That's about the minimum I would go with a set of mains rated flat to 40. The other thing to consider is where the mains are in the room and the flexibility of placemen of the sub. Crossing them over a little higher might help some with room interaction if you have the freedom.
Personally, I run mine at 50 for music and 60 for HT. My mains are rated down to 28. I like to keep close to an octave above and use steep xover slopes but that's just me.
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