First Time Setting Up a Subwoofer - Atrium Sub10

Greetings, all.

I'd always thought that a sub needed at least a five channel amp. But from what I read last night, in preparation for installing my outdoor speakers (a pair of Atrium 5's and a Sub10), it appears that I can use a two channel amp – one channel taking white/green and the other taking red/black with the two 5's wired per usual into those same channels. (The attached image is from Polk's manual for the Sub10/Sat30 combination.)

So two questions -

1/ Is this correct?

2/ Will my old Luxman R-115 (70w into 8Ω) do the trick? (Its specs are at https://www.hifiengine.com/manual_library/luxman/r-115.shtml) I'm not sure if the amp's 20Hz to 20kHz frequency response will be sufficient, or if it even matters.

Thanks!

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“Anti-intellectualism has been a constant thread winding its way through our political and cultural life, nurtured by the false notion that democracy means that 'my ignorance is just as good as your knowledge.'
- Isaac Asimov

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