The Eminence Commonwealth 12\" 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.
|Nominal Basket Diameter||12", 305 mm|
|Nominal Impedance*||8 Ω|
|Usable Frequency Range||50 Hz - 4 kHz|
|Magnet Weight||109 oz.|
|Gap Height||0.29", 7.4 mm|
|Voice Coil Diameter||4", 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|
|Recommended Enclosure Volume|
|Driver Volume Displaced||0.104 cu.ft. / 2.94 liters|
|Overall Diameter||12.29", 312.2 mm|
|Baffle Hole Diameter||11.06", 280.9 mm|
|Front Sealing Gasket||Yes|
|Rear Sealing Gasket||N/A|
|Mounting Holes Diameter||0.27", 6.9mm|
|Mounting Holes B.C.D.||11.69", 296.9mm|
|Depth||5", 127 mm|
|Net Weight||21.5 lbs, 9.75 kg|
|Shipping Weight||23.2 lbs, 10.52 kgs|
|Materials of Construction|
|Coil Construction||Aluminum voice coil|
|Coil Former||Polyimide former|
|Magnet Composition||Ferrite magnet|
|Core Details||Vented core|
|Basket Materials||Die-cast aluminum basket|
|Cone Composition||Paper cone|
|Cone Edge Composition||Cloth cone edge|
|Dust Cap Composition||Aluminum dust cap|
* Please consult www.eminence.com 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.