A:AnswerThe unit does not have speakers built in. It does come with Bluetooth. So any BT speak will sync to it. It also has connections for a pair of speakers on the back.
You do not have to buy speakers. However if you want a better overall sound I would invest in some speakers.
A:AnswerIn the back of the unit near the plug is a standby button, which essentially is the power button, it needs to be pressed in. This button will always stay pressed on or down. So when it is not being used it will go into standby mode. The turntable will always be on.
A:AnswerNot sure but I googled the model and the cartridge and it shows replacements for sale. So sounds like it is. Further google research should give the for sure answer you’re looking for.