...or give them a minimal baffle step and invert the HF phase, ala 9446.Originally Posted by Zilch
... Time alignment. Gotta run active and delay the woofer, unless it's a bass horn with the woofer back there somewhere, too.
...or give them a minimal baffle step and invert the HF phase, ala 9446.... Time alignment. Gotta run active and delay the woofer, unless it's a bass horn with the woofer back there somewhere, too.
Every time I run it in BB6P, the M19 box comes out too big for that woofer. Closing off the passage between the top and bottom sections seems an appropriate fix, if retuned. I should have bought the pair in Sacramento last week for experimentation....
See, I told ya so!
Zilch, your 806/811/511 measurements certainly correlate with my crude measurements from years ago.
Before I ditched all my Altec stuff, I too, finally ended up using 1.2 KHz with 811's and 800 Hz with 511's.
Thanks for taking the time and sharing this, it has been interesting.
Like Rob, I'm scratchin' my head saying, "What's UP with this?"
If it weren't for the fact that others have reported similar measurement results, I'd be suspecting that the ones I've measured just need refurb and new diaphragms. But the Radian diaphragms also behave badly in 804A motors, plus other problems. I'm going to move those into 802s and see if the response is any different.
And I'd say I'm just doing something stupid here with the measuring if I weren't also able to put BMS or LE85 on 811B or 511A without changing anything else and obtain much improved response plots.... :dont-know
Yup, I always thought the 806 was a P.O.S. The 802 was reputed to be better, but I have no experience with them. This never made sense to me though, since I am sure they both shared the same diaphragm, the 802 just had a bigger motor and about 3 dB more sensitivity.
Zilch,Every time I run it in BB6P, the M19 box comes out too big for that woofer. Closing off the passage between the top and bottom sections seems an appropriate fix, if retuned. I should have bought the pair in Sacramento last week for experimentation....
The mint M19's are still ava. Not like you couldn't get your money back out of them. I bet someone over seas would love to have them if that shipping option was offered????
http://cgi.ebay.com/ws/eBayISAPI.dll...6565&rd=1&rd=1
NO AFIL:
J/S-S1A
Jeff-S1A
1) Jack's and Scott's crossovers perform identically, except the L-Pads are wired opposite.
2) They have variable compensation, ~10dB's worth at MIN attenuation.
[Altec knew what was up with their compression drivers, looks like....]
Edit:
N-800-F adjustability with JBL LE85, second,
With Altec 806A, third,
BMS 4550, fourth,
BMS 4550 plus low-Q compensation, last. Also knocked down the UHF peak ~3 dB.
[LE85 plays like L200B at 0 and 2 attenuation....]
http://audioheritage.org/vbulletin/s...&postcount=138
Pretty good testament for ELPAC cap packs!
Well, ain't THAT an unanticipated kick in the patootie....
No wonder the schematic's "Not available...."
Here's Jack's reverse-engineered derivation again; L-Pad's a symmetrical 20 Ohms from his measurements, tho, rather than a conventional asymmetric 16 Ohms....
Not if you bow to the right gods!Well, ain't THAT an unanticipated kick in the patootie....
(In all fairness, those LE-85s don't look too shabby, though...)
Earry similarities? (-5pts. spelling.)
Scotty.
One step above: "Two Tin Cans and a String!"
Longtime Alaskan Low-Fi Guy - E=MC˛ ±3db
Lisa and I have been watching and reading everyday.
She asks me when I get home from work,"what page are they on, today?"
This has been an incredible journey through another applied physics class!
Scotty.
One step above: "Two Tin Cans and a String!"
Longtime Alaskan Low-Fi Guy - E=MC˛ ±3db
Sooner or later you're gonna hafta drive 'em with both 8 and 16, ya know....
And at some point, the time invested could have bought you a pair of Vals of yer own...
(That one required some proportional scaling)
Naw, I maybe get me some M19s, tho....
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