NAD S170iAV owner manual SETTING UP THE S170i, Getting Started, Dealing With Hum And Noise

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SETTING UP THE S170i

GETTING STARTED

Before you make the first connection to your S170i, you should have the arrangement of your listening room/home theater components and furniture mapped out, at least initially. Unfortunately, a discussion of the vital questions of loudspeaker placement and listening/viewing positions is beyond our scope here. Suffice it to say that these two questions will influence your system’s ultimate performance every bit as powerfully as your selection of electronics and speakers. Your NAD audio specialist dealer will be happy to advise you, and to recommend reference materials.

DEALING WITH HUM AND NOISE

The S170i requires a grounded (3-prong) AC outlet. Employing a 3-to-2 adapter to eliminate the ground prong will not compromise electrical safety, but it may increase susceptibility to hum and noise. Hum and noise sometimes prove a challenge in complex, multichannel audio systems. Note these considerations to help prevent hum and noise problems:

•Power all your system’s audio component from AC outlets originating from the same circuit of your house wiring. As far as possible, power all audio components from the same outlet, or adjacent outlets on the same circuit. It may be useful to power video displays (and computers!) from outlets on another circuit, especially if that circuit is supplied from the other “leg” of the house wiring.

•Do not bundle analog audio cables with AC power cables, or with coaxial digital-audio cables.

•Employ high-quality, well-shielded audio cable throughout, and ensure that all connections are secure.

•A pencil-eraser can be used to burnish copper- and gold-plated contacts to ensure good, low- resistance contact; specialized contact-cleaners can also be useful. Avoid unnecessary unplugging and re-plugging, since the gold (or copper) contact-plating of typical cable connectors, even very high- quality ones, is very thin and easily worn.

Track down hum/noise problems one component at a time, working backwards from the power amplifier(s). That is: Connect the speakers to the power amplifier only, and check for hum. Then connect the preamplifier alone (with no other components connected to the preamp) to the power and check for hum. Then connect one source component (a CD player, for example) to the preamplifier, and check for hum. At each stage, if hum/noise appears, examine the audio cabling and AC-power routing of the new component. In some cases, moving the new component’s AC cord to a different outlet, or installing a ground-lift (3-to-2-prong adapter) on its power cord, will eliminate the hum.

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