BIC Acoustech PL-300 Subwoofer Review: Legit 20Hz Extension for Under $500?!? | Audioholics
Electro-Voice ELX200-18SP 18 inch Powered Subwoofer Reviews | Sweetwater
Two GoldenEar Subwoofers | REVIEW - Part-Time Audiophile
Amazon.com: klipsch Reference R-121SW 12” Front-Firing Subwoofer with revamped Spun-Copper thermoformed crystalline Polymer woofers and an All-Digital Amplifier for Premium Sound in Black : Electronics
Subwoofer Reviews | Stereophile.com
Amazon.com: Hifonics HFX12D4-PAIR 400-Watt 12-Inch HF Series Dual 4-OHM Subwoofer, Set of 2 : Electronics