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In Reply to: RE: Length of the newer (3 ohm) ribbon cage posted by andyr on August 30, 2020 at 22:22:47
As I have both, the ribbon cages are the same. Both measures 60" (1524 mm). The magnets are thicker and the ribbon itself is narrower in the newer ones. The attachment of the ribbon element is different, not sure how. I will have to check.
I have three pairs of ribbon tweeters. The very first one with the extremely thin ribbon (3 Ohm), one of them broken but I have the 2 Ohm replacement. Then two pairs of the newer narrower ones.
I'm delighted to hear they are the same length - I had read the newer ones were 1/2" longer (although I could never understand why Magnepan would've bothered to change the physical dimensions of the ribbon cage!).
Now, you say " The attachment of the ribbon element is different, not sure how. I will have to check. ". I presume you mean the way the ribbon is suspended between the magnets?
If so - that is not a concern to me - however, it will be annoying if the flange screw holes are not located in the same places.
The ribbon is suspended in the same way between the magnets but I think the termination at the ends is different and need a bit more space. I have measured the Cages and they are the same for T-IVa and MG 3.6. These are of two different generations of the Magnepan ribbon tweeter. The third pair is also of the second generations (still in use today) but it is still in its container.
Magnepan Ribbon Tweeter
Above and below the cage, there need to be some space for the connections. Here is a picture showing the MG 3.6 upper connection.
Here a spare set I have.
Here the ones of the T-IVa (hardly visible in my storage baffle).
Magnepan and others use to say the new ones are taller/longer. Both cages measures 60"/1524 mm. The ribbon itself is slightly shorter in the wide version.
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