I just bought the Logitech Z506 5.1 speaker system, and I can't get it to play through all 5 speakers. I use my laptop, which has 2 audio jacks (there's a microphone jack too, I didn't try to plug it in there), so I can only plug in 2 of the 3 cables.
The speakers are supposed (I think) to have some kind of forced surround sound output so that stereo input is played in surround, but if I only plug in the front speakers, all that plays are the left and right speakers and the sub. If I plug in 2 of the cables, those two things will play, but not the third.
I tried using a splitter, with one cable plugged in directly and the other two sharing the splitter, but that seems to overpower the speakers that aren't using the splitter.
After about a day of this, I ordered the GWC Technology AA1500 USB Audio Adapter (5.1 Channel), which is supposed to convert sound to 5.1, and it does have the 3 jacks for a 5.1 system, but when I plugged it in, installed the drivers, and tried to use it, it only played sound through the Front port. I tried going to (in Windows 7) Control Panel -> Sound -> Speakers -> Configure and setting playback to 5.1 Surround instead of Stereo, but the problem remains. The output is still only through the front jack.
Before these speakers I used a cheaper 5.1 system, the CA 5402, and even with only 2 cables plugged in, those speakers all played. I really don't understand why the Z506 won't just port sound from the front left and right to the rear like my old ones did. I tried plugging the satellites from the Z506 into the sub from the CA 5402 with only the front and center/sub cables plugged in and I got equal sound from every speaker, just like I wanted. Any ideas on why I can't get this from the Z506?