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Acoustic B450 Driver replacement

Discussion in 'Amps and Cabs [BG]' started by solvera2010, Jan 7, 2014.

  1. solvera2010


    Dec 9, 2013
    Hi all, I bought a used Acoustic B450 combo amp with big discount because one of the drivers was blown. I have been getting mixed information from GC and Acoustic. GC says the max wattage is 225 and Acoustic says 225 is RMS.....

    I need some clarification... should I listen to GC or Acoustic and does anyone know what kind of speakers I can put in???

    I had bought some speakers on EBay before emails from Acoustic, but RMS is 150 and max is 300.

    Thanks for your help.
  2. I would say GC is closer to correct but I would not place any bets they would handle 225 peak. It's a entry level import house brand, don't know if you could find the originals other than from "Acoustic".
  3. solvera2010


    Dec 9, 2013
    Yeah and they aren't too open with where I can get them or even if they will send me a pair for a price. I guess I'll wait for the speakers to get here and will give it a try. if they can't handle the load from the amp then I'll just have to scramble another way.

    So here's my poor attempt to understand amps, wattage, and speakers.

    My amp is rated as a 450 watt combo amp. That is the max internal speaker wattage. So if I get two speakers at 225 max that equals 450. max usage of each speaker right?

    OR is it 450 watts per speaker??

  4. The amp "puts out" the power depending on the load. Speakers are rated for maximum they can accept from an amplifier without burnout. If you have multiple speakers they share the power from the amp. If you have four 200 watt speakers with an amp that can output 450 watts, each speaker can receive 112.5 watts.
  5. solvera2010


    Dec 9, 2013
    Well, I got my replacement driver and installed it into the cab. Turned it on, played and it sounded like crap!! 1. either crappy driver. 2. wattage RMS being 300 is not enough or better yet the driver can't handle performance that high. Well next on my plans is I ordered a driver from ebay, will hopefully get that this weekend. Also, I didn't know this but blown coils can be repaired! I'll be doing that with my blown driver to be a replacement. It never fails me the constant learning opportunities that life brings me. Love it!
  6. Chances are with #1 or the box doesn't meet the needs of those speakers. Voice coils can't be "repaired" as you need to pretty much destroy the speaker cone it is glued to get to it. They do have re-cone kits for many speakers that include new voice coils, cones and inner/outer suspensions.
  7. solvera2010


    Dec 9, 2013
    Thanks B-String 2.....
  8. No trouble. One of the things we learn with bass cabs is not just any speaker will work in any bass cab and a different speaker when combined with the originals can turn out REALLY bad. :)
  9. RickenBoogie


    Jul 22, 2007
    Dallas, TX
    +1 chances are, dropping in an unknown driver into that box will end in failure. You need spkrs that are spec'd for that box. Acoustic is owned by GC, and they are made in China, with Chinese spkrs.
  10. RoadRanger

    RoadRanger Supporting Member

    Feb 18, 2004
    NE CT
    Thought I'd piggyback on this thread. A friend of mine cooked one of his drivers so today we replaced both with 16 ohm cast frame ones I had (Madisons from way back, maybe OEM Newports?). This serves two purposes - it lowers the power to them down to about 300w which is all that's safe for a 2x10 IMO, and better matches the 15" extension cab he usually uses it with. Also it will be running a bit cooler as the total load will now be 4 ohms instead of 2.66 . He thinks it sounds better too, dunno if it's just "new stuff" syndrome ;) but he has a gig tonight and I'll be running sound so we'll see :) . I took the still good(?) driver as a spare for my Acoustic B810 cab, I assumed it's the same driver but maybe not as the B810 drivers are only rated at 100w each I think? Oh, and be aware that the drivers are REALLY close together so it was quite the squeeze to get the cast frame ones to fit.