I am trying to connect my 2008 MacBook Pro to my Harmon/Kardon AVR254 Receiver. Currently, I have been using the headphone jack on my laptop connected to an RCA cable adapter and then connecting the two RCA cables into my receiver. The problem however is that when I connect a subwoofer to my receiver, I get only a drone on the subwoofer and no bass channel from my laptop passed through it. I was thinking this was because the headphone jack only transmits the stereo channels and not the bass. Is this correct? and if so, what is the best way to get the full sound out of my laptop? (I should also note that my macbook pro model is the model that does not have an internal HDMI out setting, so connecting via hdmi straight from the laptop does not seem possible).
Macbook Pro 2008