Marantz AV7005 - Page 95

Thanks for the reply.

I get get to the back of it and I have tried unplugging everything and and I have each outlet dedicated to a 20 amp breaker. When I had the 885 I had it and sources on one outlet and the amps on the other and never had and issue and it was quiet. I will try you suggestion about the analog inputs selection but so far it has the same tone on any input and volume. It does go away on mute but I'm not surprised.

I gave away my headphones.

I just dragged my wife down to see if I'm being crazy. She said "well I can hear something but, if you are watching a movie you won't hear it". She thinks I'm hearing it because I'm really listening for it.

Have you tried grounding the AV7005. I notice it doesn't come with a grounded cord, just a two wire.

I agree that grounding may be the problem. But maybe different from what worked for you.

I recently replaced my Proceed AVP pre/pro and Adcom GFA-6000 power amp with a new Marantz AV7005 & new Adcom GFA-7605. Suddenly I was hearing hum that I never heard before. In my case, it turned out to be ground loop from the cable TV. Lifting that ground with a $9 ground breaker solved my problem. Why my prior equipment didn't hum, and why my new equipment did? No idea.

This is easy to test. If the hum goes away when you unplug your TV cable, that's the culprit. Otherwise, you're in for more troubleshooting.

How would one do this? It is in a rack so should I ground the rack and if so how?

I don't have cable I have directv. I did unplug my swim switch but that did not help.

If it goes away with Mute, and you already tried playing with all input sources disconnected, the noise is either being generated internally or being induced from something nearby, like a switching supply in some innocent device like a cordless phone or who knows what.

The only way to confirm is to disconnect the power cords of every other device within 10', or place the AV7005 in an empty room except for you and a speaker. If it still hums, it pretty much points to the innards.

If when you disconnect everything (except the amp and speakers) the problem is gone, that proves it is a connection issue, not the AV7005. Then add each device, one by one, and check each input's sound once connected. That will tell us which connection is the issue.


That's not generally a good idea if you are having noise/ground issues. The entire system should feed from one outlet with a large power strip (use a cheap one initially for diagnostic purposes). This may be hard to do with a distant sub and distant video display so leave them disconnected and unplugged for now.

Although many of the suggestions re grounding and isolation transformers may work, you don't want to start haphazardly applying bandaids all over the place until the problem is gone; you want to isolate and determine the exact cause first.

I have no sources plugged into the 7005.
With the volume at 0 and the amps on there is a buzz.
If I mute the 7005 the sound goes away.
If I leave the amps powered and shut off the 7005 the sound goes away.
If I use XLR cables the amp is much quieter than with RCA's with just the amp powered and the 7005 muted or powered off.
At any time with just the 7005/amp/speakers powered it will make the buz.
I have hooked the amps to the other zones and they buzz.
I have used one outlet on a long breaker for all of these tests.

I also repeated these same tests using an long extension cord run upstairs to another outlet with the exact same results.



When I wired the theater I had consulted the company that I purchased my amps (ATI) and this was their suggestion. I've had this setup for over 5 years with no issues until now.

I agree with finding the real issue which is why I have been trying to be as methodical as possible.

Thanks again for your help.

Anyone know why the volume adjustment does not display when video processing is turned off in the AV7005? This is really annoying to me as I have no use for the video processor.

Thanks.

anyone?

I take it you mean when you have the unit in "Pure Direct" mode you don't like that the volume display on the front panel round window turns off, yes? I may have a work around if so.

Please describe your system in more detail. Do you not own any video devices, only audio? Do you do video switching in some other device? Please elaborate.

The avr requires the video convert feature to be on in order to render any of it's gui or on screen displays. The video convert feature does a straight pass through unless you have ip scaler set to perform any scaling..

Interesting. I had mine setup just like that. Video convert on and i/p scarler off. However, I constantly have video issues while watching live basketball. My only solution was to turn video convert completely off.

I was referring to the volume readout on the TV screen. Sorry.

What type of issues?

I see, pjonkheer. Then mariob33's advice applies. Also keep in mind I think you have to set this feature to "video conversion on" per input for the ones you want to see the overlayed volume display on. [it is not global, that is] (I/P scaling is just an option, you don't need to turn that part on for volume overlay OSD to work, as I think you already realize.)

