BETA-12A-2
*Good replacement for Yamaha 12″ JAY51200 (121630C) woofers. Recommended for professional audio and bass guitar applications as a woofer in a vented enclosure. Also works well for PA in a sealed or bandpass enclosure.
Click Here to Download PDF Spec Sheet
Click Here to Download PDF Cabinet Design
| SPECIFICATION | |
| Nominal Basket Diameter | 12″, 305 mm |
| Nominal Impedance* | 8 Ω |
| Power Rating* | |
| Program Power | 500 W |
| Watts | 250 W |
| Resonance | 47 Hz |
| Usable Frequency Range | 43 Hz – 3.8 kHz |
| Sensitivity* | 98 dB |
| Magnet Weight | 38 oz. |
| Gap Height | 0.312″, 7.9 mm |
| Voice Coil Diameter | 2″, 51 mm |
| THIELE & SMALL PARAMETERS | |
| Resonant Frequency (fs) | 47 Hz |
| DC Resistance (Re) | 5 Ω |
| Coil Inductance (Le) | 0.64m H |
| Mechanical Q (Qms) | 6 |
| Electromagnetic Q (Qes) | 0.5 |
| Total Q (Qts) | 0.46 |
| Compliance Equivalent Volume (Vas) | 120.1 liters / 4.24 cu.ft. |
| Peak Diaphragm Displacement Volume (Vd) | 237 cc |
| Mechanical Compliance of Suspension (Cms) | 0.29 mm/N |
| BL Product (BL) | 10.8 T-M |
| Diaphragm Mass Inc. Airload (MMs) | 40 grams |
| Efficiency Bandwidth Product (EBP) | 94 |
| Maximum Linear Excursion (Xmax) | 4.4 mm |
| Surface Area of Cone (Sd) | 538.9 cm2 |
| Maximum Mechanical Limit (Xlim) | 11 mm |
| MOUNTING INFORMATION | |
| Recommended Enclosure Volume | |
| Sealed | 25.5-35.4 liters / 0.9-1.25 cu.ft. |
| Vented | 36.8-139 liters / 1.3-4.9 cu.ft. |
| Driver Volume Displaced | 0.071 cu.ft. / 2 liters |
| Overall Diameter | 12.03″, 305.6 mm |
| Baffle Hole Diameter | 11.07″, 281.2 mm |
| Front Sealing Gasket | Yes |
| Rear Sealing Gasket | Yes |
| Mounting Holes Diameter | 0.25″, 6.4mm |
| Mounting Holes B.C.D. | 11.59″, 294.4mm |
| Depth | 5.5″, 139.7 mm |
| Net Weight | 7.5 lbs, 3.4 kg |
| Shipping Weight | 9.7 lbs, 4.4 kgs |
| MATERIALS OF CONSTRUCTION | |
| Coil Construction | Copper voice coil |
| Coil Former | Polyimide former |
| Magnet Composition | Ferrite magnet |
| Core Details | Vented and extended core |
| Basket Materials | Pressed steel basket |
| Cone Composition | Paper cone |
| Cone Edge Composition | Cloth cone edge |
| Dust Cap Composition | Solid composition paper dust cap |
