With their twelve loudspeakers built into a sphere, dodecahedrons have an omnidirectional radiation characteristic and are therefore used for acoustic measurements, where the directional sound radiation of conventional loudspeaker boxes is not desired.
Typical applications of dodecahedrons:
- Sound source for building and room acoustic measurements on site and in test facilities
- Reference sound source in vehicles (motor vehicles, rail vehicles) for investigation of sound propagation
- Dodecahedron m|dod 250C:
The small and very light dodecahedron is equipped with speakers of high sound quality and has a remarkable sound power despite its small diameter of only 250 mm.
- Dodecahedron m|dod 360A:
The dodecahedron is optimized for particularly high sound power at low mass.
- Combination of the dodecahedrons m|dod 360A and m|dod 360HTA:
The tweeter dodecahedron m|dod 360HTA supports the broadband operating m|dod 360A with a particularly high sound power in the frequency range from 4,000 Hz to 10,000 Hz.
Our dodecahedrons at a glance
|Type||completely colored plastic sphere (LDPE)||completely colored plastic sphere (LDPE)||completely colored plastic sphere (LDPE)|
|Color||yellow or white||red or white||red or white|
|Diameter||250 mm||360 mm||360 mm|
|Mass||4,1 kg||10,2 kg||35,5 kg|
|Electric power||220 W||600 W||600 W|
|Frequency range||to 10.000 Hz||to 5.000 Hz||from 4.000 Hz|
|Sound power level
with pink noise
with white noise
|Lw = 120 dB
Lw = 112 dB
|Lw = 125 dB
Lw = 117 dB
|Electric impedance||5 Ohm||5 Ohm||5 Ohm|
|Connection||Speakon NL4FC||Speakon NL4FC||Speakon NL4FC|
|Directivity||building acoustic measurements acc. to ISO 10140 and ISO 16283 room acoustic measurements acc. to ISO 3382||building acoustic measurements acc. to ISO 10140 and ISO 16283 room acoustic measurement acc. to ISO 3382||building acoustic measurements acc. to ISO 10140 and ISO 16283 room acoustic measurements acc. to ISO 3382|
|Typical application area||vehicle acoustics, room acoustics from office to medium hall sizes, building acoustics up to medium sound insulation (e.g. office).||room acoustics even for large halls, building acoustics in all application areas, test facilities and in situ||only in combination with m|dod 360A as test stand sonication in the frequency range extended upwards|
|Special features||very small and very light, high sound quality loudspeaker||broadband allrounder with high sound power||special tweeter dodecahedron for test facilities|
Dodecahedron m|dod 250C
The dodecahedron m|dod 250C consists of a plastic sphere and twelve high sound quality speakers with neodymium magnets and weighs only 4.1 kg. Its handle makes it comfortable to carry by hand. The small diameter of 250 mm also allows positioning under limited space conditions. This makes the dodecahedron m|dod 250C suitable for many acoustic measurements of lightweight structures from the rail and automotive sectors. But it can also be used very well for sound insulation measurements in office buildings or in room acoustics.
With the spherical design, all normative requirements for the directional characteristic are met.
When excited with pink noise, a sound power level of Lw = 120 dB is achieved. Determined by the volume of the sphere, the resonant frequency of the dodecahedron m|dod 250C is about 200 Hz. Below the resonant frequency, the sound power declines with 12 dB/octave. The main part of the sound power is radiated within and above the resonance frequency.
The dodecahedron m|dod 250C can be operated with any audio amplifier with suitable impedance and power.