There seems to be no discernable differences between the 590 and the 1610. Check out the side by side and compare them. Right now at Amazon the 1610 is a bit cheaper than the 590.
Originally Posted by afrogt /forum/post/18239696
Even though your comparison charts shows everything is the same, if you look at the back of each receiver you'll notice the 1610 has TWO SETS of front speaker terminals, A & B. The 590 only has Speaker A terminals.