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Ultra slim 48x48x12mm speaker
As IoT speaker, for conference phones and/or alarm applications
The slim profile allows the driver to be built into many low profile designs.
Maximum loudness performance will be with a sealed back cavity of 75cc, which results in a resonance frequency of 335Hz.
Under these conditions thedriver can handle up to 5W (resulting in a Sound Pressure Level of 92dBSPL/m) without any thermal challenges due to its extremely large voice coil diameter of 30.5mm with surrounding ventilation holes.
Key performance parameters
- Very low profile (12.1mm)
- High linear excursion (±1 mm)
- Sensitivity: 86±2 dB (1.0W/1.0m)
- Good bass response in small enclosures (230Hz/200cc, 335Hz/75cc, 520Hz/30cc.)
- High power handling (Nom./Max.): 2.0W / 3.0 W (in any size of rear volumes)
- Up to 5W Nom. power handling in a sealed rear volumes of 30-200cc resulting in 94.5 dBSPL @1m.
Ultra versatile
Install the 48mm driver in a slim enclosure for impressive performance
Dimensions
Frequency response and impedance
Free field, 1V 5cm
Also for fire-, burglar- and smoke alarm applications
For both 520 Hz and 3 kHz systems
• Suitable for smoke-, fire- and burglar alarms.
• 520Hz & 3 kHz alarm for hotels & residential.
• Complies with UL 217 & UL 464 standards.
The US standards UL 217 & UL 464** describes criteria to be met for hotel & Residential fire/smoke alarms. Two specific frequencies, 520Hz & 3kHz are mentioned as tones essential for maximum alert effect:
520Hz: 3 Meters distance: 85 dBA
3kHz: 3 Meters distance: 85 dBA
The 484812 loudspeaker was tailored to meet these fire/smoke alarm standards when built into a suitable enclosure (please refer to the cross sectional cut drawing below). The speaker's resonance frequency is pushed up to 520Hz and the Helmholtz resonator in front of speaker will boost the 3kHz sensitivity to its maximum.
Under these conditions, when driving the speaker system with a square wave signal, the following SPL levels are met and exceeded:
520Hz: 85dBA/3 Meters/5W.
3 kHz: 85dBA/3 Meters/5W
**US standards UL 217 & UL 464
While fire alarm systems and smoke alarms provide life-saving value for people when they are awake, their greatest potential benefit may be when occupants are asleep. In 2008, a compilation of a decade’s worth of research at Victoria University on the effectiveness of various alarm signals for awakening people was released. Different types of signals were tested to determine their waking effectiveness for healthy adults and high-risk groups. Of all the signals tested, the low frequency signal with a fundamental frequency of 520 Hz was most effective at waking the majority of participants. Specifically, the low frequency signal was found to be 6 to 10 times more effective at waking people than the standard alarm signal. In adults with hearing loss, it was more than 6 times as effective as the standard signal and more effective than bed and pillow shakers.
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