YAMAHA HS7 Active monitor Woofer LF Driver 16cm 60W 4 ohm - Pro Audio Service Ltd
COPPIA Mid Woofer 16 cm BASS FACE 4Ω SPL6M.4.4 Medio bassi fronte urlo spl audio
Amazon.com: Pyle 6.5 Inch Mid Bass Woofer Sound Speaker System - Pro Loud Range Audio 300 Watt Peak Power w/ 4 Ohm Impedance and 60-20KHz Frequency Response for Car Component Stereo PLG64 : Electronics
Coppia Faital PRO 6FE200 Woofer 16,5 cm 6" 130 W RMS 95dB 4Ohm