Use Bose powered computer speakers with iMac headphone jack

There may be another method to connect via a USB audio adapter, however

some of these third-party peripherals work different, between various brands.

• About the external features and ports on your iMac and iMac Pro - Apple Support

Your iMac may look differently on back; settings should be similar in OS.

Did you look to the Audio system preference (sound) to see if other output

choices exist there? Or maybe in another system preference. I don't use

speakers with my newest Mac; and only powered ones on vintage G4 Mac.

A standard headphone jack should be OK; you may want to see if the output

for that can be set to another level. ~ And the iMac may support newer audio

technologies via what appears to be a headphone jack. The audio port in my

Late 2012 Mac mini i7 quad-server offers options.~ I don't use them, on mute.

While I have several options in the same room here, including radio, cable, etc.

{..I've requested relocation of this thread to appropriate 'iMac ASC' section..}