FWI: 3.7 info up on the Tweaks Page

Excellent!! :-)) nt, posted on August 31, 2015 at 18:16:21
andyr Manufacturer Posts: 12550 Location: Melbourne Joined: September 2, 2000	.

Nice, thank you Neo & Mart!, posted on August 31, 2015 at 18:53:11

Cory M.
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Posts: 1172
Location: Midwest
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Perhaps I'll upgrade to them some day... for now, my IIIA's just sound so darn good.

I did hear a pair at Audio Perfection in Minneapolis, driven by A.R. gear, and they are everything that they claim to be. Beautiful coherence from top to bottom. Very musical indeed.

I've been meaning to tell you also, congrats on the upgrade, Neo. I've read your posts about them with much curiosity, and am looking forward to anything else you have to say, especially since we have traveled down similar paths in audio.

Best,

Cory

RE: FWI: 3.7 info up on the Tweaks Page , posted on August 31, 2015 at 21:20:39
A.Wayne Audiophile Posts: 2527 Location: Front row center Joined: November 30, 2011	I was not able to find could you post up a link .......

RE: FWI: 3.7 info up on the Tweaks Page , posted on August 31, 2015 at 22:12:54
Roger Gustavsson Audiophile Posts: 2058 Location: Huskvarna Joined: February 12, 2010	http://www.integracoustics.com/MUG/MUG/tweaks/neolith/

RE: FWI: 3.7 info up on the Tweaks Page , posted on September 1, 2015 at 07:20:24
Davey	Holy smokes! I got a headache trying to follow that schematic. :) Dave.

along the lines of Davey, how much different are your 2 XOs?, posted on September 1, 2015 at 08:40:07

Mart
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How does your excellently-detailed tweak schematic differ in circuit logic from your original more-legible model?
... just my 2�

♪ moderate Mart ♫

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... MUG/tweaks/neolith/MG37_schematic_full_2.png

I got a headache, posted on September 1, 2015 at 17:57:02
neolith Audiophile Posts: 4842 Location: Virginia Joined: February 21, 2002 Contributor Since: December 2, 2004	So did I, and when I got done I got another headache trying to verify that it was correct. A true engineering schematic would be very simple to follow but I wanted to match the actual wiring with colors to a schematic for those who are not adept at translating a schematic to the actual wiring. "Our head is round in order to allow our thoughts to change direction." Francis Picabia

RE: along the lines of Davey, how much different are your 2 XOs?, posted on September 1, 2015 at 18:00:37
neolith Audiophile Posts: 4842 Location: Virginia Joined: February 21, 2002 Contributor Since: December 2, 2004	The only difference is the insertion of the jumper and fuses for the mid-driver and tweeter. Obviously the xo above is a helluva lot easier to follow but as I told Davey, a novice might have trouble translating it to the actual wiring. "Our head is round in order to allow our thoughts to change direction." Francis Picabia

RE: I got a headache, posted on September 2, 2015 at 06:42:32
A.Wayne Audiophile Posts: 2527 Location: Front row center Joined: November 30, 2011	I dont believe that schematic is drawn correctly ...

I think you are right., posted on September 2, 2015 at 13:58:53
neolith Audiophile Posts: 4842 Location: Virginia Joined: February 21, 2002 Contributor Since: December 2, 2004	I looked at it again last night and I couldn't quite get a hold of it in my head (ouch). (Un)fortunately, I am at my beach house and don't have access to my notes but I think I goofed. I may be able to work it out but then again it may have to wait a week. Sorry for any confusion. "Our head is round in order to allow our thoughts to change direction." Francis Picabia

if that was your intent, then shouldn't it resemble..., posted on September 2, 2015 at 19:58:38

Mart
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... just my 2�

♪ moderate Mart ♫

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MG37_schematic_full_3.png

Absolutely!, posted on September 2, 2015 at 20:03:52

neolith
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I found the errors of my ways and have repented. After several hours of frustration, I came up with the correct schematic and it is identical to yours. Probably could have saved some time by looking at your post first :<. Your modification is correct. Please change it on the tweaks page. Thanks go to you and apologies to everyone else.

