In that case, shouldn't the M80s (or other towers) have high pass filters below their -3dB point to avoid damaging the drivers?

Also, the OP has a sub and chooses to redirect the LFE to main + sub, in that I understand, the M80s are asked to play 20Hz and they can't. However, in may case, I have no sub so the .1 should not be played. I thought only the LFE channel would go that low, not the Front channels. Am I misunderstanding something?

Bruno
M80s/VP180/QS8s/EP600/AVR-890
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"The problem is choice..."