Review on 🔌 NANYI 3.5mm Male Stereo TRS to Two 6.35mm TS Female Stereo Breakout Cable - 1FT Y Splitter Adapter by Mike Mitchell

This works as intended if you want the same stereo output from both 1/4 jacks. I mistakenly thought that this connector would split the stereo signal into left and right channels to feed two left and right speakers. Therefore, both speaker channels sum the stereo signal to reproduce monophonic sounds. Buy a suitable splitter if you don't want to repeat my mistake.