Powered subwoofers running into power amp?

The signal from the bass subs is not amplified. It is just passed from input to output by straight wire. It can be sent to power amps directly.

The only issue is loading of your mixer output with the additional input impedances (resistive and capacitive loading) of both the bass subs and the power amp, plus the capacitance loading of the interconnects. The bass sub input impedance and the power amp input impedance will appear in parallel with the ouput of the mixer.

So, for example, if the power amp input is 50K, 100pf and the bass subs are 50K each, 100 pF, then the mixer output will see 16.7K and 300 pF. If it can drive this load, then no problem.

Wolfman

The OP didn't say he was a pro using balanced line 600 ohm outputs, amigo.

If he was, I doubt if he would have asked this question.