Welcome! Need support, you got it. Or share your ideas and experiences.
Return to Planar Speaker Asylum
136.61.203.154
In Reply to: RE: Magnepan Tympani IVA......Am I Nuts?!? posted by josh358 on April 11, 2017 at 13:17:12
Yes I have repaired many Magnepans with delam on the wires or broken tweeter wires. Not a hard job at all just takes some time and patience.
But these show no signs of delam on either the bass or mid panels. They as good as the day they left the factory.
Talked with Magnepan today about the tweeter. They play nicely and don't seem to have any sage but there is some twisting in certain areas. Gary said he would need to talk to Wendall on this one he did not know if this was a problem. At $100 a tweeter to repair it is not a big deal either way.
Follow Ups:
I had some subtle delamination on the midrange that I don't think you'd see through the grille cloth, and also some lifted ends on the woofers that I didn't see through the cloth -- which of course doesn't mean that someone else wouldn't have:
Another issue is that the mids seem to have detached from the tape on some of the crosspieces, I stuck the mylar back down and it seems to have stayed. Not really an issue for either of us since we won't be using the mids.
Just checked my ribbons and the RH one looks OK but I noticed what looks like some twisting at the top and bottom of the LH one:
I'll be curious to hear what Wendell says.
Much prefer them in the off-white cloth.
The bass panel wire are pretty easy to see through the cloth. And you can feel them quite easily as well. I think they are fine.
The wire on the mids is much finer and harder to see or feel through the cloth. I will know more when I re-sock them.
My tweeter is doing the same twisting. No bad and confined to the top/bottom of the ribbon. Seems to play fine.
Norman's are beautiful, though, have you seen his installation?
I suppose it depends on your decor, I haven't decided yet what color my new socks will be but given they're size their kind of overbearing in my undersized listening room so I'm leaning towards white:
Maybe I should Photoshop these to get an idea of how they'll look . . .
The delam on the mids is only on I think three of the dividers, for some reason the wires have not only lifted but stretched a bit so they'll have to take a slightly serpentine path when I glue them back down. I'm not concerned though since the diaphragm barely moves at that point anyway. More concerned with the fact that the Mylar may not be sticking to the tape, which could mess up the resonances. I suppose I could make a thin bar and use it to clamp them from the front.
incredibly beautiful, wow..
Isn't it? I think Norman's is the nicest looking Maggie installation I've ever seen.
Edits: 04/15/17
Both sets, incredible-
Mine still need some work, although they look surprisingly good without the socks. I touched up a few spots where the spray didn't reach, but it isn't a perfect paint job, you'd have to take them apart and spray the baffles to do that. I'm still not sure whether I'll end up putting socks on them or not. If I do, I'll probably use velcro, because taking all those staples out is a bear!
Great looking set-ups.
In my decor either color would work I just prefer the off-white. Kind of tired of everything being black. I look at black colored Quads all day long.
Finally found a pair of original Quads in mint condition copper. In KC no less. Got them the week before the Tympani.
Those look really amazing! I've never seen such a nice-looking pair of Quads.
I see black in this kind of condition all the time. I probably have 8 pair in black that look this good.
Copper in this kind of condition is extremely rare. They should shine like a new copper penny. Generally they are all banged up and heavily oxidized.
This pair was built in 1959 has never been touched since they left the factory and everything works. Not like they should any longer there is no real bass any more. The Mylar was gotten stiff over the decades and panel resonance goes sky high killing bottom end. But they do work.
It has been a good couple weeks finding great speakers here in KC.
I've seen black ones in nice shape but I've never seen a copper one that wasn't oxidized. I had no idea they were ever shiny like this, figured they always looked dingy.
Does sound like you've had an amazing two weeks! I've been busy selling old equipment on Ebay after putting it off for too many years, and ordered a Benchmark AHB2. That should be an interesting experiment! There's a 30 day trial, so time to see if it's as good as people say. I was originally going to try a NuPrime ST-10 with the Neo 8's in mind, but they were out of stock, so after a month I cancelled my order and switched gears.
