Eminence LEGEND GB128 12" Lead / Rhythm Guitar Speaker
Best box: 35.1 L bass reflex tuned to 73.1 Hz · F3 96.6 Hz
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Comparable 12.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Eminence LEGEND GB128 12" Lead / Rhythm Guitar Speaker 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: 0.8 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) | 35.1 Liters |
| Tuning Frequency (Fb) | 73.1 Hz |
| F3 (-3 dB Cutoff) | 96.6 Hz |
| F6 / F10 Extension | 79.5 Hz / 61.9 Hz |
| Port Inner Diameter | Ø 10.0 cm |
| Port Physical Length | 5.4 cm |
| First Pipe Resonance | 3184.0 Hz |
| Estimated MOL @ F3 | 110.1 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.65 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 0.919; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 43.9 Liters |
| System Q (Qtc) | 0.919 (above Butterworth) |
| System Resonance (Fc) | 121.6 Hz |
| F3 (-3 dB Cutoff) | 97.6 Hz |
| F6 / F10 Extension | 79.2 Hz / 62.6 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 86.0 Hz |
| Total Q (Qts) | 0.65 |
| Electrical Q (Qes) | 0.672 |
| Mechanical Q (Qms) | 19.54 |
| Equivalent Volume (Vas) | 43.9 Liters |
| Diaphragm Area (Sd) | 506.7 cm² |
| DC Resistance (Re) | 6.37 Ω |
| Efficiency Bandwidth Product (EBP) | 127.9 |
| Linear Excursion (Xmax) | 0.8 mm |
| Thermal Power (Pe) | 50.0 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 LEGEND GB128 12" Lead / Rhythm Guitar Speaker?
Load Forge's calculated alignment puts Eminence LEGEND GB128 12" Lead / Rhythm Guitar Speaker in a 35.1 liter vented enclosure tuned to 73.1 Hz, reaching an F3 cutoff of approximately 96.6 Hz.
Can Eminence LEGEND GB128 12" Lead / Rhythm Guitar Speaker be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 43.9 liters with a Qtc of 0.919 (above Butterworth), the system exhibits an F3 of 97.6 Hz.
What port dimensions should be used for Eminence LEGEND GB128 12" Lead / Rhythm Guitar Speaker to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 10.0 cm with a length of 5.4 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
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