# Audiometric Transducers for Clinical Audiometry — BC1, CA1, IN1, SA1 | Auditdata Measure
> Five certified audiometric transducers: BC1 bone conductor, CA1 circum-aural headphone, CA1 HF to 16 kHz, IN1 insert earphone, SA1 supra-aural. Class 2a. IEC 60645-1. PTB Berlin validated.
NEW TRANSDUCER LINE · LAUNCHING APRIL 2026
# **Five Transducers. One Connected Diagnostic Workflow.**
The BC1, SA1, IN1, CA1 and CA1 HF form a complete, certified transducer suite, covering bone conduction, circum-aural, insert, and supra-aural testing. Purpose-built for audiological hearing loss measurement, independently validated, and designed to integrate seamlessly with the full Auditdata Measure ecosystem.
Class 2a Medical Device · IEC 60645-1 · ANSI S3.6 · PTB Berlin Validated
BC1
## Bone Conductor
A sturdy and reliable bone conductor delivering high-quality audio performance specifically designed for hearing loss testing.
SA1
## Supra-Aural Headphone
The SA1 replaces the DD45 headphones, validated by PTB Berlin and independently tested by Audiometrix.
IN1
## Insert Earphone
A sturdy, reliable insert earphone delivering high-quality, precisely controlled audio performance for hearing loss testing.
CA1
## Circum-Aural Headphone
Sturdy, reliable, over-ear headphones delivering high-quality audio performance specifically designed for hearing loss testing.
CA1 HF
## Circum-Aural HF Headphone
The CA1 replaces the DD450 headphones for high frequency testing, validated by PTB Berlin and independently tested by Audiometrix.
Bc1
BC1
## **Bone Conductor**
Independently validated by PTB Berlin under simulated real-clinic conditions and all wear parts available as spare parts for repair and refurbishment.
**250 Hz - 4 kHz**- Frequency Range
**-10 - 80 dB HL**- Output Range
**96 DB VFL** - Sensitivity @ 1KHZ
**<5.5%** - Max Distortion
**10 Ω** - Impedance
**5.4 N** - Headband Pressure
## Clinically Validated
Independently evaluated by PTB Berlin under simulated real-clinic conditions — stable, consistent performance aligned with clinical and industry expectations.
## Repairable by Design
Padding, headband, and cable are all available as spare parts for repair and refurbishment — reducing total cost of ownership over time.
## Full Medical Certification
Class 2a Medical Device certified. Biocompatible per ISO 10993-1. RoHS compatible — lead, nickel and latex free.
## BCHB1 Real Ear Compatible
Supports the new BCHB1 Real Ear headband (2026) for seamless integration within the full Auditdata Measure transducer ecosystem.
Sa1
SA1
## **Supra-Aural Headphone**
The new Supra-Aural Headphones are validated by PTB Berlin and independently tested by Audiometrix. Supporting three headband types including the new SAHB-1 headband, with covered screws for medical safety compliance and color-coded plugs for clear left/right identification.
**125 Hz - 8 kHz** - Frequency Range
**-10 - 120 dB HL**- Output Range
**103 dB SPL**- Sensitivity @ 1kHz
**Up to 16 kHz**- High Frequency Optional
**<2.5%** - Max Distortion
**10 Ω** - Impedance
**3 Headbands** - HB-7 / HBA/ SAHB-1
## 3 Headband Options
Compatible with HB-7 (Wilfan), HBA (RadioEar), and the new SAHB-1 Real Ear headband for full flexibility.
## Medical Safety by Design
Covered screws for full medical safety compliance. Color-coded plugs eliminate left/right placement errors.
## PTB Berlin Validated
ETSPLs independently verified by PTB Berlin — the same rigorous validation standard used across the SA1 and CA1.
In1
IN1
## **Insert Earphone**
The IN1 includes a built-in memory chip (Mini-DIN variant) for automatic transducer recognition and comes with a fastener kit for flexible patient placement, on the arm or around the neck.
**125 Hz - 8 kHz**- Frequency Range
**-10 - 120 dB HL** - Output Range
**103 DB VFL** - Sensitivity @ 1KHZ
**<2%** - Max Distortion
**10 Ω** - Impedance
**Memory Chip** - Auto Recognition
## Built-in Memory Chip
The Mini-DIN version includes an embedded chip for automatic transducer identification by the audiometer.
## Flexible Patient Placement
Included fastener kit (2 clips + Velcro strap) allows arm or neck placement for patient comfort.
## Ultra-Low Distortion
Less than 2% THD, with maximum 2.5% at 110 dB HL — exceptional signal purity across the full test range.
## Output to 120 dB HL
Wide dynamic range supporting comprehensive audiometric testing across diverse patient profiles.
