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AudioQuest PowerQuest 303 12-Outlet Power Conditioner & Non-Sacrificial Surge Protector
Advanced Power Filtration for Enhanced Sound and PictureEngineered with advanced power filtration, the PowerQuest 303 removes significantly more noise and distortion than typical power conditioners, helping your system perform at its best.
High-Performance, Detachable Power CableThe detachable PQ-415 cable uses AudioQuest’s high-purity Semi-Solid Long-Grain Copper conductor metal in which strands are packed more tightly and never change position within the bundle, significantly reducing strand-interaction distortion. Long-Grain Copper further minimizes distortion caused by grain boundaries that exist within any metal conductor. A fundamental aspect of AudioQuest's multifaceted Noise-Dissipation technology, Direction-Controlled Conductors ensure induced noise is dissipated and drained properly — away from the system’s vulnerable circuitry.
Powerful Surge Defense with Long-Term Reliability
With non-sacrificial surge protection, the PQ-303 goes beyond traditional surge protectors. It safeguards against high voltage and current, preventing damage to your equipment and ensuring the device’s long-term reliability. The Extreme Voltage Shutdown feature activates the main power circuit relay in less than 0.25 seconds at 140VAC and automatically resets once power returns to a safe level.
Built to Withstand the Strongest Surges
Built to endure rigorous 6000V/3000A input surge tests, the PQ-303 can withstand multiple surges at the highest level that a building’s AC panel can survive, offering reliable protection without components wearing out over time.
Purpose-Built Outlets for Ultimate Performance
Each of the PowerQuest 303’s outlets is specifically engineered for optimal performance in your home entertainment system. It includes:
- 4 High-Current Outlets: Designed for soundbars, power amplifiers, audio/video receivers, or subwoofers.
- 8 Linear Filtered Outlets: Ideal for audio/video source components, computers, modems, or routers.
- Linear Noise-Dissipation: Ensures consistent noise reduction for black backgrounds and detailed sound
- Non-Sacrificial Surge Protection: Reliably withstands multiple strikes of 6000V or 3000A — the maximum that can survive through a building’s AC electrical panel — without damage
- Extreme-Voltage Shutdown: Disengages AC power in under 0.25 seconds when presented with 140VAC
- 12 AC outlets: 4 High-Current for amplifiers; 8 Linear-Filtered for source components
- Detachable Power Cable Included: 2 meter PQ-415 Detachable Power Cable avoids current compression, reduces distortion, dissipates noise.
- Rack Mountable: 2RU Rack Ears included for simple rack-mounting
- Flat to Wall Plug: Aids installations in tight spaces
Key Features & Technology Explained
Level 1: Linear Noise-Dissipation
Comprises Differential-Mode filtering, which addresses asymmetrical noise already present on the utility line or backwashed via electronic appliances and components.
Level 2 Power Cable
Contains Directionally-Controlled Semi-Solid Concentric conductors to further reduce noise.
12x Outlets
4x High-Current and 8x Source outlets designed to enhance your home entertainment system.
Rack Mountable
AudioQuest power conditioners boast a space-saving rack-mountable design, seamlessly fitting into home theater A/V racks.
Non-Sacrificial Surge Protection
Will accept multiple transient power surges and spikes up to 6000V or 3000A (the maximum that can make it through a home or office electrical panel). Damage from electrical storms or power-line interruptions is virtually impossible. Set it and forget it.
Catastrophic Surge Protection
Protects against lightning strikes and large-scale power surges.
Micro-Spike Protection
Protects against daily short, fast power spikes that damage equipment over time.
Extreme Voltage Shutdown
At 140VAC, the main power relay opens in <0.25s, resetting when power stabilizes, ensuring protection against voltage spikes for your devices.
Flat-to-Wall 45° Plug
Flat-to-Wall 45° Plug can be easily installed in tight spaces behind furniture or other hard-to-reach areas.
Bill
August 29, 2025
I added this to my 2-channel audio set-up with a Naim Uniti Atom, Music Hall TT, and Denon DVD-9000. It filtered my very noisy power feed brilliantly. I can't imagine how the higher end AudioSource products could get any better. I was hesitant due to the price but, wow, I am blown away. It's heavy, well built, and the connections are solid. I would highly recommend this to anyone with noisy buzzing power lines, and it's a surge suppressor to boot!! How can you go wrong!?
Bob H.
August 26, 2025
Noticeable difference in my sound system
Don
July 21, 2025
Using the 303 with the stock power cable which is the equal to AudioQuest x2 cable, I did not notice any improvement in picture Quality on either apple tv or regular tv stations. Apple music on apple 4k tv showed an increase in sound stage, a little more ambience and more fine details in the music. Next I connected the Audio Quest y2 power cable to the 303, this time I noticed an increase in contrast to the picture on both Apple 4k box and tv stations and a little sharper as a result. There was a larger impact to the music this time the noise floor dropped even more. The sound stage spread out further and deeper and more 3d. Now the musical instruments spread out evenly across the stage. Music had more body, bass was stronger. Music in Dolby Atmos had even greater channel separation. Classical music in Atmos was very smooth against what felt like a black velvet background. That shows that the quality of the cable really does matter. Don.
Bill
July 19, 2025
I added this to my 2-channel audio set-up with a Naim Uniti Atom, Music Hall TT, and Denon DVD-9000. It filtered my very noisy power feed brilliantly. I can't imagine how the higher end AudioSource products could get any better. I was hesitant due to the price but, wow, I am blown away. It's heavy, well built, and the connections are solid. I would highly recommend this to anyone with noisy buzzing power lines, and it's a surge suppressor to boot!! How can you go wrong!?
Bob H.
March 8, 2025
Noticeable difference in my sound system
Don
December 28, 2024
Using the 303 with the stock power cable which is the equal to AudioQuest x2 cable, I did not notice any improvement in picture Quality on either apple tv or regular tv stations. Apple music on apple 4k tv showed an increase in sound stage, a little more ambience and more fine details in the music. Next I connected the Audio Quest y2 power cable to the 303, this time I noticed an increase in contrast to the picture on both Apple 4k box and tv stations and a little sharper as a result. There was a larger impact to the music this time the noise floor dropped even more. The sound stage spread out further and deeper and more 3d. Now the musical instruments spread out evenly across the stage. Music had more body, bass was stronger. Music in Dolby Atmos had even greater channel separation. Classical music in Atmos was very smooth against what felt like a black velvet background. That shows that the quality of the cable really does matter. Don.
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