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power amp help

You can use your balanced XLR output or your effects send to connect to a power amp. I don't see a preamp output on your amp. When you do this you can use the power from your amp and the power amp in parallel (driving different speakers) but you cannot bridge or sum the power into one cab. As mentioned above DO NOT use the speaker outputs into a power amp or you will fry something!
 
EFFECTS SEND
This jack's primary function is to send a post-EQ-and-SubWave™ signal to an external effects device for use in the 550x
Effects Loop. However, it can also be used as:
1. A line level output for use in conjunction with an additional (slave) power amp–such as SWR's
Power 750.
2. An unbalanced output suitable for recording or live mixing board purposes.
The output impedance of the Effects Send jack is 100 Ohms.