I am using a pair of 2wq subs. with my Vandersteen Treo CT speakers. With an amplifier impedance of 104kohms, you should set the crossover dip switches to 50kohms. The 2wq manual says to set your crossover one setting BELOW the actual amp impedance.
As far as the "Q" setting, I too have mine set at "1' for the tightest bass response as the 8 inch woofers in my Treo CT are very tight in their response. For the db setting I started with the efficiency of my main speakers and then adjusted slightly one way or the other by listening. I found listening to a good recording with a stand up acoustic bass to be helpful with this. I used Ron Carter CDs to help me with that.
I hope this info. is helpful. Please feel free to ask more questions you may have.
As far as the "Q" setting, I too have mine set at "1' for the tightest bass response as the 8 inch woofers in my Treo CT are very tight in their response. For the db setting I started with the efficiency of my main speakers and then adjusted slightly one way or the other by listening. I found listening to a good recording with a stand up acoustic bass to be helpful with this. I used Ron Carter CDs to help me with that.
I hope this info. is helpful. Please feel free to ask more questions you may have.