Pioneer TS-WX140DA 8" Space-Saving Amplified Compact Active Subwoofer wireless speakers What is the difference between

What is the difference between the M1D2-12 and the M1D4-12

50" (89mm) ✓ Voice Coil Diameter 2

Vehicle Compatibility: Ford Falcon AU Series 1/2/3 (1998 - 2002)

Overload Shutdown: 2200W

Pioneer TS-WX140DA 8" Space-Saving Amplified Compact Active Subwoofer wireless speakers What is the difference betweenPioneer 8" Space Saving Amplified Compact Active Subwoofer: Space Saving Active Subwoofer With Built In Class D Amplifier! TS WX140DA Compact Active Subwoofer The New Pioneer TS WX140DA is extremely compact, measuring only 280mm wide x 200mm deep with a height of only 70mm. Its designed to be installed in various small, tight spaces where conventional subwoofers cannot fit. With the ability to fit under seats, behind seats or inside small storage