I use a Quilter Power Block 300 for my bass amp. It doesn't have a lot of variation in terms of EQ, but it really doesn't seem to need it. It's got plenty of output, and I can get a little grit out of it if I want it.
I pair it with an Avatar 4x10, and mostly use either a parts P bass I put together, or my OLP Tony Levin 5 string. I like the sound I get, and I don't get any complaints from anybody I work with.
I got the Quilter to use with guitar originally, and it did a great job that way too. But after using it for bass, I sold both of the other bass amps I had, and the Quilter is my only one now.