AudioQuest Niagara 5000EU User manual

Owner’s Manual
Niagara 5000EU
Low-Z Power
|
Noise-Dissipation System

2
EN
Instructions in English are available at the link below.
ES
Las instrucciones de instalación en el español se encuentran disponibles en el enlace que
se indica a continuación.
FR
Les instructions d’installation en français sont disponibles au lien suivant.
ZH
安裝說明請詳見下列網址連結.
JA
日本語 のインストールガイドは下記リンク先でご覧いただけます。
www.audioquest.com/Niagara5000/manual

3
Niagara 5000 Features 4
Introduction 4
Installation 6
Unpacking 6
Safety Information/Warnings 6
Servicing/Return to AudioQuest 6
Power Source 6
Placement 7
Connection to Audio/Video Components 7
AC Cable Routing 7
High Current/Low-Z Power Banks 8
Ultra-Linear Noise-Dissipation System Power Banks 8
Suggested AC Connections 10
Operation and Continuous Use 12
Power Switch/Circuit Breaker and LED Power Indicator 12
Rear-Panel Power Correction Switch/Niagara 5000 Current Draw 12
Extreme Voltage Indicator 13
Break-in Time/Continuous Use 13
Specications 14
Trouble-Shooting Guide 15
Warranty 18

4
Niagara 5000EU Features
¡¡Transient Power Correction: Provides over 80 amps peak instantaneous current reservoir with
reduced line impedance for current-starved power ampliers, whether they incorporate linear or
switching power supplies.
¡¡Ground Noise-Dissipation System: AQ’s patented technology vastly reduces ground-borne
noise without compromising safety or creating low-level ground loops.
¡¡Ultra-Linear Noise-Dissipation Technology: Ensures the most consistent and widest bandwidth
noise dissipation possible, without the inconsistent results that typify minimalist, multi-node
resonant peaking found in many AC power conditioners.
¡¡Ultra Low-Z NRG Series AC Power Inlets and Outlets: These inlets and outlets not only feature
a grip with far lower resistance (utilizing far more mass than conventional or audiophile-grade
designs), but they also include a heavy Hanging-Silver plating to ensure the lowest impedance at
radio frequencies, enabling superior noise dissipation.
Introduction
The science of AC power is not a simple one; it demands focus, and the devil is in the details. In fact, the
mammoth increase in airborne and AC-line-transmitted radio signals, combined with overtaxed utility lines
and the ever-increasing demands from high-denition audio/video components, has rendered our utilities’ AC
power an antiquated technology.
Where Alternating Current (AC) is concerned, we’re relying on a century-old technology created for incandescent
lights and electric motors—technology that was certainly never meant to power the sophisticated analog and
digital circuits used in premium audio/video systems. To properly accommodate the promise of today’s ever
increasing bandwidth and dynamic range, we must achieve extraordinarily low noise across a wide range of
frequencies.
Further, today’s power ampliers are being taxed for instantaneous peak-current demand, even when they’re
driven at modest volumes. Although we have seen a substantial increase in both dynamics and bass content
from our audio software, the loudspeakers we employ to reproduce them are no more ecient than they were
two to four decades ago. This places great demands on an amplier’s power supply, as well as the source AC
power supplying it.
Our systems’ sensitive components need better alternating current—a fact that has resulted in a host of AC power
conditioning, isolation transformers, regeneration amplifiers, and battery back-up system topologies. Through
differential sample tests and spectrum analysis, it can be proven that up to a third of a high-resolution (low-level)
audio signal can be lost, masked, or highly distorted by the vast levels of noise riding along the AC power lines
that feed our components. This noise couples into the signal circuitry as current noise and through AC ground,
permanently distorting and/or masking the source signal.
All sincere attempts to solve this problem must be applauded since once the audio/video signal is gone, it’s gone
forever…
For AudioQuest, honoring the source is never a matter of simply using premium “audiophile-grade parts” or relying
on a proprietary technology—common approaches used within the audiophile market. For years, we have all been
witness to the same, seemingly endless audiophile debates: Valves versus transistors. Analog versus digital. Can cables
really make a dierence? The debates go on and on. While we, too, can brag about our many unique technologies, we
realize that true audio/video optimization is never a matter of any one secret or exotic circuit. When it comes to noise
dissipation for AC power, many approaches can yield meaningful results. However, they may also impart ringing,
current compression, and non-linear distortions that are worse than the disease. The Niagara 5000EU uses both our
patented AC Ground Noise-Dissipation System and the widest bandwidth-linearized noise-dissipation circuit in the

