How does that TL bass compare to the Nimbus bass?
Tough call . . . Nimbus is clean, articulate, powerful, effortless, all adjectives that can apply to the Joule. The TL is a more inert acoustic space in comparison with the vented enclosure in Nimbus. The difference is mostly due to the use of stuffing in the TL which occupies the space between the woofer and the terminus. The path between the woofer and port in Nimbus is a more typical vented setup, with mostly empty space between the woofer and vent. There's a bit more upper bass "leakage" making its way out the port in Nimbus which we account for when we voice out the crossover. Joule lacks that particular property, and the result is a "deader" bass presentation, if that makes sense.
We could probably accomplish the same inert space by moving the port on Nimbus to the rear of the cabinet which would allow for the use of stuffing to create more attenuation of the rear woofer radiation making its way out the port. But that update is a ways down the road, though I know Ed is looking at an attractive method to pull it off.