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Delivering high efficiency and low distortion, the Dayton Audio DMA70-8 is an ideal full-range driver for modern compact speaker design. Its motor uses two neodymium magnets to create a strong, balanced magnetic field for perfect diaphragm control. The DMA70-8's careful design also reduces inductance and distortion, improving high-frequency response. The double-layer voice coil is wound on a widely ventilated aluminum support, allowing for excellent heat dissipation, power handling and low compression. The aluminum diaphragm is held in place by a rubber surround and a large frame, providing excellent mechanical damping.
Technical characteristics
Specifications | |
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Driver type | Full range |
Nominal diameter | Ø63.5mm (2.5") |
Power handling | RMS : 20W Max : 40W |
Impedance | 8Ω |
Frequency response | 110Hz - 20kHz |
Sensitivity | 82.9dB 2.83V/1m |
Voicec coil diameter | Ø25.4mm (1") |
Weight | 159g |
Thiele-Small parameters | |
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Resonant frequency (fS) | 113.7Hz |
DC resistance (RE) | 7.5Ω |
Electrical quality factor (QES) | 0.73 |
Mechanical quality factor (QMS) | 2.06 |
Total quality factor (QTS) | 0.50 |
Compliance equivalent volume (VAS) | 0.566L (0.02ft³) |
Voice coil inductance (LE) | 0.5mH |
Force factor (B·l) | 4.7T·m |
Mechanical compliance of suspension (CMS) | 730µm/N |
Surface area of cone (SD) | 22.9cm² |
Maximum linear excursion (Xmax) | ±2mm |
Suspension mechanical resistance (RMS) | 0.9T·m |
Moving mass (MMD) | 2.5g |
Moving mass (including airload) (MMS) | 2.6g |
Surface of the diaphragm (SD) | 22.9cm² |
Displacement volume at Xmax (VD) | 4.6cm³ |
Efficiency (η₀) | 0.11% |
Efficiency bandwidth product (EBP) | 155 |
Materials | |
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Cone material | Aluminum |
Surround material | Rubber |
Voice coil wire material | Copper |
Voice coil former material | Aluminum |
Frame material | Polymer |
Magnet material | Neodymium |
Mounting informations | |
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Overall outside dimensions | 70*70mm |
Cutout diameter | Ø64mm |
Total depth | 68.6mm |
Bolt circle diameter | Ø84.1mm |
Number of mountin holes | 4 |
Optimum cabinet size | |
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Sealed volume | 0.71L (0.025ft³) |
Sealed F3 | 183Hz |
Vented volume | 1.1L (0.04ft³) |
Vented F3 | 88Hz |
Speaker Power (W RMS) | 20.0 |
Speaker Type | Full range |
Impedance (Ω) | 8 |
Loudspeaker diameter (mm) | 70.0 |
Diaphragm type | Aluminium |
Efficiency / Sensitivity (dB) | 83.0 |
Max Linear Excursion (Xmax) (mm) | 2.0 |
Lowest frequency (Hz) | 110 |
Highest frequency (Hz) | 20000 |