Component Speaker Eminence Alpha 8MRA
| Specification | |
| Nominal Basket Diameter | 8″, 203.2mm |
| Nominal Impedance* | 8 ohms |
| Power Rating** | |
| Watts | 125W |
| Music Program | 250W |
| Resonance | 514Hz |
| Usable Frequency Range | 400Hz – 4.8kHz |
| Sensitivity*** | 100.9dB |
| Magnet Weight | 20 oz. |
| Gap Height | 0.25″, 6.35mm |
| Voice Coil Diameter | 1.5″, 38.1mm |
| Thiele & Small Parameters | |
| Resonant Frequency (fs) | 514Hz |
| DC Resistance (Re) | 7.32 |
| Coil Inductance (Le) | 0.34mH |
| Mechanical Q (Qms) | 4.48 |
| Electromagnetic Q (Qes) | 2.08 |
| Total Q (Qts) | 1.42 |
| Compliance Equivalent Volume (Vas) | 0.8 liters / 0.03 cu.ft. |
| Peak Diaphragm Displacement Volume (Vd) | 0cc |
| Mechanical Compliance of Suspension (Cms) | 0.01mm/N |
| BL Product (BL) | 8.9 T-M |
| Diaphragm Mass Inc. Airload (MMs) | 6.9 grams |
| Efficiency Bandwidth Product (EBP) | 247 |
| Maximum Linear Excursion (Xmax) | 1.6mm |
| Surface Area of Cone (Sd) | 205.9 cm2 |
| Maximum Mechanical Limit (Xlim) | 3mm |
| Mounting Information | |
| Recommended Enclosure Volume | |
| Sealed | N/a |
| Vented | N/a |
| Driver Volume Displaced | 35.3 cu.in. / 0.58 liters |
| Overall Diameter | 8.22″, 208.8mm |
| Baffle Hole Diameter | 7.19″, 182.5mm |
| Front Sealing Gasket | Fitted as standard |
| Rear Sealing Gasket | Fitted as standard |
| Mounting Holes Diameter | 0.22″, 5.5mm |
| Mounting Holes B.C.D. | 7.75″, 196.9mm |
| Depth | 3.25″, 83mm |
| Net Weight | 4.4 lbs, 2 kg |
| Shipping Weight | 5.1 lbs, 2.3 kgs |
| Materials of Construction | |
| Coil Construction | Copper voice coil |
| Coil Former | Polyimide former |
| Magnet Composition | Ferrite magnet |
| Core Details | Vented core |
| Basket Materials | Pressed steel basket with closed back |
| Cone Composition | Paper Cone |
| Cone Edge Composition | Paper cone edge |
| Dust Cap Composition | Solid composition paper dust cap |
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