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Current Issue : November-December 2021
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Articles May-Jun 2022

CONTRIBUTION TO THE PRO AUDIO INDUSTRYNew!

Honouring the Legacy
Glimpse of One of The Plants at Noida, U.P.

This year PALM + AV-ICN is honouring the AHUJA FAMILY for their Leadership of over Eight Decades in the Pro Audio Industry with the Lifetime Contribution to The Pro Audio Industry Award at the PALM Sound & Light awards. This award recognizes over... read more

Articles May-Jun 2022

AV ARCHITECT OF THE YEARNew!

Awarded for highest standards in adopting best innovation and vision in AV Architecture
NARENDRA NAIDU, Chairman and Managing Director, Rhino Engineers Pvt. Ltd.

This award has been instituted for an AV Architect chosen by AV-ICN platform to be recognized for the quality of his body of work, incorporating the best innovation and vision in AV architecture. In this feature,... read more

Articles Mar-Apr 2022

Milind Raorane Sets the Tone at ToyRoom MumbaiNew!

ToyRoom outfitted its second outpost in Mumbai with Electro-Acoustic Design Consultant Milind Raorane to deploy a comprehensive Sound and Audio design that would enhance the unapparelled ambience of the nightclub. PALM +AV-ICN Reports.
Nex Protection Technology

Located in Kalina, Mumbai, Toy-Room Mumbai is established on the premises of the vibrant and stylish Grand Hyatt, one of Mumbai's sophisticated leisure and business... read more

Articles Mar-Apr 2022

The CHORDFATHER   Experience   New!

Neumann's first Studio Monitor Experience Center in Mumbai
Nex Protection Technology

Recently Neumann in collaboration with well-known music composer, producer, sound engineer, and live engineer, Sunny M.R.'s Chordfather Productions announced the launch of its exclusive Studio Monitor Experience Center for audio professionals... read more

Articles Jan-Feb 2022

Understanding the Dynamic Evolution of Projection Technology with NEC New!

Humans have always wanted to bring their imagination to life. Introducing 2K / 4K projectors that deliver superior colors’ and high resolution has made that possible.
Nex Protection Technology

The high detail, true color rendition and cinema-like quality video of projectors are being leveraged by Artists, museums, schools and businesses alike to educate, attract and engage customers or to uplift and inspire people in new and innovative ways...... read more

Articles Jan-Feb 2022

Integrated System Design Crafts a Savvy Aural Experience Hot!

HARMAN Professional Solutions & ISD install a comprehensive Aural setup at Pass Code Hospitality newly opened restaurants.
Integrated System Design

When Pass Code Hospitality opened three new bustling restaurants in Lower Parel, Mumbai, they reached out to HARMAN Professional Solutions and Integrated System Design to deploy a comprehensive Aural setup that enhanced each restaurant's theme well....... read more

Articles Jan-Feb 2022

Star Dimensions India accomplishes STATE-OF-THE-ART- LIGHTING ARCHITECTURE for the "BANDRA WONDERLAND" project in Mumbai New!

Ashish Mehta & Becket Tundatil Creatively Execute Seamless Architectural Lighting Design at the Iconic Bandra-Worli Sea Link.
Bandra-Worli Sea

Between 24th December 2021 and 2nd January 2022, the project came alive as the sun set on the city - with the entire 1.5 km of the Bandra Reclamation promenade being engulfed in specially themed displays that emphasized the four different seasons of the year, boasting different eye-catching..... read more

Articles Jan-Feb 2022

Understanding the Pro-Audio Market with Sennheiser New!

Sennheiser is a leading manufacturer of headphones, loudspeakers, microphones, and wireless transmission systems and has been creating unique sound experiences for customers. PALM+ AV-ICN got in touch with Vipin Pungalia, Director, Sales - Pro Audio & Country Manager, Sennheiser - India, to learn more about the company's plans for the Indian market.
Vipin Pungalia Pro Audio Country Manager Sennheiser

The live music industry had seen a boom before the third wave of COVID stuck. What are the current industry sentiments, and do you think that the industry is poised to see a boom again? India has always been a music-loving country, for global as well as local artists..... read more


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Acoustic and Audio System Design for Small Rooms - Part 1

By - Rahul Sharma, CEO, Menura Acoustic Labs In collaboration with Sound Wizard





Acoustic and audio system design for a “small room” can be extremely challenging, especially for critical listening applications like control rooms and reference home cinemas. It is vital to understand the relationship between system design and acoustics, and to accept that neither aspect can be designed in isolation without considering the needs and requirements of the other. In this six part educational series, we will outline many important “small room” design considerations and along the way demonstrate how to effectively tackle common acoustical and system design problems


Small Rooms

Let us start by defining a “small” room, firstly so that you aren’t utterly disappointed at the end of the series, and secondly because understanding the distinction between small and large rooms is the key to digesting the completely different design approaches to both. In an attempt to keep theory to a minimum, lets just say that small rooms are those where the room boundaries are close enough to create modal issues in the lower frequencies. Extensive low frequency absorption is usually required, and since the first reflections of sound from room boundaries reach the listener extremely quickly, a great deal of care must be taken to prevent early reflections from colouring the direct signal. As a rule of thumb, a room whose largest dimension is under 20m or 65 ft can be considered to be a small room

In the first part of this series, we will focus on three basic acoustic and psychoacoustic phenomena whose understanding are critical to effective design; the Haas effect, comb filtering and phase shift.


Fig.1: The Haas Effect


Haas Effect

The simplest way to describe the Haas effect is through its other name, the precedence effect. If two sources of sound are separated in arrival time by less than approximately 40ms, they are perceived as one. Because of this, both sounds also appear to come from the same location, which ends up being the physical location from which the first sound reaches your ears. Because of this powerful psychoacoustic phenomenon, your brain locks into this physical location, and it then becomes very difficult for your brain to reset and convince itself that there are in fact two separate sources of sound in different locations.

Either the level of one has to be reduced significantly, or it has to be delayed by over 40ms. The implication of the Haas effect in small rooms is straight forward; your brain is unable to separate the direct signal from early reflections because the arrival times are too close together! Why is this bad? The short answer is comb filtering, but the concept of phase shift needs to be understood before we openthat can of worms.


Fig.2: Amplitude, Time Period and Frequency of a Wave


Phase Shift and Comb Filtering

As audio professionals, most of us are aware that every audible (and inaudibile) frequency has a corresponding wavelength. The time period defines the time it takes for one complete oscillation over that wavelength. While most audio signals are complex and never resemble a sine wave, we will still use one to illustrate our concept.

In the image below, two audio signals with the same amplitude (level), frequency response and wavelength BUT different arrival times have been added. Because of the different arrival times, the combination of constructive and destructive interference results in the “combing” you see in the image below. As you can imagine, this is not a desirable result.


Fig.3: Combing


The time delay created a phase shift in the wave, which combined with the original signal. Thanks to the Haas effect, this is the resultant wave we hear in a room. We sometimes mistakenly attribute the resultant wave to the audio system alone, when in fact it is a combination of the room and source. The colouration affects the spectral content of the sound waves, which goes against the main design goal of any listening space – transparency. The solution is to create a reflection-free zone, both through acoustic treatment and/or angling the walls of the listening room. Stay tuned as we dive deeper into acoustic and audio system design considerations for “small” rooms!

www.menuralabs.com

info@menuralabs.com

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