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    Repairs or replacement drivers for your speakers...

    Repairs or replacement drivers for your speakers are best directed to GPA
    Calling on the phone is by far the best way to contact them.
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    Apologize for resurrecting an old thread, but I...

    Apologize for resurrecting an old thread, but I just came across this and wondered if you have done anything further with this rare piece of audio history!
    How did you power up the field coils? Are...
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    Do you have any part numbers from either woofer?...

    Do you have any part numbers from either woofer?
    The picture from the 1975 catalog is hard to tell, but doesn't look like either of the woofers you show.
    There is an excerpt from a 1975 service...
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    That does not appear to be an Altec Model 18...

    That does not appear to be an Altec Model 18. It also does not look like a 620 enclosure.
    I'm not an expert in cabinetry, especially for the 604 drivers, but I don't recall ever seeing an Altec...
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    This might be helpful to you: Model 19 Ground...

    This might be helpful to you:
    Model 19 Ground Bypass
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    They look heavy. LP will certainly limit the...

    They look heavy. LP will certainly limit the bidding. But I bet those things sound glorious.
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    There have been many production configurations of...

    There have been many production configurations of the "A7" over the years, but you have the components of an A7 system.
    The components you have are suitable for a crossover of 800 to 1200+ Hz. The...
  8. Given that you are not actually using the Altec...

    Given that you are not actually using the Altec Model 19, it is questionable to assume that a M19 crossover will achieve the result you want. As mentioned, the M19 passive crossover employs shelving...
  9. Geeky but useful

    There are numerous articles available that provide some theoretical background on horn design. This one in particular strikes a good balance of science and application, in discussion of a reverse...
  10. Buying the GPA N1200 crossover is a smart move....

    Buying the GPA N1200 crossover is a smart move. They will sound better than the 40-yr old stock crossover, that's for sure.
    I agree with rvito, you should keep the original stock crossovers so if...
  11. Those 515Bs are 16 ohm LF drivers. The green HF...

    Those 515Bs are 16 ohm LF drivers. The green HF compression driver looks like an 802D and are also 16 ohm (with stock phrams).
    The 808-8A compression drivers are 8 ohm (again if equipped with stock...
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    Look on the frame for a 6-digit EIA number that...

    Look on the frame for a 6-digit EIA number that begins with 391.
    The format of the EIA number is 391YWW.
    Where Y is the last digit of the year they were produced, and WW is the week (01-52)....
  13. Yep. What he said. To illustrate, here's the...

    Yep. What he said.

    To illustrate, here's the impedance plot and T/s params of an Altec small-format driver (802-8G) on the Altec 511B horn:

    http://imageshack.us/a/img402/2396/ru14.png
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    +1 QFT. The wrong crossover can make good...

    +1

    QFT.
    The wrong crossover can make good speakers sound bad. The converse, however, not so much. :)
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    compression driver filter question

    Calling all filter experts.
    I'm working on a crossover design for a 2-way using an Altec 802-16G HF compression driver mounted on 511B horn paired with a 816 bass horn. I need a passive filter that...
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    Hmmm, the Altec compression driver shows...

    Hmmm, the Altec compression driver shows considerable linearity across a wide frequency range. Were these measurements taken with the drivers mounted on a horn?
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    Yes, you should read Nick's thread - it's great,...

    Yes, you should read Nick's thread - it's great, and shows a modern approach to rebuilding 828's.
    And yes, there is ton's of info out here about this.
    By the way Nick, decided what your next...
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    +1 The real trick (as mentioned) is locating...

    +1
    The real trick (as mentioned) is locating someone nearby who has the space and passion for that kind of gear. Depending on the kind of cabinets you have, and the condition of the drivers and...
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    Looking at the 1974 enclosure guide...

    Looking at the 1974 enclosure guide, it recommends a 7.5CF BR cabinet for the 416-8B.
    Another valuable reference is Application Note #5, it mentions 416-8C but you can see specifics for this driver...
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    Hah! No problem Steve. It's all good info being...

    Hah! No problem Steve. It's all good info being exchanged.
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    Yeah, I got hold of the seller out there in...

    Yeah, I got hold of the seller out there in California a while back. They're local pickup only/cash only. He didn't want to talk about shipping at all. :(
  22. Were you planning to crossover at 500 or 800?

    Were you planning to crossover at 500 or 800?
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    Holy Hijack Batman! :) I'm still looking for a...

    Holy Hijack Batman! :)

    I'm still looking for a pair of 2344. Does anyone happen to know how the 2425 compares to the B&C DE250?
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    Looking forward to seeing this project...

    Looking forward to seeing this project progression, Nick.
    Martin's DIY 828 is a cool project - you should have a look at that; essentially blocking up that giant port and put some ducts in there....
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    Fantastic work, Martin. :applaud: The...

    Fantastic work, Martin. :applaud:
    The construction pics give a much better appreciation for the hard work you've put in. I'm sure these sound great - the graphs look good. Are you using gated...
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