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My New Maggies - Part 2 - The Unveiling

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Posted on August 22, 2014 at 11:12:28
drugolf
Audiophile

Posts: 26
Location: Idaho
Joined: July 24, 2014



Moving on from my initial post to see what these MGIIa's are in need of.

I got them working but one did not sound nearly like it should. I have now disassembled it to see what I am dealing with. There are some obvious issues to my eye but I am sure there are many other more experienced eyes that could tell me what they think here. Tweeter wire needs replacement and there looks to be some very small holes in the mylar?

What is next? See photos. (Can't I post more than one photo at a time?)

 

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RE: My New Maggies - Part 2 - The Unveiling, posted on August 22, 2014 at 11:16:28
drugolf
Audiophile

Posts: 26
Location: Idaho
Joined: July 24, 2014



Photo 2

 

RE: My New Maggies - Part 2 - The Unveiling, posted on August 22, 2014 at 11:17:04
drugolf
Audiophile

Posts: 26
Location: Idaho
Joined: July 24, 2014



Photo 3

 

RE: My New Maggies - Part 2 - The Unveiling, posted on August 22, 2014 at 11:18:25
drugolf
Audiophile

Posts: 26
Location: Idaho
Joined: July 24, 2014



Photo 4

 

RE: My New Maggies - Part 2 - The Unveiling, posted on August 22, 2014 at 11:19:22
drugolf
Audiophile

Posts: 26
Location: Idaho
Joined: July 24, 2014



Photo ?

 

RE: My New Maggies - Part 2 - The Unveiling, posted on August 22, 2014 at 11:19:59
drugolf
Audiophile

Posts: 26
Location: Idaho
Joined: July 24, 2014



another

 

RE: My New Maggies - Part 2 - The Unveiling, posted on August 22, 2014 at 11:31:03
StephenEC
Audiophile

Posts: 69
Location: Western Montana
Joined: February 21, 2007
 drugolf ,

In the last picture , you see the white looking particles on the tweeter wire, that's corrison , more than likely BOTH speakers will be affected by it. . . sooner or later .

They can be re-wired . . . Magnepan sells kits for it .

I wish YOU the BEST of Luck with your journey with these MGIIs

Stephen

 

RE: My New Maggies - Part 2 - The Unveiling, posted on August 22, 2014 at 15:55:07
Satie
Audiophile

Posts: 5426
Joined: July 6, 2002
 The tweeter wire looks like it is corroded extensively. If it hasn't broken already (check it for continuity) it will soon enough, so you might as well order a replacement wire from magnepan.

 

RE: My New Maggies - Part 2 - The Unveiling, posted on August 22, 2014 at 18:37:06
pictureguy
Audiophile

Posts: 22597
Location: SoCal
Joined: October 19, 2008
 Maggies puts the inductors (wire coils) in wrong due to space constraints.
Best to have them at RIGHT ANGLES to one another to minimize mutual inductance.

For my 0.02$, I'd gut the crossover making EXTENSIVE notes and take lots of photos of EACH panel and transfer the crossovers to an external enclosure.

Later, when you finish going completely Bonkers, you can Advance to the 3rd stage and to to some kind of Line Level crossover / either active OR passive, as you choose.
Too much is never enough

 

RE: My New Maggies - Part 2 - The Unveiling, posted on August 22, 2014 at 19:04:06
neolith
Audiophile

Posts: 4842
Location: Virginia
Joined: February 21, 2002
Contributor
  Since: December 2, 2004
 Orienting the inductors orthogonally is a good idea. Fortunately the inductors on the IIa seem to be far enough apart that mutual interaction should be minimal. Personally, I would not deal with the crossover at this point but agree with Pictureguy in looking down the road at a line-level xo.
To post multiple pictures, put this line in your post for each picture:
"img src= http:\\pictures.mysite.com/picture1" and replace the quotes with "<" and ">". "Picture.mysite.com" is your hosting site. Take a look here for more details on using html codes in your posts.



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

 

RE: My New Maggies - Part 2 - The Unveiling, posted on August 22, 2014 at 19:19:48
pictureguy
Audiophile

Posts: 22597
Location: SoCal
Joined: October 19, 2008
 I was GONNA' say 'orthogonally' but don't even know what it means, let alone how to SPELL it!

