High Level Input into Amp?

Hello guys,
I finished building my C-Note speakers but am a bit unhappy with the low-end so I want to build a subwoofer.
I am planning on using the Dayton SD215A-88 Driver for it.
My current amp is the Sony STR-DH100 which unfortunately does not have a sub out, so I am looking for a subwoofer amp for the Dayton Driver which can use High Level input from my STR-DH100.
Is this even possible with Class-D amps? If so id be happy about some recommendations. 🙂
 
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