AudioQuest Niagara 7000EU Panduan Pemilik - Halaman 16

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might find that the unit sounds substantially better in the "Engaged" position. If this is the case, it is possible

that the main or primary power amplifier is not plugged into High-Current AC bank 1, the power amplifier has

insufficient current draw to activate the circuit, or the circuit is miscalibrated.

When the Power Correction switch is set to the "Engaged" position, the current sense circuit will be defeated. Yet,

even with the current sense circuit functioning properly, audiophiles may prefer the "Engaged" position, as it will

slightly decrease the impedance of the Transient Power Correction Circuit.

My Niagara 7000EU has no power amplifiers connected to it, but it sounds odd or

not quite as good as it once did.

The Transient Power Correction Circuit also aids the Ultra-Linear Noise-Dissipation Circuits. Make certain that

the rear-panel Power Correction switch is in the "Engaged" position.

A technician or electrician found that my Niagara 7000EU consumes over 8 amps

of current. Is it broken?

No, it's not broken, and it's not drawing 8+ amps in any conventional sense. The Niagara 7000EU's Transient

Power Correction Circuit creates a reactive current draw of as much as 9 to 10 amps RMS at idle, and, when

incorporated with power supplies such as those found in power amplifiers, the current readings decrease. This

is a vector load, which will vary with the connected equipment. When plugged into an AC service that has no

other electrical draw, it is typical to see a real-world RMS power draw well below 15 watts at idle. (For an in-

depth explanation of the circuit, see "Power Correction Switch.")

I did not notice hum with any prior power device, but there is a hum in my system

with the Niagara 7000EU.

Typically, this will not occur. In fact, the Niagara 7000EU's two Ultra-Linear Dielectric-Biased Symmetrical Power

outlet groups are 100% isolated from one another, 100% isolated from the High Current/Power Correction outlet

group, and floating. This allows opportunities to break up ground loops in an audio system. However, the hum

created by ground loops (typically, a voltage differential from Neutral to Ground among two or more signal-

connected devices in an audio/video system) can at times be quite complex and difficult to easily diagnose.

To diagnose the hum/ground loop: With everything else unplugged, start with the simplest system that can still

play music through your loudspeakers. Use a source such as a universal player, computer, or a turntable so there

is no external cable or satellite cable connected to ANY of the associated components. Is there any hum? If yes,

and there is more than one line-level (non-power amplifier) component connected in this "minimalist" test, try

placing one in Symmetrical Power group one and the other in group two.

If the hum no longer persists under these conditions (which is likely), try reconnecting each additional component

into the Niagara 7000EU one at a time. Once you find the component that creates the hum, you can possibly

achieve increased isolation by connecting it to a different Ultra-Linear/Symmetrical Power outlet group. This

can typically help, as well as increase overall system performance by decreasing system noise. If adding a cable

or satellite signal to the system reintroduces the ground-loop hum, that incoming signal line may require an

isolation transformer or humbucker.

If it seems that hum didn't occur before, but does now, it's most likely that the hum was in fact always there. The

difference is simply a matter of degree. Sometimes the ground loop difference is right on the edge of breaking

into an area where it's audible, instead of only measureable with electronic measurement instruments. The

very act of creating better connections, thus minimizing the impedance to the power amplifiers, can tip the

scales. If the hum/ground-loop exists on the incoming satellite or cable line, then it will be necessary to fix the

real problem. This is common with large custom install systems. As these signal lines are always grounded in a

different place and at a different potential than the rest of the system's ground return, the system will benefit

greatly by utilizing isolation under these conditions.