PSI Audio AVAA C20 defeats low-frequency noise in studios, offices and flats with its innovative technology

PSI Audio has revolutionised acoustics with the AVAA C20. For years now, the system has eliminated disturbing room modes in studios and listening rooms all over the world. Due to its unique functioning principle, the applications go far beyond professional audio, though. From boiler and machine rooms to restaurants and clubs, AVAA can improve the sonic character of any place that has the unfortunate disadvantage of having walls. The active bass trap has even defeated the London subway! There is no end to the widespread applications for the system and its outstanding technological achievement.

The contents of this press release

  • PSI Audio AVAA solves problems in the studio and beyond
  • True Rumble Elimination: PSI Audio AVAA C20
  • Boiler room noise – gone!
  • Peace and quiet for efficient work and recuperation
  • Creating an atmosphere: clubs and restaurants
  • AVAA beats the London subway
  • Innovative technology and precision manufacturing: PSI Audio
  • Prices, colours and availability

Yverdon-les-Bains, 23rd June 2021

Acoustically speaking, the world we live in has a problem: walls. While they do pose an obstacle against the elements and predators, they also obstruct the motion of sound waves, creating reflexions, interferences and resonances. Combating these acoustic side effects of architecture proves problematic, particularly in the low frequencies: the low end of the hearing spectrum has high energy, long decay times and requires a lot of space and material to be taken care of in traditional passive acoustics. These challenges explain why the AVAA C20 made such huge waves when PSI Audio introduced it in November 2015. And it also explains why its application has since gone way beyond professional audio environments to pretty much any place that suffers from the sonic effects of walls.

True Rumble Elimination: PSI Audio AVAA C20

The AVAA C20 was developed by PSI Audio as a compact and innovative solution for that famously hard to tackle frequency range from 15 to 150 Hz. It requires a lot less space than traditional porous absorbers dealing with the same frequencies due to its active approach. However, its clever technology works without specific resonances, DSP or anti-sound, hence acting latency- free and without calibration. It just sucks the resonant sound waves out of the room – which also means that the result is not specific to one listening spot, but the overall acoustic performance of the room is improved. The room modes simply disappear, the rumble is eliminated, leaving a sharper, more precise bass, clearer mids and crisper treble by reducing the total sonic energy in the room. With a device this efficient, it is no wonder that people soon started finding applications for it beyond optimising listening rooms.

Boiler room noise gone!

When a tenant complained to their landlord about a disturbing rumbling noise, the landlord did not know what to do. It was clear that the reported noise came from the heat pump located in a small cellar room two floors below the flat, but it was encased in solid wall and closed with a massive door exactly to keep the noise from spilling out. Since the noise was very low at around 50 Hz, the small boiler room acted as a kind of resonator, amplifying the frequency and transmitting it through the solid structures into the entire building. Combating a problem like this would usually take up considerable resources in both time and budget, possibly requiring architectural changes to be made. In comes AVAA: two devices placed in the boiler room eliminated the noise completely, stopping the room from resonating and hence keeping the rumble from spreading through the building.

Peace and quiet for efficient work and recuperation

Another interesting case occurred in a university hospital. New offices had been installed in rooms directly underneath a big machine room containing air conditioning units, cooling systems and other loud machinery. The office workers soon complained about the noise, but what can you do? Both the offices and the machines are required. Expectations were not high when four AVAA C20 were installed for testing purposes – after all, what would those tiny devices be able to achieve against the big motors operating in that room? After conducting a blind test, the answer was clear: the manager would switch the AVAA systems on and off during the day, and the office workers would note when the noise was unbearable. Sure enough, whenever AVAA was active, there were no complaints. Knowing how unnerving and even harmful continuous noise pollution can be, PSI Audio AVAA technology not only helped the office workers, but probably also a number of patients in the hospital who then did not have to put up with some nondescript rumble while trying to heal.

Creating an atmosphere: clubs and restaurants

Restaurants and clubs of any type often put very little effort into their acoustics. The result are places that may look nice and inviting, but where patrons have to shout at each other to understand a word – and the fact that then everyone is shouting does of course not help matters. While mid and high frequency reflexions from naked walls can be an issue, it is often the accumulated low rumble that masks the higher parts of the spectrums with its superior energy levels. This is particularly true when there is a prominent source of music, be it from the radio, a DJ or live bands. Strategically placing AVAA devices in such spaces can significantly improve speech intelligibility and even help with the neighbours, as resonances are suppressed before they can become a serious issue.

AVAA beats the London subway

For a device the size of the PSI Audio AVAA C20, defeating the London subway is quite an impressive feat. When an apartment building was erected above the subway, the residents soon found themselves disturbed by low frequency noise. It was not even the direct sound of the subway that wore on the people, but rather the noise amplified by the two parking floors and the flats themselves. Again, resonance strikes badly. And again, AVAA is the solution: installing four AVAA C20 in suitable locations reduced the noise in the apartments above significantly, improving the life quality of the residents within a very reasonable budget.

Innovative technology and precision manufacturing: PSI Audio

In developing the Active Velocity Acoustic Absorber AVAA C20, PSI Audio took an entirely different approach to eliminating sound. Instead of wearing it out with a large amount of qualified materials or nullifying it by adding reversed sound, which would only work for specific positions, this new system imposes an acoustic impedance. It basically creates a virtual hole in the wall, a black hole that sucks in resonant frequencies in the problematic bass spectrum. To make this system work, DSPs are out of the question as their introduction of latency would entirely defeat the purpose. For an analogue solution to achieve the functional efficiency of AVAA, it needs to be extremely accurate – a quality PSI Audio is known for around the world. PSI Audio products are renowned for their proverbial Swiss precision, every single speaker and every AVAA C20 is measured and calibrated in the company’s own anechoic chamber before shipping. Handmade by specialists in the Swiss manufacture, the technological innovation goes hand in hand with impeccable craftsmanship to create some of the most impressive products in the industry.

Prices, colours and availability

The Active Velocity Acoustic Absorber AVAA C20 is available in the standard colours black and white as well as the entire RAL spectrum for an additional charge. Depending on room size and application, multiple devices may be required for the desired effect.

About PSI Audio

For over 40 years, Swiss company Relec SA manufactures high-quality systems for professional audio reproduction. The company’s brand PSI Audio is firmly established in the field of studio speakers. The brand’s philosophy: 100 percent analogue circuitry without DSP, top quality through manufacturing in the company’s own facilities – and absolutely accurate reproduction. PSI Audio speakers play exactly what is present in the music, not adding anything to it or leaving anything out. With its active bass trap AVAA C20, PSI Audio also revolutionizes room acoustics.