First, sorry if this is a question with a simple answer for those with more experience.

We recently purchased a 40PFL3706/F7 which only has a digital audio out. We only have analog speakers (they're just nice computer speakers we had hooked up to our previous tv with 3.5mm to RCA stereo cable. Having dropped the money for the TV, we don't have the money to buy a receiver to act as a middle man between the TV and speakers. Before I found this forum I purchased a $20 digital to analog converter on Amazon so we could use our external I'd hoped. Had I poked around on the support forum first, I would have known better as the bulk of converters I've seen do not support Dolby Digital signals.

Here's my question: in order to go from the coaxial digital out on the TV to our analog (red/white) speaker connection, do I simply need to get a digital to analog converter that says it supports Dolby Digital, like this, or are there other pieces of the puzzle I'll need as well?