Sorry! So yes, I can connect the turntable directly to the speakers and the sound is clear, if maybe a little quieter than I can get them if I'm connected to Bluetooth; is that expected? I always thought I needed a pre-amp + receiver to get from the turntable to the powered speakers.
In the image I have the Right Speaker connected from the top jacks (labeled Analog In/Out which I know the flash blocked, sorry!) to the Receiver Audio Input 4 OUT; and then from the bottom jacks the right speaker is connected over to the left speaker with speaker wire.