Specification:
Nominal Basket Diameter: 12 in., 304.8mm

Nominal Impedance: 8 ohms

Power Rating: Watts 250W

Music Program: 500W

Resonance: 47Hz

Usable Frequency Range: 43Hz-3.8kHz

Sensitivity***: 98

Magnet Weight: 38 oz.

Gap Height: 0.312 in., 7.92mm

Voice Coil Diameter: 2 in., 50.8mm

Thiele & Small Parameters
Resonant Frequency (fs): 47Hz

DC Resistance (Re): 5.0

Coil Inductance (Le): 0.64mH

Mechanical Q (Qms): 6.00

Electromagnetic Q (Qes): 0.50

Total Q (Qts): 0.46

Compliance Equivalent Volume (Vas): 120.1 liters / 4.2 cu. ft.

Peak Diaphragm Displacement Volume (Vd): 237cc

Mechanical Compliance of Suspension (Cms): 0.29mm/N

BL Product (BL): 10.8 T-M

Diaphram Mass inc. Airload (Mms): 40 grams

Efficiency Bandwidth Product (EBP): 94

Maximum Linear Excursion (Xmax): 4.4mm

Surface Area of Cone (Sd): 538.9 cm2

Maximum Mechanical Limit (Xlim): 11mm

Mounting Information
Recommended Enclosure:
- Sealed: 25.5-35.4 liters, 0.9-1.25 cu.ft.
- Vented: 36.8-139 liters/1.3-4.9 cu.ft.

Overall Diameter: 12.03 in., 305.5mm

Baffle Hole Diameter: 10.95 in., 278.1mm

Front Sealing Gasket: fitted as standard

Rear Sealing Gasket: fitted as standard

Mounting Holes Diameter: 0.25 in., 6.4mm

Mounting Holes B.C. D.: 11.59 in., 294.3mm

Depth: 4.57 in., 116mm

Net Weight: 7.5 lbs., 3.4 kg

Shipping Weigh: 9.7 lbs., 4.4 kg

Materials of Construction
Coil Construction: Copper voice coil

Coil Former: Polyimide former

Magnet Composition: Ferrite magnet

Core Details: Vented and extended core

Basket Materials: Pressed steel basket

Cone Composition: Paper Cone

Cone Edge Composition: Cloth cone edge

Dustcap Composition: Solid composition paper dust cap

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

*** The average output across the usable frequency range when applying 1W/1M into the nominal impedance. Ie: 2.83V/8ohms, 4V/16ohms. 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 | 2ft. X 2ft. 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(TM) CX2008 are coaxial speakers with tweeter sold separately. Published Usable Frequency response contingent upon use of APT 50 HF Driver.

Important Note

Watts: The guaranteed long term power rating throughout the usable frequency range of the speaker.

(Translation: the speaker will operate continuously at any frequency within the speakers specified frequency range when driven at this power. The "Watts" rating is similar to RMS, but is really more indicative of long term thermal capability.)

Music Program: The speaker will safely and reliably handle the varying frequencies of musical content at this power rating. The "Music Program" rating is more indicative of what you can expect in the real world with the speaker operating within the appropriate enclosure reproducing music or vocal audio program.

Dimensions and Weight in Packaging

8 Ohms

Shipping Weight: 9.46 lbs

Shipping Dimensions: 14 x 14 x 7 in

Manufacturer Part Number (MPN): BETA12A8