MB Quart PSAP-3S Dash mounted plug for GMR-7 w/ USB, USB-C and 3.5mm SHIPLTL The AT-603AP features push-in terminal

The AT-603AP features push-in terminal block for easy connection

180-degree horizontal

you can also plug in a guitar and use the speaker as an amp

No wonder that in his Hi-Fi+ review of the M6s range

MB Quart PSAP-3S Dash mounted plug for GMR-7 w/ USB, USB-C and 3.5mm SHIPLTL The AT-603AP features push-in terminalTriple input adapter for source units that allow easy to access to the USB and auxiliary rear inputs. Compatible Vehicle Fitment Universal Compatible Product Models MB Quart and Universal Source Units. Marine Grade Protection IPX Rating Built in rubber seal and front cover protect connections from the elements. Installation Universal installation for standard carling style switch knock outs. Other Features WIRE CABLE TYPE: 3. 5mm mini jack to RCA