Audio applications
Fohhn Audio Solutions
FOHHNPublic

Public Spaces

Civic halls, council chambers and public buildings where every word is recorded and scrutinised.

Mic channels
40 – 300
Gain before FB
+6 dB
Finish
Custom RAL
The acoustic challenge
  • Hundreds of open microphones in one reverberant chamber.
  • Proceedings are recorded and broadcast — the record must be clean.
  • Heritage or civic interiors restrict every fixing point.
The CaesarTechs engineering approach
  • Tight beams aimed at delegates and public gallery, away from microphone positions.
  • Automixing DSP with per-position gain structure.
  • Recording and broadcast feeds derived from the same processing core.
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Recommended system

The stack we would specify for this environment.

Loudspeaker families
Linea Focus · X Series
Amplification & DSP
System Amplifier DI-4.500
Beam steering strategy
Narrow beams away from open microphones
Feedback margin

Beams engineered around the microphone plan.

Clean record

Broadcast-quality feeds by design.

Respectful

Hardware that suits a civic interior.

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Integration scope
01

Custom finishes and concealed fixings for civic interiors

02

Interfaced with the conference and voting system

03

Documented commissioning file for the record

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Visual reference

How it looks in the space.

Public Spaces audio integration reference 1
Public Spaces audio integration reference 2
Public Spaces audio integration reference 3
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Acoustic telemetry

The numbers behind the design.

Reverberation decay · RT60 2.4s
0 dB-60 dB
STI (predicted)
0.84
Direct / reverb
66%
SPL variance
± 3.4 dB
Throw distance
24 m
Vertical dispersion
Beam angle
-22°
Opening
12°
Mount height
10 m
Steering
Digital
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Signal chain

Microphones, UC codecs, media players and the emergency interface arrive on a redundant network layer with priority routing.

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Zone planner

Select the zones in your public project.

Zones selected
3
Beam channels
5
Amplifier estimate
2 × DI-4.500
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Coverage simulator

Pre-loaded with typical public room data.

Adjust the room, steer the beam and export a branded coverage study for your project file.

Select the space
Scale

Open civic area with facade reflections and traffic noise. Tight vertical control keeps sound off neighbouring buildings.

ViewCovered 33/132 · marginal 22
7.0 m25.9 m
Conventional loudspeaker — same room
7.0 m25.9 m44 m × 30 m × 12 m · Public space / plazaDesign simulation — estimated coverage, not a measurement

Click any listening position to move the virtual listener · drag the array to change mounting height · every value is a design estimate until site measurement.

Room geometry · Public space / plaza

Showing the parameters that matter most for a public space. Switch to “Build my room” for the full geometry set.

LayersSeats covered 6/14 · drag the array, beam handle or listener
Conventional loudspeaker

Fixed vertical dispersion sprays energy at ceilings and rear walls. Reflections smear consonants.

Fohhn Beam Steering
5m10m14m19m24m-22°6.5m87 dB · 15m

Drag the array to set mounting height, drag the handle to steer, drag anywhere to move the listener.

Live acoustic telemetry
1 beam12° coverageRT60 2.4s45 dB(A)Beam locked
0 m24 mSteered line source — 3 dB / doublingConventional — 6 dB / doubling
STI gain
+37
D/R
10.2 dB
Uniformity
±2 dB
Coverage profile along the audience
Front to rear · 24 m · 1 beam at -22° / 12°
88 dB
86 dB
84 dB
83 dB
82 dB
81 dB
88 dB
87 dB
87 dB
86 dB
86 dB
85 dB
78 dB
78 dB
0 m12 m24 m
Beam steered Conventional
Front-to-rear variation
±5.4 dB
Conventional variation
±10.8 dB
Rear headroom over noise
+33 dB
Array mouth / ceiling
6.5 m of 10 m
Suggested family
Linea Focus
Amplification
System Amplifier DI-2.250

Steered energy holds level across the seating plane instead of falling away behind the first rows — indicative design estimate, not a measurement.

Live audition · hear the configuration

Real programme material — a recorded announcement, a music bed or a pink-noise test signal — played through the current room, beam and noise settings.

Audition idle
Direct / reverberant
+6.0 dB
Room decay in ear
2.4 s RT60
Noise floor
45 dB(A)

Beam on the listener at 15 m — direct sound stays forward of the room tail, articulation holds at STI 0.88. Indicative sound design simulation, not a measurement or a Fohhn recording.

Dolby surround test

Channel-by-channel identification for a 5.1 / Atmos room. Tap any speaker to fire that channel, or run the full sweep.

Listener

Output routing is detected on first playback.

Live simulation
Conventional STI
0.51
Beam steered STI
0.88
Direct / reverberant
10.2 dB
Suggested family
Linea Focus
SPL at listener
87 dB
Headroom over noise
+42 dB

Beam locked on the listener — approx. +37 points of speech-intelligibility improvement versus a conventional system in the same room.

Drag inside the steered room to move the listener. Indicative simulation — not a measurement of a specific project.

Engineering study · project record
Engineering notes · auto-generated, editable

Design simulation — estimated performance until site measurement

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Typical project profile
Council chamber
Delegate and gallery beam separation
Civic hall
Multi-purpose presets for events and sessions
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Delivery program
PHASE 01
Acoustic survey

Site measurement of RT60, noise floor and geometry against the architect's model.

PHASE 02
Coverage modelling

Beam plots per zone with predicted STI and SPL maps issued as a report.

PHASE 03
Design & BOM

Loudspeaker schedule, amplifier count, cabling and containment drawn in CAD.

PHASE 04
Supply & staging

Equipment pre-configured and load-tested in the CaesarTechs facility.

PHASE 05
Installation

Mounting details coordinated with the fit-out contractor and MEP package.

PHASE 06
Commissioning & handover

On-site tuning, as-built documentation, operator training and remote monitoring.

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Engineering questions

We model the room in acoustic software and issue beam plots with predicted STI for every zone of the public space before a single bracket is ordered.

Yes. Beams are steered digitally, so re-tuning after a fit-out change is a software session — no ladders, no re-rigging.

Slim column profiles in custom finishes, flush or recessed where the architecture allows. Most clients see nothing at first glance.

The DSP core supports prioritised emergency broadcast paths and supervised monitoring alongside the everyday program audio.

CaesarTechs provides remote monitoring, firmware management and an SLA-backed response with local engineers.

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Other audio environments
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Let's design the audio for your public project.

Share your drawings and we will return a coverage plan, a bill of materials and a commissioning scope.

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