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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 | |
|---|---|
| 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 | |
|---|---|
| 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 | |
|---|---|
| Cone material | Aluminum |
| Surround material | Rubber |
| Voice coil wire material | Copper |
| Voice coil former material | Aluminum |
| Frame material | Polymer |
| Magnet material | Neodymium |
| Mounting informations | |
|---|---|
| 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 | |
|---|---|
| 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 |