• Expertly paired subwoofers, enclosure, and amplifier for optimal performance and synergy.
• Due to the nature of the items in this package, each item will be shipped individually.
• GP/Tru-Spec Enclosures assembled in the USA.
• Includes a FREE 2-Year Extended Accidental & Repair Warranty card that covers all electronics in this package.

Sundown Pair of 12" U-Series D4 Subs, Marts Digital Amp w/ Dual Vented Enclosure

This Listing Includes:

• (1) Dual 12" Vented Subwoofer Enclosure


• (2)  12" U-Series Sundown Subwoofers


• (1) Marts Digital MP-3500-1-V2 Amplifier


• (1) CPS Extended Accidental & Repair Warranty Card

Subwoofer Features:

• Black Aluminum 3" voice coil former for superior heat dissipation


• High Temperature Round-Wire ALU voice coil with high-temp black adhesive


• Double stitched surround


• Heavy duty cast baskets - all new, custom-tooled


• Spring loaded terminals accept up to 8 gauge


• Stitched-on double-XL tinsel leads


• Solid pole with vent channels and aluminum shorting ring cap


• Rear drilled gap-venting


• Innovative high-velocity cast aluminum vented frame spacer ring


• Magnet ID shorting ring


• Top-Plate Cooling Channels


• Cast Aluminum surround bolt-on rings


• Optimized for small ported or bandpass enclosures

Subwoofer Specifications U12 D4:

• RE (Ohms): 6.0577


• FS (Hz): 41.9087


• VAS (L): 14.7535


• Qes: 0.5870


• Qms: 4.9022


• Qts: 0.5242


• Le (mH): 4.3694


• BL (NA): 31.1265


• Mms (Grams): 356.5462


• Cms (uM/N): 40.4498


• Sens (dB @ 1w/1m): 84.4191

Amplifier Features

• High-performance Class D amplifier


• Immersive audio experience


• Powerful 3500 Watts output at 1 Ohm


• Compact and sleek design


• Secure seat for an electrifying sonic journey

Amplifier Technical Specifications:

• RMS Power at 1 Ohm: 1CH x 3600W


• RMS Power at 2 Ohm: 1CH x 2520W


• RMS Power at 4 Ohm: 1CH x 1500W


• Total Harmonic Distortion (THD): 0.25%


• Low Pass Filter (LPF): 80Hz-20kHz


• Subsonic Filter: 10Hz - 60Hz


• Frequency Response: 10Hz - 20kHz


• Signal-to-Noise Ratio (S/N): 83dB

Amplifier Dimensions:

• LxWxH: 10.5 x 11.5 x 3 inches


• Weigt: 9.56 lbs

Enclosure Specifications:

• Material Thickness: 0.75"


• Net Internal Volume: 3.50 ft3


• Tuning Frequency: 35 Hz


• Port Area: 52.00 inch2


• Cutout Diameter: 11.20"


• Flush Trim Diameter: 13.10"

Enclosure External Dimensions:

• Length: 34.00"


• Depth: 14.00"


• Height: 22.00"