I've been asked to play my acoustic guitar with a friend who sings gospels songs at some nursing homes. I'm guessing the amount of people we would sing to would be between 12-20 people? I always like to bring a good sound to the mix and from that have bought BIAB of which I am very pleased. However, I've started to consider what speaker system I would need to be able to plug in my guiar, mic and iPod [BIAB backing tracks]? I don't have a big budget and dont want to get sucked into buying a full on PA which is overkill. I own an AER Acousticube which is a very good acoustic guitar and mic but not so good reproducing smooth low end bass notes from BIAB. Thing is I've been spoiled with my computer speaker system 2x B&W speakers + Rel Sub. The sound really rocks with the sub so I'm looking for a portable speaker system that can reproduce the nice low end bass notes that I've come to enjoy from my computer. Good bass makes all the difference I believe.

I've seen these Web Page but I'm not so sure they would do the bass any justice?

This option looks more plausible YouTube especially from 3min onward in the video.

Maybe I'm looking for the impossible but does this speaker system exist?