Ya know Ani i have the previous onkyo model tx-sr 600 and i find the same thing. even turning up the db on the center helps but still sometimes the loud explosions will still be way over the top. I dont have axiom speakers (yet) just some sony towers and denon center and surrounds. I also should mention im still very new to this but im leaning towards just a annoying nuance of the onkyo reciver. hope this helps but probably not lol

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Leave the gun, Take the canolis.