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WWW.PRECISIONPOWER.COM 

 

Thank you for choosing 

Precision

Power

 

woofers. Designed and 

engineered in the USA, this product combines innovative technol-
ogy with the finest materials to consistently deliver 

Absolutely State 

of the Art

™ performance, sound quality, reliability, and value. This 

  

Precision

Power

 

product reflects our commitment to offer you 

unparalleled performance and quality for years of dependable ser-
vice and listening enjoyment. 

Features, Parameters, & Dimensions 

series wired  

S.12 

S.15 

Fs

 (

Hz)

 

22.89 19.52 

Qms

  

3.57 4.279 

Vas (

ft³

)

  

3.34 5.076 

Cms (mm/N)

  

0.266 0.146 

Mms (g)

  

181.5 456.7 

Rms (kg/s)

  

7.311 13.09 

Xmax (mm)

  

8.1 8.1 

Xmech (mm) 

12.15 12.15 

Piston Diameter (in) 

11.26 12.83 

Sd (in²)

  

77.5 129.2 

Qes

  

0.755 0.933 

Re

 

(

7.2 7.2 

Z

 

(

)

 

8 8 

BL (Tm)

  

15.78 20.79 

Rms Power

 

(watts)

 

250 300 

Qts

  

0.623 0.766 

NO (%) 

0.145 0.111 

1w/1m SPL

 

(dB)

 

83.64 82.47 

2.8V SPL (dB) 

84.22 83.06 

Voice Coil Diameter (in) 

2” 2” 

Impedance (

DVC 4

 DVC 

4

 

M-vd (ft.

3

0.0956 0.174 

Injection Molded Polypropylene/Mica 

Cone & Dust Cap 

ABS Gasket 

2” 4-layer VC on Kapton Former 

Quick Disconnect Terminals 

CONEX Composite Spiders 

Stamped Steel Frame  

Vented T-Yoke Back-plate 

WWW.PRECISIONPOWER.COM 

 

Included in this manual are a number of different enclosure sugges-
tions. These are by no means the only enclosures to use, but they 
provide a starting point to determine the correct enclosure for your 
needs many factors must be addressed (amount of power, vehicle, 
placement, crossovers, etc) Therefore, as always 

Precision

Power 

recommends that your subwoofer be installed by an authorized 

Precision

Power 

dealer. 

Enclosure Dimensions 

All enclosures should be made of .75” (3/4”) material only. When 
possible, make the baffle 1.5” (1 ½) thick and add .75” (3/4”) to the 
depth of the enclosure to compensate. All volumes INCLUDE vent/
port and subwoofer displacements. DO NOT change the volume 
unless you plan on adding a substantial amount of bracing. For 
added performance, applying a coat of fiberglass resin to the interior 
walls will greatly improve sealing the enclosure. Adding a thin layer 
of poly-fill will improve response by smoothing out reflections 

within the enclosure. 

Enclosure Construction 

Enclosure Recommendations 

S.12 Sealed 

S.12 Ported 

Vol. 

(ft.

3

Dimensions 

(H x L x D) 

QTC 

-3dB 

(Hz) 

Vol. 

(ft.

3

Port 

(dia. X L) 

Freq. 

(Hz) 

-3dB 

(Hz) 

1.00  13x14.75x13  1.221  35.5  2.00 

4” x 12” 

35 

30.1 

1.50  13x21.25x13  1.056  31.2  2.50 

4” x 12” 

28.1  25.8 

2.00  13x27.75x13  0.962  30.2  3.00 

4” x 12” 

25.9  23.9 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

S.15 Sealed 

S.15 Ported 

Vol. 

(ft.

3

Dimensions 

(H x L x D) 

QTC 

-3dB 

(Hz) 

Vol. 

(ft.

3

Port  

(dia. X L) 

Freq. 

(Hz) 

-3dB 

(Hz) 

2.00 

18x17.5x15   1.361   27.1  3.00 

4” x 12” 

28.8  25.2 

3.00 

18x25x15  

1.178   24.2  4.00 

4” x 12” 

24.7  21.5 

4.00 

18x33x15  

1.076   22.7  5.00 

4” x 12” 

22 

19 

Dimensions 

(H x L x D) 

14x23.75x14 

14x29.25x14 
14x34.75x14 

 
 

Dimensions 

(H x L x D) 

17x23.25x17  

17x30.5x17  
17x37.5x17  

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