Did anyone of compare the AV-7005 with the Rotel RSP-985. I really like the DTS mode of the Rotel, but find the Dolby Digital and stereo lacking in transparance and clarity.

I'm wondering if the AV-7005 would give a jump on sound quality on these areas, and be at least as good with DTS, and possibly better with the HD channels).

and now i've learned something new two days in a row...

thanks mz... that IS interesting...

Another thing to check out is the presence of fluorescent or CFL bulbs in the vicinity. A long shot, but worth thinking about.

Just wanted to share my remote was being very difficult I did have a flourecent light near the av-7005 so I moved it and whatta ya know no problems now works great from all angles etc. So I geuss it really is sensitive to the light. Thanks Jim

Thanks Deane.

I did turn off all the other gear in the vicinity and it did not change. There is a CFL bulb in the room with the rack. I'm sure it was off during some of my testing so I don't think that is the issue but good check.

I'm going to try and get a friend over to help me pull the pre and one of the amps out of the rack to try somewhere else.

Jittery video. Almost like missed frames or freezing. Audio doesn't miss a beat.

The Airplay add-on is suposed to be live for purchase as of today. I have not as of yet. Maybe later this afternoon when i have a little time. Just passing it along

http://www.engadget.com/2011/01/06/d...leased-for-49/

I did not do a Rotel vs Marantz comparison. I went from a B&K AVR 507 to AV7005 (powered by Emotiva UPA-7). The Rotels I have listened to are very musical and their processors (DD/DTS) sounded good. In terms of quality, I think a comparison to the B&K is appros pro. I can tell you that the formats I have tested (albeit briefly, as I only installed everything on Sunday and have not run Audyssey), have a noticeable improvement in the sound, particularly with the HD audio codecs. I have not tested a non-bluray disc yet. Part of the reason for the upgrade was to obtain the latest and greatest sound that is offerred. I listened to a lot of music in 2 channel direct/pure direct on the B&K. The soundstage was fantastic and the music very transparent. I find the same w/the Marantz, though my sub is not engaged in pure direct, so I listened in stereo as well. I have to spend more time comparing sound in direct vs stereo and use a variety of material to form a better opinion, but I can tell you I liked what I heard. I actually listened to a couple of tracks in DPLiix and was surprised at how much I enjoyed the sound. To audiophiles that is blasphemy, but my ears liked it. Lastly, what is very important to me is that I am not disappointed, and I know I did not "step down". That is frequently a worry when changing equipment. If you have read through this thread then you will see similar opinions expressed. Ultimately, yours is the only one that counts so you should go take a listen at a dealer. I know the Anthem's line of new receivers have been getting great reviews as well from AVS members.

Do you have a spare XLR cable, or care to modify one of yours?

If so, at the end that connects to the amp, take apart the connector and desolder (or cut) the wire connected to Pin 1 and insulate tag end of the wire so it can't touch anything else. Now, try it with just that one channel connected and see if you get the hum/buzz from that channel.

I don't have a spare one and the ones I have are too nice to cut up.

I've got to do and order from Monoprice so maybe I'll get a cheap one to try. What is the theory behind this?

Thanks.

Breaks the ground between amp and preamp. In an XLR cable the ground is not necessary to convey the signal. This is what I did to fix the ground loop hum/buzz that occured with my AV7005. Ii's often referred to as "lifting the ground (or sometimes shield)".

If you have a music store (or maybe even Rat Shack) not far away you could buy one for a test, although you'll have to pay a bit more. Mine are homemade so it was just a matter of unsoldering the ground/shield, folding back the wire, and taping it to the jacket where it remains hidden inside the back shell.

I have noticed this problem too...sometimes the volume does not show up on the OSD. I haven't played with it enough to know the pattern. I just switch inputs, then switch back and it works. Or pull up the menu, then close it out.

If you are using a cable and certain sat boxes there has been a long standing bug in the osd overlay disappearing and requiring a jolt when the Rez of the feed goes from say 480i/p to 720p or even 1080i I believe. The workaround suggested in the denon threads has been to set sat/cable box to output at a set Rez of 1080i. I am surmising as the video section of this unit is identical to the denon models you are experiencing the same issue. Try searching OSD in one of the Denon threads and you will find tons of reference to this.

Thanks...My cable box is set at 1080i. When you suggest this, do you have pre/pro (AV7005 in this case) video convert/scaler on or off?