(Click for full size picture, or, click for more pictures here.)

Heavy duty, long excursion subwoofer for compact car or home audio cabinets.

Features:

Large Santoprene Rubber Roll (sewn to come after attachment with Super Glue - will never come off).*
Rigid, ultra tough, crack and tear resistant talc reinforced polypropylene cone body with excellent damping.*
Original ProBox logo’d dust cap (plain dust cap available.)*
2 1/2″ high temperature voice coil with heavy duty Kapton voice coil former.*
Extra heavy 16 ga. steel black powder coated basket.*
Large diameter heavy poly-cotton flat spider, with Nomex reinforcement.*
Extended, vented pole piece for good heat dissipation. 1″ dia. Vent for quiet operation.*
Heavy (3/8″ thick) top and back plate for efficient magnetics and good heat dissipation.*
One piece “mount hider” flexible PVC gasket.*
Solder / push-on tab terminals with pre-attached 14 ga. 2 ½ ft. zip cord.
Large Xmax and double stacked magnet structure for added excursion.
Frequency response from 25 Hz (cabinet dependent) to 2.3 kHz.
400 watts RMS / 800 watts max.*
4Ω impedance.
Excellent subwoofer for small enclosures (see curves).
Built in the USA by Credence Speakers, Inc. (All “*” parts also Made in USA.)
Individually tested for proper operation @ PR Audio.

Overall diameter = 12 1/2″ (304.8mm)
Baffle cutout diameter = 11 3/32″ (281.8 mm)
Mounting depth = 5 9/16″ (141.3 mm) 

Thiele-Small data 
 
Fs = 22.09 Hz
Qms = 6.860
Qes = 0.3536
Qts = 0.3363
Vas = 105.93 Liters
Cms = 0.3032E-03 M/N
Re = 3.88 Ohms
BL = 16.147 N/A
Sd = 0.049876 Sq. Meters
Mms = 0.0171204 Kg
Ref Efficiency = 0.3103 %
Predicted Output = 87.118 dB/1W/1M
Predicted Sensitivity = 87.26 dB/2.00v/1M
(also see curve below)
Le = 3.46mH

Xmax = 11.8mm (0.465”)
Xmech = 30mm p-p (1.18”) (very conservative).

Measurement conditions:

Broken in 12+ hours, Rest 12+ hours.
Temperature = 19.5° C,   Humidity = 50%

Frequency response in typical boxes:

(Exceptional car system: very clean, usable in-car output to below 20 Hz.  No
high pass filter necessary.)
 

(Use this vented system with an 18-20 Hz, 18dB/octave or steeper high pass filter. 

Is this system going low, or what?!!)  The port would need to be  = 4″ I.D. /  24.5″ long or, better if you have room, 5″ I.D. / 39″ long.  (Yes, that’s quite a port.)

For more box projections and information, click here.

Price:

$75.00 each, 2/$140.
Our prices include packaging (double boxing) and shipping will be at actual cost, plus a small handling fee if your total order is under $100 (see ordering details here.)

More Pictures: (click on pictures to enlarge) 

Notes: 

*Power handling will be somewhat dependent on the enclosure you use.  A small sealed box will tend to limit overexcursion on the low end, but is also subject to the greatest heat buildup.  Vented boxes require use of a sharp high pass filter to minimize inputs below the box tuning frequency, for high power usage.  

 
**The projections shown assume an upper bass driver crossed over to the sub, and adjusted for the same level as the nominal driver.  For a curve showing near field mic’d curves of this woofer in an actual box (or baffle), click here.