Can a garage serve as listening room?

My system is currently located in my living room, which is a nice big room. However, due to space constraints (wife imposed of course), and the dangers posed by ambulatory toddlers, I have considered moving my system to my garage. However, I fear that a metal garage door, and concrete floors will probably have negative sonic ramifications. Is this so?

All responses will be greatly appreciated.

Regards,

ELG