

Interesting as many find the Ribbons or Quasi Ribbons to be a bit too much or forward.  I like the place already as you said it has a lot of tube gear :thumb:

Jim

SteveFord

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Re: Strange Alignment for MMG's
« Reply #21 on: 2 Mar 2012, 02:15 am »
I could see using some sort of a super tweeter with the MMGs - unlike a lot of people I never found them to be too bright sounding.
I'm going to have to get in touch with Stereo Unlimited and see what they're doing. 
Flipping through the Planar Porn section it seems like 75% of the systems are tube in one form or another.
I've recently become a convert to ss cd player/dac/tube buffer combo which works out really well.  It's not a good vinyl set up but it didn't cost very much which is a good thing.
I'm holding off on anything expensive until I see what Eveanna Manley is cooking up for later on this year.  I trust her ears.
Didn't mean to hijack your thread - and now, back to our regularly scheduled topic...

jk@home

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Re: Strange Alignment for MMG's
« Reply #22 on: 5 Mar 2012, 01:12 pm »
Someone on the Asylum -- can't remember whom at this point -- uses a Lineaeum tweeter on his MMG's.

I know inmate Hoshi added some to his SMGas

http://www.audioasylum.com/cgi/vt.mpl?f=mug&m=145647


Letitroll98

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Re: Strange Alignment for MMG's
« Reply #23 on: 5 Mar 2012, 05:16 pm »
Quote
Now, if you want a *real* blast, try turning them so they're edge-on to you, e.g., in a "V" with you at the point. If it works (it does in some rooms, not others) you'll be amazed at and blown away by what happens.
Funny, I was thinking of trying that very thing out. 

Not to interrupt the supertweeter discussion, but an update on the above.  I didn't work.  I guess I have one of the rooms it doesn't mesh with because it was more than terrible.  I could see how it could work somewhere as the images outside of the speakers were great, but there was no center image, I mean none anywhere between the speakers, just a mush of sound. 

Because I was moving them anyway, for comparison I went through all the usual suspects using toe in's that have worked before and the "Perpendicular Placement" ™ is by far still the best.  In response to JohnR's supposition, there is a slight reduction in HF energy, approximately like using the tuning resisters.  Maybe I'll add a Linaeum supertweeter.   
:lol:

 

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Re: Strange Alignment for MMG's
« Reply #24 on: 6 Mar 2012, 03:18 am »
Funny, I was thinking of trying that very thing out. 


Not to interrupt the supertweeter discussion, but an update on the above.  I didn't work.  I guess I have one of the rooms it doesn't mesh with because it was more than terrible.  I could see how it could work somewhere as the images outside of the speakers were great, but there was no center image, I mean none anywhere between the speakers, just a mush of sound. 

Because I was moving them anyway, for comparison I went through all the usual suspects using toe in's that have worked before and the "Perpendicular Placement" ™ is by far still the best.  In response to JohnR's supposition, there is a slight reduction in HF energy, approximately like using the tuning resisters.  Maybe I'll add a Linaeum supertweeter.   
:lol:

Interesting. We're still learning about this. Did you try various placements, e.g., moving the speakers closer to you? I found that it worked well (in the room in which it worked) with the speakers quite close to me -- in the rear half of the room. No center image problem when I tried it. The backwave was pretty much aimed at the center, which I guess provided center fill.

Letitroll98

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Re: Strange Alignment for MMG's
« Reply #25 on: 6 Mar 2012, 04:14 am »
I only played with it a little bit as it seemed pretty DOA.  It was so off I thought I must have them aligned incorrectly, so I played around with slight adjustments of toe in to no avail, but that's about it.  The room is fairly small, 13.5'x10', so placement options are pretty limited (I had to decide if I wanted the master bedroom or the speakers did, I won).  They're very far out now, at the halfway point, I could try going the other way, closer to the front wall.  I think any placement has the backwave pointing in the middle if the edge is facing you, I could be missing something.  I could also try facing the membranes toward the front wall, something I thought of trying but didn't.

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Re: Strange Alignment for MMG's
« Reply #26 on: 7 Mar 2012, 03:03 am »
I don't think reversing the diaphragms would do much to the presentation. If you visualize a mirror on the front wall, you'll get a pretty good idea of where the front wall reflections will seem to be coming from. Observe the angle of the speaker in the reflection. If the angle is acute, the sound will be reduced, and vice-versa. A similar effect occurs with the sidewall reflections. Since the speakers have to be edge on, the angle is determined by both their distance from you, and their lateral position. In theory, anyway, you can adjust the ratio of the phantom speakers behind the side walls, and the delayed phantom speakers up front. That should affect the amount of center fill, and also lateral location, through at least two mechanisms. When I had it set up, the speakers were only about 3' in front of me, and I got good localization -- in fact I tested it with the Stereophile test disk of John Atkinson walking around a church ringing a cow bell and everything was where it should be.

