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
| 8ga. Compression Terminals |
Injection Molded PP/Mica Dust Cap | CONEX Spiders |
Rubber Gasket | Stamped Steel Frame |
| Vented |
series wired | A.8SQ | A.12SQ |
Fs (Hz) | 37.13 | 25.205 |
Qms | 11.69 | 12.07 |
Vas (ft³) | 0.603 | 3.381 |
Cms (mm/N) | 0.301 | 0.293 |
Mms (g) | 61.1 | 136.261 |
Rms (kg/s) | 1.22 | 1.786 |
Xmax (mm) | 9 | 13.85 |
Xmech (mm) | 13.5 | 20.78 |
Piston Diameter (in) | 7.17 | 9.729 |
Sd (in²) | 31 | 74.4 |
Qes | 0.616 | 0.612 |
Re (Ω) | 7.2 | 7.2 |
Z (Ω) | 8 | 8 |
BL (Tm) | 12.91 | 15.933 |
Rms Power (watts) | 180 | 300 |
Qts | 0.585 | 0.583 |
NO (%) | 0.137 | 0.242 |
1w/1m SPL (dB) | 83.39 | 85.85 |
2.8V SPL (dB) | 83.97 | 86.44 |
Voice Coil Diameter (in) | 2” | 2.5” |
Impedance (Ω) | DVC 4Ω | DVC 4Ω |
0.0537 | 0.177 |
Enclosure Dimensions
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 Construction
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
Enclosure Recommendations
| A.8SQ Sealed |
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| A.8SQ Ported |
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Vol. | Dimensions | QTC | Vol. | Dimensions | Port | Freq. | ||
(ft.3) | (H x L x D) | (Hz) | (ft.3) | (H x L x D) | (dia. X L) | (Hz) | (Hz) | |
0.40 | 10x9.25x12 | 0.902 | 50.2 | 0.50 | 10x12.75x10.75 | 2” X 8” | 40.8 | 40.1 |
0.60 | 10x13.25x12 | 0.799 | 47.9 | 0.75 | 10x18x10.75 | 2” X 8” | 33.1 | 34.1 |
0.80 | 10x17x12 | 0.747 | 47.2 | 1.00 | 10x23.5x10.75 | 2” X 8” | 28.4 | 31.2 |
| A.12SQ Sealed |
|
| A.12SQ Ported |
|
| ||
Vol. | Dimensions | QTC | Vol. | Dimensions | Port | Freq. | ||
(ft.3) | (H x L x D) | (Hz) | (ft.3) | (H x L x D) | (dia. X L) | (Hz) | (Hz) | |
1.00 | 13x14.75x13 | 1.144 | 39.7 | 2.00 | 14x23.75x14 | 4” x 12” | 34.8 | 31.9 |
1.50 | 13x21.25x13 | 0.992 | 36.1 | 2.50 | 14x29.25x14 | 4” x 12” | 31 | 28.5 |
2.00 | 13x27.75x13 | 0.904 | 34.3 | 3.00 | 14x34.75x14 | 4” x 12” | 28.2 | 26 |
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