1. Please take 30 seconds to register your free account to remove most ads, post topics, make friends, earn reward points at our store, and more!  

Acme Cab No Longer Working

Discussion in 'Amps and Cabs [BG]' started by Aaron, Jan 7, 2007.


  1. Aaron

    Aaron

    Jun 2, 2001
    Bellingham, WA
    During a gig a few nights ago I had an Acme cab make a weird buzz. At first I thought it was something vibrating as the buzz was most prominent on certain frequencies (Eb was a killer). During the second or third tune, the buzz became progressively louder and the cab completely stopped working.

    I have never had the experience of blowing speakers before, so I don't know if this is it. The drivers have some wear, but as far as I can tell, there are no tears or holes. Since then the cab has not worked at all- it produces no sound whatsoever.

    I am fairly positive it is the cab, as my Schroeder is fine through the same setup, and my other Acme cab works, although it is making a similar buzz, which makes me wonder. I don't know if it is a coincidence or if my poweramp damaged the cabs in some fashion or another simultaneously.
     
  2. fdeck

    fdeck Supporting Member Commercial User

    Mar 20, 2004
    Madison WI
    HPF Technology LLC
    Complete silence is a good thing, because it means the drivers are probably not broken. Perhaps a loose connection that vibrates sympathetically to the Eb. Dodgy input jack is my guess.
     
  3. Aaron

    Aaron

    Jun 2, 2001
    Bellingham, WA
    I tried wiggling around the input jack, and it did nothing. I'd almost prefere a blown driver, because I'm pretty sure the only way to access the cab's insides is taking out the speakers- please tell me I'm wrong about this?
     
  4. Jim Dombrowski

    Jim Dombrowski Supporting Member

    Jan 16, 2002
    Colorado Springs, CO
    I don't recall if the Acme's have a fuse (or automotive bulb) for driver protection.
     
  5. fdeck

    fdeck Supporting Member Commercial User

    Mar 20, 2004
    Madison WI
    HPF Technology LLC
    Taking out a driver is the typical access point for most speakers. It is not insurmountable. If the jack panel comes off from the outside, you might be able to reach the most important guts that way.

    Proceed slowly.
     
  6. Johnny Crab

    Johnny Crab ACME,QSC,Fame/Hondo/Greco/HELIX user & BOSE Abuser Gold Supporting Member

    Feb 11, 2004
    South Texas
    Other AMCE users want to know:
    What power amp and RMS watts/channel into each cab?
    Are these still in warranty?
    ACME's have a light bulb for the mid & tweeter protection.

    I've encountered blown bass speakers before(not ACME's). They either quit altogther OR start making a strange sound which is usually the coil assembly rubbing as it tries to move in and out but can't because it is scraping(overheated and got out of round). Both cases were fixed with a re-cone job.

    Just to be sure, try a different amp on both ACME's. If you get the same results call Andy tomorrow. If not, your amp's gone south...

    LET US KNOW what happened and/or what Andy says.
     
  7. idealtracks

    idealtracks

    Dec 18, 2001
    The Acme's do have a bulb for protection of the mid & tweeter--but when it goes, you should still have sound from the woofer.

    I have not had problems from mine.

    I would plan to email or call Andy Lewis tomorrow yourself--he is super-friendly and will probably talk you through troubleshooting this personally. That's another great advantage of this brand!
     
  8. Aaron

    Aaron

    Jun 2, 2001
    Bellingham, WA
    I don't have another amp handy, but the amp works fine with my schroeder cab. The cabs are not under warranty, they are the series I cabs. At the gig, I had it wired for tons of wattage (can't remember the exact ratings on the amp, but around 700/1300 for one cab @ 8 ohms depending whether I had it bridged or not. I have been running them with that type of wattage with the same amp for 2-3 years without a problem. I was not driving them hard. No peaks, the room was fairly small and live, so it was not cranked. I might be able to borrow a friends head tomorrow to check them out, but I'm fairly positive that it is the cabs, being that one B2 is silent, the other is normal volume but with a weird buzzing, and the schroeder works fine.
     
  9. Aaron

    Aaron

    Jun 2, 2001
    Bellingham, WA
    I just checked both cabs again. On the cab previously known to be silent, I just noticed that the tweeter and mid-range woofer were off. I cranked them up and sound came out, but only out of the mid-range driver. On the normal volume cab with buzz, it has a loose input jack (actually both are loose).
     
