Originally Posted by
rickm
Just received my Sierra 2-EX upgrade kit. Installation went smoothly. Directions are first rate and easy to follow. Only tools needed are a phillips screwdriver and a ½ inch socket. I thought the Sierra 2's were great (and they are). The addition of the upgrade kit takes them to a new and higher level! The sound is even "awesomer!" The base is noticeably deep and lower. I turned my sub's volume down a bit. When listening to music I thought I knew very well, it sounds like there are new instruments playing in the song. Subtle clarity is improved. I'm overwhelmed by the added details. Every thing Dave has said about this upgrade is true. If funds permit, I'd highly recommend doing this upgrade. I think of my speakers as "Sierra 3's" now!