Hey! So I'm looking at a pair of Audiosphere Research AG-271 's, not sure though. Never heard of Audio Sphere. From what I can tell they've had some decent speakers and some not so decent. Other then that I can't find much. I was wondering if anyone knew about this particular model though. Any thoughts on the model / comments on the model. And it would be great if someone could tell me about replacement parts for them because i need to replace the tweeter on both and the mid range. The subs are 8" The Mids are 5" and the tweeter is 2.5". Thanks!