I just received Z906 yesterday replacing my faithful 15 years old Altec Lansing ADA890. The ADA890 is 4.1.
I must say that the old ADA890 sounds better than Z906.
There are 3 big disadvantages about z906:-
1) No tweeter, the overall sound emphasize more on bass or boomy. Treble is horrible without tweeter. Listening to music? Forget it, z906 does not qualify.
2) Over aggressive subwoofer. The bass is aggressive, which means the subwoofer respond more on slightly higher frequency above 80Hz, which make the overall sound boomy but over time ears will get tired for those unnecessary boosted bass. The subwoofer can't play well at deep bass ( very low frequency bass)
3) No fuse protection for subwoofer/control board. ADA890 has it at convenience, and i had replaced them 2~3 times. I donno how long my z906 can last.
4) No LCD display for that price, using poorly built control panel. I have friend complaint the power button has broken after 1 year of use.
I would say z906 aims for movie and gaming, and for those who likes boomy sound. The Satellite is about 760g each.
I don't like z906 a bit. I am replacing all the satellite speakers with the cheap Audio Pro SB-1 speakers which will arrive in next 3 days, and i believe the sound will be better. I can't do much about the stupid subwoofer anyway unless i replace the whole system. Why not just use home theater system you ask? Because of the lioness at home... the AVR is too obvious and unable to hide from her. One thing i dislike about AVR is it takes 1~2 seconds to detect the source to respond whenever sound format change, and also from pause to continue.
The price of speakers for PC is always overprice if we compare same price vs quality with home theater system.
Yamaha is a very clear winner in this case. It has also advantage of decoding DTS MA and DD True HD (should be)