Letitroll98

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Re: Strange Alignment for MMG's
« Reply #27 on: 7 Mar 2012, 03:30 am »
Yes, that's Stereophile Test Disc #3, I have all three.  In the Perpendicular Placement ™ the cowbells are exactly where they should be, I wouldn't even try with the edge on because it was so far off.  But you've given me some places to go here, I have the room diagrammed out with all the axial and tangential modes mapped (oblique just got too crazy by hand) so I can play with some placement options.  I'd love to get it to work because I'm a bit of a placement junkie.  The Cardas method I've come back round to lately doesn't look like it's going to be suitable in this case even tho everything you noted above seems to jibe with that method, panels point directly at the front wall midpoint, fairly close field placement.  I have some ideas, let me look at it this weekend in between St Paddy's Day nips. 

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Re: Strange Alignment for MMG's
« Reply #28 on: 7 Mar 2012, 06:40 pm »
I'll be curious to know what you find. BTW, you could consider trying HP's rule of thirds. There are theoretical reasons why sitting the same distance from the rear wall as the speakers are from the front wall will tend to cancel room modes below a certain frequency. In essence, as wavelength becomes large compared to the distance between the speakers and their lateral reflections, they wave launch becomes planar, and the reflected backwave tends to cancel the reflected front wave at your ears. So the room modes don't affect amplitude response at all. It's essentially a passive single bass array. I used that arrangement to good effect when I had my Tympani 1-D's, but my current room isn't big enough to allow it.

Letitroll98

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Re: Strange Alignment for MMG's
« Reply #29 on: 18 Mar 2012, 04:27 pm »
I'll be curious to know what you find. BTW, you could consider trying HP's rule of thirds......but my current room isn't big enough to allow it.

Same problem, with the added problem that I can't read a calendar.  So with the actual St. Paddy's day I was able to achieve some measure of success.  I had thought the same thing about the thirds or something along those lines and with the speakers much closer together and closer to the front wall and the LP further out into the room the edge on worked pretty well, not the most preferred, but good.  So with that success I continued experimenting and hit on a position almost edge on, but tilted in maybe 10° so you can just see the fronts of the speakers.  Much better depth and realistic instrument placement with unbelievable width.  Borne out in the Stereophile #3 Test Disc where an imbalance in the far right section of the 2nd cardioid mic test was now normalized.

What I'm taking from this is that with dipoles in a small room, you can pretty much throw out any standardized placement rules used for direct radiators.  I don't know if anyone out there is still taking this thread seriously, but everyone, toss your old ideas and experiment.  It's free, it's fun, and what this hobby is about.   

rw@cn

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Re: Strange Alignment for MMG's
« Reply #30 on: 18 Mar 2012, 04:44 pm »
Just a thought. Is your phase correct?

Letitroll98

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Re: Strange Alignment for MMG's
« Reply #31 on: 18 Mar 2012, 07:09 pm »
Just a thought. Is your phase correct?

Yes.

And actually I appreciate the question.  I have a zillion test discs both CD and vinyl, and correct phase is one of the first tests on all of them.  But your question made me recheck, thinking how can I excuse myself out of this one if they're hooked up backwards, but the oldtimers hasn't got completely a hold of me yet, my system is connected correctly.  However please don't take offence at the next paragraph.

Which begs a larger question.  As well meaning and polite as your post is, it brings to fore the idea that something must be wrong with me or my system, our long held audio beliefs cannot be wrong, speakers must face forward, at least in a general way.  As mentioned by others, anything else is Bose reflected sound fields or you should be using headphones.  So while donning my asbestos suit, I suggest anyone with planar's in a small room that doesn't experiment extensively is crazy.  Caveats are I haven't tried this in larger rooms or with direct radiators.  Okay, suit on, flame away, no offence will be taken.

madog99

Re: Strange Alignment for MMG's
« Reply #32 on: 18 Mar 2012, 07:52 pm »
Yes.

And actually I appreciate the question.  I have a zillion test discs both CD and vinyl, and correct phase is one of the first tests on all of them.  But your question made me recheck, thinking how can I excuse myself out of this one if they're hooked up backwards, but the oldtimers hasn't got completely a hold of me yet, my system is connected correctly.  However please don't take offence at the next paragraph.

Which begs a larger question.  As well meaning and polite as your post is, it brings to fore the idea that something must be wrong with me or my system, our long held audio beliefs cannot be wrong, speakers must face forward, at least in a general way.  As mentioned by others, anything else is Bose reflected sound fields or you should be using headphones.  So while donning my asbestos suit, I suggest anyone with planar's in a small room that doesn't experiment extensively is crazy.  Caveats are I haven't tried this in larger rooms or with direct radiators.  Okay, suit on, flame away, no offence will be taken.


