I stated playing in a new band, noise-funk oriented and as addition to my rig, I play through Ibanez Tube Screamer pedal (distortion-like effect). Is there any chance of damaging speaker? Amp is Fender Bassman 100 (100 W tube head) and cabinet is Peavey 115BX (350W, 4 ohms). Reason I'm getting worried is some metalic cracking-distorting sound coming from speaker when I play harder on E string (this happens when pedal is turned off). It distorts because i set volume high (nearly max), but this cracking freaks me out. It is not noticable when playing with a band, but I can hear it when I play alone. Could it be weak battery in pedal?