The DeVore can do bass nicely but its important to keep in mind the speaker is not designed for a tube amp with a higher damping factor. At shows DeVore is often seen using an SET with no feedback which has a lower damping factor. He is relying on this for the speaker to make bass properly.
This is why some higher powered amps might not be ideal on this speaker. Its not the power that's the issue- its the fact that the speaker is not meant to be heavily damped by the amp.
I knew that they sound better with lower power tube amps of about 30 watts but did not know why. And yet between my eight watt Ampandsound Nautilus and my two ARC amps (150 and 80 watts) I prefer the higher powered amps. I am rather sure both ARC amps have high damping factor-I believe around 14. Bass is tighter and more satisfying with my higher powered amps. When I say that the Orangutans sound better with lowered powered amps like a 30 watt Leben I am referring to the overall presentation.