# 4227 Bruel & Kjaer Vibration and Sound Used

**Additional Features:**

-   Conforms to IEEE-269, IEEE-661 and ITU-T P.51.
-   Accurate level and frequency response calibration is easily done using a Brüel & Kjær ½" microphone placed in the supplied calibration jig
-   Accurate simulation of human voice field
-   Quality control testing of frequency response and distortion of telephone transmitters and close-talking microphones
-   Continuous SPL of 100dB 25mm from lip ring
-   Low distortion
-   Built-in overload protection circuit

The Bruel and Kjaer 4227 is an accurate reference sound source developed for near field testing of telephone transmitters and microphones. It provides a standardised and realistic simulation of the human voice field.

## Details

- **Price:** 0.0 USD
- **Vendor:** Bruel & Kjaer
- **Type:** Vibrat
- **Tags:** Bruel & Kjaer, Manufacturers, Other Equipment, product_manual_group_1, Product_used, Vibration & Sound

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 0.00 USD | In stock |

## Images

- 4227 Bruel & Kjaer Vibration and Sound Used

---

> Source: [ValueTronics](https://valuetronics.com/products/4227-bruel-kjaer-vibration-and-sound-used)
> Updated: 2026-05-21