Package Includes:

(2) Alpine R2-W8D2 8?? R-Series 350W RMS Subwoofer Dual 2 Ohm Car Audio Sub R2W8D2 (1) Rockville RQB8 Dual 8" Vented Subwoofer Sub Box Enclosure Finished w/Bed Liner (1) Dual Sub Box Enclosure Installation Kit: Speaker Wire . Screws . Spade Terminals

Description of R2-W8D2:

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.

Features of R2-W8D2:

• New Motor Structure
  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.
• Oversized Dust Cap
  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.
• Increased Accuracy
  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.

Specifications:

• Size: 8"
• Dimensions: 7.64" x 7.64" x 4.56"
• Frequency Response: 30Hz – 200Hz
• Power Range: 150W – 350W RMS
• Power Handling: 350W RMS / 1000W Peak
• Magnet Weight: 56 oz
• Voice Coil Diameter: 40 mm (2.6")

THIELE-SMALL PARAMETERS

• Sensitivity (1W/1m): 83.6 dB
• DC Resistance (Re): 1.8? + 1.8?
• Free Air Resonance (Fs): 42 Hz
• Equivalent Stiffness: 10.1 L
• Mechanical Q (Qms): 7.69
• Electrical Q (Qes): 0.52
• Total Q (Qts): 0.48
• Cone Area (Sd): 201 cm2
• Linear Excursion (Xmax): 12 mm
• Mechanical Travel (Xmech): 52 mm

SEALED BOX RANGE

• Net Internal Volume: 0.15 – 0.45 ft3

RECOMMENDED SEALED BOX

• External Dimensions: 13" x 13" x 5.5"
• Gross Internal Volume: 0.30 ft3
• Net Internal Volume: 0.25 ft3
• D2 – F3 . Qtc: 59Hz . 0.73
• D4 – F3 . Qtc: 59Hz . 0.72

VENTED BOX RANGE

• Net Internal Volume: 0.25 – 0.7 ft3
• Fb . Tuning: 36-40Hz

RECOMMENDED VENTED BOX

• External Dimensions: 11" x 9.5" x 21"
• Gross Internal Volume: 0.86 ft3
• Vent Area (W x H): 8 in2 (8" x 1")
• Vent Length: 17.5"
• Vent Displacement: 0.13 ft3
• Net Internal Volume (Vb): 0.68 ft3

Features of RQB8:

• Finished with Durable Bed Liner
• 3/4" MDF
• High Qua