Hi Asiatic,
Set your VP150 to Small. The VP150 is NOT a full-range speaker. In fact, most centers and surround speakers do not have useful bass output below 80 Hz.
Setting your VP150 to Large risks overdriving the woofers by routing low frequencies to drivers that are not intended to reproduce them.
There's no point in setting the centers to Large when lower frequencies are handled far more effectively by a subwoofer or the woofers in your main speakers if you don't have a subwoofer.
Don't rely on auto-setup systems to determine the Small-Large settings. With the vagaries of room standing waves and errors in frequency response readings of auto-setup mikes, you are far better off to manually set the Small/Large settings.
Regards,
