Soundblaster X-Fi Sound Card - how to connect to an external ampli

I bought a Dimension 9200 back in May and went for the soundcard upgrade
option to "Soundblaster X-Fi Xtreme".

I recently decided that I want to output sound to my Home Theatre Amp and
thought it would be a simple case of conecting a phono lead from my PC to the
amp but alas it would seem that there is no phono output on the soundcard.

Can anyone therefore help me with either of the points below :

- in order to try and get some further info from Creative, I need to
identify exactly which "Soundblaster X-Fi Xtreme" is fitted to my PC as it
seems from Creative's website that there are several Xtreme cards. Does
anyone know which one was being used by Dell for their builds in May 2007 ?

- has anyone been able to make an audio connection to an external amp from
their X-fi Xtreme card ? If so how and with what sort of cable ?

Thanks in advance