Which model Optiplex do you have? Generally there is a line out (green) jack on the back of the system for external speakers, headphones, etc. But audio cards are still in use and a sample of them can be found here.

Hi

Thanks for reply it is the 5000, looked but no audio jack rear. Will look at basic cards thanks. Hoped a usb to speakers would work but thats a no no

Great to hear from you

cheers

Doug

You r correct Dell got rid of rear audio port in 5000.  It was available in 5090.

5000

5090