is it important on a HT spkr set, that all spkr has the same impedence ??? if not, can it damaged the receiver ???

actually my front spkr (JBL LX55) as 8 ohms
VP100 has 8ohms , VP150 has 6ohms
QS4 8ohms , QS8 6ohms.

Should i not considere purchase VP150 & QS8 just because they aren't 8 Ohms ?
Tech data of my receiver (Cambridge Audio Azur 640r) says that it can use any spkr impedance from 4 thu 8 ohms, but donesn't says if all channels must be the same or not.

Having 6 & 8 ohms impedance on a HT spkr set, can it affect the quality on the sound ???

Nope. As long as the amp can drive the lower impedance, there's no concern with making sure they're all rated the same.

I would be more concerned with matching the center with your mains. Either go all Axiom or all JBL. Mixing the two may create timbre issue (like voices changing as they pan from left to right).

Yeah... good point Dave. I didn't even catch the the fronts would be a different brand...