Interestingly new type of subwoofers, PowerSoft-Audio M-Series Pro Subwoofer | Audioholics Home Theater Forums
Powersoft's Revolutionary IpalMod Adopted by Eighteen Sound — TPi
B&C 18IPAL 18-Inch 3400W Power Soft Sub Woofer 753807515016 | eBay
Powersoft M-Force FLH or Tapped horn - Bass Gear | Diy subwoofer, Pro audio speakers, Subwoofer box design
M-Force Sub - Powersoft
MAG Audio Introduces THOR Cinema Subwoofer Based on Powersoft M-Force | audioXpress
AudioFocus - AudioFocus TS40 infra sub powered by Powersoft M-Force moving magnet linear motor structure! Peak SPL at 1m : 150 dB Frequency range (-10dB) : 20 Hz - 80 Hz Official
B And C 18IPAL B&c 18" 3400w Powersoft Woofer - Walmart.com
M-Force Sub - Powersoft
Powersoft Introduces New M-Force Design at 2018 Prolight+Sound | audioXpress
B And C 21IPAL B&c 21" 5000w Powersoft Woofer - Walmart.com