Originally Posted by NetGod
Regarding the SR5013:
Will the SR5013 will have full 7.1 pre-amp outputs for connection to an external amplifier?
Specifically, using an external amplifier, can I power a 5.1 setup with my mains bi-amped?
Yes, although bi-amping in this way provides no audible advantage. It's just a marketing ploy.
Can the same be done with the SR5012?
Or should I be looking at the SR6012, SR6013, SR7012, and SR7012?
They all provide the same "bi-amp" feature.
Unfortunately, however, bi-amping speakers using a receiver does nothing useful. It's just a marketing ploy. The total power available is limited by the receiver's shared power supply and biamping does not double the power available to the speaker (the woofer requires most of the power, tweeter and midrange drivers use very little). Also, the audio quality is not improved because the same audio signal is provided to both of the receiver's outputs, and the same passive frequency crossover networks are used for the drivers in the speakers whether or not the speakerss jumpers are in place.
If you really need more power, you should use an external amplifier (as you mention). However, remember that 2x the power provides only a 3dB increase in sound level, which is just barely noticeable, while 10x is needed to double the perceived sound level. The best way to get a higher sound level is to acquire speakers with an efficiency (sensitivity) greater than 100dB/w/m. Most are below 90dB/w/m.