Marantz AV7005 - Page 297

I hate buzzing problems it seems its always a wild goose chase trying to isolate them.

The speakers + amps have too high a gain for Audyssey to work well with this pre/pro. One option is to put attenuators in all of the speaker channels.

The Onkyo 886 had Audessy as well. I had ran it and as stated above, no problems....

I retried using unbalanced cables today and it did not help. The buzz was still there.

I can try a different set of speakers tomorrow, Klipsch Kg4, and see if that changes anything. Tomorrow I am also going to try a Marantz SR7005 both with and without my amp.

These ones? Still might have the problem: they have horns and are also really efficient/sensitive:

http://www.klipsch.com/kg-4

Yup, those are them.

I tried a different 3 prong cable to the TV today and it did not help.

If I wanted to try a different way to ground the tV, what are some suggestions?

In my case I used a three prong to two prong adapter (AKA cheater plug) to confirm that lifting the ground on the TV eliminated the hum. It did, but leaving it in place creates an unsafe configuration (TV ungrounded). I then replaced the adapter with the Hum-X ground lift which places a slight resistance in the ground connection. That resistance is sufficient to eliminate the hum, but not make the TV ungrounded.

I did try a cheater plug at the TV and it did remove most of the hum. I then used another on my amp (high powered; Outkaw 7700 which is a 200 wpc, 7 channels) and the buzz did go away. The Hum X is only rated for 720 watts I believe, which should be fine for my plasma as it is rated at 724 watts MAX, but that would not work on my amp.

I also have an Outlaw amp (7500)...I also, have a slight hum at CERTAIN TIMES, i.e, no predictive pattern; after this first happened years ago (and exhaustive investigation)...was advised that it was basically due to "dirty power" from my electrical provider. The hum (when it does happen) is usually during peak power demand (supper time) and may last a few seconds or at the most, a few minutes. It is not loud (I can only hear it when dead silent in listening room)...I do not use any power conditioning or cheater plug, etc. (just high quality surge protection).... thought I would share that with you.

A couple of thoughts.

One thing I found with my system was that the device that was the source of the hum changed with a change to the system configuration. So while initially it was the TV, it is now the sub. You might consider setting your system up (including interconnects) the way you expect it to stay for awhile as you work the hum issue.

I'm not an expert in this, but I think an isolation transformer can help with hum originating on the AC connection of high current devices like your amp.

Almost every interconnect type used in these system (except HDMI) has a hum eliminator device available for it. So you can work the problem from the interconnect side if necessary.

have a brand-new, never-opened, AV7005 if anyone's interested.............

maybe pm me

Not sure if anyone asked this or not -

Is the Direct TV dish properly grounded?

I had some ground loop problems with a 7005, ultimately went through every wire termination in my house - I was able to reduce the ground loop. I got a RMA for a new 7005 and for the last 11 months been noise free.

FOOD for thought.

There was no noise or buzz with my Onkyo 886, no noise in another system set up wth my Klipsch Kg4 speakers with a DirecTv DVR, so I am sure the sat system is grounded. I have visually looked at it and it seems fine.

I got a Hum X and connected the Plasma to it. With the HDMI cable connected at the 7005 to the TV, and multiple HDMI cables connected to the 7005 except the DVR, no noise!

Connect the DVR via HDMI and the noise returns.

Connect the DVR via component video cables and the buzz is still there.

Tomorrow I am going to swap DVR. The one in th eroom now has a 3 prong plug, but I have a H22-100 (I think) in another room that is only a 2 pronger.

Is the Direct TV dish properly grounded? was asked above....

Bingo ! Seems like many of these hum discussions trace back to a poorly grounded Sat.

Very interesting. My AV7005 bought in late 2010 has been connected to a Panamax M5400-PM and an Anthem MCA50 via cheap XLRs from Markertek with no hum at all. I do have DirecTV as well.

As also stated above, I believe the sat system is grounded. Other systems are fine, and this system was fine until the swap of my Onkyo 886 and this Marantz 7005.

If there is a way to check to be sure the sat system is grounded I am all ears (or eyes). Most searching of poorly grounded systems I have found have been for cable, not sta, but ya never know. I am trying all sorts of things.....

