I am currently in the process of installing a Loksound 3.5. See this thread:
Peter
Take a look at the TDS Mini Oval (tdsminoval) speaker .95"x.55"x.15" and the appropriate enclosure, the TDS Enclosure Mini Oval 1.05"Lx.63"Wx.25"H at Tony's Train Exchange. When put together, the result is only a little higher than the enclosure. Some day I plan to see if this combination will fit inside my MP15DC, if it does it will give excellent results.
Don
I installed the TCS M1P-15. works great.
I'm now looking to upgrade mine to "gold" status. I was thinking about the new tsunami but I'm unsure what speaker fits into the stock housing that will also work with the new decoder.
My Favorite is the QSI revolution if you want sound. For a basic motor/light decoder I really like TCS decoders.
Joe
S. Crabtree
http://www.virginiamidlandrr.blogspot.com/
http://www.pbase.com/vamidlandrr