Can I "double-wire" speakers?

I doubt that both amplication sources will have the same gain.

Gotcha. I'll remove the jumpers between the two sets of binding posts and see what happens. I haven't received the Sophia yet, but I suspect I won't get the same bass response as I do from the Onkyo with its Velodyne sub.

Then again, this might all be a moot point if the Sophia performs as well as advertised.

Thank you for all your advice.

If you are trying to use the two amps as two seperate systems driving the same speakers,no. The top connections are connected to the mid/high x-over and the lower ones to the low x-over.

I agree with Unsound. Not only is it unlikely both amplifiers would have the same gain, but they will also have different characters and this will occur at the crossover point. Speaker manufacturers make every effort to develop a seamless crossover. Why mess it up? So, if you have an Onkyo receiver and a Sophia Electric the answer is no. If you have two identical amplifiers the answer is yes.

The answer is likely no but that isnt known till you try it as far as gain goes.