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Cathedral4ever, the flerb mode with almost no modulation is very very very nice for bass.

I tried my Flint out on bass and that was fun. 80's verb with the decay pretty high up made shit pretty massive sounding.

I like the ILFDD+supernatural. I've been wanting to try a disaster transport+supernatural though

I love the Donny Day Delay on bass, and the RRR is hella badass too. OR, the Disaster Transport, which would likely be easier to find, is a great option on bass too.

Kiiiiiinda want another RRR.

You could try and track down a Ghost Disaster, which is the Disaster Transport + Ghost Echo. Or just sell a kidney and get the Moog MF-104M.

As for the verb, I haven't even looked at other reverbs since getting the RRR a few years back.

I want to say that most delays and verbs i've tried have been bass friendly as well as bass friendly.
I tend to prefer brighter delays for bass though, unless i'm trying to create a wash which most darker delays do.
Currently using an ILFDD and a Empress Tape delay, both very different and great at what they do!