In Reply to: RE: How t measure the impedance of Ribbon tweeters? posted by Roger Gustavsson on March 22, 2015 at 23:51:25:
Are you saying your T-IVa ribbons are 3ohms by themselves, Roger - without the added 1ohm resistor?
You are quite right in saying that the original Magnepan ribbons - which came out on the MG-III - were 3ohms ... then (possibly when they changed to the IIIa?) it became a 2ohm ribbon plus a 1ohm res. Which, as you say, was put in the wrong place in the IIIa XO circuit! :-))
My own T-IVa ribbons measure the same 2ohm that my IIIa ribbons did - so I've been running them with a 1ohm Duelund in series, as my current ribbon amps can't handle a 2ohm load. However, at some stage I will be replacing my ribbon amps with the latest evolution of the circuit - which can take a 2ohm load - so I can then remove the Duelunds. :-))
Regards,
Andy
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Follow Ups
- T-IVa ribbons? ... - andyr 19:09:44 03/23/15 (15)
- RE: T-IVa ribbons? ... - Roger Gustavsson 23:41:30 03/23/15 (0)
- RE: T-IVa ribbons? ... - Davey 20:12:18 03/23/15 (13)
- "That resistor might have been placed there deliberately." ... - andyr 20:35:14 03/23/15 (12)
- RE: "That resistor might have been placed there deliberately." ... - Satie 12:15:19 03/24/15 (3)
- RE: "to be high passed higher up." ... - andyr 12:27:04 03/24/15 (2)
- RE: "to be high passed higher up." ... - Satie 22:06:49 03/25/15 (1)
- RE: "to be high passed higher up." ... - A.Wayne 17:34:14 03/29/15 (0)
- RE: "That resistor might have been placed there deliberately." ... - Davey 20:49:50 03/23/15 (7)
- "Tympani IIIA schematic" ... - andyr 21:46:37 03/23/15 (6)
- RE: "Tympani IIIA schematic" ... - Davey 06:22:51 03/24/15 (5)
- RE: "Tympani IIIA schematic" ... - Roger Gustavsson 11:31:46 03/24/15 (4)
- RE: "Tympani IIIA schematic" ... - Davey 12:49:27 03/24/15 (3)
- RE: "Tympani IIIA schematic" ... - neolith 17:39:01 03/24/15 (2)
- RE: "Tympani IIIA schematic" ...raal ribbon - A.Wayne 17:31:11 03/29/15 (0)
- RE: "Tympani IIIA schematic" ... - Davey 18:49:49 03/24/15 (0)