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In Reply to: RE: Progress posted by emailtim on July 12, 2017 at 10:46:55
They are in the split configuration with the bass panels to the sides.
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Hi Satie,
In '95 Magnepan refurbished my T-1D's & it was amazingly inexpensive. I would much rather do it that way again, but frt nowadays ruins the repair deal & they don't make 'em anymore.
I almost feel like getting a patent since I couldn't find any info anywhere at all.
Magnepan's video shows a square machine pressing up from underneath so I thought they must know what they're doing.
Being a BSME major/EE minor, I know there is almost always a cheaper, EZ'r & better way 2 do things.
I thought & I thought & I did & I did & each time I felt finished, damn another even EZ'r idea/method came 2 mind.
1st I used Mags way but w/o having that massive machine or the room, I used upside down w/weights. It worked so-so but was never quite taunt enough.
2nd I made a picture frame & laid it ontop of my 1st way. Then I stretched the picture frame on another fixture & Viola!!!
This made me think of when I do plaster work: U can almost never sweep it perfectly in one step. It almost always comes out better doing 2 steps & w/o the sanding YUKKK. Well I thought I was finished & AGAIN, damn I figured an even EZ'r, quicker & a (ONE STEP PROCESS).
Think of a round swimming pool cover, a rectanguler trampoline & a bedspread.
One person can slowly go around & around & get it tight cause it's a circle w/totally even tension, but a rectangular trampoline usually requires 2 people cause tension's not as even.
3rd, 4th or maybe 8th time, think of blowing up a balloon: it expands evenly from a beginning point or edge.
U have 2 pull 3 sides away from the initial fixed side.
I seen somebody on the web looking frustrated as they were looking down at the mylar laying on a table. LITEBULB: bedspread method.
My EZ method requires only ONE 3/4in thick, 6ft x 20in sheet of plywood & no weights at all.
Glue & clamping has been conquered.
This should be enuff 2 get U going w/o all the waste of time I & many others R still going thru.
I can give U the finally EZ details if U can get me info on WHERE I can get voice coil wire &/or the newer aluminum ribbon tape.
I C alum tape in the local stores but I need 2 know which one works correctly & w/time!!
Thanks,
Steve
What I had in mind is to glue dowels to the 4 sides of the mylar sheet cut larger than the frame to give a skirt around the frame+magnet board, and use spring weight scales attached to the dowels and a string (one each and the centers) and dial in the tension and at the other end of each spring scale you attach it to a fixed clamp below on the supports for the table or something like it so you can pull the string and fix it where you need to to get the right reading on the scale that corresponds to the right resonance freq. (something you need to measure).
Nice if you could post pics of the simplest version of your jig.
Steve,
Magnepan sells kits of the wire or foil and glue at a nominal cost if you need those supplies.
For stretching, check out some of the guys who build electrostatics. One way to do it as I recall is to use a dowel fixture and double-sided tape. You could then tune the resonance by ear if you have the original figures (written on the label on the driver). I think those figures are for a new diaphragm, that is, not yet broken in.
However, the mylar usually holds up. If you just have one driver with a bad problem you could remove the driver and ship that to Magenpan to reduce the freight charges.
Someone also did a write up here on a DIY repair of a Tympani 1D tweeter, those are more difficult because they have magnet assemblies on both the front and back.
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