ALPHA-8MRA 8" American Standard Series Speaker
Recommended for pro audio and bass guitar applications as a midrange. Sealed basket makes this woofer independent of enclosure design.
Applications
Midrange | Pro Audio | Bass Guitar
Box Type: Horn Loading
Specifications
Download Spec Sheet Download Cab Design| SPECIFICATION | |
| Nominal Basket Diameter | 8", 203 mm |
| Nominal Impedance* | 8 Ω |
| Power Rating* | |
| Program Power | 250 W |
| Watts | 125 W |
| Resonance | 514 Hz |
| Usable Frequency Range | 400 Hz - 4.8 kHz |
| Sensitivity* | 100.9 dB |
| Magnet Weight | 20 oz. |
| Gap Height | 0.25", 6.4 mm |
| Voice Coil Diameter | 1.5", 38 mm |
| THIELE & SMALL PARAMETERS | |
| Resonant Frequency (fs) | 514 Hz |
| DC Resistance (Re) | 7.32 Ω |
| Coil Inductance (Le) | 0.34m H |
| 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) | 0 cc |
| Mechanical Compliance of Suspension (Cms) | 0.01 mm/N |
| BL Product (BL) | 8.9 T-M |
| Diaphragm Mass Inc. Airload (MMs) | 7 grams |
| Efficiency Bandwidth Product (EBP) | 247 |
| Maximum Linear Excursion (Xmax) | 1.6 mm |
| Surface Area of Cone (Sd) | 205.9 cm2 |
| Maximum Mechanical Limit (Xlim) | 3 mm |
| MOUNTING INFORMATION | |
| Recommended Enclosure Volume | |
| Sealed | N/a |
| Vented | - liters / - cu.ft. |
| Driver Volume Displaced | 0.02 cu.ft. / 0.58 liters |
| Overall Diameter | 8.22", 208.8 mm |
| Baffle Hole Diameter | 7.19", 182.6 mm |
| Front Sealing Gasket | Yes |
| Rear Sealing Gasket | Yes |
| Mounting Holes Diameter | 0.22", 5.6mm |
| Mounting Holes B.C.D. | 7.78", 197.6mm |
| Depth | 3.25", 82.6 mm |
| Net Weight | 4.4 lbs, 2 kg |
| Shipping Weight | 5.1 lbs, 2.31 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 |
Frequency Response
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ALPHA-8MRA 8" American Standard Series Speaker