Hi... I have a basic IBM Thinkpad (2008, model T61). Out of the headphone jacks, I run a splitter and have sound through 2 sets of IBM Infinity speakers (4 speakers in all). I recently received a Boston Acoustics BA-735 speaker setup, but I can't get it to work through my PC. From reading on-line, I believe these BA speakers are digital, whereas the Infinity speakers likely are analog (or, possibly the other way around). I can't upgrade or modify the PC itself (owned by my employer), so new soundcards, etc is not an option..... My question: how can I get the BA speaker setup to work with the existing speakers I have in place... are there converters, etc that I can get from an electronics store, that can make them all compatable, and continue to drive sound using the headphone jack? My understanding is the BA speakers have great sound, so I"m hoping I can somehow add them to the setup..... thanks.