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  1. [QUOTE=mfaughn;421274] I picked up a pair of...

    [QUOTE=mfaughn;421274]

    I picked up a pair of big ol' cabinets tonight that were loaded with Altec 420A. I'm wondering how they would sound in the C34 cabinets?


    Greetings - The ALTEC 420...
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    [QUOTE=Radarek;421338]Thanks "Where i can find...

    [QUOTE=Radarek;421338]Thanks
    "Where i can find plans for those cabinets.
    Stonehenge v looks great but can't find plans..."

    There is no such thing as a Stonehenge V. It was never an ALTEC...
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    [QUOTE=Kay Pirinha;420768]Hi, for my upcoming...

    [QUOTE=Kay Pirinha;420768]Hi,

    for my upcoming 4430 project I'd need two ports of 104 mm internal diameter and 210 mm length. Tubes of this diameter appear to be unobtainable here in Germany. Next...
  4. What's old is new again. ...

    What's old is new again.

    http://www.forcesofgeek.com/2014/08/the-technological-breakthough-of-1979.html
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    Hi Barry - I stand corrected. I should have...

    Hi Barry -

    I stand corrected. I should have explained myself better. However, I'm not all that familiar with the 2234. I conducted a T-S parameter test about ten years ago with one of my 136A's...
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    Greetings - The mass ring serves to increase...

    Greetings -

    The mass ring serves to increase the total mechanical mass of the cone assembly, thereby lowering the free air resonance ( fs ) of the woofer. By removing the ring you essentially have...
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    Greetings - Do you have a schematic? If not,...

    Greetings -

    Do you have a schematic? If not, some kind soul on this forum might be able to help you out. Or the value may be stamped on the unit itself. There must be scores of resistive...
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    Greetings - The ALTEC Lansing M500 was...

    Greetings -

    The ALTEC Lansing M500 was specifically designed for sound reinforcement, and should not be compared to a Model 19, which was designed specifically as a consumer HiFi speaker. If...
  9. Greetings - The rule of thumb is that a high...

    Greetings -

    The rule of thumb is that a high frequency horn, or horn tweeter, will be crossed over approximately one octave above the horn cut-off frequency. Consider the horn mouth perimeter...
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    Greetings - IMHO, no. The dome has a flange on...

    Greetings -

    IMHO, no. The dome has a flange on it. I have never seen a JBL dome, either paper or aluminum, to have a flange. Also, the ribs lack definition. The cone and dome are a bit faded in...
  11. You can remove the cover if you want, but an...

    You can remove the cover if you want, but an educated guess tells me doing so will not improve the sound. Doing so could do more harm to the sound than good at low frequencies. With respect to ported...
  12. The hole plug is for symmetrically mounting the...

    The hole plug is for symmetrically mounting the tweeters. Otherwise referred to as left and right hand.
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    You should have a pair phenolic insulators for...

    You should have a pair phenolic insulators for the input terminal, so as not to short the positive terminal to the casting.

    HF
  14. Post a photo, if you can.

    Post a photo, if you can.
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    Kinda funny. Electro-Voice was mounting their...

    Kinda funny.

    Electro-Voice was mounting their horns and tweeters vertically decades ago.

    HF
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    Greetings - If you must remove the cover I...

    Greetings -

    If you must remove the cover I recommend not drilling out the pop rivets, as doing so may cause the rivet to spin when the drill bit makes contact with the steel pin, which will tear...
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    Based on the horn mouth dimensions, I think 1.5K...

    Based on the horn mouth dimensions, I think 1.5K would be safe bet. However, the 2414 data sheet suggest a 2.1K crossover frequency. The 2414 published highest frequency response is listed as 20K. It...
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    If you plan on using the APT-200 horn, consider...

    If you plan on using the APT-200 horn, consider this.

    As a rule of thumb, the crossover frequency that should be used is typically one octave above the low frequency cut-off of the horn. Or, the...
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    [QUOTE=CowFish;416729]Hello, "Will it screw...

    [QUOTE=CowFish;416729]Hello,

    "Will it screw into a 2404H baby cheek horn and work well from about 2.5k and up?"

    Greetings -

    The 2414 compression driver has a 1 inch throat exit.

    The...
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    Do you expect someone to give it to you for free?...

    Do you expect someone to give it to you for free? Files like that require an awful lot of work before you can even think about creating a CNC program.
  21. Greetings - Even if the 130A had an aluminum...

    Greetings -

    Even if the 130A had an aluminum dome, or the D130 had a paper dome, they are still two different animals. The only commonality between the two is the cone itself.

    If you review the...
  22. Greetings - FYI. The drawing you provided is...

    Greetings -

    FYI. The drawing you provided is that of a Jensen folded corner horn, of which was published in a magazine around 1952. AFAIK, Jensen never put the design into production. The only...
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    The UREI horn was glued to the throat transition....

    The UREI horn was glued to the throat transition. The transition is held in place with two screws.

    http://www.audioheritage.org/vbulletin/showthread.php?21472-Great-Plains-Audio-Repair-of-Urei-801...
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    Greetings. The horn is attached with screws,...

    Greetings.

    The horn is attached with screws, as with all the 604 horns. Not glued. But the inner surround is glued to it. Puzzling why you would need to realign it. Perhaps it was hit by something...
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    [QUOTE=Propman;414544] "The grill cloth is...

    [QUOTE=Propman;414544]

    "The grill cloth is coming apart and I assume you just unscrew the board and recover like a conventional speaker."

    Greetings -

    A suitable grill fabric to use should...
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