AudioQuest Niagara 3000EU Руководство пользователя - Страница 14

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Note: A pipe cleaner or cleaning swab with a wood stick and compact wool tip (available from an electronics

supply house) will be superior to household swabs. When working in a small area such as an AC outlet, this is

critical. Loose strands of cotton may damage the AC outlet. Damage to an AC inlet or outlet due to cleaning is

not covered under your warranty. If you damage an inlet or outlet in an attempt to clean it, you will be charged

for the repair and you will be responsible for all shipping costs.

I hear a slight buzzing sound coming from the Niagara 3000EU. Is it damaged?

No, it's not damaged (or, at least, damage is very unlikely). If you're in an extraordinarily quiet room and you hear

this buzzing sound only when in relatively close proximity to the Niagara 3000EU, or only when you place your

ear next to the unit, the buzzing is normal and, unfortunately, cannot be entirely eliminated.

What you are experiencing is a variation on the effect called magnetostriction. When an extraordinarily high

quantity of harmonic distortion is present on an AC line, a portion of the Transient Power Correction circuit that

is hermetically sealed and damped can mechanically buzz as its internal electrical plates resonate at 60 Hertz

and many octaves above. In order to reduce or eliminate this harmonic distortion, the circuit is trying to turn this

distortion into heat. This has no effect on the performance or longevity of the Niagara 3000EU or its connected

components.

Well over ninety-nine percent of installations will never exhibit this problem, but that's no comfort to the 1%

that do. Unfortunately, when this is very audible and present from across the listening room, it is typically due

to a poorly performing electrical transformer supplied from the power utility, or, sometimes, a chopped AC

waveform of an old or poorly functioning lighting dimmer system. The transformer may be saturating or in need

of replacement, and older dimmer systems may need updating (if this is at all possible).

Occasionally, this may also be triggered by other large electrical appliances whose power supplies are

severely asymmetrical. Try turning on the Niagara 3000EU with an AC outlet that is on a different phase from

the electrical panel. This may require some experimentation and the help of an electrician. If this cannot be

remedied, simply place the rear-panel switch to the "0" position. Only a portion of the Transient Power Correction

will be disabled, and 90% of the unit's performance will remain intact (but the annoying buzz will be gone).