Hey Wolfpack, I was wondering if you had found a bass knob for that 81000d yet? I have been looking for one too, and can't find one, really makes me with I would've bought one with the amp. I really love this amp, its got more than enough power to push my two Alpine Type R's at two ohms, but I don't like not being able to go ham when I want and/or take it easy when I need to. Let me know if you've found anything and I will keep you updated on my search.