Which NHT? I don't see something like that. Frankly I think subwoofers should have at least a 12" cone to fill bigger spaces. I like the ones where there are multiple ports and you can plug one or both to adjust the sound to your taste and space. How are you mounting the speakers? Can you get/make small shelves matching the heirloom cabinet? That would look nice, instead of just stuck up on the wall. mmmm...what was the model of your receiver? I wonder if that has any adjustments.