I've looked at in recent times many audio systems for the computer (MacbookPro) or consulted after my Haarmann / Kardon Sound Sticks after about 10 years gave up the ghost ....
So, first of all ... Yes, there is a background noise exists! BUT: Yes, the noise can be heard with the other 2.1 systems by vicious and Haarmann / Kardon! But again: it is heard only when one is extremely close to the eavesdroppers at the Speaker and who has before should anyway prefer to resort to headphones!
The Companion 3 Series II: Highly strong and balanced sound! For me as a DJ and house producer a treat! I've noticed that a lot of votes in Internet reviews either absolute contra Bose or pro Bose go. It may also be due to the relatively high price, but you get here a system that is absolutely perfectly finished and feels very high quality. Sonically I can well imagine that I let the parts run sometimes on a spontaneous party at home; because the Power have these little speakers you look otherwise vain.
The Teufel Motiv are indeed as pretty, just have a "background noise" :) and are just as powerful, but they cost (if cheap shopped) the same or even 50 euros more expensive. For me, the systems are absolutely identical and phonetically, and indistinguishable from a processing perspective.
The long time used Haarmann / Kardon Sound Sticks: These speakers are indeed quite nice and especially by her design, but in processing quality and sound they are not enough long to connect with above mentioned systems. Now you have me for a long time served us well but what is really negative: The speakers are still running perfectly after this time, but the seals on the groove of the speaker have become porous over time, so that the speakers fall apart at a touch ...: ) ... I would say that doing noticeable the difference in price of the systems.
Résumé: I can only advise to buy the Companion 3 Series II, because in almost every respect they are the devil system in every way (Both systems are great) and in conjunction with the current Macs also damn cool !!! As I write this post I listen to the sounds and am absolutely satisfied. Full kudos to Bose !!!
LG