That will be fine. Each side of the Y connector will realize a 3 dB drop in output, but you should be able to easily adjust for that with your level controls.
Yes, you can use a "Y" adapter on this output. There will be no drop in output, as the preamp acts as a voltage source. The split signals are in parallel, and as such remain the same voltage since the current is quite low as a result of the rather large impedance mismatch between the preamp output (typically 100 ohms) and a power amps input (typically 10K to 50K). This type of interface is known as a voltage bridge and may be successfully split many times before any degradation is realized.so can I use the left and right pre-outs and place a "Y" connector on each,so I have two outs from each, (left and right) or will I create a problem for my integrated?