  10. Johnny Crab

    Johnny Crab ACME,QSC,Fame/Hondo/Greco/HELIX user & BOSE Abuser Gold Supporting Member

    Feb 11, 2004
    South Texas
    If you're pulling the grills anyway, you can CAREFULLY(be gentle and don't push much at all) check the physical aspects of the speakers by pushing evenly on the speaker cones to see if they move freely. Any binding/scraping due to coil damage posted earlier will be felt in your fingertips. SVT 10's and JBL 15's were "found out" with this method in the past as they started to "sound strange" but hadn't gone out completely.

    Hopefully you'll just have a blown light bulb in one and worn out jacks in both. These are 1/4" or Speakons that are loose?
     
  11. Aaron

    Aaron

    Jun 2, 2001
    Bellingham, WA
    1/4"

    They don't seem loose, but they cut in and out with the jiggle test.
     
  12. You need simply to fix the 1/4" jacks. The best way to do that would be to replace them with some Speakon connectors, but you could simply just replace or repair your existing jacks. Your problem could also be due to loose connections to the 1/4" jack.
     
  13. Aaron

    Aaron

    Jun 2, 2001
    Bellingham, WA
    Andy gave me a prompt reply to test if I have a blown woofer or two. Since I don't have an ohm meter, Andy told me to put a 9v on the input to see if the speakers would jump. Nothing happened other than a spark from the 9v to the input jack, even on the cab that somewhat works but buzzes. I took the grill off (of the cab that is pretty much not working at all) and one woofer moves, while the other is very stiff. Looks like one blown speaker on that cab. Not sure, though.
     
  14. Aaron

    Aaron

    Jun 2, 2001
    Bellingham, WA
    It looks like the culprit is coil damage. One speaker in the nonworking cab is completely stiff, while the other cab (one that works at normal volume, but with distortion) has a speaker that seems to exhibit symptoms of that previously mentioned "scraping".

    I find it weird that I had been using these cabs under the same conditions for 2-3 years- even harder conditions- and I managed to blow two woofers in the same night.
     
  15. Johnny Crab

    Johnny Crab ACME,QSC,Fame/Hondo/Greco/HELIX user & BOSE Abuser Gold Supporting Member

    Feb 11, 2004
    South Texas
    -1
    I find it sort of inspiring that the speaker manufacturer made them with such close QC/tolerances that the failure times DID happen so close together. Not good that they're blown BUT three years of pounding 2~3 years of pounding and in "even harder conditions" ain't bad.

    I would get that amp looked at to see if it's putting out anything besides the signal....just to make SURE you don't get new speakers and have an amp eat them There's a minor chance of that.
     
  16. Aaron

    Aaron

    Jun 2, 2001
    Bellingham, WA
    Well I bought them used and have no clue how old they are. I don't know when the production of the series I cabs stopped.

    I definitely would not consider it "pounding" when the cab blew. It was at a very reasonable volume for a small and live room. I brought two cabs with me and was only using one because the room. I'll definitely try to get my amp checked out, it might be up to no good.
     
  17. fdeck

    fdeck Supporting Member Commercial User

    Mar 20, 2004
    Madison WI
    HPF Technology LLC
    +1

    An amp putting out DC could toast a woofer, or push it to the point where it is on the hairy edge of getting toasted by a bit more sound.
     
  18. Aaron

    Aaron

    Jun 2, 2001
    Bellingham, WA
    Does Andy Lewis recone or replace Acme speakers? Would that be a better bet than getting them reconed locally?
     
  19. BillyB_from_LZ

    BillyB_from_LZ Supporting Member

    Sep 7, 2000
    Chicago
    He replaces them. His prices are quite reasonable. I wouldn't have them reconed as his woofers are pretty unique (although they're made by Eminence).

    When you replace them, be sure to break them in carefully. Ask Andy for recommendations on how to do it properly.

    Since the woofers run full range, now would be the time to change the impedance if you've ever thought about it...
     
  20. alexclaber

    alexclaber Commercial User

    Jun 19, 2001
    Brighton, UK
    Director - Barefaced Ltd
    My Acmes are the first of the Series II cabs and I got them in September 1999.

    Alex
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.