TDA7297B Digital Amplifier 15W+15W Dual Channel Audio Control Module+3 inch 4Ohm15W Full Range Audio Speaker+DC12V Power adapter|adapter ford|speakers worldspeaker stand adapter - AliExpress
4X Harmony HA-P12LS16 Replacement 12" Pro PA 800W Subwoofer - Speaker 16 Ohm Sub : Musical Instruments - Amazon.com
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2 PHONOCAR SELECTION 02086 altoparlanti woofer 16,50 cm 165 mm 6,5" di diametro 70 watt rms 180 watt max impedenza 4 ohm 92 db spl auto nero, a coppia : Amazon.it: Elettronica