I thought some of the members might enjoy this review of my Magnapan MGIIIa rebuild. Here is a short accounting of the rebuild:

1. Replaced MDF Frames with Maple Hardwood
2. Replaced all wiring and rewired for Active Tri Amping
3. Replaced the Connectors with Gold Plated 5 way binding Posts
4. Replaced stock stand with custom built stand w/bracing and isolation spikes (not shown in the pic's)

I am using the following to power the MGIIIa's:
Crossovers - Behringer DCX2496, CX2310 for Sub out
Preamp - Acurus RL11
Power amps - Acurus A200 (2) Acurus A200 X3
The Acurus A200's power the Bass Panels and the Ribbon Tweeter
The Acurus A200X3 Powers the Midrange Panels and the third channel powers the NHT W2 Subs (2)

Set up temporarily in a smaller room the improvements over the stock MGIIIa's bi-amped is:
Better defined sound stage with more depth, less congestion in the upper mid/lower ribbon response, more and better defined bass especially in the mid to upper Hz region w/more body. Absolutely better control on complex Classical passages, and driving Rock passages. I am running the subs from 42Hz down.
I should have the sound room in the basement finished in a few weeks, and can't wait to get them moved down and setup in a better environment. It took about a total of 30 hours to complete the rebuild, and I must say was well worth it.
Regards,
Jim

Attached Images

DSCN0022.jpg (44.9 KB, 29 views)

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It's all about the Music, but I sure like way my gear makes it come alive!
My Rigs are here:
http://www.audioaficionado.org/membe...ve-albums.html

I have a pair of MGIIIa's myself and they still sound great. I would like more detail and any pictures you took during the rebuild. It would be nice to know more about the frame you made and what your are doing about a cross over ? I am still using the original crossover.

I have a pair of MG12s that I had moddified with better framing at Magnestand. I guess he is now doing MGIIIs as of last year (link below).


Magnestand - Where Maggies Live And Breathe

Attached Images

magestand12_2.jpg (46.9 KB, 17 views)

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Den: McIntosh C2200, MC202, MVP851 Michell GyroDec MKII Linn Itok LVII Grado Reference Sonata Magnepan MG12QR (mods by Magnestand) Cardas GR Apple Mac Mini, Airport Express, WW Supernova 6 Mini Toslink PS Audio DLlll Digital Link DAC, Premier Power Plant Billy Bags PRO1.5-5 Rack
AV2.1: Panasonic TC-P50V10 Denon PMA-A100 Peachtree iDac Apple iPod Classic Dish VIP722k DVR Marantz BD8002 DVD Magnepan MG1 (IMP) Martin Logan Depth SW

Actually,
I have been conversing with PG and got much of the info and guidance from him. Since a big part of his build is in the crossover, I used his knowledge on the frames only as mine have no crossover in them at this point due to being actively triamped.
I bet your PG'd MG12 sound great!
Regards,
Jim

__________________
It's all about the Music, but I sure like way my gear makes it come alive!
My Rigs are here:
http://www.audioaficionado.org/membe...ve-albums.html