5
industry. Our unique passive/active Transient Power Correction Circuit features an instantaneous current reservoir
of over 80 amps peak, specically designed for modern current-starved power ampliers. Most AC power products
featuring“high-current outlets”merely minimize current compression; the Niagara 5000EU corrects it.
Though it’s easy to boast, it’s quite another thing to create a solution that is consistent, holistic, functional, and that
honors veriable science. It’s not enough to reduce AC line noise and its associated distortions at just one octave,
thus leaving vulnerable the adjacent octaves and octave partials to noise, resonant peaking, or insucient noise
reduction. Consistency is key. We should never accept superior resolution in one octave, only to suer from masking
eects a half-octave away and ringing artifacts two octaves from there.This is the principal criterion for AudioQuest’s
Low-Z Power Noise-Dissipation System.
The Niagara 5000EU represents over 20 years of exhaustive research and proven AC power products designed
for audiophiles, broadcast engineers, and professional-audio applications. Every conceivable detail has been
addressed: In the Niagara 5000EU, you’ll nd optimized radio-frequency lead directionality; run-in capacitor forming
technologies developed by Jet Propulsion Laboratories and NASA; and AC inlet and outlet contacts with heavy silver
plating over extreme-purity copper, assuring the tightest grip possible.
A great system is built from a solid foundation, and that foundation starts with power. With an AudioQuest Niagara
5000EU, you’ll experience for the rst time the clarity, dimensionality, frequency extension, dynamic contrast, and
grip your system has always been capable of delivering—if only the power had been right!
We welcome you to experience the Niagara 5000EU and hear rsthand the remarkable results of highly optimized
power management: startlingly deep silences, stunning dynamic freedom, outstanding retrieval of ambience cues,
and gorgeous delineation of instruments and musicians in space. Once you’ve experienced it, it may seem so elegant,
so logical, and so easy that you nd yourself wondering why it hadn’t been done before.
—Garth Powell, Director of Power Products, Engineering, AudioQuest
Installation

6
Installation | Unpacking
Before unpacking your Niagara 5000EU, inspect the carton for any obvious damage to the boxes and internal
protective materials. If internal damage is likely, contact the carrier who delivered the unit. If shipping damage is
evident on the product, then please contact your shipping carrier. Please save all shipping and packing materials.
Should you move or otherwise need to transport your Niagara 5000EU, these packing materials will ensure the
safest transportation.
The double box set should contain the Niagara 5000EU (220-240V Schuko AC Outlets), two foam inserts,
owner’s manual, quick-start sheets, front-panel polishing cloth, and warranty registration card. Registration is
recommended. In the event that your original ownership documents are lost, your registration can be used to
establish whether the unit is within the warranty period.
Safety Information/Warnings
Before operating the Niagara 5000EU, please read and observe all safety and operating instructions (or, at the very
least, the quick-start sheet). Retain these instructions for future reference.
¡¡Do not disassemble or in any way modify the Niagara 5000EU.There are no user-serviceable parts inside.
¡¡Keep away from moisture and avoid excessive humidity.
¡¡Do not allow liquids or foreign objects to enter the unit.
Servicing/Return to AudioQuest
Servicing of the Niagara 5000EU must be performed by AudioQuest, and is only required when:
¡¡The Niagara 5000EU has been exposed to rain, ooding, or extreme moisture.
¡¡The Niagara 5000EU does not appear to operate normally. (See“Trouble-Shooting Guide.”)
¡¡The Niagara 5000EU has been dropped and sustained considerable physical damage.
If sending the Niagara 5000EU to AudioQuest for servicing (or shipping it for any reason), please use the factory
approved packaging materials. If you have lost any of these (double carton, two foam inserts, one poly bag),
please contact AudioQuest for replacements. We will provide replacement packaging materials for a nominal
charge; shipping costs will be paid by the individual or company requesting the packaging material. Please do not
rely on other methods of packaging, including those provided or suggested by packaging/mailing stores. These
methods and materials could seriously damage the product, as well as its nish. Even the loss of the thick polybag
is enough to permanently damage the nish during transport. If you have lost the original packaging material,
please request replacement materials from AudioQuest.
Power Source
Ideally, the power source to which the Niagara 5000EU is connected should be adequate for use at 220-240V 50Hz
single phase nominal voltage, 16 amps (current capacity RMS). However, the Niagara 5000EU will operate very
well with a 10-amp service outlet. If the maximum current capacity available is 10 amps, and the system exceeds
10 amps RMS current capacity, it is possible that there may be nuisance tripping at your electrical service panel.
This is not a safety issue; the electrical panel’s circuit breaker will trip if the maximum current capacity is exceeded.
For proper operation, the Niagara 5000EU requires a safety ground (supplied via the power utility AC wall outlet).
Placement
The Niagara 5000EU is manufactured with four rubber textured polymer feet for safe, secure placement on any

