Its a common problem. Try turning your components on an off in different order until you find a sequence that doesn't pop.
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Nothing wrong with the ML 433. It's cause the amp is hooked up to a preamp (most likely tubes?)
Do what ZD suggests and try a different turn on/off sequence.
Turn the preamp ON first, (volume down, source Off). Wait a minute; there may be some clicking in preamp during startup. Then turn ON amp.
-to power off, turn down volume, Amp OFF, Preamp Off last.
(Amp ON last/ Amp Off 1st)
I still get popping sound from all channels no matter which sequences I used.
Do you know any method to minimized this? Worried that it might damage the tweeters.
Mark levinson tech told me that this might be because I use unbalanced connection to the pre-amp. He mentioned that this issue should be fix going to full balance system. It this true? He mentioned about DC offset/discharge going to the speaker output instead.
Try using some inexpensive balanced cables as recommended. However, the cables must be truly balanced and not just cables with XLR connectors.
Radio Shack carries what they call XLR cables; they don't mention if they are balanced. Look for these...
You may also try to have all the unused preamp inputs connected using jumpers.
He's right. You definitely want to make sure really balanced, and not just SE with xlr connectors. If you live near a music store, you could try those Mogami balanced cables everyone is always talking about. They're not expensive. If you live near a Guitar Center, you can return the cables if they don't fix the problem.