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Old 15th December 2015, 05:43 PM   #1
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Default NAD 304 - Hearing other inputs 'bleed' through

First Post!

I am currently using an older Nad 304 and have noticed a interesting problem. When I have my DAC (Schiit Modi 2) plugged into the CD input and it is playing music, I have noticed that I can faintly hear the music when I am using the other inputs. This is mostly clear when I have the volume fairly high and no signal playing on the other inputs.

Have you ever heard of this before? Any ideas? Or is this just normal?

Thanks for the help in advance!
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Old 15th December 2015, 05:52 PM   #2
Mooly is offline Mooly  United Kingdom
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It is I'm afraid 'normal' for this type of design (and its a very common problem across various brands), and caused by stray capacitive coupling both within the switches and also on the traces on the PCB.

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Old 15th December 2015, 06:09 PM   #3
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So is the best solution is to only ever have one source activly be playing at a time?

Also, I read somewhere about replacing the U shape clips that connect to pre amp to the amp. Is that a generally good upgrade to make? Seems pretty easy / cheap.
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Old 15th December 2015, 06:18 PM   #4
Mooly is offline Mooly  United Kingdom
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Only having one source playing is probably the only viable option. To get perfect isolation between inputs is a design exercise in itself and requires switches that not only simply connect the appropriate source through to the main amp but that also 'short' the other inputs removing audio from them before it enters the main PCB. That removes any crosstalk between inputs.

The U shaped shorting plugs will be as short as physically possible, and so your not going to improve on that, either electrically or sonically.

Sorry, that's probably not what you wanted to hear......
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Old 16th December 2015, 02:44 AM   #5
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While its not exactly what I wanted to hear, its not the worst thing. I at least don't have to spend time worrying about the NAD thinking that it is broken and needs to be fixed. I can simply enjoy it for what it is!

That leaves more time to research a new found interest of mine... building my first amplifier!
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Old 16th December 2015, 07:59 AM   #6
Mooly is offline Mooly  United Kingdom
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That sounds like a plan
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