Poping noise starting up Mcintosh MA 6900

I also own the McIntosh MA6900 integrated amplifier and my unit does not make a "popping noise" when I turn it on. I do not know why your unit is doing this. Please call the McIntosh retailer you bought the unit from and ask them.

What does the Pope have to do with McIntosh noise?

I went to McMasters training, and have a working acquaintence with the products.
Popping through your speakers is not good. The pre amp could have some bad capacitors. The issue here is that if something goes, you could conceivably pass dc, that is direct current, destroying your speakers.
Call McIntosh directly, and get their service department on the line. In the meantime, if you bought it from a local dealer, and it is relatively new, ask him for a brand new one to replace it. McIntosh is really, really, good about this kind of customer service.
Good luck,
Oops, another thought, though a little obtuse. could the popping be coming from noise in the line, and simply coincidental to turn on. (Refrigerators coming on etc send jolts through the line, and I have actually seen this blow tweeters) But that is not the issue since, it only happens on turn on. Just a random thought.
Larry

Ibog,

What speakers are you using? The amp can not pass DC as outlined above because of the output transformer. I would turn the volume down and see if you still hear the pop. This may be system related and coming from a source component connected to the MA6900 or a ground loop. What are all of the components in the system including any AC conditioning?

Ron-C