Without any doudt, leave it on at all times. Also, do not keep it on carpet or directly on the floor. Even if all you do is to cone it, the improvement will be dramatic.
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Four 2" cones at least is a great idea. Vibrations have a very negative effect on electronics. While you're at it, put cones on everything in your system. You will be glad you did. Go on the Audiopoints.com website and you'll be set free. Don't you keep your amp on all the time? My amp has been on for 6 years. You'll know after you leave it on for 2 hours. Listen then, and see if you can hear a difference. You should.
Leave it on continuously if you can afford the increase in your electric bill, else shut off and unplug. Simple, isn't it? By the way, the P600 is built to be on continuously without damage. I asked PS Audio about this. Just remember to vent it well such as putting it on a dedicated amp stand and coning it.