A:AnswerThere is an F connector for FM. There are spring loaded push connectors for AM.
https://usa.yamaha.com/files/download/other_assets/1/1161601/web_AV17-0087_RX-V385_om_UCABGLFP_En_A0.pdf
page 24
A:AnswerThe feet may be removable, seems like there is a screw counter set via a narrow screw hole. Not sure what tool would be appropriate. The feet also seem to twist a little, so they are not a fixed permanently- so seems like you may have success removing them. However, personally I would not. Here’s why- stereo components require lots of air flow to cool while in use. In very high end systems, they put the electrical equipment in chilled rooms. Heat shortens the life of the stereo equipment . The feet help with air flow and keeping heat moving away from the unit. Hope this helps.
A:AnswerI have the Polk Audio PSW10 10-Inch Powered Subwoofer which cost $89.99. It puts out more than enough power (50 watts.Amplifier Dynamic Power - 100 watts) for a medium sized room.
A:AnswerThe system is 5.1 the .1 is for the subwoofer usually it’s two rear, two front and a center speaker that account for the 5 speakers system if the additional speaker your referring to is the subwoofer it will work just fine
