DAC drops out when Furnace starts or stops. HELP

What are you using for a digital cable? Length?

Try a different digital cable.

Make sure it is at least a 1.5 meter long.
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The AE cable is only one meter while the GH cable is 1 1/2M.
Is it the length of the cable that could be the culprit or is it the design/construction differences?
10-09-15: Jadedavid

Hopefully someone like Al, (Almarg), will chime in.

As for the AC power side of the equation when the furnace or hot water is turning on or off a transient spike is being sent out on the AC mains. Just guessing the transient causes a quick brief problem with the DAC or maybe even the transport. For some reason the AE digital cable is not capable of maintaining a good digital lock between the transport and the DAC. It's like the AE digital cable was just on the edge of maintaining the digital lock between the transport and the DAC before the transient spike event would happen causing the drop out.

Either way, thanks for the suggestions to get the gremlins out. I will also look into the service panel today to check the wiring as to which leg of the mains might be in common.
10-09-15: Jadedavid

You never said if the furnace or hot water heater are gas or electric.
If electric my guess is they are fed by single phase 240Vac.

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Correction:

I said,

You never said if the furnace or hot water heater are gas or electric.
If electric my guess is they are fed by single phase 240Vac.
10-09-15: jea48

Every time my furnace or water heater (gas, power vented) kicks on or off my DAC drops out momentarily.
10-07-15: Jadedavid

Guess I missed that......
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I think it"s time to call in an electrician. Hopefully I can find one who understands this type of problem.

Your average electrician will not solve a ground loop problem.

Here is a white paper for you to read.

I have tried cheater plugs on some/all pieces of equipment, plugging all the audio gear into one strip, isolation transformers ETC ETC.

What equipment in your system uses the AC power mains safety equipment ground? (Check all audio equipment with an IEC power connector for the safety equipment ground pin/blade. If only 2 blades the equipment ground is not used on the equipment.)

Are you sure you are hearing a hum or could it be a low level buzz?

It would help if you listed your equipment, ICs, speaker cables, and any after market power cords you are using.

By chance do you have a TV with CATV or a Dish connected to the system?
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Douglas_schroeder,

I use a 2 meter digital coax cable myself. I don't think anyone here said a 1.5M was the magic length.

I think Al, (Almarg), and Kijanki offered a more technical reasoning why the digital cable made the difference and the fact that Jadedavid solved his dropout problem using a different digital cable tells others that are experiencing dropouts caused by the switching on or off of an AC mains load/s it might save them a lot of time to just change out the digital cable instead of spending maybe hours looking for an AC mains problem that may not be their problem at all. It might just be the digital cable. In the end that's all that matters.
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Follow up to this thread.

I later contacted the OP, through the Agon message system, with a question about the problem he had with drop outs. I asked him if he was still using the same 1.5M Grover Huffman digital cable. He responded no he had bought a new 1M Grover Huffman digital cable and was not experiencing any drop out problems with the 1M Grover Huffman cable.

Conclusion? Not all S/PDIF 75 ohm digital coaxial cables are created equal.
Was it the RCA connectors used? Do the ends used by Grover Huffman have a closer better 75 ohm characteristic than the ones used by Audio Envy?

Was it how the RCA connectors were connected to the coax cable?

Was it the 75 ohm coax cable Audio Envy used?

Or was it ???