Can I "double-wire" speakers?

Hi Simao,
Just because you "can", doesn't meant that you "should".
The Titus has a very high frequency crossover, and is also very easy to drive, so IMO bi-amping would be wasting most of what you can gain from the Sophia's presence to give you an incredible mid-range.

Alternately use your second set of speaker wires to set up a line-level feed to active sub with crossover of 55-60 Hz.

Or, bi-WIRING (not bi-amping!) is good to try, where you run two sets of speaker wires from the Sophia output terminals, with one set going to the high-freq posts and the second set connecting with the low-freq posts (jumpers removed).

If single-wired to speakers, try replacing the stock jumpers with connectors similar in grade to your speaker wire.

Good luck with your Sophia, and please let us know how it all comes together.

It occurred to me not for the first time that much of my concern stems from the seduction of bass. The Tituses by themselves are wonderful, transparent speakers worthy of all the praise they received. Yet I set them up alongside the Velodyne in order to emulate the frequency response my (now long-gone) set of Maggie 3.6R's and now it's going to be tough to extract myself from the magic of the bottom end.

I think Stereophile a few years back had an interesting article on how bass, though adding the added frequencies, can cloak music and muffle the mids. It went on to say that pop culture is so attuned to bass and vibration that we think we need it for the music to sound good.

Bass is an integral part of music, that's why we think we need it.

I have biamped with unlike amps and with several different combinations. I did by chance hit one combo that sounded quite good with a slightly more powerful amp on the bass end. Too much power on the low end is---too much power on the low end--not sucessful. If you have the amps and have the cable, it's just fun to try it.

"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?"

How is the crossover point messed up with passive biamping?

Simao: As long as you're careful, there's no reason you shouldn't play. It's fun to experiment. You have adjustable gain (re: Unsound's objection) anyway. You'll probably learn a lot in the process. However, I do agree with Sandstone that your mids will likely miss the Sophia. Maybe just incorporate the Velodyne with your Sophia and Triangles, and remove the Onkyo?