Grason-Stadler

What Grason-Stadler does

Grason-Stadler (GSI), founded in 1949 by Rufus Grason and Steven Stadler and headquartered in Eden Prairie, Minnesota, is a privately held medical device manufacturer specializing in audiometric diagnostic and screening instrumentation. The company designs and produces clinical and screening audiometers, tympanometers, otoacoustic emissions (OAE) devices, and evoked potentials systems, together with supporting data management software. Key products include the AudioStar Pro and Pello clinical audiometers, the TympStar Pro middle-ear analyzer, the GSI Corti OAE device, the Audera Pro evoked potentials system, the Novus newborn screener, and the AMTAS automated audiometry platform. Devices are designed as stand-alone units that can also connect to EMR/EHR systems via GSI Suite (Noah-compatible) and the cloud-based GSI Cloud platform. The company operates under ISO 13485 quality systems and complies with sector standards including ANSI S3.6, IEC 60645-1, and IEC 60601-1.

GSI serves hearing healthcare professionals through a horizontal segmentation approach across clinical audiologists (primary segment), hospitals and medical centers, schools and educational institutions, Veterans Affairs clinics, and university research facilities. All international sales are routed through an exclusive worldwide distributor network spanning more than 100 offices across 70+ countries, supported by clinical education content, continuing-education courses, and presence at major industry events (AAA, ASHA, EHDI, JDVAC, AAO-HNSF, HEAL, IFOS). Revenue is generated primarily through hardware sales, with software (AMTAS, GSI Suite, GSI Cloud) licensed either bundled with hardware or separately; pricing is not publicly disclosed and is obtained via a "Request a Quote" system that connects customers with their local distributor. Grason-Stadler is privately held with no disclosed institutional investors, parent company, or funding history.

Name

Grason-Stadler

Legal name

Grason-Stadler Inc.

Website

https://grason-stadler.com

Company type

Private

Founded year

1949

Operating status

Operating

Headcount range

101–250 employees

Short description

Grason-Stadler is a privately held U.S. medical device manufacturer founded in 1949 that designs, produces, and globally distributes audiometric diagnostic and screening instrumentation—including audiometers, tympanometers, OAE devices, and evoked potentials systems—for clinical audiologists, hospitals, schools, VA clinics, and research facilities through an exclusive worldwide distributor network.

Ownership category

akta.pro rank

Product category

Audiometric Diagnostic Equipment

NAICS

Electromedical and Electrotherapeutic Apparatus Manufacturing (334510), Surgical and Medical Instrument Manufacturing (339112)

SIC

Surgical & Medical Instruments & Apparatus (3841), Electromedical & Electrotherapeutic Apparatus (3845)

akta.pro primary industry

Audiology & Hearing Diagnostic Centers (HLAFAKAH)

Keywords

• Audiometric assessment equipment
• Clinical audiometers
• Tympanometry instruments
• Otoacoustic emissions devices
• Evoked potentials systems

Headquarters

HQ city

Eden Prairie

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Operations, Supply Chain, Personnel, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Audiometric Equipment Sales: Sale of diagnostic and screening audiometric equipment including audiometers, tympanometers, OAE instruments, and evoked potential systems. Products are sold through a global network of exclusive distributors in over 70 countries.
2. Software Licenses: Software solutions including GSI AMTAS (Pro and Flex), GSI Suite, and GSI Cloud for automated audiometry and data management. Software is bundled with hardware or sold separately.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels6 records

Core offering

Grason-Stadler designs, manufactures, and distributes audiometric assessment instrumentation for hearing healthcare professionals worldwide. Its product portfolio spans the complete audiometric test battery including clinical and screening audiometers, tympanometers, otoacoustic emissions (OAE) devices, and evoked potentials systems, complemented by proprietary software (GSI Suite, GSI AMTAS, GSI Cloud) for automated audiometry and EMR/EHR-compatible data management. Products are sold exclusively through a global network of more than 100 distributor offices across over 70 countries and supported for the product lifecycle with consultation, installation, and calibration services.

Product overview

Grason-Stadler (GSI) offers a comprehensive portfolio of audiometric assessment instrumentation for hearing healthcare professionals. The product line spans multiple device categories: diagnostic audiometers (AudioStar Pro, GSI Pello), screening audiometers (GSI 18), automated audiometry solutions (GSI AMTAS Pro and AMTAS Flex), clinical tympanometers (TympStar Pro), screening tympanometers (Allegro, GSI 39), otoacoustic emissions devices (GSI Corti), evoked potential systems (Audera Pro, GSI Novus), and supporting software (GSI Suite, GSI Cloud). The architecture follows a device-plus-software model where clinical instruments connect to proprietary data management platforms for EMR/EHR integration and cloud-based data storage. Recent innovations include the ACT (Audible Contrast Threshold) speech-in-noise test and automated patient-directed testing through AMTAS.

