Speakers on a showbike, ok, but on an ordinary bike, not a chance. Id rather use my headphones, and wont be hearing alot from the speakers afterall if your using hearing protection. Sorry for being negative about this. The speakers themselves could be really good.
Where do you plan to place them anyway?
Have any plans hooking theese up to your gps or phone? Would be quite a laugh
Going down the road broadcasting your phonecalls at 75db.
The ninjette engine works perfectly fine as music to me