crossover setting is really room/speaker dependent, there is no right or wrong answer. When in doubt, 80Hz is a great starting point as that's the THX recommendation. Basically, the only answer is to try it and see which sounds better. I probably wouldn't go higher than 80 with big speakers like the RC-70 + RC-LCR.
Your 6190 should have an auto-calibration program -- an auto-calibration like Audyssey (not on the Yamaha) can analyze room acoustics and recommend an optical crossover position. Maybe run your auto-setup and see what YPAO tells you.
Your 6190 should have an auto-calibration program -- an auto-calibration like Audyssey (not on the Yamaha) can analyze room acoustics and recommend an optical crossover position. Maybe run your auto-setup and see what YPAO tells you.































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