Event technology & fixed install
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Everyone loves a conference

Take a look at how Holoplot systems provide the best results for the best speakers while integrating seamlessly into the visual and technical background of a venue.




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.  

Key Facts

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 

Conventional set-up  

  • 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 

Holoplot set-up

  • 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.  

Holoplot Solution

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.   

Controlled Wavefronts 

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. 

Constant Volume  

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. 

Multiple beams 

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. 

Low feedback 

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. 

Hidden technology 

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. 

Holoplot impact

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 

New possibilities  

Multiple feeds, localized content beams, room segmentation  

Out in public

The poor acoustics of larger buildings require costly treatments with often many decentralized speakers and plenty of insulation. See how Holoplot delivers the best speech intelligibility faster and often even at lower costs.



Train Stations 

Deutsche Bahn is the largest railway operator and infrastructure owner in Europe with nearly two billion passengers every year. Frankfurt exists as one of Germany’s largest transportation hubs.  

Despite being the second most frequented train station in Germany and also the largest train station to serve a German airport, Frankfurt Central Train Station and Frankfurt Airport leave room for improvement when it comes to customer satisfaction especially in terms of effective communication. It’s not that the provider does not want to improve the situation, but the extremely challenging environment with large rooms, many reflecting surfaces, various noise sources and a vast amount of information that must be communicated prove to be difficult to master acoustically. 

Given the demanding acoustic environments of the Deutsche Bahn train stations, Holoplot’s task was to practically demonstrate how the new technology could improve the existing situation. As it stands, announcements are impossible to decipher with sound quality decreasing significantly by the meter.  

The goal was to reach a satisfactory level of speech intelligibility of at least >0.5 STI (Speech Transmission Index) and to demonstrate the unique capabilities of the Holoplot system.

Key Facts

Frankfurt Central Station  

  • Terminal Area: 7000m2  
  • Wide open space, 250m in length 
  • Intelligibility rating: 47/100  
  • Acoustic rating: 46/100 

Frankfurt Airport Train Station 

  • Platform length: 450m  
  • 4 Tracks 
  • Tunnel shaped with glass enclosure 

Conventional set-up  

  • A set of active or passive loudspeakers installed every 20m 
  • High amount of acoustic insulation panels across the ceilings and walls 

Holoplot set-up  

  • Central Station: 15 modules stacked on a tower in the terminal area, targeting 7,000m2 and 200m max distance 
  • Airport: 1 module placed every 60m on the platform 


One of the most acoustically problematic zones in the Frankfurt Central Train Station is the terminal area: Given the dense traffic, high roof structures and open sides to each platform where sound must travel across long distances and where sound is easily affected by distracting reflections, it is not surprising that in the previous testing of intelligibility and acoustics of the conventional speaker systems at Frankfurt Central Train Station, results were very low. At the Frankfurt Airport’s station for long distance travel, the acoustics of the underground platform also proved to be a notable issue due to the tunnel-shaped architecture and reflecting glass walls. 

Uncontrollable Sound 

All train stations are traditionally equipped with membrane or horn speakers. This conventional set-up offers spherical wave propagation, which is also less directional: Though the area of coverage includes a large radius, the wave remains uncontrollable. More modern installations sometimes use column speakers, which have an improved vertical wave propagation, but are especially horizontally still undirected and uncontrolled. The persistent issue is still as follows: 

  1. The intensity (volume) of the sound transmitted as a spherical wave by a speaker declines drastically: by half of its pressure level (-6 dB SPL) and even quartered in its intensity when traveling over a distance of twice the original measure. Because of this, the output volume must be raised to cover a wider distance. However, this is at the expense of the listener who is near to the speaker, to whom the sound will be uncomfortably loud. At the same time, a listener standing further away receives more of the indirect sound through reflections than the direct sound. 
  2. The simultaneous information distribution in all directions: Travelers on one platform still hear the broadcasts from other platforms, which is distracting and stressful. 

Distracting reflections 

Speech intelligibility is the relationship between direct sound coming directly from a source and reflections coming back from the environment. Train stations architecture is typically characterized by highly reflective surfaces (e.g. concrete floors and walls) as well as large expanses of glass. By the time the sound from a conventional system reaches an audience, it has already generated numerous reflections from the aforementioned surfaces, leading to a sharp decrease in speech intelligibility. In an environment where a clear transmission of information is essential, this is the constant problem for planners, and it is currently addressed with a dense network of speakers and costly insulation material.  

Multiple audio sources 

Additionally, train stations are characterized by a relatively high amount of different audio sources that are simultaneously communicating conflicting information to various audiences thereby multiplying all the problems described above. 

