Eminence EMIBETA8A
Best box: 23.3 L sealed · Fc 91.9 Hz · F3 82.7 Hz
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Comparable 8.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Eminence EMIBETA8A 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: 3.0 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Textbook Bass Reflex — not recommended (10.4 dB bass hump)
PORT BUILDABLE| Net Box Volume (Vb) | 18.6 Liters |
| Tuning Frequency (Fb) | 55.2 Hz |
| F3 (-3 dB Cutoff) | 95.8 Hz |
| F6 / F10 Extension | 91.1 Hz / 84.2 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 6.8 cm |
| First Pipe Resonance | 2526.0 Hz |
| Estimated MOL @ F3 | 110.1 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 8.0 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 11.314; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 23.3 Liters |
| System Q (Qtc) | 11.314 (above Butterworth: Qtc cannot fall below Qts (8.00)) |
| System Resonance (Fc) | 91.9 Hz |
| F3 (-3 dB Cutoff) | 82.7 Hz |
| F6 / F10 Extension | 79.6 Hz / 74.9 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 65.0 Hz |
| Total Q (Qts) | 8.0 |
| Electrical Q (Qes) | 8.637 |
| Mechanical Q (Qms) | 108.49 |
| Equivalent Volume (Vas) | 23.3 Liters |
| Diaphragm Area (Sd) | 210.0 cm² |
| DC Resistance (Re) | 5.99 Ω |
| Efficiency Bandwidth Product (EBP) | 7.5 |
| Linear Excursion (Xmax) | 3.0 mm |
| Thermal Power (Pe) | N/A W |
| Nominal Diameter | 8.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Eminence EMIBETA8A?
A simple ported box is not recommended for Eminence EMIBETA8A: the textbook alignment (18.6 liters tuned to 55.2 Hz) needs a 6.8 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 EMIBETA8A be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 23.3 liters with a Qtc of 11.314 (above Butterworth: Qtc cannot fall below Qts (8.00)), the system exhibits an F3 of 82.7 Hz.
What port dimensions should be used for Eminence EMIBETA8A to avoid port chuffing?
A straight 5.0 cm port would need 6.8 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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