Package Includes:

• (2) Alpine R2-W8D4 8” R-Series 350W RMS Subwoofer Dual 4 Ohm Car Audio Sub R2W8D4
• (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

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Description:

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:

• 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): 83.7 dB
• DC Resistance (Re): 3.6? + 3.6?
• Free Air Resonance (Fs): 43 Hz
• Equivalent Stiffness: 10.5 L
• Mechanical Q (Qms): 7.08
• Electrical Q (Qes): 0.58
• Total Q (Qts): 0.53
• 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
• D2 - F3, Ripple, Fb: 33Hz, 2.5 dB, 39Hz
• D4 - F3, Ripple, Fb: 32Hz, 3.2 dB, 39Hz

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Features:

• Rockville RQB8 Dual 8" Vented Subwoofer Enclosure Finished w/ Bed Liner
• Finished with Durable Bed Liner
• 3/4" MDF
• High Quality Spring Loaded Terminals
• Air Space: 1.0 Cubic Feet (per sub)
• Product Dimensions (H x W x D): 13" x 28" x 13" inches
• Tuning Frequency: 40 hZ

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Complete Dual Subwoofer Enclosure Installation Kit!

Includes:

• 20 Drywall Wood Screws (Wood screws are the type of screws; the screws are actually made of metal)
• 20 Feet of 14 AWG Blue Speaker Wire
• 4 Spade Terminals

This accessory package includes everything you need to install two subwoofers into an enclosure, and wire your enclosure to your amplifier. This package is a top of the line accessory package which we put together and tested.

The drywall wood screws were hand selected by our installation experts because they drill into the enclosure very cleanly, without chipping the enclosure. The speaker wire is 14 gauge. This is way better than using 16 gauge. You can be 100 % sure that your enclosure will have a clean signal to the amplifier with this top of the line speaker wire. These spade terminals have also been hand selected by our installation experts to make the internal wiring simple, secure, and to run the audio signal cleanly.