I auditioned the amp approx. one year ago and it was completely silent upon power up. I would not use the amp until it is repaired as the pop can very easily damage your speakers.
My 4330R does that, too. I never turn it off unless a thunderstorm is coming and I have the presence of mind to protect it. It is a very musical "pop," I should add. My new Creek 5350SE does not do the "pop" thing.
The creek 4330 I use to have also made a popping sound when turned on/off. It never damaged my old Magnepan mmg's but I'd check to see if you could modify it for a soft start.
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