7
table, cabinet, shelf, or oor. When rack-mounting is required, these feet may be removed with a standard Phillips
screwdriver. The Niagara 5000EU’s design obviates the need for compliant or high-Q isolation feet. Although many
audio/video products benet greatly from these devices, the Niagara 5000EU may not.
Placement or proximity to other components is not critical, and, under standard use, the Niagara 5000EU does not
produce any appreciable heat. The Niagara 5000EU may be rack-mounted in a standard 19” rack by attaching the
optional Niagara Series 3-RU rack ears. To attach the optional rack ears to the Niagara 5000EU chassis, rst remove
the three Phillips athead screws from the front portion of both the left and right sides of the cover assembly.
Next, mount the rack ears ush against the back of the Niagara 5000EU’s front panel. Finally, secure the rack ears
into place by installing the rack-mount kit’s Phillips pan head SEMS screws.
When tight installations do not provide adequate room on a shelf or cabinet, the Niagara 5000EU can actually be
placed on its side. Such placement will pose no safety or performance compromises, but we recommend placing
a soft towel or carpet under the unit to prevent the chassis and front panel from being scratched or marred in any
way.
Connection to Audio/Video Components
AC Cable Routing
Once the Niagara 5000EU is placed, an appropriate 16-amp-rated AC cord must be connected to the rear panel
AC inlet (IEC-C20) connector. The AC cord must have an IEC-C19 female end connector and a grounded male
220-240VAC Schuko plug. We highly endorse the use of any AudioQuest NRG Series 16-amp-rated AC cord as the
Niagara-5000EU’s Ground-Noise Dissipation technology relies on its use, but the Niagara 5000EU will function
adequately with any appropriate AC cord that meets the aforementioned requirements.
When facing the Niagara 5000EU’s rear panel, the IEC-C20 inlet is located on the unit’s lower-left side. The AC input
cord must be connected to an appropriate AC outlet (see “Power Source,” page 6).
Whenever possible, it is best to keep at least three inches (approximately 7cm) between AC cables and any signal
cable. When this is not possible in a practical layout of system cabling, crossing the AC cables to signal cables at 90
degrees is best to minimize induced noise.
Connecting AC cables to the Niagara 5000EU’s NRG Schuko AC outlets – WARNING!
TheAudioQuestNRGSchukoACoutletsfeature(asdoall Schuko femalereceptacles),reversible polarityconnection.
Though both orientations are safe to use, only one is correct for lowest noise and thus, best performance. All
Schuko AC outlets (1 through 12) can be measured with a polarity checking device, to determine which orientation
is best for the AC cord that is connected to your walls AC service outlet. Make certain you turn the front panel
power switch/breaker o between measurements and unplugging the cords.
To determine the optimum orientation of the outlet’s AC cords, a polarity check device or even a digital multi-
meter is not always ideal. This is because many component power supplies feature bi-directional supplies, but
one direction typically has less current leakage than the other. It is best to listen to each component one at a
time and determine which orientation is best, then mark the outlet and the AC cords plug. The simplest means of
determining this is with no signal, but with all volume controls set to maximum.The quieter of the two orientations
is the correct one. For line-level components it may be necessary to place your ear by the loudspeaker high
frequency driver in a quiet environment, or; use audio to determine the most coherent non-distorted sound.

8
Marking polarity or orientation on AC outlets or cord plugs should be done discreetly with a tape or ink pen that
can be removed with either isopropyl alcohol or household cleaner on a cotton swab.
High Current/Low-Z Power Banks
There is one High Current/Low-Z Power banks (labeled AC outlets“1”through“4”).The outlets feature our Transient
Power Correction Technology, and are designed to enhance the performance of power ampliers via our circuit’s
low-impedance transient current reservoir. Power ampliers, mono-block ampliers, integrated ampliers,
powered receivers, or powered subwoofers should be connected to these four outlets. The primary mono, stereo,
or multi-channel power amplier(s) should be connected to AC outlet number 1. This enables the standby sense
circuit, which requires the current draw of a power amplier connected to (and only to) outlet number 1. In terms
of sonic performance, there is no dierence between outlets 1 through 4. If the standby sense circuit is not utilized,
and the sense circuit bypass switch is set to “Enabled,” any of the four high current outlets may be utilized.
For systems with only one or two power ampliers, the two uppermost outlets of the high current banks will
provide slightly superior performance due to their closer proximity to the AC outlets’ radio frequency noise-
dissipation circuit. However, the outlets located directly below will certainly aord exemplary performance!
Regardless of class of operation or circuit topology (valve, solid-state, digital, or otherwise), the Transient Power
Correction Circuit will not compress the current of any power amplier. Quite to the contrary, it will improve the
amplier’s performance by supplying the low-impedance current source that the amplier’s power supply so
desperately needs.
However, the other eight AC outlets (Ultra-Linear Noise-Dissipation System) are not appropriate for power
ampliers. They have been optimized for line-level audio preampliers, DACs, universal players, turntables, and
video products that utilize constant current voltage amplier circuits. These circuits never suer from current
compression, but their lower input level and higher gain require a more robust means of noise dissipation. This
is key to the Niagara 5000EU’s discrete AC power banks, in that not every circuit is treated the same, but rather
isolated bank by bank and optimized for best performance.
Ultra-Linear Noise-Dissipation System Power Banks
Ultra-Linear Noise-Dissipation System Power Banks
There are two banks that utilize this technology within the Niagara 5000EU. Both of these are in turn isolated from the
High-Current/Low-Z bank (outlets 1 through 4). This oers a great advantage in controlling the complex interactions
of RF (radio frequency) and other induced noises present in the AC power supplied from your utility, the noise that
will be present on and in every AC cord, and the noise that is produced within your system’s components and that
“backwashes”into the Niagara 5000EU’s output circuits.
Though it would be simple to recommend putting the digital or video components into bank 2, and the line-level audio
components and turntables into banks 3, the quest for optimal performance is more complex. This scenario will work,
and likely work well, but a certain amount of experimentation is best given the fact that no lter can eliminate 100% of
all noise, the size of many of these RF-induced waveforms is as small as the edge of this paper you’re reading, and the
interactions are complex. So long as the power ampliers are in their appropriate bank (outlets 1 through 4), and the
other components are in bank 2 (outlet 5 through 8) or bank 3 (outlets 9 through 12), you should experience exemplary
performance. Still, for the audiophile with patience, the reward will be system performance with the highest possible
resolution and lowest possible noise.

