Looking for a light bass combo amp that can thump

[Nedmundo]

GK MB112 II,,28 pounds more power than you need if your miking so it makes for a good monitor as well and it also has a DI built in...

Yeah, these sound great, and IMO a big advantage is the available powered extension cab for a more serious rig. If I were starting from scratch, I'd get this.

I also think the Roland Cube 120XL would fit the bill. The Cubes are much, much louder than their power ratings indicate, and with the built-in tuner, on-board effects and amp models, compressor, and DI, they are enormously flexible. I use my old Cube 100 for light volume situations, recording, rehearsals, or when I only need a stage monitor, and it's great. With its larger enclosure, the current 120XL should deliver even more low end. They are a little pricey, and probably not worth it if you won't take advantage of some of their unique features.

 

[Monster_Engine]

I just got a GK MB500 and a GK 212MBE and I couldn't be happier! I just came from using an SWR WorkingPro 700 and Eden 410XLT, and to me there's no comparison. The range of tones I can get from my new rig (which weighs 1/3 as much as my old rig) is limitless, and the portability is great. The cab kicks like a mule too.

I know this thread is about lightweight combos- so even though my rig isn't a combo, consider my hat thrown in the ring for one of those GK 212 combo things. It's basically identical to my setup.

 

[High Camp]

Ye ole Ampeg B100R combo is fairly lightweight, thumps hard and low and has a pretty good volume. (ported and 15 inch)
and looks good too!
Good luck finding one used, since they haven't been made in a long time.
(I missed one by a hair a couple of weeks ago)