What Marshall Day Acoustics does

Marshall Day Acoustics is a private Australian acoustic consulting firm founded in 1981 by Chris Day and Sir Harold Marshall, specializing in architectural acoustics, environmental noise and vibration assessment, and room acoustic design. The firm employs 90+ professional staff across offices in Australia (Melbourne, Sydney, Perth), New Zealand (Auckland, Christchurch, Hamilton), and France, with project work extending to more than 15 countries. Its client base spans renewable energy developers (Hornsdale Wind Farm, Collector Wind Farm, Fulham Solar Farm with BESS), government and defence (Australian Department of Defence F-35A and Pilatus PC-21 noise work), transportation infrastructure (East West Link), cultural venues (Philharmonie de Paris, Guangzhou Opera House), and large real estate developments (Sekisui House's 1,800-lot Hermitage community, Pacific Bondi Beach).

The firm's technical stack includes proprietary acoustic analysis software (INSUL and Zorba, developed by Keith Ballagh and sold in 30+ countries) and the Iris 3D room acoustic measurement system. It also holds distribution and technical support rights for SoundPLAN noise modeling software in Australia and New Zealand, and operates The Listening Room—an immersive VR demonstration facility at its Auckland office. These assets complement its core consulting practice rather than constituting a standalone software product business.

Revenue is generated through project-based professional consulting engagements, with pricing determined by project scope, complexity, and duration under no publicly disclosed rate card. The firm sells directly to enterprise and government clients through a referral-driven, reputation-led model, with marketing concentrated in research publications, conference presentations, and a curated project portfolio. There is no external funding, no private equity investment, and no public ticker; the company is led by CEO Christophe Delaire (MDA Australia) and Managing Principal Malcolm Dunn (New Zealand). In 2025, the firm closed its Hong Kong and Shanghai offices and opened a new Auckland CBD office, signaling a geographic rebalancing toward its core ANZ base.

Name

Marshall Day Acoustics

Legal name

Marshall Day Acoustics Pty Ltd

Website

https://marshallday.com

Company type

Private

Founded year

1981

Operating status

Operating

Headcount range

51–100 employees

Short description

Marshall Day Acoustics is a private Australian acoustic consulting firm founded in 1981, providing architectural acoustics, environmental noise, and vibration assessment services across 15+ countries to renewable energy, infrastructure, defence, real estate, and cultural venue clients.

Ownership category

akta.pro rank

Product category

Acoustic Consulting Services

NAICS

Management, Scientific, and Technical Consulting Services (5416)

SIC

Services-Commercial Physical & Biological Research (8731)

akta.pro primary industry

Acoustic & Soundproofing Works (IMAFANAL)

akta.pro secondary industry

Noise & Vibration Control for HVAC (Silencers/Isolation) (IMADANAL)

Keywords

• Acoustic consulting services
• Architectural acoustics design
• Environmental noise assessment
• Vibration impact analysis
• Room acoustic design

Headquarters

HQ city

Collingwood

HQ country

Australia

HQ region

Oceania

Offices8 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales

Revenue model

1. Professional Consulting Services: Marshall Day Acoustics generates revenue through providing specialized acoustic consulting services to clients across architectural, environmental, industrial, and infrastructure sectors. Projects range from small developments to large-scale infrastructure, with services including noise assessments, room acoustic design, and compliance monitoring.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

Marshall Day Acoustics provides professional acoustic consulting services including architectural acoustics, environmental noise and vibration assessment, and room acoustic design. The firm delivers acoustic design and advisory work for projects ranging from small developments to large-scale infrastructure across concert halls, wind farms, transport infrastructure, defence facilities, and commercial developments.

Product overview

Marshall Day Acoustics is a professional consulting firm offering acoustic design and advisory services rather than a software product company. Their core offering is architectural acoustics and environmental noise and vibration consultancy, delivered through expert consulting engagements. They provide specialized services including SoundPLAN noise modelling software support and The Listening Room—a VR demonstration facility for acoustic environments. The firm serves diverse sectors including performing arts venues, renewable energy (wind farms, solar farms), transport infrastructure, defence, and commercial developments across Australia, New Zealand, and Asia.

