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ACOUSTICS - BACKGROUND INFO

Sabines formula

Sabine is the father of modern acoustics. He found that reverberation time is described by a relationship between the room size and the amount of absorption in the room. Larger rooms - longer reverberation. More absorption - shorter reverberation.

T = 0.161 * V / A

where

T:Reverberation time in seconds

V:Volume in m3

A:Absorption in m2 Sabine

0.161: Is a constant (to make the calculation right with the actual units)

One square meter (1 m2) Sabine is comparable to an open window with an area of one square meter: The sound that hits the window will disappear and never return. One square meter Sabine is one square meter with full absorption.

The basic formula sounds simple, but the problem is that the materials in the room will absorb differently at different frequencies. The absorption may range from nothing (fully reflective) to total absorption.

A proper reverb time should be constant with frequency, but this is not always the case because of the behavior of the materials in the room. The low frequencies are the most difficult to control.

This is why the reverberation time against frequency in practice may look like this:

 

 

 

 

X-stu d io , re v e rb e ratio n time in co n tro l ro o m

 

 

 

 

0,80

 

 

 

 

 

 

 

 

0,70

 

 

 

 

 

 

 

 

0,60

 

 

 

 

 

 

 

time [s]

0,50

 

 

 

 

 

 

 

0,40

 

 

 

 

 

 

 

Reverb

 

 

 

 

 

 

 

0,30

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0,20

 

 

 

 

 

 

 

 

0,10

 

 

 

 

 

 

 

 

0,00

 

 

 

 

 

 

 

 

63

125

250

500

1000

2000

4000

8000

Fre que nc y [Hz]

Reverberation time measured in a control room. From 250 Hz and above the curve is nicely placed around .3 sec. But belov the reverb time rises to .75 sec. which is too much.

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Dynaudio pmn manual Sabines formula
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pmn specifications

Dynaudio, a company renowned for its high-fidelity audio products, has made significant strides in the field of professional monitoring through its PPM (Professional Precision Monitoring) series. Among the standout models in this series is the Dynaudio PMN (Professional Monitoring Nearfield), which has garnered attention for its outstanding sound quality, precise technical performance, and sophisticated design.

One of the key features of the Dynaudio PMN monitors is their advanced driver technology. Equipped with proprietary drivers, the PMN series employs custom-designed woofers and tweeters that deliver an incredibly accurate frequency response. The woofers utilize a lightweight diaphragm, ensuring that low frequencies are produced with power while maintaining clarity. The tweeters, known for their soft dome design, excel in reproducing high frequencies with exquisite detail and minimal distortion, making the listening experience both immersive and enjoyable.

In terms of design, the PMN monitors boast a sleek and modern aesthetic that fits seamlessly into any studio environment. The cabinet construction employs advanced materials and techniques that minimize resonance, thus reducing unwanted coloration in sound. The unique curved shape of the cabinets is not only visually appealing but also supports optimal acoustic performance by enhancing sound dispersion.

Another notable characteristic of the Dynaudio PMN is its versatility. The monitors are equipped with multiple inputs, allowing for seamless integration into various set-ups, whether in a professional studio or a home listening environment. This flexibility is further complemented by adjustable bass and treble controls, empowering users to tailor the sound profile to their specific requirements.

Dynaudio has also incorporated advanced technologies such as room correction in certain PMN models, which enables precise calibration according to the acoustics of the room. This feature ensures that audio professionals can rely on consistent and accurate sound reproduction regardless of their monitoring environment.

Overall, the Dynaudio PMN series represents a blend of pioneering audio technology, meticulous craftsmanship, and user-focused design. For professionals seeking precise monitoring solutions for music production, film scoring, or any audio-related projects, the Dynaudio PMN monitors provide an exceptional listening experience that stands the test of time. With their stellar performance and innovative features, these monitors have become a top choice for sound engineers, musicians, and audio enthusiasts alike.
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