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In Reply to: RE: Look at MUG For the III and IIIa crossovers and posted by Roger Gustavsson on January 19, 2021 at 01:47:43
I believe the tweeters are the newer version. There looks to be a place to put an external resistor.
I have 17' so enough room to separate the tweeters from the mid base panel. What sort of spacing from the wall to the base panel, tweeter to mid and tweeter to tweeter? Should all the panels be parallel or angled?
I have some speaker wire and interconnects on order which should be here in a few days. It will take me a few days to get the turntable and motor control system assembled. I may have it up and running this weekend.
Longer term I will replace the mid panel with a B&G RD75 and will look at bi-amping. I have a Marchand XM44 active crossover for that and I may try to find a Pass/First Watt B4.
Tymp IVa ribbons are the same as the later MG-IIIa ribbons - ie. 2 ohms
Well, the original ribbon that I have is 3 Ohm without any resistor. Was the T-IVa released before the MG-IIIa? I also have the replacement ribbon, the 2 Ohm, as this is the only spare Magnepan have for these.
The external crossovers are not identical for MG-III/IIIa and the Tympani IVa. The T-IVa is crossed over lower.
"The T-IVa is crossed over lower." All else being equal, is that more or less protective of it's ribbon? I've blown my ribbon's 2.5 ohm fuses (mostly by unintentionally switching to a source set to play too loud) dozens of times. When the original Radio Shack was still in business I bought enough packs of both 2.5 and 3.0 ohm which hopefully would have lasted my lifetime, but I was forced into buying even more from eBay.
Fortunately my IV-A remains the same as the day my Magnepan dealer delivered them ~40 years ago, wired them up and played them. (Something I think he did to protect himself from possibly being accused of providing a damaged product.) I moved everything including those IV-As to my present dwelling 28 years ago.
When you live right 'nothing can possibly go wrong.'
Aah, OK - that is very interesting, Roger ... the ribbons in the T-IVa mid/ribbon panels that I bought 10? years ago were 2 ohm.
Recently replaced (as I blew one) with the current (slightly longer!) 3 ohm ribbons.
The very thin original 3 Ohm ribbons were very fragile. Even though mine survied the Atlantic crossing, one of them ripped later. I bought the replacement kit from Magnepan, the 2 Ohm+resistor+glue+shims etc. (see below) Me too, have an additional par of the recent ribbons.
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