9
To achieve that optimal performance, we recommend the following guidelines. For systems that utilize very few
components, bear in mind that it is advantageous to use the uppermost outlets in banks 1, as they have a closer
proximity to the nal stage noise-dissipation circuits. Again, because each bank is isolated from the next, placing a DAC
and/or universal player in one isolated group, and a preamplier and turntable in another, would be an excellent way
to start. For systems that are much larger and require more outlets, try starting with the most basic setup, then adding
one component at a time. The combination that sounds best (yielding the greatest resolution) is the best one for your
system!

10
Suggested AC Connections
220-240 VAC 50Hz
16 AMPS MAXIMUM
POWER CORRECTION
31 5 7 9 11
42 6 8 10 12
STANDBY
ENGAGED
HIGH CURRENT |LOW-Z POWER CORRECTION
NIAGARA-5000 DESIGNED AND TESTED IN U.S.A.
16 AMPS RMS MAXIMUM OUTPUT 16 AMPS RMS MAXIMUM OUTPUT
ULTRA-LINEAR NOISE-DISSIPATION SYSTEM
1
“Engaged”
position must be
default setting.
16 Amp
Rated
AC Cord
Note: Banks 3 through 6 are subject to many variables and circuit conditions, so experimentation for
best results is encouraged. Power ampliers must be connected to banks 1 or 2.
Stereo
Amplier
Powered
Loud-
Speaker
Powered
Loud-
Speaker
Line-Level
Preamp
Phono
Pre-
amplier
Turntable
Flat Screen
Monitor /
Projector
Cable /
Satellite
Box
Universal /
CD Player
DAC
Phono Amp
Cable / Sat Box DAC
Line-Level Pre Amp
Mono Block
Phono Amp
Cable / Sat Box DAC
Line-Level Pre Amp
Mono Block
Phono Amp
Cable / Sat Box DAC
Line-Level Pre Amp
Mono Block
Phono Amp
Cable / Sat Box DAC
Line-Level Pre Amp
Mono Block
Phono Amp
Cable / Sat Box DAC
Line-Level Pre Amp
Mono Block
Phono Amp
Cable / Sat Box DAC
Line-Level Pre Amp
Mono Block
Phono Amp
Cable / Sat Box DAC
Line-Level Pre Amp
Mono Block
Phono Amp
Cable / Sat Box DAC
Line-Level Pre Amp
Mono Block
Phono Amp
Cable / Sat Box DAC
Line-Level Pre Amp
Mono Block
Phono Amp
Cable / Sat Box DAC
Line-Level Pre Amp
Mono Block
Phono Amp
Cable / Sat Box DAC
Line-Level Pre Amp
Mono Block

11
220-240 VAC 50Hz
16 AMPS MAXIMUM
POWER CORRECTION
31 5 7 9 11
42 6 8 10 12
STANDBY
ENGAGED
HIGH CURRENT |LOW-Z POWER CORRECTION
NIAGARA-5000 DESIGNED AND TESTED IN U.S.A.
16 AMPS RMS MAXIMUM OUTPUT 16 AMPS RMS MAXIMUM OUTPUT
ULTRA-LINEAR NOISE-DISSIPATION SYSTEM
2
“Engaged”
position must be
default setting.
16 Amp
Rated
AC Cord
Note: Banks 3 through 6 are subject to many variables and circuit conditions, so experimentation for
best results is encouraged. Power ampliers must be connected to banks 1 or 2.
Monoblock
Monoblock
Subwoofer
Subwoofer
Line-Level
Preamp
Phono
Pre-
amplier
Turntable Streamer
Universal /
CD Player DAC
Computer
Phono Amp
Cable / Sat Box DAC
Line-Level Pre Amp
Mono Block
Phono Amp
Cable / Sat Box DAC
Line-Level Pre Amp
Mono Block
Phono Amp
Cable / Sat Box DAC
Line-Level Pre Amp
Mono Block
Phono Amp
Cable / Sat Box DAC
Line-Level Pre Amp
Mono Block
Phono Amp
Cable / Sat Box DAC
Line-Level Pre Amp
Mono Block
Phono Amp
Cable / Sat Box DAC
Line-Level Pre Amp
Mono Block
Phono Amp
Cable / Sat Box DAC
Line-Level Pre Amp
Mono Block
Phono Amp
Cable / Sat Box DAC
Line-Level Pre Amp
Mono Block
Phono Amp
Cable / Sat Box DAC
Line-Level Pre Amp
Mono Block
Phono Amp
Cable / Sat Box DAC
Line-Level Pre Amp
Mono Block
Phono Amp
Cable / Sat Box DAC
Line-Level Pre Amp
Mono Block
Phono Amp
Cable / Sat Box DAC
Line-Level Pre Amp
Mono Block

