<p><strong>Package Includes:</strong></p> <ul> (2) Alpine R2-W8D2 8” R-Series 350W RMS Subwoofer Dual 2 Ohm Car Audio Sub R2W8D2</li> (1) Rockville RQB8 Dual 8" Vented Subwoofer Sub Box Enclosure Finished w/Bed Liner</li> (1) Dual Sub Box Enclosure Installation Kit: Speaker Wire, Screws, Spade Terminals</li> </ul> <p><strong>Description of R2-W8D2:</strong></p> <p> The next generation of sound performance is here with the new R-Series subwoofers featuring a larger motor structure for more accurate and authoritative bass. </p> <p><strong>Features of R2-W8D2:</strong></p> <ul> <li><strong>New Motor Structure</strong><br> The new R-Series subwoofers now feature larger, double-stacked magnets that contribute more motor force for deeper bass and tighter bass control compared to the previous generation.</li> <li><strong>Oversized Dust Cap</strong><br> The new hybrid poly ceramic composite dust cap ensures rigidity while also providing incredible internal damping (vibration absorption) to smooth out the bass response and reproduce tight bass.</li> <li><strong>Increased Accuracy</strong><br> Alpine's High Amplitude Multi-Roll (HAMR) Surround Technology allows the cone to efficiently move air while staying cool resulting in incredible accuracy from the subwoofer.</li> </ul> <p><strong>Specifications:</strong></p> <ul> <li>Size: 8"</li> <li>Dimensions: 7.64" x 7.64" x 4.56"</li> <li>Frequency Response: 30Hz - 200Hz</li> <li>Power Range: 150W - 350W RMS</li> <li>Power Handling: 350W RMS / 1000W Peak</li> <li>Magnet Weight: 56 oz</li> <li>Voice Coil Diameter: 40 mm (2.6")</li> </ul> <p><strong>THIELE-SMALL PARAMETERS</strong><br></p> <ul> <li>Sensitivity (1W/1m): 83.6 dB</li> <li>DC Resistance (Re): 1.8? + 1.8?</li> <li>Free Air Resonance (Fs): 42 Hz</li> <li>Equivalent Stiffness: 10.1 L</li> <li>Mechanical Q (Qms): 7.69</li> <li>Electrical Q (Qes): 0.52</li> <li>Total Q (Qts): 0.48</li> <li>Cone Area (Sd): 201 cm2</li> <li>Linear Excursion (Xmax): 12 mm</li> <li>Mechanical Travel (Xmech): 52 mm</li> </ul> <p><strong>SEALED BOX RANGE</strong><br></p> <ul> <li>Net Internal Volume: 0.15 - 0.45 ft3</li> </ul> <p><strong>RECOMMENDED SEALED BOX</strong><br></p> <ul> <li>External Dimensions: 13" x 13" x 5.5"</li> <li>Gross Internal Volume: 0.30 ft3</li> <li>Net Internal Volume: 0.25 ft3</li> <li>D2 - F3, Qtc: 59Hz, 0.73</li> <li>D4 - F3, Qtc: 59Hz, 0.72</li> </ul> <p><strong>VENTED BOX RANGE</strong><br></p> <ul> <li>Net Internal Volume: 0.25 - 0.7 ft3</li> <li>Fb, Tuning: 36-40Hz</li> </ul> <p><strong>RECOMMENDED VENTED BOX</strong><br></p> <ul> <li>External Dimensions: 11" x 9.5" x 21"</li> <li>Gross Internal Volume: 0.86 ft3</li> <li>Vent Area (W x H): 8 in2 (8" x 1")</li> <li>Vent Length: 17.5"</li> <li>Vent Displacement: 0.13 ft3</li> <li>Net Internal Volume (Vb): 0.68 ft3</li> </ul> <p><strong>Features of RQB8:</strong></p> <ul> <li>Finished with Durable Bed Liner</li> <li>3/4" MDF</li> <li>High Qua