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I didn't mean to send you on a schematic search with my last request. John H. sent me an old schematic, which I have simplified.I have 10 TD-1's total, and 8 are from a Cleveland install. 8 are serial number 13xx and match the old schematic.
My "different" other TWO TD-1's, purchased from Buffalo, NY, last year have 1525 and 1530 serial numbers.
I have hand drawn a schematic representing the two units with the 15xx serial numbers and notated in RED, the old values (13xx) are in parentheses.
Also the polarites of the MF and HF sections were reversed in the older 13xx units.
Which of the two is best and why?
I'm willing to upgrade the 8 units to the newer version if deemed necessary.
You input, please. Thanks in advance.
Edits: 02/24/15 02/24/15Follow Ups:
The 15xx and 13xx units have identical drivers including a DE-25-16. Only the Xovers differ and the polarity of the mid and tweet vs. the woofer which is normal.
How should I measure them and how do I get the data to you? Email at DSL, here, carrier pigeon? What? Lol
Hi Claude
I am moving at the moment so everything is in a jumble, I had searched my available hard drives for a revised schematic but I couldn’t find one.
I had designed those at another company, about 15 years ago, so it’s been a while. The 13 series was certainly when I was at the company, I remember the installation was Blossom park and at the demo, the conductor pointed to them and said “those”.
The 15 series may be after I left the company. The only problem with those is that the b&c de25 was discontinued and the de250 is not a drop in replacement. I do have the raw measurements for that cabinet using a bms4550 and I remember that worked well, but would require a new crossover.
If you and John wanted to replace the hf drivers then a more current crossover could be worked out. What i don’t have are the raw measurements for that cabinet with the de25. Do you have a way to measure and show the phase?
A pair of dts-10’s out to be able to make the UN-initiated jump out of their seats in fear haha.
Have fun
Tom
Tom,Just heard from the guy I got the 2 two later ones from. They were purchased in Sept. 2004. Even though it was the tail end of your time there, these must be the improved Xovers (for the B&C DE-25 TD-1's I have) you told me about in my original post last year, right?
Edits: 02/24/15 02/24/15
Tomservos original quote to my post on Aug. 7, 2014:"Hi
I am glad you are enjoying those speakers, they are the second full range Unity speakers I designed back at Sound Physics Labs, around the year 2000 or so. They are similar to the sh46 but not the same as the Synergy horns have even less phase shift.
I have an improved crossover circuit somewhere if you feel inspired to change them at some point but no rush, they worked pretty well as is.One of the early installations of those were at Blossom park in Cleveland, the orchestra conductor auditioned the various choices and pointed to those and said “those, no substitutions”.
Best,
Tom"
So, is the schematic I drew up from my serial #1530 TD-1 the "improved circuit you spoke of in the quote?"I will try and get some phase measurements from both boxes to compare.
BTW, my other 8 ARE from Blossom Park! FYI
Yes my twin DTS-10's are scary to most people.
Edits: 02/25/15
With twin DTS-10's I plan to have one heck of a home theater with this stuff!
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