Eminence Alpha-12A 12" Guitar/PA Driver
Best box: 97.2 L bass reflex tuned to 41.6 Hz · F3 57.7 Hz
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Comparable 12.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Eminence Alpha-12A 12" Guitar/PA Driver does not fit your target box volume or tuning. Each entry links to its full enclosure design and Thiele/Small parameters.
⚠️ Engineering Notice for Builders
- Limited linear excursion (Xmax: 2.4 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 97.2 Liters |
| Tuning Frequency (Fb) | 41.6 Hz |
| F3 (-3 dB Cutoff) | 57.7 Hz |
| F6 / F10 Extension | 48.5 Hz / 37.9 Hz |
| Port Inner Diameter | Ø 7.5 cm |
| Port Physical Length | 2.5 cm |
| First Pipe Resonance | 6852.0 Hz |
| Estimated MOL @ F3 | 110.0 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.77 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.089; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 121.5 Liters |
| System Q (Qtc) | 1.089 (above Butterworth: Qtc cannot fall below Qts (0.77)) |
| System Resonance (Fc) | 69.3 Hz |
| F3 (-3 dB Cutoff) | 54.0 Hz |
| F6 / F10 Extension | 45.1 Hz / 36.4 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 49.0 Hz |
| Total Q (Qts) | 0.77 |
| Electrical Q (Qes) | 0.873 |
| Mechanical Q (Qms) | 6.53 |
| Equivalent Volume (Vas) | 121.5 Liters |
| Diaphragm Area (Sd) | 519.5 cm² |
| DC Resistance (Re) | 6.3 Ω |
| Efficiency Bandwidth Product (EBP) | 56.1 |
| Linear Excursion (Xmax) | 2.4 mm |
| Thermal Power (Pe) | 150.0 W |
| Nominal Diameter | 12.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Eminence Alpha-12A 12" Guitar/PA Driver?
Load Forge's calculated alignment puts Eminence Alpha-12A 12" Guitar/PA Driver in a 97.2 liter vented enclosure tuned to 41.6 Hz, reaching an F3 cutoff of approximately 57.7 Hz.
Can Eminence Alpha-12A 12" Guitar/PA Driver be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 121.5 liters with a Qtc of 1.089 (above Butterworth: Qtc cannot fall below Qts (0.77)), the system exhibits an F3 of 54.0 Hz.
What port dimensions should be used for Eminence Alpha-12A 12" Guitar/PA Driver to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 7.5 cm with a length of 2.5 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
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