@yogiboy wrote: "Many people that use a sub run the speakers full range without the high pass option!"
I'm one of those people.
I remember trying to find a sufficiently transparent highpass filter for my tweaked-out Quad 63’s, which sat atop matching Gradient dipole subs. In the end the best results (to my ears) came from running the 63’s full-range and accepting that the max SPL was limited.
Now that I manufacture a subwoofer system, I’m aware that the parts cost in the highpass filter section of my subwoofer amp is not very high. I wouldn’t want it in my main speakers’ signal path if I could help it.
So when I design a speaker specifically to be used with subs, I make sure it has enough thermal & mechanical power handling and enough efficiency that the user has the option of foregoing a protective highpass filter with very little likelihood of significantly compromising headroom.
Duke