I tried the strange setup in my small room and it was interesting . I have moved my Maggies by  1/2" and the sound changes . Of course I have the worlds worst room but I do like the sound , as do others . so reading about backwards out , upside down , sideways , is all fun for me to try .

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Re: Strange Alignment for MMG's
« Reply #33 on: 18 Mar 2012, 11:16 pm »
Same problem, with the added problem that I can't read a calendar.  So with the actual St. Paddy's day I was able to achieve some measure of success.  I had thought the same thing about the thirds or something along those lines and with the speakers much closer together and closer to the front wall and the LP further out into the room the edge on worked pretty well, not the most preferred, but good.  So with that success I continued experimenting and hit on a position almost edge on, but tilted in maybe 10° so you can just see the fronts of the speakers.  Much better depth and realistic instrument placement with unbelievable width.  Borne out in the Stereophile #3 Test Disc where an imbalance in the far right section of the 2nd cardioid mic test was now normalized.

What I'm taking from this is that with dipoles in a small room, you can pretty much throw out any standardized placement rules used for direct radiators.  I don't know if anyone out there is still taking this thread seriously, but everyone, toss your old ideas and experiment.  It's free, it's fun, and what this hobby is about.

Glad you found something that worked. A surprising number of people end up adopting edge-on when they try it. Also, parallel to the side walls can work, in my room it's the second-best configuration (after a conventional one).

BTW, edge-on isn't the Bose effect! It's basically a reflected image of the speakers as far from the side wall as the speakers are. Then you have the rear wave reflection from the front wall, about where it is in a conventional setup. The effect psychoacoustically is to make your room twice as wide as it is.

Letitroll98

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Re: Strange Alignment for MMG's
« Reply #34 on: 1 Apr 2012, 04:44 pm »

Interesting. We're still learning about this. Did you try various placements, e.g., moving the speakers closer to you? I found that it worked well (in the room in which it worked) with the speakers quite close to me -- in the rear half of the room. No center image problem when I tried it. The backwave was pretty much aimed at the center, which I guess provided center fill.

And........

Glad you found something that worked. A surprising number of people end up adopting edge-on when they try it. Also, parallel to the side walls can work, in my room it's the second-best configuration (after a conventional one).

BTW, edge-on isn't the Bose effect! It's basically a reflected image of the speakers as far from the side wall as the speakers are. Then you have the rear wave reflection from the front wall, about where it is in a conventional setup. The effect psychoacoustically is to make your room twice as wide as it is.

I don't remember now which forum or what post, I think it was medium jim, but somebody mentioned Rooze placement to describe edge on.  It got me on a search through the Asylum's threads (damn they're hard to navigate) and I found a bunch of posts describing several strategies.  I understand more about the theory and have had some excellent success with it approximating the one thirds placement without measurement, just by ear and sight, but ran out of time last night.  Now I have questions.

One thread's diagrams show what I have now, out into the room about a third, LP the same from the rear wall, which would seem to use the front wall as first reflection point.  Another thread, Rooze's original, seemed to say way further out, beyond halfway, and the LP centered between like headphones, using the rear wall as first reflection point.  Another seemed to show almost in the corners of the front wall, using the side and front walls as first reflection points.  Of course I'm going to try them all, but what has anyone still reading this thread had the most luck with?

Presently the placement is on the long wall.  However looking at the diagrams and comparing to my room, it looks like short wall placement may work best.  Any thoughts from anyone about this?

This is getting to be almost like a new topic, any thoughts on me starting a new thread, or is that overkill?   

josh358

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Re: Strange Alignment for MMG's
« Reply #35 on: 3 Apr 2012, 01:36 am »
I don't remember now which forum or what post, I think it was medium jim, but somebody mentioned Rooze placement to describe edge on.  It got me on a search through the Asylum's threads (damn they're hard to navigate) and I found a bunch of posts describing several strategies.  I understand more about the theory and have had some excellent success with it approximating the one thirds placement without measurement, just by ear and sight, but ran out of time last night.  Now I have questions.

One thread's diagrams show what I have now, out into the room about a third, LP the same from the rear wall, which would seem to use the front wall as first reflection point.  Another thread, Rooze's original, seemed to say way further out, beyond halfway, and the LP centered between like headphones, using the rear wall as first reflection point.  Another seemed to show almost in the corners of the front wall, using the side and front walls as first reflection points.  Of course I'm going to try them all, but what has anyone still reading this thread had the most luck with?

Presently the placement is on the long wall.  However looking at the diagrams and comparing to my room, it looks like short wall placement may work best.  Any thoughts from anyone about this?

