Best Subwoofer Connection

@dbtom2  ... thanks, man! That's exactly what I wanted to know. I'm going to experiment ... now, at least I have a clue. Thanks, again.

Thanks to all who have commented and made suggestions. I now feel confident to proceed because of your assistance.

 The only time I found it necessary to use my subwoofers high pass filter was when my main power amp was not powerful enough to drive the main speakers. 

 Considering the many variables when adding a subwoofer system I would suggest you try both methods of connectivity as well as placement. 

Since my Primaluna integrated amp only has 1 pre-out for a sub, I run my Lawrence Violin speakers at full range. My speaker dealer suggested I set the cross-over at 45hz on my E-110. Besides the cross-over setting, it's important to set the phase on the E-110 also. I was told to invert the positive and negative connections on the main speakers so they are out of phase with the sub. Play some heavy bass music and adjust the phase on the E-110 until there is a null in the bass. Then reconnect the speakers to the correct terminals. The bass on my system became tight without any bloat.
I suggest you experiment and decide which way sounds best!    

@rlb61
You should take advantage of the xover option with the E-110 giving you a true bi-amped system. The less expensive Dominion does not give that option. That’s why the E-110 cost more because of the high quality xover is included.
If I were going to buy a sub that would be the one for me.
Enjoy it!!