Yamaha A-S2000 and REL-R305


Help please; I’m still a little confused here; not sure if the high level (speakers) out is permissible to feed my REL R-305 sub. I have two conflicting answers. Thanks.
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Thanks, yes, the REL R-305 portion is clear, however the amp section is where I get confused. The A-S2000 utilizes balanced amp design with a floating ground. Is it safe to use negative speaker terminal and feed to my sub without shorting out the amp’s output? Thanks again.
Here it is; the answer I got from Yamaha Technical Support:
"After speaking with one of your training guys, we found out that it can be done as long as the sub woofer input impedance rating is 100 ohms and above".
I really like the amp and I don't want to ruin it. I need a second opinion, please. Thanks.
Did you ever get an answer? Love the amp and planning to add a sub, but REL may not work. Too bad.