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Need help repairing MGIIA tweeter
Need help repairing MGIIA tweeter
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Old 3rd February 2020, 05:35 PM   #1
BaffleChallenged is offline BaffleChallenged  Canada
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Join Date: May 2014
Location: Longueuil,QC,Canada
Default Need help repairing MGIIA tweeter

I was given a pair of Magnepan MGIIA with defective tweeter.
I disassembled one unit, to me, it looks like a AWG32 aluminum wire.
I figured replacing it with AWG34 copper wire would give the same dc resistance.
Unfortunately, it does not work as expected, I have no output pass 5khz.


Any suggestion welcome!
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Old 3rd February 2020, 07:44 PM   #2
tyu is offline tyu  United States
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Join Date: Jul 2009
Call Magnepan...the tweeter wire was $7.50 for a roll that would do two speakers.
copper mag wire don't have same output...as you see..good luck
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Old 3rd February 2020, 07:56 PM   #3
Freecrowder is offline Freecrowder  United States
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Need help repairing MGIIA tweeter
I completely agree with tyu on this. I have repaired a couple of sets of MGIIC with the repair kit sold by Magnepan. Make sure you clean the old adhesive off very well before replacing with new wire. The biggest issue is trying to solder to the aluminum wire with the silver solder. If you buy their kit it will come with everything needed.
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Old 3rd February 2020, 09:40 PM   #4
mattstat is offline mattstat
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Join Date: Oct 2009
And if you're looking for a reason, the likely source of the trouble is the weight involved. Aluminum is 61% the conductivity of copper, but only 30% the weight.

While your 2 steps in wire gauge fixed the resistivity end of the problem, it did not match the weight. Increased moving mass produces rolled off high frequencies.
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Old 3rd February 2020, 11:03 PM   #5
tyu is offline tyu  United States
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I have been doing these re-wires bass&tweeter wire for years...pass on doing the bass wire it never sounds the same..get a used pr or try the alum ribbon tape...it not as loud as the wire....I get maggys for $10 a pr off CL...the tweeter yes yes eze........Not the kit...I get one roll more than a nuf for two tweeters...an some alum solder,an little fulx from magnepan….tweeters is the only palace the3M 377 works...good on the tweeter wire..i never get or pay for the kit my way was $15 + shipping..I buy 77 spray glue from Walmart...an I don't put any thing ontop of the tweeter wire....well (lite coat) of spray pant....$1.buk can.... it the drires in the spray pant that pulls an set the wire down....works great....25 years...
Good luck have fun....maggys are great sound …..for vary little output cash
Best sounding older type Are the MG1c...just little biger than the great SMGa
Well to me...I got the MG2.5r,MG2c,MG1c,MMGs,SMGa...the 1c just sound right
As with all panels tube amp should be used as thay were made for...will the older one that wire faces back...
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Old 3rd February 2020, 11:19 PM   #6
BaffleChallenged is offline BaffleChallenged  Canada
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Join Date: May 2014
Location: Longueuil,QC,Canada
Thank you all for the replies, what a great community!
I will try the one that is done without fully reassembling the frame before i commit the time to redo it with aluminum wire.
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Old 4th February 2020, 11:00 AM   #7
RogerGustavsson is offline RogerGustavsson  Sweden
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Join Date: Aug 2004
Location: Huskvarna
The copper vs. aluminium wire will result in about double the mass for the copper for a given resistance, that will limit the higher frequencies. The aluminium wire used by Magnepan is coated. It can be soldered but you will need a special solder (expensive). Better to use the connectors used by Magnepan.
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