Holoplot Solution

Holoplot offers control over the sound wave propagation, using planar and focus waves in flexible combinations that are easy to configure. 


At the central station, multiple scenarios were run separately and  simultaneously: 

  1. Two different announcements (English & German) played in separate sound fields (25-40m distance to system) with little distance (2m) to each other simultaneously 
  2. Small sound fields (2m x 2m) targeting food stands at a distance of 50-60m played background music 
  3. 3m x 3m sound field at a 60° sharp angle between the system and the end of a platform targeted arriving travelers 
  4. 200 meter-long sound field between the system and the end of the terminal covered with consistent volume and intelligibility 

At the airport station, the goal was simply to deliver a high speech intelligibility across one side of a platform with little spillover to the other sides.  


During both installations, a customer survey and quantitative measurement of speech intelligibility (STI) were conducted by independent institutes. The STI measurement delivers a value between 0 and 1, with a score of 0-0.3 being incomprehensible and scores of 0.6-1 being good to very good intelligibility. Deutsche Bahn’s goal was to reach 0.5, which had previously proven to be a significant challenge. 


The results of the customer survey demonstrated an overwhelming improvement when it came to the sound quality and content intelligibility. 84% of surveyed people reported hearing “clearly better”, with an additional 14% of the people hearing “better” overall: In total,  98% of those surveyed noted there was an improvement over the conventional set-up. The system’s consistent volume (sound pressure level) was more than sufficient for a consistent sound along the entire length of the Central Station terminal and the airport platform with a difference of more than 12 dB between the inside and the outside of the beam’s target. Most impressive though were the speech intelligibility measurements, which presented consistent values from 0.88 at a distance of 25m to 0.75  at a distance of 200m from the system. Specifically interesting is the fact, that these remarkable results have been achieved without the additional use of absorption materials, which in the end has a significant impact on the profitability of a Holoplot system. The results clearly demonstrated the effectiveness of the Holoplot sound system in one of the most challenging environments, which can be applied to the future train stations in development and planning, as well as used to inform the client’s funding and resource allocation toward reaching their desired acoustics.

Holoplot impact

Improved acoustics

  • Acoustic ratings raised from 46/100 to 86/100 
  • Improvements made without any detailed planning or additional acoustic treatments such as insulation material 

Increased speech intelligibility (STI)  

  • Intelligibility Ratings raised from 47/100 to 87/100  
  • Quantitative measurements of STI ranged from 0.88 at 25m to 0.75 at 200m in both locations  
  • Subjective ratings endorsed these measurements with 84% of the customers describing it “clearly better”, as well as  14% of customers describing the difference as “better” (98% customers noted an improvement in total) 

Savings in installation and insulation material 

  • Savings of up to 40% in total investment costs projected for various train stations due to less technology, fewer installation costs, and less insulation material 


Going corporate

A brand experience extends beyond its visual impression and while a venue’s fit for corporate event may look great, they often struggle to accommodate high-quality audio. Take a look at how a Holoplot system sets the bar higher.



Corporate Events

A great corporate event is comprised of a constellation of unique moments, inspiring speeches and an overall high-quality impression that balances the brand with its product and service aspirations.  

Usually, the conference organizers choose their locations according to criteria such as aesthetics, accessibility, uniqueness, and size — the venue for a corporate event is seldom chosen with good acoustics in mind. Indeed, the importance of a venue’s acoustics often only becomes an important factor  as late as the final sound checks.  

Remarkable and unique venues – repurposed old factories, for example, or modern buildings – are often characterized by a high number of reflective surfaces like concrete walls, big windows, and wide open spaces, and they are therefore counterproductive for good intelligibility. In environments like these, providing a consistent and quality acoustic experience that matches the standard of the overall event becomes very challenging and often impossible. 

Holoplot provides an innovative solution that is easy to implement. 

Key Facts

Example venue layout  

  • Medium (1,500 m2) 
  • Large stage 
  • Big screen for the keynote presentation  
  • No special acoustic treatment (Including both ceiling and walls) 
  • Partial direct wave propagation characterized by long echoes that interrupt diffusion 
  • High reverberation time RT60 (time which is needed for a short sound event to fade by 60 dB) 

Conventional venue set-up 

  • Speakers positioned on both sides of stage (L/R) 
  • More powerful set-up is needed to transmit a higher sound level in order to achieve more direct sound (“drowning out” of the echo) in a highly-reflective space 
  • Direct sounds, but with an echo following afterwards 
  • Additional delay lines installed above the audience, which are mostly rigged from the ceiling in order to avoid reflections and deliver more direct sound to the audience 

Possible Holoplot set-up  

  • 15-20 modules (3 x 5 or 4 x 5) 
  • Centered and ideally rigged above the stage, seamlessly covered by a transparent sheet for example 
  • No additional delay lines 


Wave propagation & decreasing volume 

One of the main issues encountered in a venue like this is that the wave propagation of conventional loudspeakers (membrane or horn speakers) is more spherical, therefore creating an uncontrollable sound wave, with an intensity that significantly decreases with distance. 