Differentiator

Problem solved

Functional benefit

Products and services

• Acoustic Consulting Services Architectural acoustics and environmental noise and vibration consultancy delivered to a range of industries and sectors, including concert halls, wind farms, and infrastructure projects. Services span small developments to very large-scale infrastructure across more than 15 countries.
• SoundPLAN Support Technical support and sales assistance for SoundPLAN noise modelling software, provided to users throughout Australia and New Zealand. Marshall Day Acoustics serves as the regional support partner for SoundPLAN with staff on the SoundPLAN support team.
• The Listening Room Immersive VR demonstrations of acoustic and vibration environments, available at the Auckland office for client demonstrations of acoustic design outcomes.

Quantifiable outcome

• Hornsdale Wind Farm - 315 MW operational facility with full noise compliance achieved
• +2 more outcomes

Named customers10 records

Segments6 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Scale indicators4 records

Recent moves7 records

Expansion highlights6 records

Direct peers

• Nagata Acoustics: Japan-based acoustic consultancy renowned for concert hall acoustic design worldwide. Most direct competitor to MDA's signature concert hall and cultural venue work; both firms compete for elite international performing arts center commissions.
• Acentech: US-based independent acoustic consulting firm providing architectural acoustics, environmental noise, and vibration services. Closely comparable to Marshall Day Acoustics in boutique consultancy model, service offering, and project types across commercial, cultural, and infrastructure sectors.
• Kirkegaard Associates: US-based acoustic consulting firm specializing in architectural acoustics, particularly concert halls and performance venues. Direct peer to MDA's cultural venue work (Philharmonie de Paris, Christchurch Town Hall) and competes for high-prestige acoustics projects globally.
• Bickerdike Allen Partners: UK-based acoustic consultancy specializing in architectural acoustics, environmental noise, and building services noise control. Directly comparable to Marshall Day in service offering, project types, and boutique consultancy model. Mentioned as a previous employer of MDA's Christchurch Senior Consultant.
• Müller-BBM: Germany-based acoustic consultancy and engineering firm with strong expertise in building acoustics, environmental noise, and concert hall design. Closely comparable to MDA in technical depth, project portfolio, and presence in cultural venue acoustics.
• Sandy Brown Associates: UK-based independent acoustic consultancy offering architectural acoustics, environmental noise, and audio/video design. Direct peer to Marshall Day in service mix and client types (developers, architects, venues). MDA's Christchurch senior consultant previously worked at Sandy Brown.

Broad incumbents

• SLR Consulting: Global environmental and advisory consulting firm with noise and vibration assessment capabilities. Comparable to MDA's environmental noise and renewable energy (wind farm) practice but with broader environmental consulting scope and a wider international footprint.
• AECOM Acoustics: AECOM is a global infrastructure consulting firm with an environmental acoustics practice covering transport, buildings, and environmental impact assessment. Like WSP, competes with MDA in environmental noise and infrastructure projects but within a broader multi-disciplinary portfolio.
• Arup Acoustics: Arup is a global engineering and design consultancy with a substantial acoustics practice serving built environment, infrastructure, and transport projects. Highly comparable to Marshall Day Acoustics in architectural acoustics, environmental noise, and concert hall design, but operates as part of a much broader multi-disciplinary firm.
• WSP Acoustics: WSP is a major global engineering consultancy with an acoustics practice covering transport, environmental, and building acoustics. Comparable to MDA in scope of services but operates as part of a much larger professional services firm with broader geographic reach.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/MARSHALL_DAY
• Facebookfacebook.com/217044665026256
• LinkedInlinkedin.com/company/marshall-day-acoustics

Revenue estimate

Valuation estimate

Number of profiles

Profiles12 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Marshall Day Acoustics