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  1. M

    Altec Mystery Diaphragms

    3M Post Its...why didn't I think of that. I initially used masking tape, but that wasn't as simple as expected it to be. I'll have the give them another pass using stickies. Thanks for the info and the tips, hifitown!
  2. M

    Altec Mystery Diaphragms

    Thanks, Woody! I already own a pair of 902-8Bs which do sound very good on the 32c horns I just bought. I figured that the body was a 902/908 without the dressings, but it's great to get confirmation. The diaphragm is, indeed, stuck in the loading cap. It's the numbers on the diaphragm that...
  3. M

    Altec Mystery Diaphragms

    Hoping one of the Altec experts on here can help me out. I bought a pair of 32c horns from a local guy that came with a pair of somewhat unknown compression drivers. The drivers appear to be the 900 series bodies without back covers, but the diaphragms are a complete mystery to me. The codes...
  4. M

    Yet Another Altec 2-Way

    Yes, Earl. My 806s have the original 20275 diaphragms. I can definitely hear the roll off of the 806, but it does enough good stuff before the roll off for my ears to be happy with most types of music I listen to. I have a few different super tweeters around here that I used to sometimes mate...
  5. M

    Yet Another Altec 2-Way

    Sounds is pretty darn good so far. I finally got around to flipping the cabinets (placed them on some floor dollies), and that definitely helped to further blend the the horn with the 412c. I also picked up a pair of RCF H3709 horns for cheap, and I hate to say it, but I do prefer their sound...
  6. M

    Yet Another Altec 2-Way

    I haven't had a chance to try playing around with flipping the cabinets yet, so this graph comes from the woofer at the bottom of the cab. A quick picture of the test set up is attached.
  7. M

    Yet Another Altec 2-Way

    Just another follow up on this project. After some experimenting with varying resistances in series with the 806a, I've settled on 2 ohms which sounds very well balanced to me. I think I now have a crossover network that I can listen to for a while. I'll post an updated schematic as soon as I...
  8. M

    Yet Another Altec 2-Way

    I sure do, Earl! I made the Lpad move that we've been discussing, and I'm liking the range and ability to adjust the midrange to taste. I think that was a good move for my situation. That said, I'm still tweaking the HF a bit, which seemed a little too hot with the LPad removed as a sort of...
  9. M

    Yet Another Altec 2-Way

    That makes perfect sense. Thanks, Earl! :)
  10. M

    Yet Another Altec 2-Way

    @EarlK - does the exact placement of the 20R resistor in series with the Lpad matter? For example, could I wire terminal 2 of the Lpad to the point where the two 8R resistors connect and then wire the 20R resistor from terminal 1 to ground? Reason I ask is because it would make for a much...
  11. M

    Yet Another Altec 2-Way

    Interesting. Was the basis of this the same series crossover from post #2 in this thread?
  12. M

    Yet Another Altec 2-Way

    Really appreciate the detailed assistance here, Earl! I'll give this new arrangement with the Lpad a shot this weekend and report back.
  13. M

    Yet Another Altec 2-Way

    So, I disconnected one end of the 13R resistor, and the midrange definitely came back, but it came back with a vengeance. Crossover beginners question: can you safely swap components in and out of a crossover while playing music? So, for example, could I A/B test by connecting and...
  14. M

    Yet Another Altec 2-Way

    Right, which I figured would mate well with the HF section of the N-800-F, or am I completely mistaken?
  15. M

    Yet Another Altec 2-Way

    Could I also remove the 13R resistor and move the 16 ohm L-pad over in its place (only using terminal 1 and 2) as discussed here: Altec Attenuation Circuit Help Would this give me the option to adjust the midrange to taste?
  16. M

    Yet Another Altec 2-Way

    @EarlK - these are the original 20275 diaphragms.
  17. M

    Yet Another Altec 2-Way

    I finally got around to throwing together a initial test crossover for this Altec two-way experiment. It's basically a mishmash of Katalyst's LF network to "tame the 412C" and the HF section of the N-800-F network for the 806A. I added the 30923 attenuation network and a 16 ohm L-pad. Sounds...
  18. M

    Omega speakers

    Similarly to djnagle, for a while I ran a pair of Omega Super 3i monitors with a Decware Zen triode clone that I built. I came into the Omegas, with the RS5 drivers, right around the same time that I decided to build the Zen clone. The pairing was really nothing less than sublime--just really...
  19. M

    Yet Another Altec 2-Way

    Thanks for the AK link, Katalyst. A lot of good stuff in there, and I hadn't yet come across that particular thread even after all the Google searches I've performed for "Altec 412C." I don't think flipping the baffle is an option, at least at this point, I'm afraid. Doing so would mean...
  20. M

    Yet Another Altec 2-Way

    What horn is that exactly? Did I miss a post where you discussed "taming the bi-flex"?
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