So, I'm a guitarist, but I was looking to get a cheapish bass rig to play with my son in the basement. He's 13 and plays the drums. We try to bash out some surf tunes, but not super loud. Was thinking of getting a Fender Rumble bass amp. My question is will a 40 watt amp work for my needs? Again, not gigging out, but jamming in the basement with a young teenage drummer. Or do I need to kick it up to the 100 watt amp just to accomplish that much without having to dime the volume and rattle the cabinet? Thanks!