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New Solution for Room Acoustics Optimization

New Solution for Room Acoustics Optimization 
The acoustic characteristics of a room must be suitable for the purpose of the room. In classrooms, for example, a short reverberation time is a prerequisite for good speech intelligibility, whereas for a piano sonata in a concert hall, a longer reverberation time is more effective for a pleasant acoustic sound.

These common examples show how essential it is to adjust the reverberation time of a room to suit the planned application. The new “Room Acoustics Reporter“ PC software from NTi Audio, in combination with the DS3 Dodecahedron Speaker and the XL2 Sound Level Meter provides the perfect solution for reverberation time optimization calculations and comprehensive reporting according to ISO 3382 and DIN 18041.

The reverberation time of a room is one of the most important parameters in room acoustics. The intended use of the room determines the reverberation time requirements. In a classroom, for example, depending on the size of the room, reverberation time should be between 0.5 and 1.0 seconds in order to achieve good speech intelligibility. This is often not the case, particularly in old school buildings, due to a lack of absorbing materials. In a concert hall, a reverberation time of between two and three seconds is desired to create a warm and rich listening experience.

Powerful DS3 Sound Source
For standard-compliant reverberation time measurements, a sound source with omnidirectional characteristics is needed. The sound energy must be radiated uniformly in all directions. The current building acoustics standards also require a flat frequency spectrum in the relevant frequency range. The DS3 Dodecahedron Loudspeaker fulfills these requirements while delivering high sound power and thus provides a perfect excitation signal for reverberation time measurements.

Measurement of the Reverberation Time with the XL2
If a reverberation time measurement is required in 1/3rd octave resolution, the "Extended Acoustic Pack" Option can be installed onto the XL2 at any time. The XL2 automatically triggers on an impulse sound source or a gated pink noise. When recording the reverberation times, it is possible to switch between T20 and T30; these two types of analysis differ in the level reduction required to trigger a measurement.



Extreme acoustics in the shooting range

RMS Shooting Range 

Imagine this scene in a Hollywood action movie: Two police officers are chasing the bad guy in an industrial area surrounded by high concrete walls. A wild gunfight ensues for several minutes. In the end, the police capture the bad guy and all walk off unhurt.

What is wrong with this scene? In reality if it had happened that way, all involved parties would be temporarily deaf and might even have suffered permanent hearing damage.

As a manufacturer of sound level meters, we asked ourselves how loud gunfire really is. To find out we got in touch with the owner of a local indoor shooting range.

The „RMS Shooting Anstalt“ in Schaan, Liechtenstein, operates a state-of-the-art shooting range in the border triangle region of Germany, Austria and Switzerland. Besides recreational use and competitions, security personnel often use this facility for professional training sessions.

Measuring the reverberation time
What is the ideal reverberation time in an indoor shooting range?
The noise level is even high before shooting, as the powerful air ventilation contributes significantly to the background noise.


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Extreme acoustics in the shooting ranges

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Sound Bite


Meet NTi Audio at the following Events:

09 - 13 Sept. 2019
ICA 2019
Booth: 22
Aachen, Germany

13 - 15 Sept. 2019
2019 NCAC Annual Meeting
Atlanta, US

01 - 02 Oct. 2019
acoustex 2019
Booth: NE.E11
Dortmund, Germany

16 - 18 Oct. 2019
New York, US

Did you know ...

... that the RT60 overload detection can be disabled on the XL2 Sound Level Meter?

The XL2 has a feature that discards RT60 results when a level overload condition occurs. This is in accordance with the ISO 3382 standard. Sometimes you might not be able to reduce the level of an impulse sound source; e.g. in a small room using a starter gun. In order to still get an RT60 result in such a situation, this overload feature can be disabled by loading the file below in the root directory of the XL2. Note that such an overload condition may affect the RT60 result.

Load the file “RT60allowOVLD.txt” into the root directory of the XL2.

Sound Bite

Do Protons Colliding at the Large Hadron Collider make a Sound?

While the machinery and electronics that perform the experiments make plenty of acoustic noise, the actual particles do not: the collisions happen in a vacuum. No air, no sound.

Despite the lack of sound, what is happening there is incredible:

Read more!

See all the past Sound Bites and interesting customer responses in our archive.

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