20/06/24 - Big Twin 3 - NZ

Hi Alex

I own a BT3 that’s about 4 years old and I purchased it second hand in New Zealand.

I also own a newer BT3 I got off you late last year (awesome cabs the best I reckon)

Anyway its annoying me now but the older BT3 sometimes randomly  as I am using it at high Volume during practice it gives a terrible buzz distorted noise for about 10 second and then  sounds normal. I did email you almost a year ago but cannot find that email.

I have tested the drivers with an Ohm meter and they both read around 5.9 Ohms and the driver cones move without any noise and the centre speaker cone cap is secure. I am sure the drivers are fine. All connections seem fine.

I don’t know if the horn speaker is the issue ?? or the circuit board ?? where the speaker lead plugs into.

I have tried a new bass lead, speaker lead, separate bass and no change. I am assuming its the board ??, can you advice me first and let me know what you think ??  and price a board with shipping for me please. Sometimes it will just be normal sounding for about 3 practice events and just yesterday it played up so its random.

Thanks

Kershaw

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Hi Kershaw,

Sorry to hear about this fault! The best way to test the problem is to swap the modules between the cabs, so either swap the crossover/backplate module between the cabs or swap the HF driver and then swap the woofers too. If the fault moves with the component that's moved, then you know that's what's faulty (or it's that connection causing an issue). I presume the older cab is a BT2, not BT3? The only difference in the components is the crossover was redesigned to give more max treble on the BT3 but they can be swapped back and forth just fine.

There's a how-to playlist on our youtube to explain how to take grills off, speakers out, etc. Definitely watch that first and note how t-nuts behave, otherwise they can cause big problems. Email us for help if/before you get stuck!

Best regards,

Alex