Do you have a question for the Magnepan factory?

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SteveFord

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Re: Do you have a question for the Magnepan factory?
« Reply #120 on: 28 Sep 2012, 09:00 pm »
When can we expect to see an updated MG12?

SteveFord

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Re: Do you have a question for the Magnepan factory?
« Reply #121 on: 1 Oct 2012, 09:51 pm »
The Magic 8 Ball says Prognosis Not Good.
It seems most people jump from the MMGs to the 1.7s.

guest61169

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Re: Do you have a question for the Magnepan factory?
« Reply #122 on: 26 Oct 2012, 11:09 pm »
I've seen some 1.7s (pics and in person) and the tuning dot spacing is different on each speaker.  How do they determine the spacing and why wouldn't they be symetrically placed? (ie. same spacing on left speaker as the right speaker)

SteveFord

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Re: Do you have a question for the Magnepan factory?
« Reply #123 on: 27 Oct 2012, 02:40 am »
Noway,
No way can I get an answer on this one - proprietary info, I'm afraid.

You'd think the spacing would be symetrical, wouldn't you?

My guess is the answer can be found in this article regarding spatial cues:
http://electronics.howstuffworks.com/virtual-surround-sound.htm

studiotech

Re: Do you have a question for the Magnepan factory?
« Reply #124 on: 27 Oct 2012, 03:04 am »
I've seen some 1.7s (pics and in person) and the tuning dot spacing is different on each speaker.  How do they determine the spacing and why wouldn't they be symetrically placed? (ie. same spacing on left speaker as the right speaker)

I'm pretty sure it has to so with spreading out the resonances of the membranes btw the left and right speakers, so there not one strong resonance.  Large planars are really like a stretched drum head, so you can imgine that they resonant just like a drum head.  Ever seen a drummer put little squares of tape or foam on a drum head?  It stops some of the ringing and overtones.  I imagine the dots are doing the same thing.

Greg

Davey

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Re: Do you have a question for the Magnepan factory?
« Reply #125 on: 27 Oct 2012, 03:04 am »
The answer is right here (in another thread) fellas.

http://www.audiocircle.com/index.php?topic=110161.msg1146057#msg1146057

Same reason on the larger speakers as on the MMG's.

Dave.


Davey

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Re: Do you have a question for the Magnepan factory?
« Reply #126 on: 27 Oct 2012, 03:08 am »
Here's a photo of the impedance sweeps of my left/right (woofer only) MMG panels.  Notice there are six different peaks and the two lowest frequency peaks from each panel do not line up with each other.

Hope that helps.

Dave.



guest61169

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Re: Do you have a question for the Magnepan factory?
« Reply #127 on: 27 Oct 2012, 04:40 am »
Thank you for the tuning dot info.   Makes sense.

SteveFord

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Re: Do you have a question for the Magnepan factory?
« Reply #128 on: 27 Oct 2012, 10:09 am »
That tears it.
From now on it's do you have a question for Davey!

MGbert

Re: Do you have a question for the Magnepan factory?
« Reply #129 on: 28 Oct 2012, 03:09 pm »
@ Davey:

 :scratch: Pardon my ignorance, but why would spreading out the impedence humps affect the sound?  I can see an impedence bump affecting the flow of power from an amp, but why make the two channels act differently, especially since the bumps seem minor (at most 0.3 ohm difference).

MGbert

Davey

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Re: Do you have a question for the Magnepan factory?
« Reply #130 on: 28 Oct 2012, 06:19 pm »
It's not really the magnitude of the impedance peaks that are of interest.  Since these are transducers with much less powerful motors than conventional drivers....and they are essentially resistive....the magnitude of the peaks is not indicative of the SPL rises created by the membrane sections.

If I were to take six different measurements with the microphone very close to the center of each of those "sections" you'd see a much more exaggerated effect.

An impedance sweep is a much easier way to determine their frequency.  You can see visually the resonant frequency of each section and not deal with all the variables (and spend all the time) involved in SPL measurements.

It's not easy to subjectively evaluate the effect of the tuning buttons since most folks only have one set of speakers.  I have two sets (actually three  :)) sets of MMG's and I've auditioned two left speakers and also two right speakers.  The two pairs sound different from each other in the bass area.  I have to attribute that to the sympathetic panel tuning you realize when pairing speakers like that.

The power amp (a good one) couldn't care less about small impedance peaks like this.  It's functioning as a voltage source and the very small current changes at these resonant points are minor.

Hope that helps.

Cheers,

Dave.

MGbert

Re: Do you have a question for the Magnepan factory?
« Reply #131 on: 28 Oct 2012, 09:58 pm »
@ Davey:

Thanks for the quick and detailed reply.  So these peaks serve as a "fingerprint" of more significant audible dips and peaks.  Makes sense, but I wish at times like this my engineering training was in electrical vice structural...  :)

MGbert

SteveFord

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Re: Do you have a question for the Magnepan factory?
« Reply #132 on: 16 Dec 2012, 09:02 am »
Is there a a factory recommended way to remove dog and cat hair from the Magnepan socks?
I've heard good things about the Swiffer Duster.

Wendell:
I haven't been asked that one. How about duct tape as you would remove lint from a suit?

Me:
Isn't wrapping the family pet in duct tape considered to be cruely to animals?
Sounds effective, though...

berni

Re: Do you have a question for the Magnepan factory?
« Reply #133 on: 16 Dec 2012, 11:55 am »
Is there a a factory recommended way to remove dog and cat hair from the Magnepan socks?
I've heard good things about the Swiffer Duster.

Wendell:
I haven't been asked that one. How about duct tape as you would remove lint from a suit?

Me:
Isn't wrapping the family pet in duct tape considered to be cruely to animals?
Sounds effective, though...
The swiffer is better on dust, but it can help. You could try some rollers which are used for clothes to remove hair. The rubber on them can catch the hair, after rinsing with cold water they are ready to be used again.

SteveFord

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Re: Do you have a question for the Magnepan factory?
« Reply #134 on: 4 Jan 2013, 03:47 pm »
My wife would like to know how many divorces are attributable to the Tympanis, hmmmm?
She then added "you guys are all crazy".

I wonder what she meant by that? 

josh358

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Re: Do you have a question for the Magnepan factory?
« Reply #135 on: 5 Jan 2013, 12:44 am »
My wife would like to know how many divorces are attributable to the Tympanis, hmmmm?
She then added "you guys are all crazy".

I wonder what she meant by that?
Well, Wendell does say the market for Tympanis is limited because you need a separate room. Separate bedroom, perhaps?

MGbert

Re: Do you have a question for the Magnepan factory?
« Reply #136 on: 5 Jan 2013, 02:37 am »
My wife would like to know how many divorces are attributable to the Tympanis, hmmmm?
She then added "you guys are all crazy".

I wonder what she meant by that?

She obviously is mistaken... she thinks we're all on the Planar Asylum!  (well, actually, some of us are, but around here we PRETEND to take our meds...)   :lol:

MGbert

rw@cn

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Re: Do you have a question for the Magnepan factory?
« Reply #137 on: 6 Jan 2013, 03:05 pm »
Do they still sell Tympanis?

decal

Re: Do you have a question for the Magnepan factory?
« Reply #138 on: 6 Jan 2013, 03:11 pm »
Quote
Do you have a question for the Magnepan factory?

Yes, I do have a question. Will you send me a pair of  20.7's for free?  :fishing:

SteveFord

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Re: Do you have a question for the Magnepan factory?
« Reply #139 on: 6 Jan 2013, 03:14 pm »
On eBay land and they'll get back to you on the 20.7s sooner or later.