Eminence 820H 8" Lead / Rhythm Guitar Speaker
Best box: 19.2 L bass reflex tuned to 110.2 Hz · F3 121.6 Hz
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Comparable 8.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Eminence 820H 8" 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
- The textbook alignment (7.7 L at 122.4 Hz) would need a 4.6 cm port; the recommendation is retuned to 19.2 L at 110.2 Hz so the port can be built.
- Limited linear excursion (Xmax: 1.59 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) | 19.2 Liters |
| Tuning Frequency (Fb) | 110.2 Hz |
| F3 (-3 dB Cutoff) | 121.6 Hz |
| F6 / F10 Extension | 94.7 Hz / 82.2 Hz |
| Port Inner Diameter | Ø 10.0 cm |
| Port Physical Length | 2.9 cm |
| First Pipe Resonance | 5837.0 Hz |
| Estimated MOL @ F3 | 113.6 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.88 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.245; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 9.6 Liters |
| System Q (Qtc) | 1.245 (above Butterworth: Qtc cannot fall below Qts (0.88)) |
| System Resonance (Fc) | 203.6 Hz |
| F3 (-3 dB Cutoff) | 160.5 Hz |
| F6 / F10 Extension | 135.9 Hz / 111.2 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 144.0 Hz |
| Total Q (Qts) | 0.88 |
| Electrical Q (Qes) | 0.923 |
| Mechanical Q (Qms) | 18.78 |
| Equivalent Volume (Vas) | 9.6 Liters |
| Diaphragm Area (Sd) | 230.9 cm² |
| DC Resistance (Re) | 3.64 Ω |
| Efficiency Bandwidth Product (EBP) | 156.0 |
| Linear Excursion (Xmax) | 1.6 mm |
| Thermal Power (Pe) | 40.0 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 820H 8" Lead / Rhythm Guitar Speaker?
Load Forge's calculated alignment puts Eminence 820H 8" Lead / Rhythm Guitar Speaker in a 19.2 liter vented enclosure tuned to 110.2 Hz, reaching an F3 cutoff of approximately 121.6 Hz.
Can Eminence 820H 8" Lead / Rhythm Guitar Speaker be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 9.6 liters with a Qtc of 1.245 (above Butterworth: Qtc cannot fall below Qts (0.88)), the system exhibits an F3 of 160.5 Hz.
What port dimensions should be used for Eminence 820H 8" 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 2.9 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
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