Ca1
CA1
## **Circum-Aural Headphone**
Available in standard and High Frequency (HF) variants reaching up to 8,000 Hz, with color-coded earcups for clear left/right identification at a glance.
**125 Hz - 8 kHz** - Frequency Range
**-10 - 120 dB HL** - Output Range
**100 dB SPL**- Sensitivity @ 1kHz
**Up to 16 kHz**- [High Frequency Variant](https://www.auditdata.com/audiology-solutions/measure/transducers/circum-aural-high-frequency-audiometric-headphone/ "Circum-Aural High-Frequency Audiometric Headphone ")
**<2.5%** - Max Distortion
**40 Ω** - Impedance
## HF Option to 16 kHz
[CA1 HF variant extends](https://www.auditdata.com/audiology-solutions/measure/transducers/circum-aural-high-frequency-audiometric-headphone/ "Circum-Aural High-Frequency Audiometric Headphone ") testing to 16,000 Hz for extended high-frequency audiometry.
## Color-Coded Earcups
Clear left/right identification reduces placement errors and speeds up clinic workflow.
## Excellent Ambient Attenuation
Passive attenuation up to 44 dB at 4 kHz for accurate testing in non-soundproofed environments.
## Repairable by Design
Cushions, headband, and cable are all available as spare parts for repair and refurbishment.
Ca1-HF
CA1 HF
## **Circum-Aural High Frequency Headphone**
The CA1 HF is a circum-aural audiometric headphone validated for extended high-frequency (EHF) audiometry, covering 125 to 16,000 Hz.
## Extended High-Frequency Range
Covers 125–16,000 Hz, enabling EHF audiometry for ototoxicity monitoring, noise-induced hearing loss detection, and tinnitus workups.
## PTB Berlin Validated
ETSPLs verified by Dr. Marion Bug at PTB Berlin (DN02777) - the same validation standard as the CA1 standard variant.
## Yellow Plug Identification
Yellow Mini-DIN connector distinguishes the HF variant from the [standard CA1](https://www.auditdata.com/audiology-solutions/measure/transducers/circum-aural-audiometric-headphone/ "Circum-Aural Audiometric Headphone") at a glance.
INDEPENDENT VALIDATION
## **Every Claim, Independently Verified**
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
Austrian based audiology experts Audiometrix evaluated the transducers under simulated real-clinic conditions using professional audiometric calibration procedures and equipment. The transducers demonstrated stable and consistent performance aligned with clinical and industry expectations.
Audiometrix
Austrian Audiology Experts
## **Ready to Bring the Full Transducer Line into Your Clinic?**
Whether you're evaluating one product or equipping a full network, our team will help you find the right setup. Tell us which products you're interested in and we'll get back to you within one business day.
**Frequently Asked Questions**
## What audiometric transducers does Auditdata Measure offer?
Auditdata Measure offers five certified audiometric transducers: the BC1 bone conductor (250–4,000 Hz), the CA1 circum-aural headphone (125–8,000 Hz), the CA1 HF high-frequency headphone (125–16,000 Hz), the IN1 insert earphone (125–8,000 Hz), and the SA1 supra-aural headphone (125–8,000 Hz). All five are Class 2a Medical Devices meeting IEC 60645-1:2017 and ANSI S3.6:2018.
## Which audiometric transducer is used for which type of hearing test?
Bone conductors (BC1) are used for bone conduction pure-tone testing to differentiate sensorineural from conductive hearing loss. Supra-aural headphones (SA1) are the most widely used for standard air conduction audiometry. Circum-aural headphones (CA1) provide higher passive ambient noise attenuation. Insert earphones (IN1) offer greater inter-aural attenuation and are preferred for paediatric testing. High-frequency headphones (CA1 HF) are required for extended high-frequency audiometry at 9,000–16,000 Hz.
## Are the Auditdata transducers independently validated?
Yes. The CA1 and SA1 headphones were validated by Dr. Marion Bug at PTB Berlin, Germany's national metrology institute, with ETSPLs confirmed for the CA1/CA1 HF (DN02777) and SA1 (DN02778). All five transducers were independently evaluated by Audiometrix, Austrian-based audiology experts, under simulated real-clinic conditions using professional audiometric calibration procedures.
## How does Auditdata handle audiometric transducer calibration?
Auditdata's [Calibration SWAP](https://www.auditdata.com/audiology-solutions/measure/services/calibration-service/ "Calibration Service") service eliminates clinic downtime during annual calibration. Calibration data is stored in the transducer plug, the audiometer reads it automatically on connection. Pre-calibrated replacement transducers are shipped before existing ones expire; the clinic plugs in the new transducers and returns the expired ones in the same packaging. No manual recalibration is required.