Originally Posted by AlphaCentaurus
So just to be sure...
1- use 8-ohm speakers for all 9 speakers
2-I put my amp on 4-ohm
3-I plug the surround speaker pairs in parallel (I don't know the best way...swist them together ?)
4- I calibrate each channel to have same DB at sweet spot
is that it ?
thanks a lot for your help...your experience is of great value
I hope these aren't all confusing responses to your question. I have to offer two bits of my advice:
1. Go bigger on the screen. You will regret not getting a bigger size once you have it. If you are worried about being too big don't. If it is within the dimensions of the standard equations then go as big as possible. (I look at the 45 degree angle sweet spot most of all)
2. Regarding ohms. I think you need to decide what specific equipment you are interested in before anyone can intelligently answer your questions about what impedance to feed each speaker. The good news is that what you want to do is completely doable, and you won't have to do much more than what the receiver will likely already support. But in order for us to intelligently answer your question, it will depend on the specific equipment involved.
Now I will go into the weeds for a moment:
Regarding impedance; speakers come in different impedances. It does not necessarily mean a speaker is better or worse than another, but as a general guideline, the lower impedance, the more efficient and clean sounding a speaker of home theater size will be, and also will need appropriate wattage to drive it. Regardless, the configuration of individual speakers will vary depending on the specific AVR and/or amplifiers in-use. Many mid-level audio receivers DO output 4 ohms, so it's not out of the question. AND it is also possible that some of your speakers will be rated to 4 ohms and others to 8 ohms. So you might end up with a mix of impedances you are dealing with. Some receivers can also handle this issue.
I hope this helps.