I have heard several NHT models, but not specifically the 3.3s. I *own* Mirage M5si's (one model down from the 3si's), and have owned them for 19 years (and really glad I still have them). They still anchor my 7.2 home theater setup and could just as easily slide into (for all the improvements in speakers in two decades) my analog-based 2-channel system.
Everything Matt said about speakers of this series is true. They have a midrange like a mini-monitor, yet have smooth treble and deep extended bass. I found the NHTs more forward than the Mirages. The Mirages simply sound "right" without exaggerated crispy highs or bloated bass. I even power mine with an Adcom GFA-7700 amp; it's a good match that has worked for 10 years.
The NHTs are 31" deep, which could create a placement problem. The Mirages like about 3' separation from the wall behind them. That's usually not a problem because the speakers are only about 8" deep.
Everything Matt said about speakers of this series is true. They have a midrange like a mini-monitor, yet have smooth treble and deep extended bass. I found the NHTs more forward than the Mirages. The Mirages simply sound "right" without exaggerated crispy highs or bloated bass. I even power mine with an Adcom GFA-7700 amp; it's a good match that has worked for 10 years.
The NHTs are 31" deep, which could create a placement problem. The Mirages like about 3' separation from the wall behind them. That's usually not a problem because the speakers are only about 8" deep.