Boundary Layer Microphones

Boundary Microphone: The ideal solution for stage, theater, and studio

A boundary microphone (also known as a Boundary Microphone or PZM) is a unique type of microphone specifically designed to make optimal use of reflections on flat surfaces. Thanks to this design, boundary microphones provide a higher output signal and a very natural sound reproduction, making them indispensable in both professional audio recordings and live performances on stage.

How does the technology behind the Boundary Effect work?

When a microphone capsule is placed very close to a flat surface (such as a floor, wall, or table), the sound is perceived as louder. This is because the microphone picks up the sound in two ways simultaneously: directly and via the reflection from the surface. In this 'Pressure Zone', a high-pressure area of sound is created.

In practice, this results in a significant improvement in quality:

• Higher Gain: A theoretical increase in the signal of up to 6 dB.
• Better Signal-to-Noise Ratio: An improvement of +3 to +6 dB compared to standard microphones.
• Phase Correction: Since the reflection and direct sound arrive simultaneously, you won't experience comb filtering effects.

Versatile applications of the boundary microphone

Due to their unobtrusive design and wide pickup pattern, boundary microphones can be used for various professional purposes:

• Meetings and Conferences: Perfect for capturing all participants around a table with maximum speech intelligibility.
• Theater and Stage: Discreetly placed on the stage floor to capture the actors without visible stands.
• Studio Recordings (Drums): Often placed in the bass drum (kick drum) due to excellent bass response and quick attack.
• Ambient Sound: Ideal for capturing the natural 'room ambience' in a recording studio.

Professional quality at DMR Electronics

At DMR Electronics, you will find boundary microphones that meet the demands of modern broadcast and recording environments. Whether you are looking for a stable solution for your meeting room or a robust microphone for your drum kit; our selection offers the reliability and sound quality you expect from us. Enhance your recording chain with the unique features of the pressure zone microphone.

Frequently Asked Questions about boundary microphones (FAQ)

• Do I always need to place a boundary microphone on a flat surface?

Yes, for optimal performance, a hard, flat surface is essential. The larger the surface (for example, a large table or a wooden floor), the better the reproduction of low frequencies will be.

• Does a boundary microphone require phantom power?

Most professional boundary microphones are condenser microphones and therefore require phantom power (+48V) from your mixing console or audio interface to function.

• Is a boundary microphone suitable for vocals?

For individual vocals, a broadcast or vocal microphone is usually more suitable. However, for group singing or choirs on stage, a boundary microphone on the floor can be an excellent way to capture the overall sound without blocking the audience's view.