# Circum-Aural Audiometric Headphone
Auditdata Measure · NEW TRANSDUCER LINE · CA1
# **Circum-Aural Audiometric Headphone**
Class 2a Medical Device · IEC 60645-1 · ANSI S3.6 · ISO 389-5 / 389-8
The Auditdata CA1 is a circum-aural audiometric headphone designed for clinical hearing loss diagnostic testing, covering 125 to 8,000 Hz in the standard variant and 125 to 16,000 Hz in the CA1 HF variant. With a sensitivity of 100 dB SPL at 1 kHz and passive ambient attenuation of up to 44 dB at 4 kHz, the CA1 is validated by Dr. Marion Bug at PTB Berlin and independently tested by Audiometrix.
## 125 Hz – 8kHz
Standard Range
## −10 to 120
Output (dB HL)
## PTB Berlin & Audiometrix Validated
The CA1 has been independently validated by Dr. Marion Bug at PTB Berlin and evaluated by Austrian audiology experts Audiometrix under simulated real-clinic conditions — confirming reliable, accurate measurements suitable for professional audiometry.
## Standard & High Frequency in One Platform
The [CA1 HF variant](https://www.auditdata.com/audiology-solutions/measure/transducers/circum-aural-high-frequency-audiometric-headphone/ "Circum-Aural HF Audiometric Headphone ") extends testing to 16,000 Hz for extended high-frequency audiometry, using the same certified platform. One headphone family covers routine pure-tone testing and extended HF protocols, minimizing equipment investment.
## Excellent Ambient Attenuation
Passive noise attenuation of up to 44 dB at 4 kHz reducing the need for fully sound-treated booths in many clinical environments. Color-coded earcups and single-sided cable connection further streamline setup and reduce placement errors.
Best Care Experience
## **Every Patient Deserves a Test They Can Trust**
Great hearing care starts with great measurement. The CA1 was designed around the realities of a working audiology clinic where reliable results matter as much as efficient workflows and patient comfort.
Whether running a standard pure-tone test or an extended high-frequency protocol, the CA1 delivers consistent, certified performance from the first patient of the day to the last.
- **Consistent results, every session**. Stable calibrated performance means audiologists focus on the patient, not the equipment.
- **Designed for real clinic environments.** Excellent passive attenuation supports accurate testing even in non-soundproofed rooms..
- **Serviceable for long-term value.** Cushions, headband, and cable are all available as spare parts for repair and refurbishment, reducing total cost of ownership.
The CA1/SA1 headphones, when used in combination with pure-tone audiometers, have been validated as suitable for audiometric applications. The results confirm that the headphones provide reliable and accurate measurements, making them suitable for professional audiometry.
Dr. Marion Bug
PTB Berlin
WHAT WE CLAIM
## **Every Claim, Backed By Data**
The CA1 is built to perform to specification, here's exactly what that means.
**High-quality audio performance** specifically designed for hearing loss testing across the full audiometric frequency range.
**Output Sound Level Precision of ±3 dB** controlled accuracy across the full −10 to 120 dB HL range, at time of manufacturing.
**Total Harmonic Distortion below 2.5%** at recommended max output levels, maintaining signal purity across the full test range.
**Sensitivity of 100 dB SPL at 1 kHz, 1 mW** verified at time of manufacturing for reliable, repeatable output levels.
**Color-coded earcups for instant left/right identification** reducing placement errors and speeding up clinical workflows.
**Passive ambient attenuation up to 44 dB at 4 kHz** supporting accurate testing in non-soundproofed clinical environments.
**Biocompatible per ISO 10993-1** lead, nickel, and latex free; RoHS compatible. Safe for direct patient contact.
**Available on request in multiple plug formats** DIN, Mini-DIN, Mono Jack, Stereo Jack, Stereo Mini-Jack — for broad audiometer compatibility.
Technical Datasheet
## **CA1 Product Specifications**
**Related Standards:**IEC-60645-1:2017, ANSI S3.6:2018 (R2023), ISO 389-5:2006, ISO 389-8:2004
**Frequency Range CA1:**125 Hz – 8,000 Hz
**Frequency Range CA1 HF:**125 Hz – 16,000 Hz
**Output Level Range:** −10 – 120 dB HL
**Output Level Precision\*:** ±3 dB
**Sensitivity\*:** 100 dB SPL @ 1kHz, 1mW
**Distortion\*:**<2.5% at Recommended Max Levels
**Nominal Impedance:** 40 Ω (±15%)
\*At time of manufacturing · Copyright © Auditdata A/S. 2026/03
## **Ready to Bring the CA1 into Your Clinic?** Get in Touch
Whether you need standard or HF variants, a single site or a full network rollout — our team will help you configure the right solution for you.
**Frequently Asked Questions**
## What is the CA1 audiometric headphone?
The CA1 is a circum-aural (over-ear) audiometric headphone manufactured by Auditdata for clinical hearing loss diagnostic testing. It covers 125–8,000 Hz in the standard version and 125–16,000 Hz in the HF variant. It is PTB Berlin validated and certified as a Class 2a Medical Device per IEC 60645-1:2017 and ANSI S3.6:2018.
## What is the CA1 audiometric headphone designed for?
The CA1 is a circum-aural (over-ear) headphone purpose-built for pure-tone audiometry and hearing loss diagnostic testing in clinical settings. Its over-ear design provides passive ambient attenuation of up to 44 dB at 4 kHz, reducing the impact of background noise in real-world clinic environments without requiring a fully soundproofed booth.
## What is the difference between the CA1 and the CA1 HF?
The CA1 covers the standard audiometric frequency range of 125–8,000 Hz and uses a Red Mini-DIN connector (Part No. 100.064). The [CA1 HF](https://www.auditdata.com/audiology-solutions/measure/transducers/circum-aural-high-frequency-audiometric-headphone/ "Circum-Aural HF Audiometric Headphone ") extends testing to 16,000 Hz for extended high-frequency (EHF) audiometry and uses a Yellow Mini-DIN connector (Part No. 100.065) for visual identification. Both variants share the same PTB Berlin validation (DN02777).
## How much ambient noise attenuation does the CA1 provide?
The CA1 provides passive ambient noise attenuation of up to 44 dB at 4 kHz, 43 dB at 6,000 and 8,000 Hz, and 17 dB at 125 and 250 Hz, reducing the impact of background noise during audiometric testing without a soundproofed booth.
## Is the CA1 compatible with my audiometer?
The CA1 is available on request in DIN, Mini-DIN, Mono Jack, Stereo Jack, and Stereo Mini-Jack plug formats, covering broad audiometer compatibility. It is natively supported on the [Auditdata Measure](https://www.auditdata.com/audiology-solutions/measure/diagnostic-audiometer-fitting-unit/ "Diagnostic Audiometer & Fitting Unit").
## Who validated the CA1?
The CA1 was validated by Dr. Marion Bug at PTB Berlin (ETSPLs reference DN02777) and independently evaluated by Audiometrix. PTB Berlin confirmed the headphones are suitable for audiometric applications and provide reliable, accurate measurements for professional audiometry.