12
Operation and Continuous Use
Power Switch/Circuit Breaker and LED Power Indicator
Once the AC cords are properly connected to the AC source tap, and the components are connected to the
appropriate outlet banks, it is safe to energize the Niagara 5000EU. On the right-hand side of the Niagara 5000EU’s
front panel, there is a black rocker switch. Firmly press the rocker switch so that its upper portion is ush with the
front panel. Typically within a couple of seconds, you should hear an audible “clack” sound(s) from one or more
relays within the Niagara 5000EU. At the same time, the front-panel LED power indictor will glow blue, signifying
that the unit is operational. (If this does not occur, see the “Trouble-Shooting Guide” in this manual.)
Rear-Panel Power Correction Switch/Niagara 5000EU Current Draw
The default position for this switch should always be “Engaged”—even for applications in which there are no
power ampliers of any kind powered by the Niagara 5000EU. Defaulting to “Engaged” serves two functions: It
activates the Transient Power Correction Circuit for power ampliers that would be energized by outlet bank 1
(outlets 1 through 4), and also provides a portion of the Ultra-Linear Noise-Dissipation Circuit for outlet banks
2 and 3 (outlets 5 through 12). Although no damage to the Niagara or the connected components will occur,
performance will be noticeably compromised when this switch is not set to the “Engaged” position.
However, there is one exception to this. Niagara 5000EU has an internal current sense circuit that will automatically
engage the Transient Power Correction Circuit, as well as turn it o when your audio/video system is placed in
standby mode. To utilize this feature, two things must be present:
1. The primary power amplier(s) or powered receiver must be connected to High Current/Low-Z
Power Correction Bank 1 – outlet 1 only (as it is the only power bank with the current sense
monitoring for this circuit function).
2. The primary power amplier(s) or powered receiver must have a power standby mode, and its
current consumption at 230VAC in standby mode must not exceed 25 watts. (Although 1 watt is
an industry standard for standby power, many great ampliers routinely dismiss it for reasons of
performance over power savings. Therefore, you should consult the specication sheet in your
amplier’s user manual.)
If these two requirements cannot be met, simply place the power correction circuit switch in the “Engaged”
position and leave it there! Rest easy, knowing that you will receive every last bit of performance the circuit
can deliver. However, if your system allows for the scenario listed above and your amplifier(s) or powered
receiver meets the criteria listed above, you may wish to take advantage of the standby circuit. (It is likely that
many systems will meet these criteria. However, if the standby function is not important to you, simply leave
the switch in the “Engaged” position).
The standby function was not created to place the connected system into a standby or switched mode, but
rather to place the Transient Power Correction Circuit into standby mode (disengaged), for instances when
the system is powered but not functioning (i.e., when there is no signal present). This was implemented
because the Transient Power Correction Circuit creates a reactive current draw of as much as 9 to 10 amps
RMS at idle (real world draw is a small fraction of an amp), and electrical technicians who connect a current
probe to a product such as this are frequently alarmed: They suspect that the product is either broken or that
it is drawing a distressingly high amount of current from the wall outlet (akin to a pair of mono-block power
amplifiers left in full operational mode).
This is actually far from the truth. If the Niagara 5000EU was consuming that much current (or even 20% of
that level), it would need to dissipate the energy loss in heat. It would be quite warm (even hot) to the touch,
just like most power amplifiers while in operation. In fact, the Niagara 5000EU runs cool, precisely because
this current reading is false. The circuit utilizes massive capacitive reactance across the AC line, which, akin

