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.

ASIN	B003EZXMS0
Best Sellers Rank	#5,854 in Musical Instruments ( See Top 100 in Musical Instruments ) #1 in Multieffects Processors
Color Name	Silver & Black
Compatible Devices	PC, Laptop
Connector Type	TRS, XLR
Customer Reviews	4.5 4.5 out of 5 stars (729)
Date First Available	September 9, 2009
Hardware Interface	USB
Hardware Platform	PC/Mac
Instrument Key	Any
Is Discontinued By Manufacturer	No
Item Weight	4.63 pounds
Item model number	FX2000
Material Type	Stainless Steel
Power Source	Corded Electric
Product Dimensions	19.02 x 8.54 x 1.75 inches
Signal Format	Analog
Supported Software	Ableton Live
Voltage	5 Volts

Behringer VIRTUALIZER 3D FX2000 High-Performance 3D Multi-Engine Effects Processor, Silver and Black

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