Ampeg Bass cab "thunk" noise when tipped

Discussion in 'Amps and Cabs [BG]' started by MICKUSS, Jul 13, 2017.

  1. I just bought a brand new Ampeg Portaflex cab(PF115LF). When I tip it from side to side and forward\back there is a "thunk\knock" sound. All the screws around the speaker and jack plate are tight. I couldn't see anything inside, and there's no weird noise when played through at loud volume.
    I assume it's the speaker moving and hitting the bracing.
    I've never had a cab do this before. Does anyone have any input?

    I took it into the store tonight and of noise there. Brought it back home and it's there again. I can still return it if I choose to.
    cazclocker likes this.
  2. Return it.
    BassmanPaul, Aqualung60 and MICKUSS like this.
  3. Yeah you're right. It's just so pretty I hate to see it go.
  4. Might be cat in there.
    One time my clothes dryer started going thunk, thunk, thunk, just after I started it.
    Opened the door and the cat jumped out.
    Rich Fiscus, ak56, Bodeanly and 8 others like this.
  5. basscooker

    basscooker Commercial User

    Apr 11, 2010
    Northern KY
    Cab fan, hobbyist
    T- nut?
  6. I think those go clink.
    I thunk those go clunk.
  7. basscooker

    basscooker Commercial User

    Apr 11, 2010
    Northern KY
    Cab fan, hobbyist
    True. Not enough mass to make a "thunk"
  8. I think it's definitely the speaker moving. Exact same sound every time I tip it. I can feel the weight shifting too. I'm assuming it shouldn't be doing that even if it work fine now.
  9. Killed_by_Death

    Killed_by_Death Snaggletooth Inactive

    I'd take the jack plate off & see if I couldn't see what's moving.
    (oops, seems you already did that)
  10. Wonder if there is a loose internal baffle?
  11. Perhaps if you increase the tip, say to $5, your cab will say "THANK", instead of mumbling "thunk". :D
  12. Here's a tip. Don't quit your day job.
  13. Thanks for your comments(and jokes) guys. It's going back to the store.
    BBQisgood likes this.
  14. Al Kraft

    Al Kraft Supporting Member

    May 2, 2016
    Northern Virginia
    Good call...they can always get you another new one to replace it and you won't spend the rest of the time you own it wondering if and when the other shoe will drop (so to speak).
  15. BornAgainBass

    BornAgainBass Guest

    Jun 21, 2017
    Houston Texas
    Amp Gnomes! But seriously, return it ASAP and make sure they check it off as defective lol.
  16. Thumpin6string

    Thumpin6string Supporting Member

    Apr 25, 2013
    Shoals Indiana
    Maybe they left an extra speaker inside.:D
    Last edited: Jul 14, 2017
    b-b-b-bass likes this.
  17. Maybe a factory worker hid a beer bottle in there when he saw the boss coming.
    OK, I did hear about a guy that had a thunk in the door panel of a new car
    and the dealer found that.

    New anything should not have an expected loose anything inside.
    Return it.
    If you bought it from a local store let them open it to see what it is.
  18. JimmyM

    JimmyM Supporting Member

    Apr 11, 2005
    Apopka, FL
    Endorsing: Yamaha, Ampeg, Line 6, EMG
    Patient says to the doctor, "Doc, it hurts when I do this."

    Doc replies, "Don't do that."


    I am going to assume you took the wheels out of the little black bag attached to the bottom of the inside of the cab with velcro. If you did, I'm going to also assume you tried it with the wheels both installed and not installed. If you didn't, then I'm going to recommend that you do all those things one at a time and see if if the thunk goes away. And did you install a head on the fliptop lid yet? I would assume not since you just got it, but you might want to recheck it and maybe reinstall it if you did. And then I'd recommend flipping it with the lid off and looking inside to see if you can see or feel the speaker magnet shifting. I would try all those things before I returned it. You can always return it and get another one if that doesn't work out, though.
  19. Hand slap

    Hand slap

    Feb 14, 2016
    Maybe there is something between the paper cone and frame, in one the speakers, I would describe that as more of a "tink" then a thunk? Tear it down as far as you can, maybe you will find it, and not deal with returning it? Out of box issues, happen.
  20. Have the Dealer figure it out.