My music teacher's quads started out coppery in 1978 but were looking increasingly drab so were painted eggshell white. So that finish didn't really last long as the speakers were just a bit older than I was and those were my high school years.
Wonder why this one is in such good shape, and if the finish can be restored.
It is funny that of all things it was the finish on the grills that went first on speakers nearing 20 years of service. I really don't understand how this pair survived looking so youthful. Maybe someone lacquered them early on?
Or found a way to polish them?
This is the external crossover. Low pass, 18dB/octave at about 250 Hz. High pass, 12dB/octave at about 400 Hz. I prefer to use an active crossover, at least for the low pass section.
Edits: 04/16/17 04/16/17
I just bought a pair of IV's and I have found also an original Magnepan XO -1 crossover, BUT on the little black box is written: crossover freq. 210 pfd, speaker model T-1D amp. imput impedence 470K. So it seems this one is not good for biamping my IV. Please help, thanks.
The XO-1 is not a true crossover, it is just a volume control for the bass. The bass driver need to keep its coil. The tweeter section can have its capacitor at line level right at the input of its power amplifier.
The XO-1 is intended for passive biamping. Some have installed inside a high pass capacitor matched to the input impedance of the amp driving the mid/tweeter section. The markings on the one you have are indicating that it is intended for an ARC tube amp to drive the tweeter of the T 1D. That means the box was likely back from the day when ARC did the marketing for Magnepan.
Calculating from the values, The crossover was a 500hz so is a fit for the T IV rather than the T-1D If you have a tube amp to power the top end it might match the input impedance if it is around 500K. SS amps are rarely that high and most commonly at 10-50k.
You can modify this XO-1 to either allow passive biamping by shorting out the capacitor inside with a wire, or switching it with a value that matches your power amp for the top drivers. e.g. 6nF or 0.006uF for a 50K input impedance or 30nF or 0.03uF for a 10K input impedance.
When bypassing the internal XO-1 cap you use the separate biamp markings on the passive speaker level box via the diagram on the crossover box if you have the one with two sets of input connections like the MG3.x box. If you have the box with a single set of connectors then you should use the internal capacitor option. .
When using the capacitor (the one appropriate to your amp) you do not connect the top amp via the speaker's crossover box, just the bass amp will go through it.
Many Thanks Satie, I would like to use my IV-A with 2 ADCOM GFA 555.Do you have the manual of the XO-1? It seems impossibile to find. Thanks again.
The 555's 22k ohms input impedance requires 0.0144uF so either a 0.014 or 0.015 uF will do.
Does anyone have a copy of the schematic for the external box?
I have reached out to Magnepan for the schematic and they have been very kind supplying documents. Unfortunately they keep sending everything except the Tympani IVA schematic!
You can find it here, http://www.integracoustics.com/MUG/MUG/tweaks/mikebarney/Tympani-4a_xo.gif
I placed a link to a picture one of my own crossoverboxes in the other thread. Any more information you need? I have a pair of T-IVa that is the procees of modifying.
Email me, I'll send it on.
Thanks for the offer. I see you don't accept email from the Asylum.
OK, should be fixed.
Really? Sorry about that, that was supposed to be turned on. I'll go change it. (Not sure if it's intentional but your profile said doesn't accept mail too, which is why I didn't just send it to you.)
Weird. I thought mine was set to on.
Looks like we're both in the same boat -- a glitch in the Asylum software? Because people have never had trouble emailing me in the past and I know I didn't turn it off.
Yes must be some sort of glitch. Just changed mine.
I usually get quite a bit of email from the Asylum. Had not seen any lately now I know why!
Kentaja---You could paint the side rails black, they would then almost disappear.
Hey, will the T-IVa side rails fit on the T-IV panels? I rather like the look of the side rails, which my T-IV's of course don't have. Wanna sell 'em?!
The IVa side rails will fit the IV. The panels themselves are same size.
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: