Guitar / Bass

Bass Guitar

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The Eminence Commonwealth 12 inch is the perfect guitar speaker for southern rock or blues guitarist. Warm and rich, but very clean and well defined with great presence Full and smooth, with very little cone break-up, but likes Overdrive.

response graph

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Suggested Retail  $184.99
Your Price  $174.99

For continental USA shipments only.

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  • 7-Year Warranty*
*Warranty policy may vary outside the USA.
This table charts the specifications for the COMMONWEALTH™ 12 speaker
Speaker Detail
Nominal Basket Diameter12", 305 mm
Nominal Impedance*8 Ω
Power Rating**
Watts225 W
Music ProgramN/A
Resonance50 Hz
Usable Frequency Range50 Hz - 4 kHz
Sensitivity***100 dB
Magnet Weight109 oz.
Gap Height0.29", 7.4 mm
Voice Coil Diameter4", 102 mm
Thiele & Small Parameters
Resonant Frequency (fs)50 Hz
DC Resistance (Re)6.34 Ω
Coil Inductance (Le)0.46m H
Mechanical Q (Qms)6.61
Electromagnetic Q (Qes)0.35
Total Q (Qts)0.33
Compliance Equivalent Volume (Vas)90.2 liters / 3.19 cu.ft.
Peak Diaphragm Displacement Volume (Vd)36.4 cc
Mechanical Compliance of Suspension (Cms)0.24 mm/N
BL Product (BL)15.7 T-M
Diaphragm Mass Inc. Airload (MMs)43 grams
Efficiency Bandwidth Product (EBP)143
Maximum Linear Excursion (Xmax)0.7 mm
Surface Area of Cone (Sd)519.5 cm2
Maximum Mechanical Limit (Xlim)N/A
Mounting Information
Recommended Enclosure Volume
Sealed Acceptable
Vented Acceptable
Driver Volume Displaced0.104 cu.ft. / 2.94 liters
Overall Diameter12.29", 312.2 mm
Baffle Hole Diameter11.06", 280.9 mm
Front Sealing GasketYes
Rear Sealing GasketN/A
Mounting Holes Diameter0.27", 6.9mm
Mounting Holes B.C.D.11.69", 296.9mm
Depth5", 127 mm
Net Weight21.5 lbs, 9.75 kg
Shipping Weight23.2 lbs, 10.52 kgs
Materials of Construction
Coil ConstructionAluminum voice coil
Coil FormerPolyimide former
Magnet CompositionFerrite magnet
Core DetailsVented core
Basket MaterialsDie-cast aluminum basket
Cone CompositionPaper cone
Cone Edge CompositionCloth cone edge
Dust Cap CompositionAluminum dust cap

* Please consult for specifications of models with alternative impedances.

** Multiple units exceed published rating evaluated under EIA 426A noise source and test standard while in a free-air, nontemperature-controlled environment.

*** The average output across the usable frequency range when applying 1W/1m into the nominal impedance. ie: 2.83 V /8 ohms, 4 V /16 ohms. Eminence response curves are measured under the following conditions: All speakers are tested at 1W/1m using a variety of test set-ups for the appropriate impedance | LMS using 0.25" supplied microphone (software calibrated) mounted 1m from wall/baffle | 2 ft. x 2 ft. baffle is built into the wall with the speaker mounted flush against a steel ring for minimum diffraction | Hafler P1500 Trans-Nova amplifier | 2700 cu. ft. chamber with fiberglass on all six surfaces (three with custom-made wedges).

**** BETA 8CX, 10CX, 12CX and ACOUSTINATOR™ CX 2008 are coaxial speakers with tweeter sold separately. Published Usable Frequency response contingent upon use of APT 50 HF Driver.

***** Multiple units exceeded published rating evaluated under AES 500 and AES 800 noise sources and test standards while mounted on Eminence's TI-2000 horn in a nontemperature-controlled environment.

****** The average on axis output across the entire usable frequency range when applying 1W/1m into the nominal impedance while mounted on a Community SH 494 horn measured with: LMS (software calibrated) using a 0.25" [6.4mm] supplied microphone mounted 1m from horn mouth, Hafler P1500 Trans-Nova amplifier, 2700 cu.ft. chamber w/fiberglass on all six surfaces (three with custom made wedges). Plane-wave tube response and impedance curves measured with LMS on a 0.75" [19.1mm] diameter tube with adapter to allow for smooth transition to throat diameter and 1W/1m into nominal impedance. Prices and Specifications Subject to Change Without Notice.