Eminence BETA-8A
Recommended for professional audio mid-bass applications or as a woofer in vented enclosures. Also suitable as a mid-bass speaker in sealed enclosures.
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| Specification | |
| Nominal Basket Diameter | 8″, 203 mm |
| Nominal Impedance* | 8 Ω |
| Power Rating* | |
| Program Power | 450 W |
| Watts | 225 W |
| Resonance | 65 Hz |
| Usable Frequency Range | 78 Hz – 4.5 kHz |
| Sensitivity* | 95.1 dB |
| Magnet Weight | 34 oz. |
| Gap Height | 0.312″, 7.9 mm |
| Voice Coil Diameter | 2″, 51 mm |
| Thiele & Small Parameters | |
| Resonant Frequency (fs) | 65 Hz |
| DC Resistance (Re) | 5.99 Ω |
| Coil Inductance (Le) | 0.49m H |
| Mechanical Q (Qms) | 4.95 |
| Electromagnetic Q (Qes) | 0.42 |
| Total Q (Qts) | 0.38 |
| Compliance Equivalent Volume (Vas) | 23.3 liters / 0.82 cu.ft. |
| Peak Diaphragm Displacement Volume (Vd) | 63 cc |
| Mechanical Compliance of Suspension (Cms) | 0.37 mm/N |
| BL Product (BL) | 9.6 T-M |
| Diaphragm Mass Inc. Airload (MMs) | 16 grams |
| Efficiency Bandwidth Product (EBP) | 156 |
| Maximum Linear Excursion (Xmax) | 3 mm |
| Surface Area of Cone (Sd) | 210 cm2 |
| Maximum Mechanical Limit (Xlim) | 7.4 mm |
| Mounting Information | |
| Recommended Enclosure Volume | |
| Sealed | 5.7-9.9 liters / 0.2-0.35 cu.ft. |
| Vented | 8.5-19 liters / 0.3-0.67 cu.ft. |
| Driver Volume Displaced | 0.027 cu.ft. / 0.76 liters |
| Overall Diameter | 8.24″, 209.3 mm |
| Baffle Hole Diameter | 7.13″, 181.1 mm |
| Front Sealing Gasket | Yes |
| Rear Sealing Gasket | Yes |
| Mounting Holes Diameter | 0.22″, 5.6mm |
| Mounting Holes B.C.D. | 7.75″, 196.9mm |
| Depth | 3.5″, 88.9 mm |
| Net Weight | 6.6 lbs, 2.99 kg |
| Shipping Weight | 7.4 lbs, 3.36 kgs |
| Materials of Construction | |
| Coil Construction | Aluminum voice coil |
| Coil Former | Polyimide former |
| Magnet Composition | Ferrite magnet |
| Core Details | Vented core |
| Basket Materials | Pressed steel basket |
| Cone Composition | Paper cone |
| Cone Edge Composition | Cloth cone edge |
| Dust Cap Composition | Solid composition paper dust cap |
