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In Reply to: RE: "That resistor might have been placed there deliberately." ... posted by Davey on March 23, 2015 at 20:49:50
Thanks, Davey but when I said "III" & "IIIa" I was meaning the original 3-series - the MG-III & the MG-IIIa. I know what ribbons these models had - and I now have a T-IVa ribbon in my 'Frankenpans'.
As dar as I am aware, the Tympani III did not have a true-ribbon.
Regards,
Andy
Follow Ups:
Well, my goodness, we're going to have be more specific on the models we're talking about here. Roger was talking about the Tympani IIIA's, with his resistor comment, was he not?
Yes, I'm aware they don't have a ribbon tweeter and the "normal" IIIA's do. :)For reference, above is the difference between the two possible positions of the 1 ohm resistor (with the two ohm driver) in the Tympani IIIA tweeter network.
Dave.
Edits: 03/24/15 03/24/15
No, I was talking about the Tympani IVa.
(I have the Tympani IIIA too but I did not mention them here.)
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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