I using the TN825 with a pair of Maggie mmg's and I'm very pleased how well it blends with them. It's not boomy at all , but defenitly adds the final touch at the low end. I find it blends best when set up with a sound level meter. I'm not shaking the building down but I wasn't looking for that. I am getting great clear, tight lows though this sub was designed to cut off at 25hz. I really like the HSU company. The are very helpful and the gentleman I bought from discounted the sub 50 bucks because of a very small scratch on the floor side of the cabinet which I could care less about. You never see it.
Even though it's only an 8 inch sub you still "feel" the lows as much as hear them. This sub comes with a 75 watt amp and you can use your speaker outs then connect your speakers to the sub, or a pre sub (LFE)out as I am.