Differentiator

Problem solved

Functional benefit

Products and services

• AudioStar Pro A clinical two-channel audiometer that replaced the GSI 61, featuring ergonomic design and one-button, one-function navigation for comprehensive manual and automated audiometry testing. Used by clinical audiologists for diagnostic audiometry, hearing aid verification, and speech-in-noise assessment (with ACT/Speech Plus license).
• GSI Pello An adaptable mid-level audiometer that is portable, stand-alone, and PC-enabled, customizable for growing practices. Available with a Speech Plus license enabling the ACT speech-in-noise test. Used by audiologists in private practices and smaller clinics needing flexible audiometry.
• GSI 18 A portable screening audiometer with three stimulus options (steady, pulsed, FM) and two transducer choices (DD45 supra-aural headphones, EAR 3A insert phones). Operates on AC power or battery for up to 10 hours. Used for hearing screening in occupational health, schools, and industrial settings.
• GSI AMTAS Pro Diagnostic automated audiometry software operated through a touch screen computer connected to a compatible GSI audiometer (AudioStar Pro or Pello). Provides air/bone conduction testing with masking and speech SRT/WRS testing with masking. Used by audiologists seeking validated patient-directed automated testing to manage patient load.
• GSI AMTAS Flex Tablet-based automated audiometry software requiring no separate audiometer, offering screening and diagnostic air conduction testing with six quality indicators. Configured on Windows tablets with calibrated headphones. Used for portable automated screening and diagnostic audiometry without requiring a full clinical audiometer setup.
• TympStar Pro A clinical tympanometer offering comprehensive middle ear testing including tympanometry with multiple probe tones, Y/B/G immittance, reflex threshold testing, reflex decay, ARLT, Multi Hz, and ETF tests. Used by clinical audiologists and ENT specialists for comprehensive middle ear assessment.
• Allegro A handheld screening tympanometer capable of performing tympanometry and ipsilateral reflex testing on the go, designed for portability and ease of use. Used for portable middle ear screening in pediatric settings, schools, and field screening programs.
• GSI 39 A flexible combination screening device for tympanometry with options to add audiometry testing, available in five versions to meet varying facility demands. Used by clinics and screening programs needing a combined tympanometry/audiometry screening device.
• GSI Corti A portable OAE testing device offering DPOAE and TEOAE tests with pre-defined and user-defined protocols. Suitable for infants, children, and adults for screening and clinical applications. Used by audiologists, hospitals, and pediatric programs for otoacoustic emissions assessment.
• Audera Pro A clinical evoked potentials system also capable of otoacoustic emissions testing, positioned as the next generation to the GSI Audera. Provides significant updates for busy clinical practices. Used by clinical audiologists, hospitals, and specialty clinics for evoked potentials assessment.
• GSI Novus A newborn hearing screening device capable of performing AABR (Automated Auditory Brainstem Response) and OAE testing for early hearing detection in infants. Used by hospitals, birthing centers, and pediatric audiology programs for newborn hearing screening.
• GSI Suite Proprietary audiometric data management software that is Noah-compatible, enabling EMR/EHR data transfer. Provides quick and accurate capturing, saving, and sharing of patient information with direct print capability and session storage. Used by clinical audiologists and hearing clinics for data management and EMR/EHR integration.
• GSI Video Otoscope Video otoscope device that captures otoscopic images and integrates them into GSI AMTAS automated audiometry reports, with workflow guidance for technicians completing otoscopy during an AMTAS session. Used by audiologists performing automated audiometry who need otoscopic documentation within the audiometry workflow.

Quantifiable outcome

• Over 15 years of research and development supporting AMTAS validity
• +1 more outcomes

Segments5 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration4 records

AI capability5 records

Feature5 records

Partnerships

One partnership is on record.

• International Distributor NetworkcoreChannel Partner/ Reseller/ DistributorGrason-Stadler maintains a worldwide distributor network with over 100 offices in over 70 countries. All international distributors are the exclusive provider of GSI products in their country. Distributors provide sales, installation, ongoing support, and calibration services for customers throughout the product lifecycle.

Scale indicators5 records

Recent moves7 records

Expansion highlights6 records

Direct peers

• Interacoustics: Denmark-based manufacturer of audiometric, tympanometric, OAE, and evoked potential equipment. Part of the Demant Group, Interacoustics is one of GSI's most direct global competitors across the full audiometric test battery.
• Natus Medical (Otometrics): Natus Medical's Otometrics division manufactures clinical audiometers, tympanometers, and balance assessment equipment used in audiology and ENT clinics worldwide, directly competing with GSI's product portfolio.
• Maico Diagnostics: German-based manufacturer specializing in screening and diagnostic audiometers, tympanometers, and OAE devices. Maico competes head-to-head with GSI in newborn hearing screening and clinical audiology markets globally.
• Inventis: Italian manufacturer of audiometric and tympanometric equipment, including clinical audiometers and middle ear analyzers. Inventis is a direct peer in clinical audiology equipment with comparable product categories to GSI.
• PATH Medical: Germany-based specialist in diagnostic audiology equipment including audiometers, tympanometers, and evoked potential systems. PATH Medical competes with GSI particularly in the evoked potentials and clinical audiology segments.
• Amplivox: UK-based manufacturer of screening and diagnostic audiometers used in occupational health, primary care, and school screening programs. Amplivox overlaps with GSI's screening audiometer (GSI 18) and portable product segments.

Emerging players

• Intelligent Hearing Systems: US-based manufacturer of evoked potential and OAE systems focused on newborn hearing screening and clinical diagnostics. IHSys has focused overlap with GSI's Audera Pro and Novus product lines.
• Echodia: French manufacturer of evoked potential, OAE, and audiometric screening devices. Echodia competes with GSI primarily in OAE and evoked potentials segments across European clinical and research markets.

Broad incumbents

• Demant (William Demant Foundation): Parent of Interacoustics, Oticon, and other hearing healthcare brands. Demant is a broad incumbent whose audiology diagnostics division directly competes with GSI while also offering hearing aids and hearing care services.
• GN Hearing (GN Store Nord): Danish hearing aid giant (parent of ReSound, Beltone) with a diagnostics arm that competes in audiometric equipment. GN is a broad incumbent offering both hearing aids and assessment equipment adjacent to GSI's market.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/GrasonStadler
• YouTubeyoutube.com/@GrasonStadler
• Facebookfacebook.com/grasonstadler
• LinkedInlinkedin.com/company/grason-stadler
• Instagraminstagram.com/grason_stadler

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 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 Grason-Stadler