Bruel & Kjaer 4227 Mouth Simulator
The Bruel & Kjaer 4227 Mouth Simulator is a specialized acoustic device designed to replicate the sound characteristics of the human mouth. It is used for testing and calibrating microphones, headsets, and other audio equipment. It ensures accurate and consistent speech transmission and reception. Ideal for telecommunications, hearing aid manufacturing, and acoustic research, the 4227 provides a reliable and standardized sound source for precise audio measurements and evaluations.
- Model
- Bruel & Kjaer 4227
- Calibration
- Available on request
- Price
- $1,650
- Status
- In stock
- RFQ ref
- 4227
This unit
The Brüel & Kjær 4227 Mouth Simulator is an acoustic test instrument that replicates the sound field characteristics of the human mouth for precise calibration and measurement of audio equipment. It generates standardized acoustic output across telecommunications, hearing aid manufacturing, and acoustic research applications while meeting IEEE 269, IEEE 661, and ITU-T P.51 standards.
Technical Specifications Acoustic Output
Continuous SPL: minimum 110 dB SPL (200 Hz to 2 kHz) and minimum 100 dB SPL (100 Hz to 8 kHz) at 25 mm from lip ring
Pulsed operation: exceeds 120 dB SPL at 25 mm distance (up to 50 W for periods <2 seconds with 20-second intervals)
Mouth opening diameter: 20 mm at lip ring
Low distortion characteristics Frequency Response
Achieves ±1 dB deviation or better across 100 Hz to 10 kHz at 25 mm distance with equalization via ¼″ monitoring microphone in compressor loop Power
Maximum continuous consumption: 10 W
Short-duration operation: up to 50 W
Type 4227-A includes built-in Class D amplifier
Key Features
Built-in overload protection circuit for loudspeaker safety
Monitoring microphone provision: accepts Brüel & Kjær ¼″ microphone with ¼″ preamplifier for output level monitoring and frequency response optimization
Removable plastic dummy ¼″ microphone maintains consistent acoustic characteristics with or without active monitoring microphone installed
Supplied with UA-0901 calibration jig positioning ½″ measuring microphone at 25 mm from lip ring
Standards Compliance Conforms to IEEE 269, IEEE 661, and ITU-T Recommendation P.51 for human mouth sound field replication.
Typical Applications
Telecommunications equipment testing
Hearing aid calibration and verification
Acoustic measurement and research
Specifications
| Parameter | Value |
|---|---|
| Frequency Range | 100 Hz to 10 kHz |
Bruel & Kjaer 4227 — Repair & Calibration Service
Aumictech offers NIST-traceable calibration and repair for the Bruel & Kjaer 4227. All calibrations are performed to NIST-traceable standards and ship with a certificate. Turnaround is typically 1–3 business days after receipt.
Bruel & Kjaer 4227 price
This Bruel & Kjaer 4227 is listed at $1,650. Calibration is available separately from $450. Contact us for volume pricing or if you need multiple units.
Bruel & Kjaer 4227 calibration cost
NIST-traceable calibration for the Bruel & Kjaer 4227 is $450 (standard — pass/fail certificate and calibration sticker) or $650 (full measured data at every test point, reference standards documented, traceability chain included). Turnaround is 1 to 3 business days after receipt. See full calibration details →
