Spring-loaded Speaker Connection

[EsteroRAT]

My stereo speakers have a spring-loaded connector and my output device is RCA.  I'm familiar with the pinout of the RCA, but I am not sure which connector on the speaker is ground and which is signal.  I would appreciate anyones expertise in enlightening me.
Roger

[ginbot86]

Try experimenting with the polarity. Just remember to keep the volume low so you don't fry anything.