Welcome! Need support, you got it. Or share your ideas and experiences.
As standard the MGIIIA is configured with the magnets facing the listener. In his MGIIIA tweaks AndyR proposes swapping the panels left to right and flipping them so that the panels are turned front to back and the mids are next to the ribbons.
Before going down this path I also noted that the rear of the ribbons also appears less occluded than the front. So does it make more sense to swap speakers front to back and reverse the driver polarities?
Your thoughts and guidance are as always appreciated.
It seemed to me, Mike, that the horizontal bars of the ribbon cage (which Magnepan place at the front, to protect the ribbon) must be negatively affecting the sound.
So it is better to reverse them; it seemed to me, this is not something Magnepan would be likely to do ... as it opens up the ribbons to more easily being damaged.
I have a feeling that this is the main reason why Magnepan put the magnets/screens facing the front on most of their speakers. Pretty easy to poke a hole in the mylar if the open side faces forward, and with the ribbons, those are strong magnets that are going to suck any stray metal object right into the ribbon tweeter if there is nothing to block it going in. On the T-IV the midrange driver faces opposite, with the mylar in the front to squeeze as much efficiency out of it as possible, I suspect.
Sounds like the easy option is to just turn the speakers around and wire + to - and - to +; i.e. turn the speaker around and invert the entire speaker cable connections.
Perhaps one can address any unwanted crispiness by using additional felt around the ribbon.
I have them all apart now so it's easy to do anything so I am just trying to work out the most optimal configuration.
to crispy sounding. Short term test, though.
I would turn the speakers facing backwards, and reverse the polarity of the inputs, first.
Also keep in mind that if you physically reverse the bass panels, you need to invert the polarity of their connections to maintain the correct phase.
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