Astro Spatial Audio immerses The Band’s Visit in 3D sound

Astro Spatial Audio‘s object-based approach to immersive, three dimensional sound is being used in a critically acclaimed new musical that celebrates the deeply human ways music and laughter connect us.

Sound designer Kai Harada is responsible for the sound design for The Band’s Visit, which opened in November to rave reviews at the Barrymore Theatre on Broadway. It is the story of the Alexandria Ceremonial Police Orchestra’s arrival in Israel for the opening of an Arab Cultural Centre, only to find out that they have boarded the wrong bus to the wrong town, with amusing consequences.

At the heart of the Astro Spatial Audio (ASA) solution is the conversion of audio signals into audio objects. ASA’s SARA II Premium Rendering Engine – a 3U processor offering up to 128 MADI or 128 Dante configurable network pathways at 48kHz/24-bit resolution – uses extensive metadata attached to each audio object. The result is a precise calculation of that object’s position within virtual 3D space, processed in real-time up to 40 times per second for each individual object, as well as that object’s acoustic effect on the virtual space around it.

"In The Band’s Visit, several musicians play their instruments in a variety of locations on the stage, and it was incredibly important to me to preserve a transparent sound system design – in my opinion, the more we attracted attention to the sound system, the less the audience would connect with the actors and the story on stage, so natural-sounding reinforcement was the goal,” said Harada.

Harada’s associate, Josh Millican, drafted all the speaker positions in CAD, and when it was time to commission the system in SARA II the measurements were verified and the values simply entered.

"ASA allowed us to precisely place the instrument source as an audio object within a graphical interface, while it did all the calculations to make it sound correct,” Harada added. “Changes to staging were easily accommodated. In addition, having used other acoustic enhancement systems on other shows, I was eager to try the ASA room enhancement to give the illusion that the theatre was a larger acoustic space for some key moments in the show.

"Also, there were a number of very localised sound effects – coming from a prop radio, or a jukebox, or a baby – and although we had many wireless loudspeaker systems to play with, we used SARA II to reinforce the localisation through the main PA: the initial waveform comes from the practical loudspeaker, but SARA II ensures that the sound is localised correctly for all audience members."

All the stage band and practical sound effects inputs were routed, post-fader, from a Studer Vista 5 console into SARA II, where they were represented as audio objects; the Studer fired MIDI changes to QLab, which in turn fired OSC commands to SARA II to move between snapshots. SARA II’s outputs were routed back into the console and routed to the appropriate loudspeaker systems, which were then processed using Meyer Galileo units.

The production is configured with 162 mono inputs and 24 stereo inputs – which comprise a cast of 15 performers, four musicians that play in a purpose-built room under the stage, the five additional stage musicians (who also play in the room when they are not on stage) – totalling 68 band inputs, 26 playback (QLab) inputs, 36 SARA II returns into the console, and a host of reverb returns and utility channels. Reflecting the fact the Astro Spatial Audio is entirely brand agnostic, 90% of the loudspeakers used in the show are from Meyer Sound (M1D, LINA, UPJ-1P, UPJr, UPQ-1P, MM4, UPM-1P, UMS-1P, UPA-2P), with the rest from d&b audiotechnik with E5s as surrounds.

"The goal was not merely an immersive audio experience; the goal was a transparent audio experience, and I think we were very successful," said Harada. "Many people have commented about the quality of the audio on the show, and I am quite proud of it. I do believe we have achieved our goal of creating an intimate, organic-sounding show but still delivering dynamics when appropriate. The story is so human and conversational that we needed to preserve that feeling but still ensure that everyone in the audience had a very good aural experience.

Summing up his experience with Astro Spatial Audio, Harada concluded: ‘I think it’s a great tool – it is quick to set up and commission the system, which is Very important in an industry where time is very, very expensive. Having what are essentially two separate features: object-oriented audio and acoustic enhancement in one box is a great boon. Not having to manually calculate delay times to a given reference point was also a huge time-saver – just entering the x, y, z coordinates of the loudspeakers got us very close to having a functioning system in a short amount of time, and then we could spend the rest of the time listening and adjusting.