Though speakers in a line array or column offer better vertical scaling, the issue of a sharp decline in intensity of the sound remains. For the speakers with spherical propagation, the energy splits up across a surface that is four times as broad, similar to the way that line arrays spread the energy two times across a surface. In practice, this means a noticeable drop in intensity. Line arrays already transmit better cylindrical waves, but they lose energy (about 3 dB) as the distance from the speaker is doubled.  

Reverberant Environment and High Field Diffusion 

Another challenge that comes with a conventional set-up is the environmental reverb, along with the high field diffusion. 

Due to the wave propagation described above, the distance between the audience and the speakers correlates with less direct sound and more reflections. For example, in a smaller room with of only 800m3, an audio signal is already producing up to 200,000 reflections in just one second, which are then bounced back and multiplied throughout the room. This produces a dense field diffusion and a significant decrease in speech intelligibility as measured by the relationship between direct sound and its reflections. 

These two challenges result in the common dilemma that audio engineers face: The first rows hear everything a bit too loudly while the last rows barely understand anything.  

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.  

Holoplot Solution

The Holoplot Orion achieved a pleasantly consistent level of sound and an outstanding flexibility with regards to vertical and horizontal scaling. The modules are best situated in front of an audience where they can easily be covered behind an audio transparent cloth or projection screen, effectively concealing the set-up. In contrast to conventional sound-system technologies, this cover has very little impact on the result of the Holoplot system due to the nature of the sound waves that the Holoplot system generates. 

Constant volume & quality 

The Holoplot system overcomes the issues presented by large venues with bad acoustics due to system’s ability to control the propagation of sound waves that is accomplished by using planar waves and partitioned sound fields. 

The planar wave achieves a constant sound pressure intensity, ensuring equal audio quality and very consistent volume across space—even across long distances of 100m or more.  

Furthermore, planar waves are confined on all sides, allowing them to create precise vertical and horizontal scaling across the targeted sound field, which can be tailored to fit the distribution of the audience and thereby minimizes unwanted reflections from the ceiling and floor. This guarantees an outstanding level of speech intelligibility even in challenging environments, as is often the case at corporate events. 

Individual sound fields, individual feeds 

Holoplot creates and partitions sound fields using its precise beam-steering capabilities to divide a room into discrete sections. A single centralized system can thereby transmit multiple audio feeds simultaneously to a set of localized audiences. Each beam can also be trimmed and scaled to meet location-based specifications, allowing an audio engineer to configure a perfect sound field within a room to best fit an audience’s distribution and position in terms of size and height. Individual modifications in each beam’s volume and EQ settings afford complex acoustic-led experiences to meet the demands of idiosyncratic seating arrangements and venues. The beam-steering capabilities also allow for localized translation feeds in lieu of bulky headsets or monitors, offering a more organic integration of participants from around the world. 

Holoplot impact

Less feedback, more peace of mind. Given the very low feedback level of a Holoplot system, audio engineers and conference presenters can reclaim their peace of mind, as both the setup time and the risk of unwanted noise during a high-class event are significantly reduced. 

Minimize noise pollution 

Less insulation not only reduces the cost of installation but also maintains the clean visual presentation and atmosphere of the venue. 

Great flexibility  

One central system offers a wide range of possibilities in terms of precision and control of sound waves. 

Best speech intelligibility  

Consistent volume and quality across a wide audience and even in environments characterized by noticeable echo and a wide field diffusion.

Improved aesthetic 

Numerous truss/pipe constructions are required to install delay lines and to rig line arrays. central system reduces the visual distractions present in a venue. 

Wider possibilities  

Simultaneous streaming of different feeds (e.g. in different languages) in one room.

Broader horizons and new experiences

Creative expression requires great flexibility. Holoplot products offer new solutions and push the boundaries to broader horizons, while integrating seamlessly with visual and technical backgrounds.




Creativity means breaking past boundaries, surprising audiences and realizing new experiences. But when translating a concept into a reality, artists and creatives often realize that their ideas are constrained by the limits of technology. When it comes to audio, artists haven’t had much room for experimentation in the past, which is why many installations that incorporate audio rely on headphones as they provide more control, and offer a more personal experience. 

