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Bass Cab Buzzing

ive got a Gallien-Krueger400RB head
and an Ampeg PR400HLF Cab

when i turn up the cone dial on the back of the cab, i get a buzzing sound when i play certain notes..
maybe my frets are too worn..
I dont know if its the cone/horn buzzing or the speakers...
I've had the horn dial at 00/infinite and been playing hard and good for past few days..
i prob shouldnt of i guess, and when i turn it to the right towards the 4-3-2-1,
it really buzz's so maybe i blew the horn or somthing..
and its a 280watt amp on a 600/1200 watt cab..
so i donno, should i rent another amp and bass guitar and test on my cab.