If the amp is not powered for a very long time the capacitors in the output circuits can dry out and then they have to be replaced. I had my 7125 stored in its original packaging for almost three years with no problems. I would expect no issues if you stored it for a year but since it is a pre-owned unit you should put it in your system for a bit just to check it out. I would expect Outlaw to have the Phoenix out before a year but I have thought that before.
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Music system
Model 990/7500/Magnepan 1.6 QRs/Technics SL1200 MK2/Aperion S-12 Subwoofer/OWA3/Sony NS75H DVD
APC H15 Power Conditioner

TV System
Large Advent Loudspeakers/ Polk center/Monoprice surrounds/Panasonic Viera 42 inch/Onkyo HT-RC260/Sony BDP S590/Directv


Home Theater System
Onkyo PR-SC886/Outlaw 7125 Klipsch RF-82 L/R,RC-62 center, RB-35 SR/SL, BENQ HT1075, Outlaw LFM1-EX/OPPO BDP-83/Directv
Harmony ONE
Blue Jeans and Monoprice interconnects
APC H15 Power Conditioner