I’ve recently gotten myself a (cheap) turntable. It has speakers built-in, but they aren’t great quality so i want to connect the turntable to external speakers and a subwoofer.

I kind off succesfully did this, however i can’t turn up the volume of the speakers. The turntable itself has a volume controller but it only works for the internal speakers, not the external ones.

My external speakers (logitech Z533) are directly plugged into the turntable (Lenco LS-50WD) via RCA, but they come with a subwoofer. The subwoofer isn’t connected. The subwoofer has a volume control connected but the speakers don’t. So i think i have to connect the speakers to the subwoofer to be able to control the volume, but i can’t because there is no connection for the subwoofer and the turntable (the subwoofer has a 3.5mm jack).

My question is, do i fix my problem with an adapter (rca to female jack) or do i need to buy something else?

Thanks in advance!