To setup a Bi-amp solution, as easy as 123 & affordable !!!
Just simply configure your existing Trends TA-10 Class-T Stereo Audio as a pure power amp (no volume control function) by resetting the jumpers in J2(Refer to user manual). The input impedance of the Trends TA-10 amplifier is about 50k ohm.
It is easier to bi-amp your speakers with two Trends TA-10 amplifier, connecting one of these to the highs binding posts and the other to the bass ones.
You can alternatively bi-amp your speakers using one TA-10 per speaker. Of course each TA 10 should be fed by a single channel only! (One TA 10 connected to the right channel, the other to the left one). In any case, you need a signal splitter, some kind of Y or T adapter (2 pairs of RCA's outputs) to double the signal that feeds the TA 10's (few $).
For example:
Trends PA-10.1D SE Tube Headphone/Pre Amplifier x 1
US$299
TA-10.2 SE Class-T Stereo Audio Amplifier(with 4A Power Adaptor) x 2