Thanks Weltersys,
I have a audio magazine, bookshelf special edition. Most bookshelf had lower cutoff between 55 Hz to 70Hz. based on this, I was wondering if this would sound good.
about 40Hz, I agree to what you say. based on concept of bookshelf speakers, that don't go deep down. but produce moderate bass ( in layman's words drums could be enjoyed, although not deep enough) I was thinking of it. But if the speaker is going to sound like a small satellite speaker with no bass at all, then this design would not be worth at all.