Hey Joe,
Some sound advice here, but without knowing the actual current draw, it's all guesswork. How big is the fridge? A full-size fridge will pull some serious power when the comp kicks in.
You could get one of these:
http://www.p3international.com/products/p4400.html Start with the fridge. Write down it's power draw when the compressor is on. Do the same with the other gear. For ease, you could plug all of your audio gear into a power strip and test them all with the Kill-A-Watt. Add up the total wattage draw. You will now have an
approximate (because amps pull more power as you bring up the volume) estimate of your total draw. When you have that, consult with Herb (who does electrics for a living) about the safety of that draw on a 20 amp breaker.
This little thing can save you a ton of money as well. Test everything in your house. You will be surprised at the stuff that is wasting electricity while it's
OFF! If it were me, I'd just unplug the fridge for a while.
Regards,
Bob