can I use this with my stereo system using rca cable

not sure why you would want to but yes, but you need an 1/4 inch plug to rca adapter. they are really cheap. you can do either mono or stereo. hope this helps. are you using the stereo as an amp?

What is a proper way to connect from an balanced output of FX2000 to a mixer with unbalanced input?

Good question, I recommended that you can connect your FX2000 on your mixer output send in mono left from your mixer input on left fx and connect from your fx2000 output left and right return input on your mixer neither your want use balance or unbalanced. Try to connect on that ways is the best for you. It's will mix up the sound when the signal return back into the mixer.

Item model number	FX2000
Is Discontinued By Manufacturer	No
Color Name	Silver, Black
Hardware Interface	USB
Signal Format	Digital
Supported Software	Ableton Live
Instrument Key	Any
Hardware Platform	pc
Voltage	5 Volts

Behringer マルチエフェクトプロセッサー 高性能アルゴリズム 70以上のエフェクト搭載 100ファクトリープリセット/100ユーザープリセット MIDI対応 FX2000

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Behringer マルチエフェクトプロセッサー高性能アルゴリズム 70以上のエフェクト搭載 100ファクトリープリセット/100ユーザープリセット MIDI対応 FX2000