First, to get the typo out of the way -- that's "Pearl," of course. Sorry to be like a school master.
Now, as for bass -- you can use the equalizer on the Carbon to get some more bass. Just the other day I was listening to "River of Bass" by Underworld (not a band I often listen to, but I love that song), and if that's not a good test of the Carbon's bass ability, I don't know what is.
The Rio's are good little units, and at the current going price, they're quite a buy. I paid 30 to 40 percent more a year ago for a 5GB silver Carbon than they're going for now, and I still think of it as a good value. I'm tempted to get one at today's prices and stash it away for future use. I also bought one as a gift, and the reviews from my friend have been very positive.
In short, the bass is good, and the value is excellent.