It is not uncommon for keyboard players to start with home Hi-Fi system for their keyboard amplification needs although over time most keyboard players will use keyboard amps, near field monitors or PA systems. The main reason is that the dynamic range of keyboard sounds easily exceeds the dynamic range of home Hi-Fi systems and if the volume of Hi-Fi system is set high your keyboard may blow out your Hi-Fi amp or speakers. Usually the output signal levels of pro keyboards are much hotter than home Hi-Fi equipment, so if you pay attention to your Hi-Fi system volume setting so as not to overload it, you should still be able to enjoy your 9000 Pro at home with your existing Hi-Fi equipment. Keyboard amps or PA systems sound different though since they are designed to work with instrument amplification, they are much louder, clearer, and able to handle much wider dynamic range of music (but not as delicate sounding as home Hi-Fi usually). Since recorded materials like CDs, DVDs have been processed (compressed/limited) to fit into the dynamic range that home Hi-Fi system can handle, they usually sound great. If you do not have compressor/limiter, you will have to take extra care not to overload your Hi-Fi equipment. Otherwise, there is no reason why you cannot enjoy your own music through your Hi-Fi system for now. When you save enough money to buy proper instrument amplification, I recommend you get separate keyboard amps/PA system setup for proper match of equipment in long run.

Paul Ip
from Texas