Unleashing Audio Power: The Sound Application TT-7 AC Power Distributor

Elevate your audio experience with the Sound Application TT-7 AC Power Distributor, a game-changer in power-line conditioning.

Introduction to Power-Line Conditioning

The realm of power-line conditioners has largely remained stagnant over the past decade, with new products that fail to make a significant impact. Numerous devices have hit the market aimed at mitigating power-line noise caused by radio frequency interference (RFI) and electromagnetic interference (EMI). My journey through various products, from isolation transformers to AC regenerators, led me to realize their limited success. However, this changed with the introduction of the Sound Application’s newest power-grid interface—the TT-7, also known as the San Francisco Standard (SFS). Founded over two decades ago by Jim and Connie Weil, Sound Application has been dedicated to improving power-line filtration, and their efforts have culminated in the exceptional SFS.

The Challenge of Power-Line Noise

Living under the typical constraints of a power grid often means dealing with power outages and noise. Many of us take the power grid for granted, but when it falters, we're reminded of our reliance on it. Even a well-functioning grid isn't devoid of noise.

To better understand AC mains filters, it's essential to grasp the basics of how our electrical systems operate. Each outlet connects to the grid through a circuit breaker, with a neutral wire grounded at both the transformer and breaker box. The setup includes two "hot" 120V wires arranged to provide 240V circuits. An ideal scenario would see only 50/60Hz current flowing into the breaker box. Unfortunately, high-frequency noise also infiltrates due to various issues, such as micro-arcing within power-line hardware. As the National Association for Amateur Radio notes, “arcs can occur for several reasons, including loose hardware, a cracked insulator, [surface] tracking, corrosion between two pieces of metal, or a loose tie wire."

Understanding Power-Line Noise

Sound Application's research indicates that the main method of noise transmission in the U.S. grid occurs in transverse mode—measured between neutral and hot wires. However, common-mode noise, measured between ground and neutral, is also present. Within homes, sources of electromagnetic interference abound, from electric motors to Wi-Fi routers, fluorescent lights, and non-compliant power supplies.

The primary role of the SFS power-grid interface is to filter out high-frequency noise currents present along the AC power lines. It functions as a low-pass filter, directing unwanted noise to ground while allowing clean 60Hz (or 50Hz) current to energize audio gear. My extensive listening experiences have shown that clean AC power is vital for superior sound quality.

Design and Innovations of the TT-7

For over 20 years, Sound Application's interfaces have been integral to my audio setup, particularly due to their ability to handle high current without limiting performance. Since 2021, I've enjoyed the previous version of the TT-7 until Jim Weil reached out with exciting news regarding an updated model—the 120/240-volt SFS TT-7. This new version employs advanced materials, including heat-treated medical-grade Teflon caps, G5 titanium hardware, and 7N 10AWG power wire.

What's crucial about the SFS design is its reduction of excessive reactance, a common issue with power-line conditioners. “We are addressing the one fundamental problem with power-line conditioner design, excessive reactance,” Jim explained. The new universal SFS design utilizes a complex LC network to drastically minimize reactance at 60Hz. With a 3GHz-bandwidth transverse-mode filter and a 1.1GHz common-mode filter, the TT-7 remains virtually invisible to audio gear, allowing only pure AC mains to pass through.

Externally, the TT-7 boasts a 5-kilogram CNC-machined solid-brass base, known as the PowerBase, which adds mass to manage low-frequency vibrations. Inside, the filter networks exist within an aluminum chassis designed to be tunable for optimal performance.

Setup and Performance

The physical layout features a 20-amp IEC input receptacle and three 20-amp duplex outlets, enabling up to six power cords. For best performance, Sound Application recommends specific outlet usage: the first for digital gear, the center for sensitive equipment, and the last for high-current devices. Interestingly, greater current draw enhances performance, meaning the TT-7 doesn't interfere with the music's dynamics.

Despite skepticism about the sonic impact of power-line noise, I found that it significantly affects audio clarity. Many may argue that AC line noise doesn't compare to inherent distortion from audio components, but my experiences reveal that power-line noise is audible, often overlaying an amplifier’s character. It creates distortion that manifests as a haze or glare, making it frustrating to identify the true source of sonic issues.

“AC related distortion hides in background, resulting in haze, grain, or glare.”

Experience with the TT-7 SFS

In my quest for audio perfection, I’ve often encountered upper midrange glare and grainy textures, especially with string instruments. Upon using the TT-7 SFS, the clarity and resolution of my audio improved remarkably. It seemed to eliminate the annoying texture issues that previously plagued my listening experience.

The TT-7 SFS dramatically improved the background silence, revealing a wealth of low-level details. For instance, during a listening session of Bach’s Toccata and Fugue in D minor performed by Pierre Bardon, I was awestruck by the clarity of the acoustics in the historic church, allowing the richness of sound to truly resonate.

The soundstage gained depth and width, providing a convincing three-dimensional experience. The separation of voices in choral recordings, such as on Laudate! became effortlessly discernible, showcasing the advanced capabilities of the TT-7 SFS.

Conclusion

In summary, the new Sound Application TT-7 SFS power-grid interface surpasses all previous filters and conditioners I've tested. With a projected lifespan of 50 years, it promises enduring performance. This device truly represents an amplifier’s best companion, and once experienced, it's hard to imagine living without it. While I recognize the cost, it's an investment in the pursuit of superior audio quality.

Specs & Pricing

• Power input receptacle: 20 amp IEC
• Outlets: Three 20-amp high-conductivity duplex U.S. outlets
• Circuit breaker: 20-amp Carling high-speed magnetic breaker
• Transverse mode filter: 3GHz bandwidth
• Common mode filter: 1.1GHz bandwidth
• Dimensions: 6.3″ x 3.3″ x 16″
• Weight: 17 lbs.
• Price: $25,000

Associated Equipment

• Phono front end: Kuzma Reference turntable; Kuzma Stogi Reference 313 VTA tonearm; Clearaudio da Vinci V2 MC phono cartridge
• Phonostage: PrimaLuna EVO 400
• Line preamplifier: PrimaLuna EVO 400, Joule Electra LA-150 MKII
• Digital front end: Denafrips Terminator DAC
• Digital source: Qobuz streaming via Audirvana Studio software, Ideon Audio 3R Renaissance mk2 Black Star USB regenerator/reclocker
• Loudspeaker: Fyne Audio F703SP, Analysis Audio Omega planar-magnetic
• Power amplifier: PrimaLuna EVO 400 monoblocks, Audio Research VS115, SMc Audio DNA-1/GT-21 Ultra upgrade
• Cables: Kimber Select KS1016 and KCAG interconnects; 8N OCC speaker cable

Frequently Asked Questions

• What makes the Sound Application TT-7 unique compared to other power conditioners? The TT-7 utilizes advanced materials and design to minimize reactance and ensure pure AC power delivery, resulting in superior sound quality.
• How does power-line noise affect audio quality? Broadband power-line noise can distort audio signals, causing issues such as graininess and glare, which interfere with the listening experience.
• What kind of outlets does the TT-7 feature? The TT-7 comes equipped with three 20-amp high-conductivity duplex U.S. outlets which are optimized for various types of audio equipment.
• Is the TT-7 suitable for home theater systems? Yes, the TT-7 can enhance the performance of any audio system, including home theater setups, by providing cleaner power.
• What is the lifespan of the TT-7? The projected lifespan of the TT-7 is 50 years, making it a long-lasting investment for audio enthusiasts.

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