Monitor 40 II Bookshelf

I just got a pair--pleased with them. I was intending to use a sub with them, but didn't get one yet. Hooked them up to an old school Sony stereo receiver, very basic. This amp had done fine for years running JBL L112's, plenty of bottom, no sub, no problem. They have moved on, retired them. Anyhow when I went to to EQ, I noticed a bass boost feature, which I had totally forgot about. I activated it, and it sounds terrific,with proper placement and a little added treble. The polk has (2) 5.25's plus HF.
My questions---Do I run the risk of hurting these new polks with to much LF? And even though I love the sound, am I shortchanging myself by not getting sub? And would bi-wiring yield any significant improvement?

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