AudioQuest Niagara 7000EU Manual del usuario - Página 18

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Ninety-eight percent of installations never exhibit this problem, but that's no help to the 2% that do. The Niagara

7000EU features a very robust DC-blocking circuit that feeds the input or primary to each of the AC isolation

transformers, but there are times when otherwise fabulous audio/video component or computer products can

nevertheless backwash DC (or a severely asymmetrical chopped waveform) into the output secondary of the

transformers. When this occurs, it is necessary to perform some experimentation: Remove each component and

its AC cord, one at a time, from the Ultra-Linear Dielectric-Biased Symmetrical Power outlets - groups two and

three. (The High Current/Power Correction Outlets are in no way connected to these transformers, so these may

stay as they are.)

Once magnetostriction is present on a transformer core, the audible noise (saturation) becomes greater as the

transformer is asked to pass more current. Moving some products, or a moderately high-current product, to

the opposite transformer group may alleviate the problem. Additionally, many computer drives come with

external (wall-wart type), switching power supplies that feature chopped AC waveforms. If mechanical noise is

present, such power supplies may be better served by the Niagara 7000EU's High Current outlets or by using an

additional, smaller Niagara Series product, such as the Niagara 5000EU or Niagara 3000EU, which do not employ

transformers.

If you notice that the slight buzzing sound has increased over time (i.e., was once negligible, but is now quite

noticeable), please understand that the Niagara 7000EU's AC isolation transformers are like the proverbial

"canary in a coal mine." In all likelihood, the Niagara 7000EU has not developed a problem. (If you remove all of

the AC output cords and listen for the slight buzzing sounds, you will likely find that they are gone.) However, it

is possible that otherwise state-of-the-art components are causing the problem.

Investigate valve or vacuum tube power supplies. If the tube(s) are wearing, some circuits will offset some DC

onto the AC line and back to the Niagara 7000EU, or affect the AC waveform that the Niagara 7000EU feeds. If

the components were going into a power filter or conditioner without transformers, you would never be aware

of the problem, but transformers never lie: It's time to replace one (or more) of the power supply tubes!