Great education on sub. I certainly lack the knowledge of sub which I didn't know much when I set my first system 15 years ago.j
I am not a fan for movies so EP125 or EP175 would just do fine for me I guess.
Then I could go with any amps without worrying about the bass.
I would opt for the EP175. A sub too small is really too small.
The 125 might be best for a computer office setup or the college tv room IMO.
The NAD amp you had described has a Sub output.
http://nadelectronics.com/products/digital-music/D-3020-Hybrid-Digital-AmplifierThe Marantz does not appear to have one.
http://ca.marantz.com/us/Products/Pages/...roductId=PM6005