speaker

First post on this forum... I recently bought a 2006 K1200LT. Initially, neither the radio or the intercom system worked. I went through the computer reset with the negative side of battery disconnected. The radio now works through external speakers only. When I plug in the helmet speakers...

I am looking into changing out the speakers and radio in my 2003 K1200LT. Anyone with experience have specific recommendations for speakers that will fit the front and the rear? I am not looking for audiophile quality... More so durable and affordable. I am actually going to hire a BMW...