I've played quite a bit of amps amps and cabs over the years, and the new flat response cabs have been great for upright, audiokinesis and Michael arnopol. I'd like to add a new name to the mix for me, Wayne Jones! Similar to the MAS stuff, this powered cab and preamp are killer for upright. The low end is so tight and clear that I'm able to boost the lows and get a great supportive and clear tone. Check out this quick and dirty video I did, it' almost indistinguishable to hear the difference in amplified tone compared to acoustic, and I had the amp going pretty loud!