Originally Posted by Qliver
I own an Epson Home Cinema 3700 (EH TW6700), it comes with a 3.5 mm mini stereo jack output. However, my Logitech Z-5500 speakers are 5.1, meaning they come with 3 x 3.5 mm connectors. The projector will be hooked up to my PC through HDMI. The PC has a sound card where I can connect the 5.1 speakers through Toslink. However, my girlfriend also wants to watch series from her laptop, while I'm playing on my PC (while using my headset). The picture is no problem per se, since the projector comes with two HDMI ports. But I don't know what I can do about the sound? I don't understand the point of having a 3.5 mm stereo jack in the first place! Don't most home cinemas use 5.1 sound systems? Would appreciate some input and ideas!
With a projector, the norm is to use a HDMI cable from a AVR to the projector for the picture, and the AVR take care of the sound.
The mini stereo jack is mainly use for using the projector in a school, conference and so on, and only from one source (HDMI), only providing sound in stereo for be able to listen to it, not for theater viewing.
There are two HDMI input on the 3700, therefore it could come from two different source, but only one at the time.
In short, I do not have a solution to what you are trying to achieve, other than using the HDMI output from your PC to projector for the picture and get a stereo source to? from the jack output from the projector.
I will see if I can find a better place for you for this thread, if I find something, I will edit and post a link.
This link is about computer and stuff, you may find better help there;