Arduino / Speakjet

thanks for the obvious links, i appreciate the help. i've got everything cued in...no error messages (any more!), but still not getting any sound.

Q - should this work just by connecting two audio outs to a quarter inch jack and then an external amplifier (eg, my PA system), or do I absolutely NEED and amplifier?

headed to pick up an amp tomorrow, but if i'm wrong on this it'd be great to know before spending any money...

thanks . . .