Pre-outs on a reciever.

A receiver has 7 channels of built in amplification and it has an additional 7 outputs to use external amps. If all 7 internal amps are connected to speakers, can you connect additional speakers to external amps via the pre-outs simultaneously?
your suppose to use one or the other ,i have used seperate amps for ht and amp in recriver for second zone
You can although you would face balancing issues since you cannot adjust the preamp outputs separate from the speaker outputs.