13
to a battery, will both absorb and immediately release the current several times per second. Further, when
incorporated with power supplies such as those found in power amplifiers, the current readings actually
come down! This is due to what’s known as a vector load, and it’s quite dynamic in an audio system. In
this scenario, there is one thing that can run somewhat warmer than it might otherwise: the AC cord that
supplies power to the Niagara 5000EU. This is because the wiring and the circuit breaker that supply power
to Niagara 5000EU simply look at RMS current and do not distinguish between reactive loads, resistive loads,
or inductive loads, but your utility does.
This circuit and many like it have been utilized for many years, and, when tested into buildings with absolutely
no loads present aside from the transient power correction circuit, there was virtually zero power draw from
the utilities power meter. Still, in an age where so-called “smart meters” are omnipresent, and some utilities
may or may not change their standards for “what type of power or current is suitable for billing,” we have
gone to great lengths to offer an alternative to those who may be concerned, but who nevertheless wish to
achieve the best possible audio or video performance.
Again, if you wish to utilize this feature, and your amplifier(s) and/or powered receiver meet the criteria,
simply place the Power Correction Switch in the “Standby” position. Otherwise, please leave the switch in the
“Engaged” position.
Extreme Voltage Indicator
One portion of the Niagara 5000EU’s non-sacricial surge protection is dedicated to a fast-acting extreme voltage
shutdown circuit. If more than 270VAC is present on the incoming AC line for more than a quarter of a second, the
circuit will instantly open a high-current relay that will disengage the AC power from all of the Niagara 5000EU’s
AC outlets, activating the red front-panel LED“Extreme Voltage” warning indicator. Once the event has passed, or
the building wiring fault has been corrected, the circuit will automatically re-engage.
Break-in Time/Continuous Use
The Niagara 5000EU is made of a variety of passive and active components.Though every attempt has been made
to reduce the necessity of so-called “break-in,” “burn-in,” or “run-in” time—including high-power run-in of every
critical capacitor in the Ultra-Linear Noise-Dissipation Circuits—the Niagara 5000EU will benet from continuous
use, just like any other audio/video component. This is not to say that you will be made to suer through weeks
or months of intolerable performance until that magic day when the parts are fully formed and ready. On the
contrary, the Niagara 5000EU will perform very well from the rst moment you use it. It will improve gradually, in
small increments, over a period of approximately two weeks. While leaving the Niagara 5000EU turned on during
this period will aid the process, it is also perfectly acceptable to turn the unit o; doing so will simply increase the
time it takes to reach nal“break-in.”
The Niagara 5000EU has a ve-year warranty, but it was designed to last for over two decades. Provided that the
Niagara 5000EU is used inside a home, store, studio, or oce with a reasonable climate (7 degrees to 38 degrees
Celcius, with less than 20% humidity), it can be left on continuously; there are no parts that will wear out.

14
Specications
Surge Suppression: Non-sacricial (nothing to damage with repeated 6000V/3000A
input surge tests, which is the maximum that can survive through a
building’s AC electrical panel).
Extreme Voltage Shutdown
Voltage:
270VAC (will activate the main high-current relay to open within less
than 0.25 second; automatically resets once the incoming power is
within a safe range).
Common-Mode Noise Dissipation: In excess of 30dB from 20kHz to 100MHz, linearized for dynamic
(rising) line impedance with frequency (source) and 10 to 50 ohm
load, system current dependent.
Transverse-Mode Noise
Dissipation:
In excess of 24dB from 3kHz to 1GHz, linearized for dynamic
(rising) line impedance with frequency (source) and 10 to 50
ohm load, system current dependent.
Input Current Maximum Capacity: 16 amps RMS (total).
Ultra-Linear Noise-Dissipation
System AC Power Outlet Banks:
4Isolated groups - total (bank 2 – outlets 5 and 6, or outlets 7
and 8) bank 3 outlets 9 and 10 or outlets 11 and 12).
Number of AC Outlets: 12 (4High Current/Transient Power Correction; 8 Ultra-Linear
Noise Dissipation System Power).
Power Consumption: Typically, less than 0.25 amps at 230VAC input, or with the power
correction switched to Standby setting.
(This is dependent on a reactive vector load. For more info, see “Operation
and Continuous Use: Rear-Panel Power Correction Switch – Niagara
5000EU current draw.”)
Dimensions: 445mm W x 133mm H x 437mm D (3-RU rack-mounting ears, optional)
Weight: 18kg.

