Vented Specialist

Eminence EMIREDPRIVA

Best box: 27.0 L bass reflex tuned to 81.6 Hz · F3 109.2 Hz

Predicted SPL response of the Eminence EMIREDPRIVA in the recommended 27.0 L bass reflex box versus the alternative — open it in the simulator Open and tweak this box live ↗

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Estimated retail 88.26 GBP · Check price & availability ↗

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⚠️ Engineering Notice for Builders

  • Limited linear excursion (Xmax: 1.2 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) 27.0 Liters
Tuning Frequency (Fb) 81.6 Hz
F3 (-3 dB Cutoff) 109.2 Hz
F6 / F10 Extension 90.6 Hz / 70.6 Hz
Port Inner Diameter Ø 7.5 cm
Port Physical Length 2.0 cm
First Pipe Resonance 8585.0 Hz
Estimated MOL @ F3 114.3 dB SPL
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Sealed (Acoustic Suspension) — compromise

SUITS INFINITE / OPEN BAFFLE

With Qts 0.69 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 0.976; for a flat response this driver is better used on an infinite (IB) or open baffle.

Net Box Volume (Vb) 33.7 Liters
System Q (Qtc) 0.976 (above Butterworth)
System Resonance (Fc) 135.8 Hz
F3 (-3 dB Cutoff) 107.1 Hz
F6 / F10 Extension 87.7 Hz / 69.9 Hz
Air Spring Linearity High (Zero port compression)
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Thiele/Small Parameters

Resonance (Fs) 96.0 Hz
Total Q (Qts) 0.69
Electrical Q (Qes) 0.717
Mechanical Q (Qms) 18.19
Equivalent Volume (Vas) 33.7 Liters
Diaphragm Area (Sd) 519.5 cm²
DC Resistance (Re) 7.01 Ω
Efficiency Bandwidth Product (EBP) 133.9
Linear Excursion (Xmax) 1.2 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 EMIREDPRIVA?

Load Forge's calculated alignment puts Eminence EMIREDPRIVA in a 27.0 liter vented enclosure tuned to 81.6 Hz, reaching an F3 cutoff of approximately 109.2 Hz.

Can Eminence EMIREDPRIVA be used in a sealed box?

Yes. In a sealed (acoustic suspension) enclosure of 33.7 liters with a Qtc of 0.976 (above Butterworth), the system exhibits an F3 of 107.1 Hz.

What port dimensions should be used for Eminence EMIREDPRIVA to avoid port chuffing?

Sized from cone displacement (Sd × Xmax), a minimum port diameter of 7.5 cm with a length of 2.0 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.

Shareable Acoustic Card for Forums & Social Media

Embed this design card on DIYAudio, AVSForum, Reddit, or Facebook. It shows the calculated F3, MOL (when the power rating is published) and box parameters.

Eminence EMIREDPRIVA Enclosure Card
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