Guitar Bass Pro Audio Custom / OEM
 
BETA-8A    
SPECIFICATION  
Nominal Basket Diameter 8", 203.2mm
Nominal Impedance* 8 ohms
Power Rating  
Watts 225W
Music Program 450W
Resonance 65Hz
Usable Frequency Range 78Hz-4.5kHz
Sensitivity*** 95.1
Magnet Weight 34 oz.
Gap Height 0.312", 7.92mm
Voice Coil Diameter 2", 50.8mm
   
THIELE & SMALL PARAMETERS  
Resonant Frequency (fs) 65Hz

Download PDF Spec Sheet

 

 

Download PDF Cabinet Design

 
DC Resistance (Re) 5.99
Coil Inductance (Le) 0.49mH
Mechanical Q (Qms) 4.95
Electromagnetic Q (Qes) 0.42
Total Q (Qts) 0.38
Compliance Equivalent Volume (Vas) 23.3 liters / 0.82 cu.ft.
Peak Diaphragm Displacement Volume (Vd) 63cc
Mechanical Compliance of Suspension (Cms) 0.37mm/N
BL Product (BL) 9.6 T-M
Diaphram Mass inc. Airload (Mms) 16 grams
Efficiency Bandwidth Product (EBP) 156
Maximum Linear Excursion (Xmax) 3.0mm
Surface Area of Cone (Sd) 210.0 cm2  
Maximum Mechanical Limit (Xlim) 7.4mm  
     
MOUNTING INFORMATION    
Recommended Enclosure    
Sealed 5.7-9.9 liters/0.2-0.35 cu.ft.  
Vented 8.5-19 liters/0.3-0.67 cu.ft.  
Overall Diameter 8.24", 209.2mm  
Baffle Hole Diameter 7.13", 181mm  
Front Sealing Gasket Fitted as standard  
Rear Sealing Gasket Fitted as standard  
Mounting Holes Diameter 0.22", 5.5mm  
Mounting Holes B.C. D. 7.75", 196.9mm  
Depth 3.5", 89mm  
Net Weight 6.6 lbs., 3 kg  
Shipping Weight 7.4 lbs., 3.4 kg  
     
MATERIALS OF CONSTRUCTION    
Coil Construction Aluminum voice coil  
Coil Former Polyimide former  
Magnet Composition Ferrite magnet  
Core Details Vented core  
Basket Materials Pressed steel basket  
Cone Composition Paper Cone  
Cone Edge Composition Cloth cone edge  
Dustcap Composition Solid composition paper dust cap  
     
FOOTNOTES    

*

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, non-temperature controlled environment.
***

The average on axis output across the usable frequency range when applying 1W/1m into the nominal impedance, i.e. 2.83V/8Ω, 4V/16Ω.  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 speaker mounted flush against a steel ring for minimum diffraction | Carver PM-120 amplifier | 2700ft3 chamber with fiberglass on all six surfaces (three with custom-made wedges).

**** BETA 8CX, 10CX, 12CX and Acoustinator™ CX2008 are coaxial speakers with tweeter sold separately. Published Usable frequency response obtained with APT50 high frequency driver attached.