tweeter

hey guys, im really worried about my cab. Basically, i usually play with the tweeter completely off, but someone said it will burn up the crossover, so lately i've had the tweeter on a tiny amount. anyways, in the past few days ive noticed that the tweeter (i think) is making a weird...

On the Sweet 15.1, is the tweeter on when the switch is in or out? I am having trouble telling the difference between the two, and I am not sure if that is just due to a subtle tweeter or if it is broken. Knowing which way around it should be may help a bit. Thanks/