15
Trouble-Shooting Guide
At AudioQuest, we always appreciate hearing from you. However, if you have questions, problems, or
suspect that your Niagara 5000EU requires service, please start here.
There is no power to any of the AC outlets.
When the Niagara 5000EU’s front-panel LED power indicator glows blue, the unit is operational. If the Power
On indicator is not lit, consider the following: Is the upper portion of the front-panel rocker switch fully ush
with the chassis? Is the input AC cord fully inserted into the Niagara 5000EU’s AC inlet? Is the input AC cord
properly plugged into the wall AC service outlet? Is the wall’s AC outlet functioning properly? Plug into the
outlet another component, product, or lamp to verify that power is present and that the electrical panel’s circuit
breaker has not tripped.
If there are only one or two AC outlets that have no output power, a component may be malfunctioning. Verify
the AC output with a known simple device such as a lamp.
There is no power to any of the AC outlets and the red front-panel Extreme Voltage
indicator is lit.
This indicates that either there is more than 270VAC (+/-3V) present on the wall’s AC service outlet, or the Niagara
5000EU’s protection circuit is miscalibrated. The latter is quite rare. (This circuit is adjustable, but it’s tested and
retested before it leaves the factory, and it’s glued into place, so shipping will not aect it.) Use an AC voltage
meter to determine if your outlet has too much voltage to be safe for operation, or if there is a wiring fault that is
causing this to occur.
Once the power is brought into a safe range for operation (165VAC to 266 VAC), the Niagara 5000EU’s protection
circuit will automatically switch to operational mode and the blue power indicator will light.
The main power rocker switch/circuit breaker tripped to the lower (o) position
while the system was playing.
You may have exceeded the maximum current capacity of the Niagara 5000EU. This should be rare, but it may be
possible. Typical power ampliers draw about one-third of their maximum current consumption at 220-240VAC,
as listed in the product’s specications (typically found in their owner’s manual). This is further complicated by the
fact that the power consumption to all AC source outlet groups (outlets 5 through 12), is an additional draw on the
maximum current capacity of 16 amps that will trip this switch/magnetic circuit breaker.
The Transient Power Correction Circuit may also contribute to the overall draw seen by the circuit breaker. Still,
it should be rare that the total capacity is exceeded, but, given that some televisions, projectors, and power
ampliers can draw substantial current, it is certainly not impossible. If this is the case, an additional Niagara
5000EU, and a discrete 16 amp AC service on the same phase of the electrical panel, will be required for some or
all of the power ampliers.
My power ampliers sound muddy, compressed, or weak.
The Transient Power Correction Circuit may not be operating. Be sure that all power ampliers, powered receivers,
powered loudspeakers, and or powered subwoofers are plugged into the High Current/Power Correction AC
outlets. If any of these are plugged into the Ultra-Linear Noise Dissipation System Power outlets, the connected
power amplier(s) will be current compressed, as the impedance is too high for any power amplier.
If the power amplier(s) are plugged into the High Current/Power Correction AC outlets, make certain that the
rear-panel Power Correction switch is in the “Engaged” position. Although it is possible for the Power Correction

16
Circuit to work properly while the switch is in the“Bypass”position (see“Power Correction Switch,”p.??), you might
nd that the unit sounds substantially better in the“Engaged”position. If this is the case, it is possible that the main
or primary power amplier(s) are not plugged into High-Current AC outlet 1, the power amplier has insucient
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 5000EU has no power ampliers 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 5000EU 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 5000EU’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 ampliers, 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 30 watts at idle. (For an in-depth explanation of the circuit, see “Power
Correction Switch,” page 12.)
My home or grounds were hit by lightning. The Niagara 5000EU seems to be
functioning properly. Should it be sent in for inspection or service? I did not notice
hum with any prior power device, but there is a hum in my system
with the Niagara 5000EU.
If you see or smell smoke coming from the unit, it needs service. Otherwise, if it functions after such an event (which
is very likely), there is nothing that would be compromised or damaged. If it fails after such an event, it will fail totally.
However, it’s unlikely that this would occur. The circuit is designed to easily handle any voltage or current surge that
could possibly make it past an electrical panel. The force required to damage the Niagara 5000EU via a power surge
would melt the panel and burn the building (in which case, the Niagara 5000EU is the least of your worries).
How do I clean the chassis and/or the electrical contacts?
The Niagara 5000EU’s black-painted chassis and dark chrome front panel can be cleaned with AudioQuest
CleanScreen, automotive polishing creams, or a modest misting of household window cleaners. Please use soft
cotton or wool toweling to remove the liquid from the metal and painted surface. Whenever possible, use the
supplied polishing rag for the front panel, only using liquid cleaner when oil or grime is beyond the polishing
cloth’s capacity to thoroughly clean. Never use alcohol or solvent-based cleaners. They can damage the surfaces,
paint, and silkscreening material.
The AC inlet, outlet posts, and grips are all generously plated with silver. There is no need to clean these if they
are not exposed to foreign substances such as grease and dirt. Silver oxide is a superior conductor to silver itself.
If cleaning is required, Isopropyl alcohol (preferably 99% purity) on a cotton swab is best for the inlet tabs. Some
manufacturers provide specialized cleaners for the AC output surfaces. Again, however, cleaning these surfaces
will most likely be unnecessary.
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

17
repair and you will be responsible for all shipping costs.
I hear a slight buzzing sound coming from the Niagara 5000EU. 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 5000EU, or only when you place your ear
next to the unit, the buzzing is normal and, unfortunately, cannot be eliminated.
What you are experiencing is a variation on the eect called magnetostriction. When an extraordinarily high
quantity of harmonic distortion is present on an AC line the hermetically sealed and damped Transient Power
Correction circuit can mechanically buzz as its internal electrical plates resonate at 50 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 eect on the performance or longevity of the Niagara 5000EU or its connected components.
Over ninety-nine percent of installations will never exhibit this problem, but that’s no comfort to the 0.1% that
do. Unfortunately, when this eect 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 that may be saturating, or; is in need
of replacement. Occasionally this may also be triggered by other large electrical appliances that have severely
asymmetrical power supplies. It can be useful to try turning the Niagara-5000EU on with an AC outlet that is on a
dierent phase from the electrical panel. This may require the help of an electrician, and some experimentation.

