Hey guy, I don't know if this is normal. The bass player in my band has a Ampeg SVT 410HLF Cab with a Markbass Little Mark II. Now, when he plays loud the speakers inside the cab light up. Depending on how hard/loud he plays, the speakers become brighter. I think higher tones make it happen more. Could someone PLEASE explain this to me? Tell me if it's bad, if it doesn't matter, if it needs repair/maintenance. Gabriel. edit: Apparently is happens when he uses the SansAmp Bass Driver DI.