Guitar Bass Pro Audio Custom / OEM
 
DELTA-12A    
SPECIFICATION  
Nominal Basket Diameter 12", 304.8mm
Nominal Impedance* 8 ohms
Power Rating  
Watts 400W
Music Program 800W
Resonance 55Hz
Usable Frequency Range 54Hz-5kHz
Sensitivity*** 98.3
Magnet Weight 56 oz.
Gap Height 0.375", 9.53mm
Voice Coil Diameter 2.5", 63.5mm
   
THIELE & SMALL PARAMETERS  
Resonant Frequency (fs) 55Hz

Download PDF Spec Sheet

 

 

Download PDF Cabinet Design

 
DC Resistance (Re) 6.3
Coil Inductance (Le) 0.74mH
Mechanical Q (Qms) 5.27
Electromagnetic Q (Qes) 0.46
Total Q (Qts) 0.43
Compliance Equivalent Volume (Vas) 81.3 liters / 2.9 cu.ft.
Peak Diaphragm Displacement Volume (Vd) 125cc
Mechanical Compliance of Suspension (Cms) 0.21mm/N
BL Product (BL) 13.5 T-M
Diaphram Mass inc. Airload (Mms) 39 grams
Efficiency Bandwidth Product (EBP) 120
Maximum Linear Excursion (Xmax) 2.4mm
Surface Area of Cone (Sd) 519.5 cm2  
Maximum Mechanical Limit (Xlim) 9.9mm  
     
MOUNTING INFORMATION    
Recommended Enclosure    
Sealed N/A  
Vented 25.5-85 liters/0.9-3 cu.ft.  
Overall Diameter 12.03", 305.5mm  
Baffle Hole Diameter 10.95", 278.1mm  
Front Sealing Gasket Fitted as standard  
Rear Sealing Gasket Fitted as standard  
Mounting Holes Diameter 0.25", 6.4mm  
Mounting Holes B.C. D. 11.59", 294.3mm  
Depth 5.35", 136mm  
Net Weight 11.4 lbs., 5.2 kg  
Shipping Weight 13.5 lbs., 6.1 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 felt 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.