Hey all,

I have the 990/7700 combo and 2 Monster 3500 power conditioner's in my system. The 990 is plugged into the pre outlet which is switched, the amp into the amp outlet which is delayed. I never had any problems with sounds. Now when I push on the Monster 3500, I get a strage sound from the speakers as the amp is staging on. Kind of a buzzing type noise for just a second or 2.

I noticed that the 990 has no ground prong on the plug end, not sure about the 7700. Would I benifit from say a 3 prong plug end?

what would all of sudden cause this. I am redoing all the cables and as far as equipment, the only things I have added are a Marantz switcher and a Pioneer Blu-ray player.

Thanks!!!!

I have upgraded some of my power cords with Monster 200's. I got a great deal on them on sale for $19.99.

I see in the 990's manual it says not to use a 3 prong cord. Just wondering as to why.

Thanks.

You generally only want an audio system grounded in one spot. Having multiple grounds leads to ground loops and the resulting hum. Power amps are almost always grounded with a 3 prong plug, preamps are not.

Is the 990 really plugged into a switched outlet? I'd leave it in an outlet that was always on.

The 990 doesn't have a ground pin - if you look in the power socket on the rear of the unit, you'll only see two blades. Using a three-prong power cord wouldn't hurt anything, but it's not going to do anything either.

I have both of my preamps..my 990 and my integra 9.9, plugged into switched outlets on Adcom ACE 515 AC power conditioners/switches. I always put the preamps into standby mode with the remote before switching off the power completly to them.

Is there an advantage to leaving those preamps powered up on standby at all times rather then the way I have it?

Scott

How do you control the switching of those outlets? The advantage for me is that I don't have to get up, walk over to the system, open a cabinet door, and manually turn on the switched outlets on the power conditioner before I can hit the "ON" macro on my remote that turns on the pre-amp, TV, and cable box. The power amps are on switched outlets on the power conditioner that are then turned on automatically by the 12V trigger signal from the pre-amp. For that to all work, I need the pre-amp in standby.

So your 990 is alwasy in stand by?

The Monster 3500 has an outlet marked for a pre amp and it is switched. I do believe all the newer power conditioners use a marked outlet for pre amps and it is switched, the amp outlet is on a delay so it turns on after the pre.

It was when I had it in the system, and the Onkyo 885 that I've been using while testing the BDP-83 is the same way.
Is the outlet switched on/off? or is the outlet always on and the power conditioner monitors the current draw at that outlet so it knows to switch on other outlets when that one's connected device turns on? The latter case is not what I would call a switched outlet, because the outlet itself isn't being switched on and off.

If it's actually switched (such that the 990 is completely unpowered at times), how do you turn the 990's outlet on?

Question. When I turn on my 2 Monster 3500's, the amp stages and what I now get, never did before is a loud buzzing for a second or so out of what seems just the rear speakers.

I tried leaving the 990 off and doing this and it still makes the buzzing.

Ideas?