I have a Marshall 4x12 with 2 V30s and 2 Hellatones in an X pattern. The drummer of my band has been away for a while so we havent had practice. The loudest I've had my amp (Marshall 2203) is about 4.5 on the master, but the Hotplate is at about -20db. At that volume am I getting a somewhat accurate feel of the speakers? I was a little worried how the 120 watt cabinet would handle high gain from a 100 watt head. When I have practice I don't use the attenuator, I'm just asking so if I have to change anything in the next 2 weeks, I can. Thanks!