Wiring RCA - HI/LOW

I,ve decided not to get the Legacy amp and was wondering if Power Acoustik is a good brand to buy and on the site where I plan to buy it from it says it has

High/Low Level inputs With Floating Ground

does that mean that if the wiring output on the back of my deck are RCA that it won't be able to hook up to the amp.

Thanks for any suggestions!

YES Power Acoustik is a much better brand than Legacy, we have a 1200W Power Acustik in a jacked up toyota pushing 2 12 JL W3s and 2 1251X Audiobahn (thats our brand). The high low is for versitilty the high is incase you dont have RCA low output on your head unit, in wich case you would use high (speaker wires) as input into the amp (just dont forget you cannot use both at the same time)