[Amazon.com] 2) NEW BOSS AR12D 12" 4800 Watt Car Audio Subwoofers Subs Woofers Dual 4-Ohm

[Amazon.com] LB1 High Performance New Wireless Bluetooth Mini Speaker for Asus 13.3" Laptop 4GB Memory 500GB Hard Drive Radiant Silver UX32A-R3502H with Built-in Microphone - Micro SD card slot - Voice Prompt (Silver)

[Amazon.com] 2) AUDIOPIPE TSAR12 12" 1500W Car Audio Subwoofers Sub Woofers TSAR12 PAIR 4-Ohm

[Amazon.com] LB1 High Performance New Wireless Bluetooth Mini Speaker for Asus 13.3" Laptop 4GB Memory 500GB Hard Drive Radiant Silver UX32A-R3502H with Built-in Microphone and Micro SD card slot (Black)

[Amazon.com] Advent and AR Factory 10" OEM Woofer, Legacy, AR2ax, Others 12100402

[Amazon.com] LifeProof Case for iPhone 4/4S- Retail Packaging - White/Grey

[Amazon.com] Boss Armor 10" 2200-watt Dual 4-ohm Voice Coil Subwoofer (ar10d) -

[Amazon.com] Johnson JA-015-AR Acoustic 15 Guitar Amplifier

[Amazon.com] LB1 High Performance New Asus 13.3" Laptop 4GB Memory 500GB Hard Drive Radiant Silver UX32A-R3502H High End Professional Audiophile Wireless Bluetooth Mini Speaker with Built-in Microphone - Micro SD card slot - Voice Prompt (Silver)

[Amazon.com] Acoustic Research AR 215PS Main 5 -1/4 2 way Bookshelf / Stereo Speaker (BLACK)

The above is "Mark Ar 4-12X40mm Adj. Obj. T2 - Ar 4 - Ar4 Woofer" recommended related products, Please click on the picture to see product details and ar4 woofer reviews!