Originally Posted by Dougb59
I'm new to NHT speakers, but I'm trading for some used Classic Fours and a Classic Three Center. I've found a used Classic 10 subwoofer (NHT N-10B) for about $100. I couldn't find much information on this model, and NHT told me that it was discontinued a year or so ago. They strongly recommended the current models (which look like cubes, rather than having the curved top and oblong shape of the Classic 10). The current 10" sells for the same price as the older Classic 10 on Amazon (about $500). It looks like the Classic 10 is ported, and quite a bit larger. I think the new ones are acoustic suspension. I'm very tempted to get the used Classic 10 because of the low price, but I don't want to waste money on something that won't be a good match with my Classic Fours, or that has other problems.
Given that the Fours already have two 10" subs, the Classic Ten isn't going to add much. You could argue that maybe it's worthwhile if you're running the Fours as large speakers and just using the Ten to enhance your center and rear channels, but I think the Fours could do a decent job of that same task. Even a 12" sub might not add much.
My advice would be to get the Fours and see how you think they do on their own, then shop for the subwoofer if you still think you need it. I wouldn't go less than 12" on the sub, though.
I used to have the SW12, which was a fairly similar design to the Classic Twelve. I was never particularly thrilled with it, and I was using it to augment bookshelf, not tower speakers.