Zuki,
The only speaker I can think of where you can get good stereo with one unit is Nano. You can separate the high-end speakers and have one sub. OR, you can use two units in dual-mono, which gives you stereo if you route it correctly.
I have two Nano 300s that I use for extra things and backup and have used them both ways to with good results.
They are no line-array, but sound really good with great bass.
Might be worth checking out.