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Buzz between Marantz SR5008 and Mcintosh C2300

I've got a HT and 2 channel setup I'm trying to marry for use of FL and FR speakers on both.

2 Channel - Computer Channel D/Pure Music to PS Audio Perfect Wave MKII to McIntosh C2300 to Sanders Magtech 2 channel to Snell AIII's.

HT - HD cable/BlueRay/Apple TV/Webcast to SR5008. RR, LR, Cntr and Sub speakers (all Snells) out from the SR5008. FR and FL are Pre-Out (RCA) from SR5008 to C2300 Passthrough designated input. C2300 power triggered from SR5008 to engage Passthrough. FR and FL from C2300 to Sanders.

All are powered through dedicated 20amp line and then through a Furman Elite 20 conditioner.

AND, the problem is a low volume buzz in the sparkers - all channels. I've plugged and unplugged everything, plugged every configuration on the Furman and the only remedy is to take the C2300 out of the chain. No buzz SR5008 to the Sanders. No buzz in the 2 channel set up.

Thoughts? Is the SR5008 pre out to the C2300 just never gonna work? Just to much difference in the equipment configurations? Seems to me this how the C2300 Passthrough should work. Yes?

Or is this just the excuse I need to upgrade the low-end processor? :)

Thanks to all.
Tccaux
tccaux
tccaux OP
36 posts
 
I removed the cheater from the C2300 but left on the PS DAC and the buzz came back. I put the cheater back on the C2300 and, upon really close listening, it's apparent that the buzz doesn't entirely go away. It just gets barely audible.

Traveling again this week so will wait until I'm home and have time to pull things out and try the cheater on other units in the chain. For the moment, it's just nice to be listen to HT without a noticeable buzz.

Its a satellite cable btw. The ground is connected to the satellite chassis mounted on the roof. The other end is connected to gang box connected to the house ground.

Thanks
jea48
4,451 posts
 
Its a satellite cable btw. The ground is connected to the satellite chassis mounted on the roof. The other end is connected to gang box connected to the house ground.
03-25-14: Tccaux

Well that does make a difference. For one the Jensen ground loop isolator will not work on a satellite system.

"The other end is connected to gang box connected to the house ground."

Gang box??? Connected to the house ground? Do you know where the connection is made?

Quote from link provided below.
Grounding the lead-in antenna cables and the mast help prevent voltage surges caused by static discharge or nearby lightning strikes from reaching the center conductor of the lead-in coaxial cable. Because the satellite dish sits outdoors, wind creates a static charge on the antenna as well as on the cable attached to it. This charge can build up on both the antenna and the cable until it jumps across an air space, often passing through the electronics inside the low-noise block down converter feed horn (LNBF) or receiver. Connecting the coaxial cable and dish to the building grounding electrode system (grounding) helps to dissipate this static charge.

Although nothing can prevent damage from a direct lightning strike, grounding with proper surge protection can help reduce damage to the satellite dish and other equipment from nearby lightning strikes.

The grounding electrode conductor must terminate in accordance with (1), (2), or (3).

(1) Buildings or Structures With an Intersystem Bonding Termination. The grounding conductor for the antenna mast and antenna discharge unit must terminate to the intersystem bonding terminal [Art. 100 and 250.94], as shown in Fig. 1. Bonding all systems to the intersystem bonding termination helps reduce induced potential (voltage) differences between the power and the radio and television systems during lightning events.

(2) In Buildings or Structures Without Intersystem Bonding Termination. The grounding conductor for the antenna mast and antenna discharge unit must terminate to the nearest accessible location on the following:

• Building or structure grounding electrode system [250.50].

• Interior metal water piping system, within 5 ft from its point of entrance [250.52(A)(1)].

• Accessible means external to the building, as covered in 250.94.

• Metallic service raceway.

• Service equipment enclosure.

• Grounding electrode conductor or the grounding electrode conductor metal enclosure.
http://ecmweb.com/qampa/code-quandaries-7

http://ecmweb.com/qampa/code-quandaries-7
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tccaux OP
36 posts
 
All interesting but am I correct to assume that since the buzz did not go away with the cable/satellite coax disconnected at the wall that it's been eliminated as a source of the buzz? And that the process of elimination will be using cheaters on each piece of gear connected to the Furman?

Thanks for the continued feedback!
rbautista
97 posts
 
See if this will work for you. I skimmed so you may have tried something like this. I did the same as you where I disconnected the coax and still had the buzz. The buzz is coming from the cable box.

http://forum.audiogon.com/cgi-bin/fr.pl?bhome&1333386303
kalbi23
58 posts
 
I had the same issue with my MC205 and Marantz AV7701. I spoke with Oppo, Mcintosh and Furman, after all the tests they had me go through, they all came to the conclusion it was the Marantz. I swapped out the AV7701 for the AV8801 for testing purpose and there was no buzz. I called Marantz, and explained the issue, they told me the reason it doesnt buzz with the AV8801 is better shielding and its built better lol. So i swapped out the Marantz and got a Yamaha CXA5000. I would try to get a cheap AVR from a local store that has a friendly return policy and see if it really is the Marantz. BTW, i went through three different AV7701 and all the same issue, and i also have the Furman elite 20.
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