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Bi-wiring. I had moved the crossovers to the outside when I put in fancy caps before. The Auricap guy said his caps worked better without bypass caps, and I think he was right, so they're gone.Today I modded the crossover for biwiring and soldered anti-cables on. (The ugly white thing is a bracket for hanging them from the ceiling upside-down.) Tomorrow I'll haul up my 100-lb vice to crimp on the spades, test this one and start on the second.
Here's the original xover:
Here is my mod:
Here is the trace layout:
If anyone wants to check my work before I blow up an amp, that would be nice.
WW
"A man need merely light the filaments of his receiving set and the world's greatest artists will perform for him." Alfred N. Goldsmith, RCA, 1922
Edits: 01/17/15Follow Ups:
Sounding great. Shoulda done this years ago. Here's a pic of the foil side. There are two cuts - the L-shaped one in the upper left, and the short one in the lower right.
WW
"A man need merely light the filaments of his receiving set and the world's greatest artists will perform for him." Alfred N. Goldsmith, RCA, 1922
There is a reason that enclosure has such a triangle shape in it is too keep the phase tracking solid when listening to them on stands. The tweeter setback and off axis (veritically) required this orientation of the front baffle.By putting them upside down, it may appear that they are "pointing at you", but the midrange suck out and tweeter over emphasis really defeats all the work done on that very unique mixed xover topology and its positive resulting phase tracking in the 200 to 8000 hz range.
Another thing, the 0.22 uf were not specifically for by pass, but you will find that value changes by matched (A and B) pairs. They were used to tune each speaker to meet the "standard". Mostly based upon the measured unfiltered raw performance of each set of the Audax HF17 driver used.
Edits: 01/20/15
They work fine if you set them up so the rear panel is perpendicular to a line pointing to your head. Just because they are inverted does not mean I angled them wrong. I have them set for listening about 12-14 feet away, where the office opens up into the living room via full-width French doors. Surprisingly, sitting at the desk, almost directly below them, the balance is much better than I expected.
Yes, they would be lots better if away from walls and ceiling, but apartment life is often a compromise. With them so close to the walls and ceiling, they get just a little bit of a honky quality, and they don't throw a detailed image, as there is a chandelier in the way. When I leave city life in a few years I'll be able to set them up right (or more likely, replace them with Vandy Quatros.)
Cheers,
WW
"A man need merely light the filaments of his receiving set and the world's greatest artists will perform for him." Alfred N. Goldsmith, RCA, 1922
Is Spica still arounds, guys?
No - long gone. John Bau is still around, still in Santa Fe, and enjoying, among other things, what he sees at night through his telescope. He is out of the hifi business, and has a business "Precision Services," selling refurbished test gear.
WW
"A man need merely light the filaments of his receiving set and the world's greatest artists will perform for him." Alfred N. Goldsmith, RCA, 1922
I find this very interesting as I kept my Spica Angelus cabinets with just such a project in mind. New drivers and first order crossovers would be used while keeping the cabinets. I wish you the best of luck with this project. Did you replace the stock drivers?
I always thought the Angelus could use more robust drivers. Mine seemed somewhat distressed when pushed. Very unique and interesting design that did a decent disappearing act in the listening room. My electrostatic loving friend once said it was the only box ( if you want to call it that) speaker he could live with. Good luck on your project.
Thanks! I agree with you about the drivers and believe there exist much better drivers today than came with the original speaker. Also I think I can do much better (with the help of a speaker designer friend) on the crossover. The cabinet also will need some internal bracing. I have to do something soon as my wife keeps asking me why I kept those hideous speaker cabinets.
As I've said, good luck on what will be a challenging project. Glad you have a friend in tow for the x-over redesign. For what it's worth, I really like the Hiquephon tweeters in my SongTowers. That said, a plethora of drivers out there that might work quite well and still retain the disappearing act the Angelus was known for.
No driver replacement, though I put in new tweeter voice coil/domes a few years back. You can still get those, I think, from Madisound. There is no known replacement or equivalent for the woofer, but as you can get a pair of TC-50s for a couple hundred bucks on a good day, *that* is how one gets replacement woofers.
WW
"A man need merely light the filaments of his receiving set and the world's greatest artists will perform for him." Alfred N. Goldsmith, RCA, 1922
WW-
I knew that I had not read anything about Spica lately? What happened to this speaker comapny? I remember it being very popular during the 1990's...
John sold the company to Parasound and they ended the line. Why did they buy it only to end it? I don't know.
WW
"A man need merely light the filaments of his receiving set and the world's greatest artists will perform for him." Alfred N. Goldsmith, RCA, 1922
Bought Spica but retained John Bau as designer. They came out with the TC -60 < a great successor to the TC -50 except that it needed more power (100watts recommended).Parasound management could not decide on the next offerings however. They had john hopping from project to project never really having the time to fully develop anything really new or another model to expand the line up (larger speaker, subwoofer, etc).
Eventually that killed the sales, though the TC-60 was an excellent speaker. The Alon 6 inch sub developed for their Napoleons made a superb matching woofer, BTW.
OH Yeah the TC-50s died because Polydax discontinued the paper woofer used and altered the tweeter. The TC -50 had no drivers at tht point.
Edits: 01/18/15
Thanks for that - it all sounds right, though my porous memory had let it all leak out.
WW
"A man need merely light the filaments of his receiving set and the world's greatest artists will perform for him." Alfred N. Goldsmith, RCA, 1922
Great and interesting story-Stu.
Strange and interesting indeed...
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