NAD 320bee

I have a 320bee, a great int amp. I wonder is there some way to use a sub with this amp? My previous NAD 7175 had a
loudness switch, which I enjoyed from time to time. With my new 320 bee I sometimes need a little more bass.
As you can see high-end audio is rather new to me. Suggestions? Thank you.
You can get a subwoofer with speaker level ins and outs, that what did!
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