Holoplot’s radical new product enables creative to expand their practices past conventional boundaries and explore new frontiers. The system also solves acoustic problems and overcomes the restrictions of an exhibition’s site. 

Key Facts

Example room layout  

  • Small (80m2) to medium (300m2) rooms  
  • Challenging acoustics due to reflecting surfaces 
  • Reverb resulting in low speech intelligibility 

Desired effects

  • Direct wave propagation across shorter distances 
  • Directional focus on several spots inside a room 
  • Crafting a specific atmosphere (“traveling sound”)  

Conventional venue set-up 

  • Several speakers distributed throughout a space 
  • Sounds of motion created by panning in a set-up of ring speakers 
  • Requires effort to conceal speakers 

Possible Holoplot set-ups  

  • Centered on the ceiling (rigged) so that multiple locactions in the room can be reached 
  • Upright on a side wall so specific beams can point on walls or corner to anticipate reflections 
  • Can be set up as an entire wall (e.g. 3m x 4m) or split and placed in different areas to offer more control with regards to the different zones, thereby creating moving sounds fields 


Wave propagation  

Creating soundscapes is one of the most common issues when working with audio: The propagation of the sound wave. With conventional speakers, the waves generated are always spherical, which means they flow in every direction and remain uncontrollable. To correct for this, multiple speakers are sometimes installed with each speaker targeting a small spot within a short distance with less intensity. However, an acoustic partitioning of different sound fields is almost impossible and includes many of fine adjustments with regards to the volume of each speaker and their transmission angle. Additionally, simultaneous feeds only generate a cacophony. 

Complex set-ufor immersive sound 

With conventional speakers, creating immersive soundscapes requires a set-up involving many loudspeakers distributed across a wide space, thereby complicating the installation and production process. It’s difficult to use or even create symmetrical sound sources as a speaker often has to be placed exactly at the position where a reflection/echo should be imitated. This not only adds to the cost of an installation but also increases the potential for failure. 

Visible Audio Technology  

Sound systems with multiple speakers are visually cluttered and distracting. Concealing a complex set-up has become a common challenge. 

Distant sounds 

Even the most immersive sound installations suffer from the same problem: The audio source will always seem obvious to the listener. A feeling of proximity to objects–moving or static–can’t be affected even with the best set-up due to the nature of the technology behind speakers. This makes it very hard for artists to create a connection between the audience and the audio and to replicate authentic experiences.  

Holoplot Solution

Holoplot opens a new world for creativity and allows audio engineers to rethink what is possible with audio. This opens doors for multiple creative solutions from multi-feed spaces, fragmented sonic experiences and immersive events.  

Create various sound zones 

With its precise beam-based capabilities, Holoplot creates multiple separated and discrete sound fields in which audio is limited to certain parts of the room, with almost no overlap. This makes it possible for the audience to walk in and out of an experience—a change that sometimes covers only a few centimeters. 

True immersive experience & new room acoustics 

Based on wave field synthesis, Holoplot has the unique capacity to authentically change the acoustics of a room by creating a different acoustic environments with reflections, reverb, and direct sound. The unique acoustics of a famous concert hall, for example, or the devotional tone of a Roman church and the immersive calls of a tropical forest can be genuinely recreated with high precision. These acoustic environments offer possibilities past the boundaries of most physical spaces; these configurations don’t require an insulated playback room to avoid distracting reflections. Instead, the hard reflecting surfaces are used to create this immersive experience. This immersive approach can be applied to many venues including museums or galleries. 

Listen to the source, not the system 

Given the precise distribution of sound, the Holoplot system’s location is imperceptible. Instead, the system offers an audio engineer full control over the propagation of sound waves: Targeted waves and reflection, for example, can impart the sense that the speakers are embedded anywhere in the room—a striking capability when creating immersive experiences. 

Real life experiences through proximity 

The most striking feature for creative installations is the ability to impart the feeling of proximity to a sound source: With the Holoplot system, a listener can be made to feel like  something is happening very close to them while other listeners are exposed to entirely different audio feeds at the same time and in the same room: Bringing a humming bee close to a listener’s face or whispering in someone’s ear becomes entirely possible, thereby allowing truly unique installations and hyper-realistic experiences.   


Holoplot impact

Wave propagation control  

Strong control over wave propagation, including the possibility to partition a room into localized discrete areas 

Immersive soundscape

The bounds of a room is no longer a barrier: They can be used as tools in an immersive space 

Innovation & creativity   

Surprising and revolutionary immersive experiences  


Conceal and integrate the gear seamlessly in the installation 


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