Many years ago I installed sat systems (GIANT DISHES) while working for an audio video dealer and also worked for a local cable company, installing/servicing. I've seen some shabby work when it comes to grounding equipment. Typically a system would be grounded to a metal water pipe close to where the pipe enters the home. Many times I've seen ground connections on hot water pipes and metal pipes that had no visual path back to earth ground. These almost always cause problems. When a good ground is not found in a house (via water pipe) the best way is to use a grounding rod, outside next to the foundation, driving it fully (minimum 6 foot) into the soil and attaching a grounding clamp and heavy gauge (12ga minimum) ground wire. This insures that the equipment is safely grounded. It does not however insure that there will be no ground issues because the ground potential of your other equipment in the house may be slightly different. This causes 60Hz currents to flow and ultimately hum and buzz issues. The best scenario is when all the equipment is tied to the same ground using a single wire in "star" fashion. Grounds should not be cascaded (from one piece of equipment to another. These problems can make you pull your hair out. I would suggest checking both the house electrical ground and the sat system ground for starters. Another possibility is that the AV7005 may have a problem. Good luck

Any suggestions on getting the AV7005 to play flac files?

I recently purchased a slightly used AV7005, and I'm very pleased with the unit's features and sound quality for the price. (Thankfully, no hum in my system.) However, I've been unable to play flac files streamed from my PC using the "net" input on the AV7005. It plays AAC and mp3 files just fine but fails to see the flac files, which in this case are the Beatles catalog in 24 bit/44.1k resolution sourced from their USB Apple. (I haven't tried plugging the USB stick directly into unit yet, as its "stem" is delicate.) The folder containing the flac files is designated as a shared folder on my PC. My Squeezebox touch plays them with no problem. I have the Marantz attached to my network using a Netgear wireless extender with an ethernet cable between the extender and the AV7005. Other than playing flac files, every other network feature (i.e. Airplay, internet radio, PC control mode) works great with this arrangement. Do I need to download a media server other than Windows Media Player to play flac files through the AV7005?

There should be no issue when playing 2CH flac files.

I do have a grounding rod outside the home, near the panel. I also have the sat system (wires) grounded to a cold water pipe, very near where the sat wires enter the home, which is in the same area of the home (within 10 feet of the main panel) in the basement.

My AV7005 no longer maintains a handshake through its HDMI outputs. Sucks. I get the audio portion no problem, but it will not pass the video signal.

When this first occurrence happened, I unplugged everything performed a factory reset plugged everything back in and - it still didn't work. Then the next day after futzing around with it started working again. I cleaned everything, every connection and reinstalled. It worked for 2 days. Now it has lost its video again.

Any suggestions?

Can't really say whether this will be your issue, but per this part of the thread I had problems streaming FLAC which turned out to require an update to my NAS drive streaming software.

Dave

Those 2 grounds are not the same ground. You can have a voltage potential between the two, and that creates a ground loop.

This is why most Sat/cable installers are lazy. They don't tie into the true house ground, they create they're own. And that can create problems.

Question. Literally since yesterday there is small Speaker Buzz/ White Noise coming out of my speakers. It disappears when I mute the Marantz. It also disappears when I turn of my projector (connected to the Marantz). How come this suddenly started happening? Any thoughts on how to fix this and why this suddenly started happening?

Has anything changed in your setup recently? Can it be identified to a specific source possibly or is it just from the PJ? Try connecting the PJ to the unit with another HDMI cable.

It's weird. When I turn the projector off, the white noise disappears, but when I unhook the HDMI projector cable from the Marantz, the white noise is still there. Since both the Marantz and the Projector are using the same Monster surge protector, maybe the issue is somehow an electricity ground loop?

I have an electrician coming out today to look at running a couple new individual circuits to the amp, TV, sub, etc, to supplement the one circuit I have for those items now. I will have him check my grounding situation while he is there.

Was wondering what a new FW update was for that flashed on the receiver today...

http://us.marantz.com/us/News/Pages/NewsDetails.aspx?NewsID=77

Oh my all the new toys. AV8801, AV7701 and the MM8077.

However I only got my AV7005 and the MM7055 back in April so newer is cool, but I think I'm holding for now.

Don't forget that they all need to come off the same incoming power phase, otherwise you will be introducing hum. (Most homes in the U.S. are supplied from two of the power company's three power phases.)

My two dedicated circuits are not from the same leg and there is no hum. Used a shared neutral circuit for efficient use of wire and reduced voltage drop.