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In Reply to: RE: My MG-20 manual lists the midrange-ribbon crossover as 3 KHz. posted by Al Sekela on October 22, 2009 at 15:00:20
Hi Al,
Remember, the "crossover point" (between the mid lowpass slope and the ribbon highpass slope) is not the same as the -3dB frequency of the ribbon's HP filter. Typically, the crossover point will be around the -6dB frequencies on the two curves.
Yes, those values are what I used for the simulation - except I made one error (which I will correct/edit tonight, when I can run the simulation again). Because of the release date of the 20, I had assumed it must have the 3.5's 2ohm ribbon - not a 3ohm ribbon. (I didn't see the 3.1ohm value in Jian's schematic.)
That would certainly bring down the -3db point but can you please have a look at the back of your ribbon and tell me approximately how wide the corrugated aluminium strip is? My IIIa ribbons (and the 3.3 & 3.5) are about 1/4" wide ... whereas the 3.6 ribbon - which is 3ohms - is only about 1/8" wide.
Regards,
Andy
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