I recently purchased a used Bazooka tube from a guy on craigslist, and based on the wiring diagram
, and the illustration of the back panel, I'm pretty certain it's an A-80.
I've read through a variety of threads on the forums about this issue, and I've still been unable to resolve the issue despite re-wiring the tube several different ways.
Here's a bit of information about my setup:
- Aside from thumping issue, unit works and sounds good.
- Tube is installed in a VW Vanagon Westfalia with an auxiliary battery system.
- This aux. battery directly feeds a secondary fuse panel. Aux. battery and fuse panel are chassis-grounded.
- Bazooka is powered directly from fuse panel.
- Bazooka is grounded directly to chassis bolt, tested at 0 ohms
- Stereo head unit (Alpine idaX100) also powered from aux. fuse panel on separate circuit. Grounded to dash via stock ground location.
- Both the stereo head unit remote turn on and the bazooka's orange 'remote' wire are toggled by a single switch installed in the dash.
- Bazooka's Auto Turn-On jumper is set to the 'off' position.
- Bazooka connected via low-level RCA inputs.
- Bazooka thumps on power on/off regardless of whether inputs connected or not.
- Also tested set-up with 'auto turn-on' configuration (moved jumper, disconnected orange wire) instead of the switch toggle, and that thumped as well, so it's likely not the switch.
All-up, the connections seem very straighforward, and even when all other connections aside from +12v and GND are disconnected, and the unit is switched on via the orange remote wire, the unit thumps on power up/down.
Any insight into how to resolve this thumping would be hugely appreciated!! I'm properly baffled.