Computer Preamp Can A Phono Turntable Use Computer Power-speakers Without A Preamp?

Can a phono turntable use computer power-speakers without a preamp? - computer preamp

Turntable RCA has two blades. If I have a 3.5-mm Y-adapter cable (2 RCA to mini stereo plug), you use the power of your speakers enough volume without the need for a preamplifier?