for example thumb style active vs passive speakers car audio preferable collar Sociable
Edge Sw10p Car Audio 10 Inch Active Subwoofer with Passive Radiator, Built-in 600W Amplifier, Include Remote Subwoofer Control and 8AWG Complete Wiring Kits - China Subwoofer and Active Subwoofer price
Passive and Active Speakers - 13th Note HiFi Reviews
Active vs Passive Speakers: Advance or Stay Classy - IPS Inter Press Service Business