18
Warranty
The Quest Group, DBA: AudioQuest, warrants to the original purchaser of this AudioQuest Niagara
5000EU, will be free from defects in material and workmanship for a period of ve years. The purchaser
of the product is encouraged to complete the warranty registration by mail or on-line at the AudioQuest
website.
If the product does not conform to this Limited Warranty during the warranty period (as herein above
specied), purchaser shall notify AudioQuest in writing (or e-mail), of the claimed defects. If the defects
are of such type and nature as to be covered by this warranty, AudioQuest shall authorize the purchaser to
return the product to the AudioQuest factory (2621 White Road, Irvine, California, 92614 USA). Warranty
claims should be accompanied by a copy of the original purchase invoice showing the purchase date;
this is not necessary if the Warranty Registration was completed either by mailing in the completed
warranty card or by registering on-line at the AudioQuest website. Shipping charges to the AudioQuest
factory (Irvine, California, USA) must be prepaid by the purchaser of the product. AudioQuest shall, at
its own expense, furnish a replacement product or, at AudioQuest’s option, repair the defective product.
Return shipping charges back to the purchaser will be paid by AudioQuest.
All warranties contained herein are null and void if: the AudioQuest AC power product (Noise-Dissipation
System) has been opened, improperly installed, altered in any way, or tampered with. AudioQuest is not
responsible for any connected equipment or any claims of damage to connected equipment due to
the occurrence of an AC power surge, spike, or over-voltage event, unless AudioQuest determines after
thorough inspection and testing by AudioQuest (with product shipped to AudioQuest USA at the owner’s
expense), that the protection circuitry was in whole or in part improperly functioning. AudioQuest is not
responsible for any connected equipment that is damaged due to external signal lines (non-AC power
lines), that carry an electrical storm or signal wiring fault surge or spike (such as Ethernet, cable, and
satellite connections).
All AudioQuest AC power products (Noise-Dissipation Systems), must be plugged directly into a properly
wired AC power line with a protective ground. All AudioQuest AC power products (Noise-Dissipation
Systems) cannot be “daisy-chained” together in serial fashion with other AC power strips, UPS’s, other
AC surge protectors, AC power conditioners, or AC extension cords. Any such installation voids the
warranty. The AudioQuest warranty only protects against damage to properly connected equipment
or AC cables where AudioQuest has determined, at its sole discretion, that the damage resulted from
an AudioQuest power product (Noise-Dissipation System) circuit or protection circuit malfunction and
does not protect against acts of God (other than lightning), such as ood, earthquake, war, terrorism,
vandalism, theft, normal-use wear and tear, erosion, depletion, obsolescence, abuse, damage due to
low-voltage disturbances (i.e., brownouts or sags), or system equipment modication or alteration. Do
not use this product in any way with a generator, heater, sump pump, water-related devices, life-support
devices, medical devices, automobile, motorcycle, or golf-cart battery charger. To be used indoors only
and in dry areas. All warranties contained herein are null and void if used in any way with any of the
aforementioned devices.
THE FOREGOING IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT
LIMITEDTOTHE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
AudioQuest does not warrant against damages or defects arising out of improper or abnormal use or
handling of the product, against defects or damages arising from improper installation, against defects
in products or components not manufactured by AudioQuest, or against damages resulting from such
non-AudioQuest made products or components. This warranty shall be cancelled by AudioQuest at its

19
sole discretion if the product is modied in any way without written authorization from AudioQuest.
This warranty also does not apply to products upon which repairs have been aected or attempted by
persons other than then pursuant to written authorized by AudioQuest.
THIS WARRANTY IS EXCLUSIVE. The sole and exclusive obligation of AudioQuest shall be to repair or
replace the defective product in the manner and for the period provided above. AudioQuest shall not
have any other obligation with respect to this product or any part thereof, whether based on contract,
tort, strict liability, or otherwise. Under no circumstances, whether based on this Limited Warranty or
otherwise, shall AudioQuest be liable for incidental, special, or consequential damages. AudioQuest
employees or representatives’ORAL OR WRITTEN STATEMENTS DO NOT CONSTITUTE WARRANTIES, shall
not be relied upon by purchaser, and are not a part of the contract for sale or this limited warranty. This
Limited Warranty states the entire obligations of AudioQuest with respect to the product. If any part
of this Limited Warranty is determined to be void or illegal, the remainder shall remain in full force and
eect.
Warranty claims should be accompanied by a copy of the original purchase invoice showing the date
of purchase. (If a Warranty Registration Card was mailed in at the time of purchase or if the product was
registered on-line, this is not necessary.) Before returning any equipment for repair, please be sure it is
adequately packed and cushioned in either the original or a new AudioQuest factory-supplied polybag,
foam insert pair, and dual carton set to protect against damage in shipment, and that it is insured.

February/2017
©2017 AudioQuest • California, USA • The Netherlands • Hong Kong • www.audioquest.com • Email: [email protected] • Made in USA