Upgrade to RTi A7

brey
brey Posts: 5
Hi all,
Just bought a Yamaha 681, and currently have 3.1 HT, TSX 110 as LR and TSX 150 as C, Polk PSW110 as sub. I am thinking to change LR to RTi A7 and later upgrade C to CSi A6. The main use is for movies in a 18sq feet room and speaker will be at 10 feet distance from where I sit. I appreciate good sound but I am not a audiophile to notice minor improvements.The main reason I want to change to a tower for LR is to have a wider range of sounds that with current TSX 110 (single woofer) I dont have. I did a demo test at a local audio store here in Argentina (done with Yamaha 2ch amplifier, dont remember the model) and I noticed the difference between TSX and RTI sound. RTI was richer and could different more sounds and frequencies.

After putting you in context, I know if I want the best sound ever I should get amplifier, the million dollar question is: 681 would do a decent enough job if I upgrade to fill the 18sq feet room? In case amplifier is a must and mandatory, a Yamaha S701 would be enough for A7?
Last question, I am currently using FosPower 100% OFC 16 gauges wire, only 4 feet distance from AVR to speaker, is necessary less gauges for this speakers? All I read online is that gauges matter only when running long distance with the wire.
Thanks a lot for reading it all.

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