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I own Bliss Hifi, a high-end audio boutique based in Minnesota. This AudioQuest Niagara 5000 power conditioner is in on consignment from one of my local clients. The unit is in very good condition and in perfect working order. The mirrored front panel is especially well kept. There are some marks on the top of the unit left by rubber footers from a component that was previously stacked on top of it, but these do not affect performance and are not visible when the unit is in a rack or on a shelf. Single owner, purchased in 2021.

The unit comes with its original box and power cable.

The Niagara 5000 is the sweet spot of AudioQuest’s power conditioning lineup. It delivers 90% of the source-component performance of the flagship Niagara 7000 and 100% of the amplifier performance, at roughly half the price and less than half the weight. That is not marketing spin; that is AudioQuest’s own characterization of where the 5000 sits relative to the 7000. The difference between the two is that the 7000 adds dielectric-biased symmetrical power isolation transformers for its source-component outlets, which accounts for the extra 40+ pounds and the extra cost. For the four high-current outlets that feed your amplifiers, the 5000 and 7000 are identical in performance. The Transient Power Correction circuit is what sets the Niagara apart from most competing power conditioners. It provides an instantaneous current reservoir of over 90 amps peak for up to 25 milliseconds, which means your amplifier gets the current it demands during dynamic peaks without compression or restriction. Bass gets tighter, dynamics get larger, and the system sounds more powerful without changing a single component. Garth Powell, who designed the Niagara series, brought over 20 years of experience in power products for professional audio and broadcast engineering to this project, and it shows in how comprehensively the 5000 addresses every vector of AC power contamination: differential-mode noise, common-mode noise, ground-borne noise, and transient voltage events. The non-sacrificial surge protection survives repeated 6000V/3000A surges, which is the maximum that can make it through a residential electrical panel. There is nothing to wear out or replace.

There are currently several other components from this client’s system available. Take a look through our preowned listings to see them all.

Happy to answer any questions. Thanks for your consideration.

Check my stellar feedback and buy with confidence. This listing includes free insured shipping across the CONUS. As this is a passthrough sale that I am brokering on behalf of my client, I prefer to accept payments via PayPal F&F, Venmo Gift, or personal check, but this also gives you the opportunity to attain this at my lowest possible price. Credit card payments are also possible for a 3.1% convenience charge.

More about the unit:
The AudioQuest Niagara 5000 is a 12-outlet AC power noise-dissipation system designed by Garth Powell, AudioQuest’s director of power products, drawing on over 20 years of research into AC power management for audiophile, broadcast, and professional audio applications. The Niagara 5000 incorporates three core technologies. The patented AC Ground-Noise Dissipation System addresses ground-borne noise that most power conditioners ignore entirely, dissipating it without compromising electrical safety or creating ground loops. The Level-X Ultra-Linear Noise-Dissipation Technology provides more than 23 octaves of differential-mode filtering from 3kHz to 1GHz with in excess of 24dB reduction, and 16 octaves of common-mode filtering from 20kHz to 100MHz with in excess of 30dB reduction, all with linear response optimized for varying line and load impedance to prevent resonant peaking or gaps in noise reduction at adjacent octaves. The passive/active Transient Power Correction circuit provides an instantaneous current reservoir of over 90 amps peak for up to 25 milliseconds, specifically designed for current-starved power amplifiers. The Niagara 5000 features 12 outlets divided into two groups: four high-current outlets for power amplifiers and eight noise-dissipation outlets for source components. All outlets are AudioQuest’s proprietary NRG Edison design with heavy silver plating over extreme-purity copper contacts, providing an exceptionally tight grip on power cable plugs. All internal wiring is direction-controlled for efficient dissipation of radio-frequency noise, and all filtering capacitors use run-in forming technologies developed by Jet Propulsion Laboratories and NASA. Surge protection is non-sacrificial, surviving repeated 6000V/3000A input surge tests (the maximum that can survive through a residential electrical panel) with nothing to degrade or replace. Extreme voltage shutdown activates at 140VAC within less than 0.25 seconds and automatically resets when incoming power returns to a safe range. Zero Ground-Contamination Technology prevents noise or surge energy from ever connecting to the AC ground. Maximum RMS input current is 20 amps. The Niagara 5000 accepts a 20A IEC power cord. The mirrored front panel and black chassis match the Niagara 7000. Stereophile Recommended Component. The Absolute Sound 2026 Editors’ Choice Award. Dimensions: 17.5 x 5.875 x 17.2 inches (W x H x D). Weight: 44 lbs.

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