# Circum-Aural High-Frequency Audiometric Headphone (CA1 HF) — Extended High Frequency to 16 kHz | Auditdata
> The CA1 HF is a circum-aural audiometric headphone validated to 16,000 Hz — enabling EHF audiometry for ototoxicity and noise damage monitoring. DD450 equivalent. PTB Berlin validated.
Auditdata Measure · NEW TRANSDUCER LINE · CA1 HF
# **Circum-Aural High-Frequency Audiometric Headphone**
Classified as a Class 2a Medical Device · IEC 60645-1 · ANSI S3.6 · ISO 389-5 / 389-8
The Auditdata CA1 HF is a circum-aural audiometric headphone validated for extended high-frequency (EHF) audiometry, covering 125 to 16,000 Hz. It is the direct replacement of the DD450 headset, validated by Dr. Marion Bug at PTB Berlin (DN02777) and independently tested by Audiometrix.
## 125 Hz – 16kHz
Standard Range
## −10 to 120
Output (dB HL)
## Standard & High Frequency in One Platform
The CA1 HF extends the same PTB Berlin, validated platform to 16,000 Hz, enabling extended high-frequency audiometry for ototoxicity monitoring, noise-induced hearing loss detection, and tinnitus workups. One headphone family covers routine pure-tone testing and EHF protocols, without additional training or equipment.
## Excellent Ambient Attenuation
Passive noise attenuation of up to 44 dB at 4 kHz and 43 dB at 6,000–8,000 Hz — reducing the need for fully soundproofed booths in many clinical environments. Colour-coded earcups eliminate left/right placement errors. Single-sided cable reduces desk clutter during testing.
Best Care Experience
## **Every Patient Deserves a Test They Can Trust**
Extended high-frequency audiometry is not a niche procedure, it is an early warning system. Cochlear damage from noise exposure or ototoxic medications typically appears first in the 9,000–16,000 Hz range, before any loss becomes detectable in the standard audiometric range.
The CA1 HF gives audiologists a certified, validated tool to catch what a standard test cannot, detecting damage earlier, enabling better clinical decisions, and delivering a level of diagnostic care that sets a clinic apart.
- **Earlier detection, better outcomes.** EHF testing at 9,000–16,000 Hz identifies cochlear damage before it appears in the standard 125–8,000 Hz range, giving clinicians a critical diagnostic advantage.
- **No extra learning curve.** Same headphone platform and fitting workflow as CA1. Switch by connecting the Yellow Mini-DIN plug, audiologists already know the setup.
- **Serviceable for long-term value.** Cushions, headband, and cable are available as spare parts for repair and refurbishment, reducing total cost of ownership over the equipment lifecycle.
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.
**Extended frequency range to 16,000 Hz** enabling full EHF audiometry protocols for ototoxicity monitoring, noise-induced hearing loss detection, and tinnitus specialist clinics.
**Output Sound Level Precision of ±3 dB** across the full −10 to 120 dB HL range (to 8,000 Hz); 60 dB HL maximum output at 16,000 Hz — verified at time of manufacturing.
**Total Harmonic Distortion below 2.5% at recommended maximum output levels** maintaining signal purity across the full 125–16,000 Hz range, including EHF frequencies.
**Sensitivity of 100 dB SPL at 1 kHz, 1 mW** verified at time of manufacturing for reliable, repeatable output across the headphone's working life.
**Yellow Mini-DIN plug visually distinguishes** the CA1 HF from the [standard CA1](https://www.auditdata.com/audiology-solutions/measure/transducers/circum-aural-audiometric-headphone/ "Circum-Aural Audiometric Headphone"), eliminating transducer misidentification in multi-headphone setups.
**Passive ambient noise attenuation up to 44 dB at 4 kHz** supporting accurate EHF test conditions even in clinical rooms without full acoustic treatment.
**Biocompatible per ISO 10993-1** lead, nickel, and latex free; RoHS compatible. Safe for direct patient contact in all clinical settings
**Same certified platform as CA1 standard** cushions, headband, and cable available as spare parts. No additional training required when transitioning from CA1 to CA1 HF.
Technical Datasheet
## **CA1 HF Product Specifications**
**Related Standards:**IEC-60645-1:2017, ANSI S3.6:2018 (R2023), ISO 389-5:2006, ISO 389-8:2004
[**Frequency Range CA1**](https://www.auditdata.com/audiology-solutions/measure/transducers/circum-aural-audiometric-headphone/ "Circum-Aural Audiometric Headphone")**:**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 HF 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 extended high-frequency audiometry?
Extended high-frequency (EHF) audiometry tests hearing from 9,000 to 16,000 Hz, above the standard 125–8,000 Hz audiometric range. EHF testing is clinically significant because cochlear damage from noise exposure or ototoxic medications typically appears first at high frequencies before becoming detectable in the standard range. Audiologists use EHF testing for ototoxicity monitoring, noise-induced hearing loss programmes, and tinnitus specialist workups.
## How do I identify the CA1 HF versus the standard CA1
The CA1 HF uses a Yellow Mini-DIN plug. The standard CA1 uses a Red Mini-DIN plug . The color coding enables instant visual identification in multi-transducer clinical setups without needing to read labelling.
## Does the CA1 HF require different calibration from the standard CA1?
No. The CA1 HF is validated using the same IEC 60318-1 coupler/ear simulator and RETSPL values as the CA1 standard. Both variants were validated by PTB Berlin under the same procedures (DN02777). Clinicians switching between CA1 and CA1 HF require no audiometer recalibration, only the correct transducer selection in software.
## What is the maximum output of the CA1 HF at 16,000 Hz?
At 16,000 Hz, the CA1 HF RETSPL is 54.0 dB and the maximum output level is 60 dB HL, referenced to the Auditdata Measure [Audiometer & Fitting Unit](https://www.auditdata.com/audiology-solutions/measure/diagnostic-audiometer-fitting-unit/ "Diagnostic Audiometer & Fitting Unit"). At 9,000 Hz the maximum is 90 dB HL; at 10,000 Hz it is 85 dB HL; at 12,500–14,000 Hz it is 75–80 dB HL.
## What medical certification does the CA1 HF have?
The CA1 HF is classified as a Class 2a Medical Device. It meets IEC 60645-1:2017, ANSI S3.6:2018 (R2023), ISO 389-5:2006, and ISO 389-8:2004. It is biocompatible per ISO 10993-1 and is lead, nickel, and latex free; RoHS compatible.