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DAYTON AUDIO DMA80-PR Aluminium Passive Radiator 34.6Hz Ø7.6cm
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Dayton Audio DMA80-PR
Aluminium Passive Radiator 34.6Hz Ø7.6cm
The Dayton Audio DMA80-PR is a 7.6cm diameter passive radiator. This is an excellent solution for a boost in bass in smaller speakers. This small passive radiator has everything you would expect from larger models, including an adjustable mass, an Aluminium diaphragm and a rubber suspension. Visually identical to the Dayton Audio DMA Series wideband speakers, this DMA80-PR can also be used with any other small speaker requiring reinforcement in the low frequencies. The threaded rod and wing nut included at the back of the diaphragm allow easy adjustment of the mass to adjust the passive radiator to your project.
In general, a passive radiator must have at least twice the air displacement (Vd) of the system's active loudspeaker/subwoofer. To calculate the air displacement: Vd = Sd x Xmax.
Operation of a passive radiator
The passive radiator (or passive loudspeaker) fits into a box with an active loudspeaker. This passive radiator, while at first glance it may look like a "classic" loudspeaker, does not actually have any engine parts. Thus, there will be no coil, magnet or power supply in its design. Similarly, it will not be electrically connected to a power amplifier.
To diffuse sound, the passive radiator will use the air pressures and depressions induced by the active loudspeaker in the body to vibrate its membrane and produce a sound, thus providing deep bass. Its resonance frequency is determined by its mass and the air contained in the enclosure. It will therefore be possible to vary its resonance frequency on many models and tune it to the speaker by adding or removing mass.
Technical charcateristics
| Specifications | ||
|---|---|---|
| Product type | Passive radiator | |
| Speaker driver range | DMA | |
| Nominal diameter | Ø7.6cm (3") | |
| Resonant frequency (Fs) | 34.6Hz | |
| Mechanil quality coefficient (Qms) | 8.91 | |
| Compliance equivalent volume (Vas) | 0.071 ft.³ | |
| Mechanical compliance of suspension (Cms) | 1.41 mm/N | |
| Diaphragm mass inc. airload (Mms) | 13.7g | |
| Max linear excursion (Xmax) | 7mm | |
| Surface area of cone (Sd) | 31.2cm² | |
| Cone material | Aluminium | |
| Basket material | Polymer | |
| Mounting informations | ||
|---|---|---|
| Total external dimensions | 80.5 x 80.5mm | |
| Cutout diameter | 74.4mm | |
| Depth | 44.7mm | |
| Bolt circle diameter | 95.2mm | |
| Mounting holes number | 4 | |
| Speaker Power (W RMS) | NC |
| Speaker Type | Passive Radiator |
| Impedance (Ω) | NC |
| Loudspeaker diameter (mm) | 76.0 |
| Diaphragm type | Aluminium |
| Efficiency / Sensitivity (dB) | N/A |
| Max Linear Excursion (Xmax) (mm) | 7.0 |
| Lowest frequency (Hz) | N/A |
| Highest frequency (Hz) | N/A |
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