I have an Outlaw 7100 amp I bought from a forum member last October. I guess it's about 14 years old, looks brand new! I bought it to power my 4 overhead speakers for Dolby Atmos, but as it turns out I won't be installing them till late this year. I have it powered up when the rest of my system is on, even though it's not connected to anything. Do you guys think I can depend on this amp; do they usually last longer than 15 or so years? And am I doing the right thing having it powered up but not connected to anything?