Orienting them like THIS:: O -- l will keep them from interacting. And yes, while they DO seem reasonably far apart, the DETAILS will be what eventually bites you in the rear.
Too much is never enough

 

RE: My New Maggies - Part 2 - The Unveiling, posted on August 22, 2014 at 20:19:45
JBen
Audiophile

Posts: 3082
Location: South FL
Joined: May 18, 2008
Contributor
  Since: July 26, 2010
 "Later, when you finish going completely Bonkers, you can Advance to the 3rd stage and to to some kind of Line Level crossover / either active OR passive, as you choose."

Pix, I kind'o like the way you phrased this one. LOL, ain't that the sweet truth!

BTW, have we heard of anyone switching this wire tweeter to a QR version on this model? For all the trouble Drugolf may have to go through with these panels, some kind of tweeter upgrade (from the current wires) could be a game-changer for him. Then the benefits of a line-level xo's would really shine through, I suspect. Hmmm, "bonkers"...yup, it happened to me also.

 

RE: My New Maggies - Part 2 - The Unveiling, posted on August 22, 2014 at 21:01:11
JBen
Audiophile

Posts: 3082
Location: South FL
Joined: May 18, 2008
Contributor
  Since: July 26, 2010
 Drugolf, you may want to send an email to Swamis Cat directly, to alert him of this thread. He has had some recent experience with his Maggies, as you saw in another thread. However, he may not know of this current discussion unless he checks in or someone tells him. I am sure that he'll try to help if he knows of this one.

 

RE: My New Maggies - Part 2 - The Unveiling, posted on August 23, 2014 at 00:22:34
JLindborg
Audiophile

Posts: 1037
Location: Uppsala
Joined: April 26, 2010
 Some of the holes You see on the picture of the treble wires are due to burning off the wires that corroded.
The other holes I am not too sure of as I would need to see closer.

In any case, You can not just glue new wires on that mylar as the glue will creep down the holes and attach the mylar to the magnets.

Be careful there!


The one who succeeded was the one who didn't know it was impossible.

 

RE: My New Maggies - Part 2 - The Unveiling, posted on August 23, 2014 at 09:41:59
pictureguy
Audiophile

Posts: 22597
Location: SoCal
Joined: October 19, 2008
 I don't know if there is a magnet to panel spacing issue which would effect sensitivity AND power handling. Not to mention frequency balance between 'ways'.
I've always advocated that Magnepan use STRONGER magnets, too. Imagine the amplifier choices which would open up with even a mere 3 db increase in sensitivity……I could biamp my panels with a PAIR of Pass Labs XA30.5s That would be special.
Too much is never enough

 

RE: My New Maggies - Part 2 - The Unveiling, posted on August 23, 2014 at 11:16:11
Roger Gustavsson
Audiophile

Posts: 2054
Location: Huskvarna
Joined: February 12, 2010
 There is a different spacing magnets-to-Mylar for the tweeter section. Stronger magnets is difficult in some aspects. Bass need to have high Q resonance, stronger magnets will reduce the Q and gone is the bass. Drivers operating at higher frequencies can use stronger magnets without these issues.

 

RE: My New Maggies - Part 2 - The Unveiling, posted on August 23, 2014 at 13:36:11
JBen
Audiophile

Posts: 3082
Location: South FL
Joined: May 18, 2008
Contributor
  Since: July 26, 2010
 Stronger magnets could have a role in your Maggies later, if you choose to experiment. I am trying to figure out more precisely how they do so well on my Maggies and if it would work in others. The first phase took over a year just to determine if it was safe. Now, at almost 18 months into it, I added even more magnets. Looking good...crossing fingers. Distortion trends seem to be improving again in this round, which is encouraging.

As Roger says, it will affect the bass. Some folks may not like it, others may not mind. Anyway, it is a long stretch from MMGs being improved to assuming it will do the same on larger Maggies. We'll see at the end of this year, if I still have MMGs and not a pile of magents sticking out of a black hole in space :-)).

 

RE: My New Maggies - Part 2 - The Unveiling, posted on August 25, 2014 at 12:07:45
drugolf
Audiophile

Posts: 26
Location: Idaho
Joined: July 24, 2014
 Changing to this other tweeter wire version has me intrigued since i am at this stage. Any other feedback? I am about to call Magnepan.

Also, if they offer any replacement items for the caps etc, should I go for it? or is it more typical to go elsewhere for that stuff?

 

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