I am a noob to Home Theater audio so take what I say with a grain of salt...
I've owned the BIC Venturi DV64 towers for about a month now and I really like them a lot.
If you're looking for towers with lots of bass, these are probably not your cup of tea. I have a powered sub setup, so big time low end was not a factor for me when deciding what to buy. These DV64 towers sound really good, nice and warm, with good, tight, punchy bass. I find them to be very accurate, with great midbass, midrange, and highs. Unlike some owners, I do not find the tweeters to be harsh at all, in fact just the opposite, they sound very tight and blend well into the soundstage. Voices are clear and melodious. The passive radiators are particularly cool, and they really do add a lot of bass to the speakers.
I broke them in for a week on full range, and they did hit freqs below the factory listed 29hz, but there was serious drop off below 35-40hz. I would assume the DV84s go a bit lower and louder. Audessey agreed with me on the DV64's range and crossed them over at the minimum of 40hz (which I have since revised to 60hz).
I've played 2 channel stereo using only the towers and found it most enjoyable. I cranked them up and they can get quite loud with no distortion, even rattling my patio doors with the bass.
All in all, I am very happy with them and I have no problem recommending them. Classical music is quite a pleasant experience with these speakers.
Hope this helps. I also have the DV62si, the DV52si, and the 62CLRS if you are curious about them, as well...
60" 1080p 3D Plasma Panel
3D 1080p Blu-Ray player
4K 7.2 Channel AVR