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Thank you for choosing PrecisionPower
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
PrecisionPower
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 (Ω)
7.2 7.2
Z (Ω)
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 (Ω)
DVC 4Ω DVC 4Ω
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 PrecisionPower
recommends that your subwoofer be installed by an authorized
PrecisionPower 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