Yes, I use 3,5 mm jack.How do you connect the speakers? 3.5mm stereo wire?
If so, and you are using modded drivers, disable WMP audio effects. These are quite old (like about 15 years old).
Z906, how did you connect that? Optical?
If optical, this mod will help you use DDL/DTSi to connect to the speakers; stock optical does only stereo.