I bought my DRRI because it had lots of bass. I'm very satisfied with the Jensen C12K that came in it. But I decided to try a Celestion Heritage (more costly) G12H, and I got the one whose bass response goes down lower, the 55Hz. When I put it in, I was a tiny bit disappointed that it wasn't QUITE as bassy as the Jensen, but it was close enough.....but the CLARITY of the speaker, holy crap. It made the Jensen sound muddy in comparison. So now I LOVE that speaker in there. It's only 30 watts, and the DRRI is 22 watts, but I'm not worried since it's a Celestion. I've dimed it to kind of test it, and no prob. And I mean dimed it with full chords, not just notes. I bought another one since for a 1x12" extension cabinet I had. It's BIG sound with 2 twelves now. Since then, I bought a Celestion Creamback (the heavier 'H' magnet and 75 watts) and I put it in my Badcat which is styled after a Fender Deluxe Reverb. It's a fantastic speaker in that, so I'm sure it would be great in the DRRI also. I would propose using a 50 oz. magnet speaker in that amp since the stock Jensen has a 50 or 52 oz. magnet, and that amp DOES have a lot of bass response for the speaker to put up with.