Speakers not working

I have four speakers and one connected to my monitor as well as a subwoofer. I noticed that only my two left speakers are working. I go into my aound blaster settings and run a diagnostics test, everything is fine. I run a speaker test and noise comes out of every speaker, so i know that it isnt a hardware problem. I’ve tried everything, messing with control panel and my sound blaster settings. Any ideas?