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Package Includes: 2 Rockville W8K9D4 8 inch Inch 2000w Car Audio Subwoofer Dual 4-Ohm Sub CEA Compliant 1 Rockville Dual 8 inch Subwoofer Box For 2007-20 GM/Chevy 1500 Crew Cab 2500HD/3500HD 1 Dual Sub Box Enclosure Installation Kit: Speaker Wire Screws Spade Terminals 1 Rockville KRYPTON-M3 4000w Peak/1000w Dyno-Certified RMS Mono 1 Ohm CarAmplifier Amp+Remote 1 Rockville RWK41 4 Gauge Complete Car Amp Wiring Installation Wire Kit with RCA’s Video of K9 6.5 and 8 Subs: Features of W8K9D4: Rockville W8K9D4 K9 Series 8 inch Dual4-Ohm Car Subwoofer Peak Power Handling: 2000 Watts Program Power Handling: 1000 Watts CEA Rated RMS Power Handling: 500 Watts 2.5 inch 4-Layer ASV Voice Coils Wound with OFC Wire Made in USA This voice coil is stable up to 200 degrees celcius! The voice coil windings are made in the USA! Double Stacked 122 Oz High Quality Magnet Cast Aluminum Basket With Black Sanded Finish Makes This Sub Very Efficient And Lighter Weight Two Chrome-Plated Binding Post Terminals Black Non-Pressed Paper Cone With Beautiful Finish Our cones are ultra-stiff. They are thicker and stronger than other subs on the market making our subs able to handle more power. Specification of REC110: 2 hole 8 inch Ported for GMC/Chevy 2007-Current Crew Cab Underseat Front fire Finished with Durable Bed Liner 2007-Current GMC/Chevy Crew Cab Air Space:0.8 Cubic Feet per sub Mounting Depth: 11.25 inch Tuning Frequency: 35HZ 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 Features: Rockville KRYPTON M3 4000 Watt Peak and 1000w RMS Class D 1 Ohm Stable MonoAmplifier With Voltage Display Dyno Certified RMS Power Ratings: Certified Dyno Test / Less than 1 % THD Usethese ratings when comparing with top brands such as Kicker Rockford Fosgateetc 1 Ohm: 1000 Watts x 1 Channel <1% THD+N 71% efficient 2 Ohm: 700 Watts x 1 Channel <1% THD+N 79% efficient 4 Ohm: 400 Watts x 1 Channel <1% THD+N 84.5% efficient Peak: Use these ratings when comparing with the top budget brands such as BossPower Acoustik etc 1 Ohm:4000 Watts x 1 Channel 2 Ohm:2800 Watts x 1 Channel 4 Ohm:1600 Watts x 1 Channel Digital Voltage Display on Amp Accurate within 0.15V Power/Protect/Clip LED Indicators on the front panel Video of RWK41: Features: 1 17 High Grade Twisted Pair of 100% Copper RCA Cable 17 4 Gauge Translucent Blue SuperFlex Power Cables 17 18 Gauge Blue Remote Cable 17 16 Gauge Clear Speaker Wire 3 4 Gauge Clear SuperFlex Ground Wire Gold Plated AGU Heat Resistant Fuse Holder 60 Amp AGU Gold Plated Fuse 7 Split Tube Loom