No way to connect the turntable directly. Why don't you try to do it with the transmitter? It would be easy. By the way, great choice of the speaker, but if I were you I'd still go with portable Marshalls.
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Here is a simple Bluetooth transmitter,
however, you cannot connect the turntable to this directly. You still need the phono preamp.
Turntable > Phono Preamp > Transmitter
You need a phono preamp between your TT and your all in one Marshall speaker system. Because a phono stage is the one thing your Marshall doesn't have. Phono preamps start at around 50 bucks up to 5 figures.
Connect the two RCA leads and ground wire from your TT into the phono preamp inputs and ground terminal. Then run a pair of RCA leads from the preamp into the analog inputs of your Marshall. That simple.