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Double Bass Acoustic B20 or AB50. Will they work for me?

I'm a aging beginner with an unusual six-string, fretless, upright, acoustic bass. I have aspirations of playing blues and jazz with other serious amateurs in somebody's living room once a week--and that's it.

My current plan is to amplify my odd bass with a triple-headed K&K Pure Bass transducer through a K&K Pure XLR Preamp and into a small combo amp that is suitable for practice and light jamming with friends only. All of the user reviews for the Acoustic amp combos tout their clear, undistorted tone and unexpected volume for 20- or 50-watts. They also have a feature I very much like: A 1/8" input for mp3-type sources, which apparently will allow me to play play-alongs through the speaker while simultaneously amplifying my bass.

Unlike the AB50, the B20 does not have an output that could be used for direct recording, but a couple of reviewers have indicated that you can mic its speaker output well. I would want to record only to hear myself along with my play-alongs so as to evaluate my improvement. Audiolobe, my MacBook slow-downer, will let me play a play-along and also record myself with it at the same time, right through my MacBook mic, which records music surprisingly well--not studio quality, of course, but certainly good enough to evaluate my own play. Of course, with the AB50, I could record directly from the output jack. The AB50 has only three tone controls; the B20 has four.

Anybody see a problem with this idea? Or do you recommend a better way of doing this for my meager purposes? Or different equipment? (I haven't bought any of the above hardware yet.)
 
Jack,
I have a B20 which I bought for teaching and was pleasantly surprised by the nice tone. It delivers a warm, full tone with good clarity and decent headroom. Dual instrument inputs (single channel), 1/8" input and headphone output make it a no-brainer amp for practice and probably small coffee shop type gigs as well. I have tried my uprights through it, getting a pretty decent tone as well. Guitar Center will let it go for $99, making it a bargain. AB50 is also nice but I don't think it sounds better than the 20 watter.
Just my $.02 opinion.
 
Thanks, clink-

I'm very glad to hear about your good experiences with these combos. Based on that I went down to Guitar Center and had a closer look.

I've now heard an mp3 play-along played through an AB50's 1/8" input. I was amazed at both the volume and clarity. I had been concerned that, being a bass amp, it would not reproduce the treble instruments--i.e., the chord player, the ride cymbal, the soloist--well enough to want to use it with play-alongs or performance CDs. But not a problem!

My bass doesn't have a pickup installed yet, so I'll have to wait on that, but I did play an acoustic BG through it. Way, way more power than I'll need. It's not nearly as good a deal price-wise as the B20 ($199 versus $109), but I like the output jack, the extra head room, the 10" & 2" speaker combo, the tilt-back cab, the instrument/mic input versatility, and even the detachable chord--so I'll probably be going with the AB50.

(Guitar Center is telling me that it owns Acoustic now. That was news to me.)

Thanks again for your very encouraging response!

BTW, you live in one of my very favorite cities. We've been to KC on vacation visiting our son at KCAI several times. Great people, steaks, barbecue (Arthur Bryant's), and Jazz. My favorite jazz is Bram Wynands and Hal Melia at the Majestic when Hal comes back to town. (We actually planned one trip around his gig there.) But we also hear good sounds at Jardine's, the Blue Room, and other spots. Gotta get back there soon. Two years is getting two long to be away from that Town.
 
Just a follow up:

I eventually bought the Acoustic AB50 and it works great for what I need--which is as a practice amp and to play mp3 play-alongs through it. At first I thought it had a buzzing problem with the notes G, Ab, and A, but that turned out to be how I had it positioned in the room--much too close to some furniture. As soon as I moved it away a bit, no problems whatsoever. If I ever get good enough, I think I could use this little 50-watt combo in a small venue, too.
 

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