This is getting to be almost like a new topic, any thoughts on me starting a new thread, or is that overkill?

I think the topic is so new that we lack much by way of experience to go on. I hadn't read Rooze's thread when I first tried it with my planar computer speakers, I was basically curious about how they'd sound if they weren't on a desk against the wall so tried putting them on a table in front of me. Then, on a lark, I decided to turn them so they were edge on to see what would happen. Imagine my astonishment when this vast, natural sounding soundstage opened up in front of me! From tiny speakers sitting on a table three feet in front of me, edge on. I described my experience on the Asylum, and it was Dawnrazor who pointed out Rooze's original post.

Anyway, when I tried it, my speakers were about 1/3 of the way off the rear wall, and as I said, only a few feet in front of me. I tried moving them around, but it seemed to work best when they were way back in the room near where I'd first tried it. Generally, dipole sound (well, any speaker sound) becomes more spacious as you delay the first reflections by moving the speakers as far as possible from proximate surfaces. This does mean that some sound was reaching my ears first from the wall behind my head, but it didn't pull the image back there. My guess about that is that it had to do with the angle of the speakers -- the first reflection points on the rear wall were still partly in the dipole null, so reduced in level from the front reflections, and a sufficient difference in volume will override the precedence effect, and you'll start hearing the delayed sound first. But I'm not sure on this, front/back localization is kind of funny perceptually, it depends in part on reflections (speakers in an anechoic chamber can sound like they're behind you).

Anyway, a long way of saying that more experimentation needs to be done. It may be that what works best depends on the individual room -- as I think I said, I wasn't able to get the effect to work at all when I tried it with a pair of MMG's in my listening room upstairs, perhaps because it's fairly asymmetrical. My own experiments with computer speakers were facing the long way down the room, by the way, a nice rectangle with maybe 14' wide, 20' long.

I think another thread would be cool, BTW, though I'm not sure how much participation you'd get. I'll eventually see your post either way.

Letitroll98

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Re: Strange Alignment for MMG's
« Reply #36 on: 3 Apr 2012, 02:35 am »
Yeah, I can't imagine why all planer owners don't try this, but the response has surely petered out.  Even over on the Asylum many have fallen off of the thread.  It may be because it seems to be rather hard to duplicate effectively after playing around with placements for the whole afternoon.  I've had a dickens of a time recreating what was so easy the other day, of course I didn't do anything intelligent like mark positions and toe in (the most fussy parameter it seems).  I'm confident I can get back to the magical soundstage I had in that one position, I just ran out of time yesterday after playing around. 

I didn't have much luck with the original Rooze, which I gather is the position you tried, mine sound best in conventional type positions toed out to edge on, albeit way different placements than when they face forward including the LP.  This is what the second thread over there seems to have morphed in to.  Also ran out of time to try any short wall placements.

To describe the sound when it's right is to echo Rooze's original post.  There are no speakers and no walls in my listening room.  There are only the boundaries of the recording venue.  Live recordings sound like the pictures included in the disc or LP look, with the instruments placed exactly there.  There is zero localization at the speakers, a problem that pops up on some studio recordings with normal placements, but not here.  Yet images are not amorphous blobs, if anything there is more delineation between performers, just in a more natural way.  I can hear the cowbell much more specifically even in the spaced omni recording, and the cardioid although wider and deeper, is more naturally placed.  To echo Rooze again, I don't think I could ever go back.

Thanks muchly for the feedback even if it's only from Josh so far.  I may have to log in to the Asylum to get any other conversation on this.  If you don't hear from me for a few weeks, send a rescue dog, pay the ransom, get the doc to sign the release papers, whatever is needed cause they got me locked up someplace over there.

Davey

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Re: Strange Alignment for MMG's
« Reply #37 on: 3 Apr 2012, 02:07 pm »
It's just too weird for most Maggie owners.  Like many hobbyists, they're creatures of habit and this type of thing makes most raise an eyebrow.  :)

The reason it works (can work) is because Maggies have a very good power response (wide) with the symmetrical polar response.

Everyone should at least try it.

Cheers,

Dave.

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Re: Strange Alignment for MMG's
« Reply #38 on: 3 Apr 2012, 09:12 pm »
Hey, I not only tried it, but I rather liked it. I had a problem getting a solid center image, but I only tried a few positions - need to revisit this. Another impediment is the two separate configurations of my room - screen up, screen down. Still, it had the lifelike presentation of a pair of Radialstrahlers - quite stunning.

mark funk

Re: Strange Alignment for MMG's
« Reply #39 on: 3 Apr 2012, 09:36 pm »
Years and years ago I had MG-1s or was it MG-2s? I use to play around like that too, be moving them all over the dam place. MMGs still $600? I never had the power needed back then to really turn them on but I do now and $600 is a real deal Ha!


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