"Our head is round in order to allow our thoughts to change direction." Francis Picabia

guesstimated reverse engineer of midrange planar-magnetic driver's acoustic response has proven to be elusive, posted on September 4, 2015 at 19:42:21

Mart
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I knew it have to have been re-engineered to have the MG3.7 reproduce step-function. That's why the new impedance didn't alarm me, initially. However, in retrospect, increasing the impedance makes me think it's lighter which raises the suspension's natural frequency too. I know I'm missing something.

... just my 2�♪ moderate Mart ♫

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RE: guesstimated reverse engineer of midrange planar-magnetic driver's acoustic response has proven to be elusive, posted on September 7, 2015 at 07:01:01

Davey

Forget about the crossover for a second.....How did they go from a 3.5 ohm driver in the 3.6 to an 8 ohm driver in the 3.7??
Can somebody explain that one to me?? They laid down double the number of traces on the mylar??

Dave.

RE: guesstimated reverse engineer of midrange planar-magnetic driver's acoustic response has proven to be elusive, posted on September 7, 2015 at 08:24:49

Mart
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I don't know.

If Magnepan did double the length, then logistics most probably dictate that they voice foil coiled both sides of the mylar diaphragm. A pricey choice which makes me highly dubious due to QC rejection ratios of what I suspect remains a highly skilled craftwoman process.

I was speculating that they used a smaller AWG foil previous employed exclusively on tweeters along with the comparable tighter packed magnets. Then, you would merely have a double wide tweeter. That may be why the bass panel has a little more impedance too. I'm betting this new configuration made the THD plummet. Another no small accomplishment for a Maggie. Right behind reproducing a step-function which remains their HUGE primary accomplishment here.

Again, I don't know.

... just my 2�♪ moderate Mart ♫

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RE: guesstimated reverse engineer of midrange planar-magnetic driver's acoustic response has proven to be elusive, posted on September 7, 2015 at 10:28:02
Roger Gustavsson Audiophile Posts: 2058 Location: Huskvarna Joined: February 12, 2010	As I wrote in the other thread. The midrange has 11 strips of magnets, earlier models 13. The foil is a single path, about 1 m long, cross section 0.075"x0.01". That is 0.56 ohm/m. The 3.6 has a thinner and longer wire, 0.84 ohm/m. The mids of the 3.7/3.7i is driven over a smaller area but the force created by the thicker conductor is higher.

RE: guesstimated reverse engineer of midrange planar-magnetic driver's acoustic response has proven to be elusive, posted on September 8, 2015 at 06:27:54
DrChaos Audiophile Posts: 2063 Location: San Diego Joined: July 13, 2009	So how is the impedance higher, unless there is a micro transformer somewhere? What a mystery....

RE: guesstimated reverse engineer of midrange planar-magnetic driver's acoustic response has proven to be elusive, posted on September 9, 2015 at 07:52:51
Davey	More inconsistencies: According to the 3.7 description on the "articles" page, the midrange is inverted. http://www.integracoustics.com/MUG/MUG/articles/speakers.html Neo's schematic shows the midrange connected with normal polarity. http://www.integracoustics.com/MUG/MUG/tweaks/neolith/ Dave.

RE: guesstimated reverse engineer of midrange planar-magnetic driver's acoustic response has proven to be elusive, posted on September 9, 2015 at 10:31:05
Roger Gustavsson Audiophile Posts: 2058 Location: Huskvarna Joined: February 12, 2010	There is no mystery about the impedance. Sorry for my bad typing above, the midrange conductor is about 14 m long in the 3.7/.7i. It is just single long run = 8 ohm. The midrange conductor in the rest of 3-series is different, about 17 m long but split into two loops connected in parallel, each 7 ohm = 3.5 ohm.

"thicker" / "thinner" refers to the 10.mil dimension? _ �nt�, posted on September 15, 2015 at 10:06:11
Mart Bored Member Posts: 31273 Location: upstate NY Joined: June 6, 2001 Contributor Since: June 25, 2000	... just my 2�♪ moderate Mart ♫ ☺ Planar Asylum where speakers are thin & music isn't

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FWI: 3.7 info up on the Tweaks Page

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