ADC 303a loudspeakers

Discussion in 'Speakers' started by d-ray657, May 23, 2008.

  1. d-ray657

    d-ray657 Ain't this boogie a mess Subscriber

    Messages:
    3,023
    Location:
    Overland Park, Kansas
    This week, I picked up a pair of ADC 303a loudspeakers. I like the sound, but I might want to tweak the tweeters. My question is: does anyone know how to get the grilles off of them? They certainly won't come off with bare fingers. They are more than just a frame - feels like they are fibreboard with cutouts for the drivers. The fabric-covered board seems to be attached to another board that is indented into the cabinet by about 3/4". Fumble-fingers here tried a small pry bar and succeeded in cracking the corner of the grille.

    These have good sturdy cabinets and feel and sound like there are substantial drivers inside. I don't know if they are going to need foam, but I do know that I will be refinishing the cabinets. I would appreciate any information on this model, particularly information on how to remove the grilles. Thanks.

    Regards,

    D-Ray
     

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  2. archie2

    archie2 Addicted Member

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    Dunno about the 303a but I had a pair of 303ax and the grills were just "tarred" on.
     
  3. glxie63

    glxie63 One too many

    Messages:
    82
    Location:
    Alexandria, VA
    Yeah, I have the 303AX and the grills came off easily. They seemed kind of glued on. When I got mine the midrange and treble controls did nothing. I just finished recapping last night and now they work. :banana:

    Yours probably won't need a refoam. Mine don't have foam, they used that butyl stuff.

    good luck

    george
     
  4. kenhappen2u

    kenhappen2u Ken/N9QPE naperville il

    same here , i have a pair of 303 ax and they were also glued on/ black tar . i used a butter knife and on both sides with some even pressure to pry them off ..... once you get them off glue some small velcro strips on the cabs and the back of the grills so you dont have to go through that mess again . ...just a thought

    Ken
     
  5. Blast

    Blast I Wanna Rock Subscriber

    Messages:
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    Location:
    Kansas City area
    I "just" picked up a pair of 303A myself at an estate sale for $20. Did you ever figure out how to get the grills off? Mine don't want to budge. Looks like I'm going to have to open one of them as I measure under 1 ohm on the speaker terminals. The other cabinet measures 6.2 ohms and works.

    Saw a forum (I think in AK) where a guy left the grills alone and cut into the backs of the cabinets. I think he said the drivers were mounted from the inside anyway. I also see a guy selling magazine reviews for $6. Apparently these were reviewed in March 1965.
     
  6. Blast

    Blast I Wanna Rock Subscriber

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  7. MrRogers385

    MrRogers385 New Member

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    Location:
    Maryland
  8. MrRogers385

    MrRogers385 New Member

    Messages:
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    Location:
    Maryland
  9. MrRogers385

    MrRogers385 New Member

    Messages:
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    Location:
    Maryland
  10. MrRogers385

    MrRogers385 New Member

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    Location:
    Maryland
    The grills pry right off with a flat head screwdriver or small pry tool(preferred). They were nailed unto mine. You pry where the grill is secured(it shouldn't flex much) four corners and in the middle is a nail. There is an extra nail in the bottom left corner of mine. Speakers come out of the front. Thanks God I didn't hack up my box from the back. Perhaps on the ax model you must hack the box. (The Brentwood model too it seems you must cut the box) mine has no crossover adjustments. Plain Jane 303As
     
    Last edited: Mar 20, 2017
  11. darkblue94

    darkblue94 It wasn't me. Subscriber

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    Gosh, I sure hope the poor guy didn't wait the whole seven years to find out how to open them up. :confused:
     
  12. MrRogers385

    MrRogers385 New Member

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    Location:
    Maryland
    haha, I sure hope not.
     
  13. Blast

    Blast I Wanna Rock Subscriber

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    Nice! I had to "hack my box from the back". There's a thread on that somewhere.

    Fortunately, the woofers were screwed in from the rear. 50/50 worked well for me that time. My woofers look different than your woofers, as well.

    The tweeters are mounted from the front (like yours). I have no idea what the front of my tweeters look like as my grills are still in place.
     
  14. MrRogers385

    MrRogers385 New Member

    Messages:
    31
    Location:
    Maryland
    Ahh ok, sorry about the design then. One of mine was making no sound at the tweeter so after pulling the tweeter and testing it, turns out it works fine. There seems to be a break in my 5uf capacitor dohicky.
     
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  15. MrRogers385

    MrRogers385 New Member

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    31
    Location:
    Maryland
    So I seen you finished with yours. Did you ever start on some mc1000s? I was looking at some nice ones on ebay.
     
  16. Blast

    Blast I Wanna Rock Subscriber

    Messages:
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    Location:
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    Even though my 303a ARE "finished" now that I've seen you've been successful at removing the grills I may do a complete rework of mine: larger woofers, better tweeters and crossovers, refinish the cabinets. But, it all hinges on being able to reattach those original grills.

    Actually, at this point, I've reworked TWO pairs of MC-1000's in the 'Indignia way":
    http://www.audiokarma.org/forums/in...rs-a-k-a-indignia.160535/page-85#post-5213629

    http://www.audiokarma.org/forums/in...rs-a-k-a-indignia.160535/page-97#post-8313489
     
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  17. MarZutra

    MarZutra Super Member

    Messages:
    4,614
    Location:
    New Scotland, Canada
    Interesting 2ways there. Never knew about the ADC speakers.
    Saw your James Garner avatar... I remember getting his autograph many years ago. I used to collect Hollywood autographs. I think it's around here someplace...lol
     
  18. TomReceiver

    TomReceiver Active Member

    Messages:
    253
    Location:
    central new jersey
    I had a set of ADC 303ax and I found them at a thrift store real cheap and all drivers and the slide switches did work. Hard to compare them to any speaker I had, EPI were always better as were my Polks but they did have a place in my living room for about 5 years. I was told that ADC made cartridges 1st then when into speaker production. Not a bad project speaker to work on and yes the tweeters were glued on w/ big 10" woofers w/ doped cloth surrounds.
     

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