How to wire two DVC subs to a mono block?

When you're using DVC subs, you have to decide what the wiring of the voice coils of EACH sub will be, and then how to wire the subs together.  How you decide to do it will depend on the ohm rating of the subs' voice coils...and the amplifier output rating.  You want to have as high an impedance as possible but still get the amount of output you desire from the amplifier.  Here are some scenarios, as I am not going to go to the audiobahn website to look up those sub specs:

In the above depictions, the DVC subs are rated as 4 ohm DVC.  You can use either of the above wiring configurations depending on the output you want from the amp.  In the top pic, the subs are wired to create a 1 ohm load on the amp...you would use just one set of the output terminals.  With this method of wiring, you are forcing the amplifier to perform at it's maximum output, which means it will run hot, produce maximum power output (...and you have to be sure it is rated to run at 1 ohm...), and the sound quality will be minimal.

In the second pic, the subs are wired to a 4 ohm load on the amp.  Sound quality goes up and power output goes down.  In the two pics below, you'll see what possiblities there are if the subs are 2 ohm DVC (and you are still using just one set of the amp's output terminals):

The same rationale applies with these;  the 2 ohm wiring will get more output from the amplifier than the 8 ohm wiring, but the latter will yield the greater sound quality.

It's rare that a person concerned with the highest sound quality would be using two subs and the brand Audiobahn and Alphasonik.  So I would assume you are looking for maximum output....so use either of the lowest ohm load wiring configurations depending on the rating of your subs and the lowest ohm rating of the amplifier.