Eminence EMIALPHA2A
Best box: 0.18 L sealed · Fc 263.0 Hz · F3 211.5 Hz
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Comparable 2.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Eminence EMIALPHA2A 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: 1.7 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Textbook Bass Reflex — not recommended (4.8 dB bass hump)
PORT BUILDABLE| Net Box Volume (Vb) | 1.5 Liters |
| Tuning Frequency (Fb) | 158.1 Hz |
| F3 (-3 dB Cutoff) | 146.3 Hz |
| F6 / F10 Extension | 138.7 Hz / 129.3 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 12.1 cm |
| First Pipe Resonance | 1419.0 Hz |
| Estimated MOL @ F3 | 97.4 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.72 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.018; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 0.18 Liters |
| System Q (Qtc) | 1.018 (above Butterworth: Qtc cannot fall below Qts (0.72)) |
| System Resonance (Fc) | 263.0 Hz |
| F3 (-3 dB Cutoff) | 211.5 Hz |
| F6 / F10 Extension | 172.6 Hz / 137.1 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 186.0 Hz |
| Total Q (Qts) | 0.72 |
| Electrical Q (Qes) | 0.942 |
| Mechanical Q (Qms) | 3.06 |
| Equivalent Volume (Vas) | 0.2 Liters |
| Diaphragm Area (Sd) | 12.4 cm² |
| DC Resistance (Re) | 6.4 Ω |
| Efficiency Bandwidth Product (EBP) | 197.5 |
| Linear Excursion (Xmax) | 1.7 mm |
| Thermal Power (Pe) | 20.0 W |
| Nominal Diameter | 2.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Eminence EMIALPHA2A?
A simple ported box is not recommended for Eminence EMIALPHA2A: the textbook alignment (1.5 liters tuned to 158.1 Hz) needs a 12.1 cm port, and no nearby retune stays buildable without a bass hump. A sealed box, a passive radiator or a folded duct is the practical choice.
Can Eminence EMIALPHA2A be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 0.18 liters with a Qtc of 1.018 (above Butterworth: Qtc cannot fall below Qts (0.72)), the system exhibits an F3 of 211.5 Hz.
What port dimensions should be used for Eminence EMIALPHA2A to avoid port chuffing?
A straight 5.0 cm port would need 12.1 cm of length, which does not fit a practical cabinet. Use a passive radiator or a folded/3D duct instead of a straight tube.
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