The Holoplot Orion series revolutionises the experience of sound in general, by providing an unmatched level of speech intelligibility even across larger rooms (1,500–3,000 m2). As conferences aim to provide compelling, engaging, and interesting information to attendants, clear and consistent speech intelligibility across all part of a space is key to a conference’s success.
Exemplary conference venue layout
- Room measurements: 35m x 70m x 12m (WxLxH)
- Large stage
- Big screen for the keynote presentation
- Acoustic paneling on the ceiling
- Side walls with minimal reflecting surfaces (few windows)
- Carpeted flooring
- Loudspeakers installed on both sides of the stage (L/R or L/C/R set-up)
- Additional delay line speakers placed above the audience every 30 meters from the stage
- Monitor speakers
- 15–20 modules (5 x 3 or 5 x 4) centered behind or next to the stage (splitted or as one system)
- Rigged and covered by a large screen for seamless integration (optional)
- No delay lines
Wave propagation & decreasing volume
The wave propagation of conventional loudspeakers (i.e. membrane or horn speakers) is more spherical, which also means that the wave propagation is less directional. The waves generated can cover a wide angle, but their scope remains uncontrollable. Additionally, even with line arrays that offer better vertical scaling, the intensity of the audio feed still quickly declines. Moreover, line arrays transmit cylindrical waves that are reduced to half of their original intensity when traveling twice the original distance due to a pressure level decrease of about -3 dB. It is a classic challenge for audio engineers: While the first row hears everything a bit too loud, the last row has trouble hearing anything.
To avoid this, several speakers are usually installed above the audience to create a delay line. However, in addition to the extra material and installation costs incurred when installing a denser speaker set-up, playing back different content or fine-tuning specific points within an audience is impossible due to the wide radius that most speakers serve.
Visible audio technology
Conventional audio set-ups also come with another challenge: The visibility of multiple speakers as well as the supporting infrastructure. Concealing the audio equipment is often a difficult undertaking, and conference rooms often look cluttered with technology—a distraction from the main event.
The feedback between a speaker, microphones, monitor and volume controller remains an issue in many cases. As conference schedules tighten, there is even less time for the audio engineer to perfect the necessary fine-tuning.
Use of translation headphones
Conventional conference set-ups only facilitate the streaming of content in one language at a time. However, to cater to an international group and stream multiple feeds in different languages, the set-up would require a cumbersome handling of headphones, which are uncomfortable to wear, costly to distribute and isolate the listener from the general atmosphere of the event.
In this conference set-up, a Holoplot Orion system of 4 x 4 modules would create a pleasant and consistent level of sound along with a convincing latitude leverage with regards to vertical and horizontal scaling. The modules would be located in front of the audience; directly behind or next to the stage and covered with a white perforated projection screen, which allows the speaker system to integrate visual and audio feeds seamlessly across one location.
One of the most prominent advantages of Holoplot systems is the unmatched control over the propagation of sound waves. Holoplot uses planar and focus waves in flexible combinations that are easy to implement, allowing for precise projections of sound to the select locations while nullifying acoustically negative elements (e.g. reflecting surfaces). Unnecessary reflections are avoided and the level of direct sound is increased dramatically, leading to an unmatched speech intelligibility even across wider distances.
With a planar wave, maintaining consistent intensity and pressure levels (SPL) over distance is viable: The volume perceived in the furthest corner of the room remains almost exactly the same as at the front of the stage. It also allows for a very high level of flexibility within the sound field, where sound waves can be either limited and precisely directed to a defined space, or where they can be transmitted broadly with an equal audio quality and consistent volume throughout the entirety of a room.
Due to the confined sound fields, rooms can also be partitioned into separate acoustic sections with even and discrete audio content sent from the same Holoplot system simultaneously. This enables the transmission of multiple feeds to different locations at the same time with very little overlap. Each audio beam can be pointed to a specific location with high precision, allowing the audio engineer to configure sound fields within a room at the perfect position and height for the audience. This capacity also eliminates the need for translation headphones: The respective audio content for each group in the audience can be easily localized.
The Holoplot system generates a naturally low level of feedback so presenters at a conference can move in front of the system without risking a feedback signal. Additionally, speakers will not be distracted by their own voice due to the system’s very low latency. With audio engineers at ease, this also allows for new types of installations.
Conventional systems can’t be hidden behind a screen as a screen would incur a noticeable loss in frequency and energy, or create vibrations of the screen itself as the concentrated spherical sound wave can’t move through the small holes in most materials. Holoplot provides a perfect solution for concealing gear, as Holoplot systems can be integrated behind an audio transparent screen or cloth without losing performance or quality. The system’s specific sound waves don’t interfere with the material, moving through screens seamlessly.
Take the driver seat
The user controls the sound — not the other way around
Best speech intelligibility (STI)
Crystal clear content, regardless of how challenging an environment
No visible technology
Seamlessly conceal the system in your set-up
Multiple feeds, localized content beams, room segmentation