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In Reply to: RE: "Tympani IIIA schematic" ... posted by Davey on March 24, 2015 at 06:22:51
No, I was talking about the Tympani IVa.
(I have the Tympani IIIA too but I did not mention them here.)
Follow Ups:
It sure was nice of the OP to come back and elaborate on his query. For all we know he's working on some other non-Maggie ribbon tweeter.
In fact, that looks to be exactly the case. :)
http://www.audioasylum.com/cgi/m.pl?forum=hug&n=172687
Dave.
I guess I was responsible for this thread about Magnepan ribbons, just an "ass"umption on my part. I was tempted to ask which model he was asking about - thinking about the MG 2.5 or 2.6 with a 1.45 ohm impedance - but never did. It didn't even occur to me that he was asking about a non-Magnepan tweeter.
The Raal ribbon uses a transformer to get the load impedance to ~8 ohms (above 1 Khz) which is why the OP could not measure the impedance of the ribbon, only the DCR of the primary. From the data I found the impedance below 100 Hz is ~1 ohm which is probably the actual DCR of the ribbon element and unlike the Maggie ribbons it is not a pure resistive load.
I would be willing to wager a guess that the actual ribbon diaphragm -ZMin is .3 ohm and not 1 ohm ...
Regards
Not your fault. A little Googling by the OP and he could have easily answered his own question. As you did, I easily found the impedance plots of the RAAL tweeters on their website.
My goodness. :)
Dave.
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