Can you plug a turntable into an auxiliary input jack?

Yes, you can plug a turntable into an auxiliary input jack, but you will need a phono preamp or a turntable with a built-in preamp. Standard auxiliary input jacks expect a line-level signal, while turntables output a lower-level signal that requires amplification. If your turntable does not have a built-in preamp, using an external phono preamp will ensure proper sound quality and volume.