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Lets start with the Budget, Room size and Source. Like would it be just TV, or Bluray, PC what not.
You are right about the ohms thing. 6 or 8 ohms is what you want to look for. also sensitivity in speakers is important. Over 89db sensitivity will become very loud.
You can look at these websites for approx pricing.
ok so what will be best sensitivity? Anything less then 89db?
He do not want the speaker to produce crappy sound due to high volume. You know that burst sound.
Budget approx 30-40k? Is that sufficient?
Room size: approx 12x12 (we all have small rooms here )
It will be used with PC
Consider 2 pairs of these speakers (Taga Harmony TAV-806S) for fronts & surrounds - https://www.hifimart.com/taga-harmony-tav-806s-surround-speaker.html?search=Taga&description=true
Center (Taga Harmony 806C) - https://www.hifimart.com/index.php?route=journal2/quickview&pid=852
Subwoofer - https://www.hifimart.com/taga-harmony-tsw-90-v-3-active-subwoofer.html?search=Taga&description=true
If you have any more budget left and would like to complete 7.1 set-up, then consider one more pair of Taga Harmony TAV-806S..
Getting Yamaha RXV 681 and spending 30-40k on 5.1 system is being unfair to the receiver. Its potential will never be realized by satellites. Given the small room I would go for 481 and spend more on speakers.
If he is determined on 7.1 or dolby atmos future proofing, then go for 581, it will be more than sufficient.
For speakers, I would go for step-wise approach, something on the lines of elangoas. First start with front speakers and then build slowly. Many other options available, check prices on Hifi mart and Htstore to have some idea.