Crackling sound at high volume

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A dummy load is a resistive load a speaker is not. +

But I would check first the connection between head and cab, since it happen only with the 8 ohm cabinet I suspect the jack at cabinet to be faulty or simple it vibrates too much.
I had a 2x12 cab with a loose back panel, at high volume a good palm mute would throw the jack out of the socket :D
 
A dummy load is a resistive load a speaker is not. +

But I would check first the connection between head and cab, since it happen only with the 8 ohm cabinet I suspect the jack at cabinet to be faulty or simple it vibrates too much.
I had a 2x12 cab with a loose back panel, at high volume a good palm mute would throw the jack out of the socket :D

Great idea. I checked through another Mesa Cab, same prob:(

j
 
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More testing

-two 8 ohm 4x12 cabs in parallel with amp at 4ohms. crackle.
-one 8 ohm 4x12 cab with an 8 ohm 2x12 with amp at 4 ohms. NO CRACKLE?

The 4x12 is a mesa with 4 v30s. The 2x12 is a peavey 4x12 in stereo, using only one side with sheffield something or others.

This is banana crazy now.

Anyone have any ideas?!
 
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