OK, I finally had time to some serious auditioning of the NS-B2111. This is my mini-review.
I am very impressed and think they represent a strong value. As I mentioned in a previous posting, my initial impression was that they are bright. But that was on someone else's system, which I did no serious inspection of. I believe that person must have had the treble control turned up, because they did not strike me as bright in my system.
These impressions are based on the speakers being positioned on short pedestals (about 2 feet tall), and tilted up toward ear level. The speakers were broken in and being driven by a Denon receiver.
They have frequency response that strikes my ear as quite smooth, until you get down to the mid-bass. They have considerable tubbiness in this region. The result is that vocals and acoustic guitar are given excessive chestiness. One some recordings it really ruins the experience. Therefore, placement away from walls is essential to prevent this problem from being any worse. (I had them setup 3-4 feet away from the back wall.)
The enclosures are very handsome, but are undoubtedly responsible for these problems in the mid-bass. They resonate quite a bit, and I see why some folks have modded their cabinets. I have to wonder how much of a difference it really makes, though. Is the problem alleviated, or only made tolerable?
This enclosure problem means that the higher you crank the volume, the bigger the resonance. These speakers quickly go from hi-fi at low volumes, to more like mid-fi at high volumes. Can't say this is a surprise, though, when buying speakers in this cost category.
On most recordings, the impressive imaging allows you to forget about the overly-full mid-bass. In fact, I believe this is the best sound I could ever expect to hear for less than $100 (only counting brand new products). Someone asked earlier in this thread if the NS-B2111 is really that much better than the Minimus 7, that they should consider the upgrade. My answer is Yes, they are unquestionably a grade above the Minimus 7. Although I didn't A/B compare them to my own pair of Minimus, I can confidently say that. They play louder, are more dynamic, have better imaging and certainly look a lot better. But then they are at least twice the size of the Minimus, so think twice if space is a consideration for your needs. And while the Minimus' sound balance works fine mounted in a cabinet, the 2111 would likely not benefit from this placement.
Those of us who are hi-fi enthusiasts sometimes have a need for a basic, inexpensive set of speakers for listening in an office/work/common area environment -- something better than the average boom box or all-in-one system. I think these speakers would perfectly suit this low volume, background playback role. And because of their full mid-bass, they should sound warm at very low levels. And when it comes to after hours listening, when you're burning the midnight oil, they'll still stand up to a little bit of cranking. (Which you can't say about PC speakers that most people use all day long in offices.) And, if they were to grow legs and disappear, your wallet wouldn't be utterly devastated (there are all-in-one ipod speaker systems, that are more attractive theft targets, that cost more!).
If Best Buy/Insignia were to create a matching center channel unit for the NS-B2111, they would have a strong alternative to most mass market HTIB (home theater in a box) systems. I think they're making a mistake not capitalizing on this market. Although I must admit that I didn't actually audition them in this type of configuration, and it's possible that the chestiness would hamper the intelligibility of movie dialogue. It's also important to note that they aren't magnetically shielded, so they can only be used near plasma, LCD and DLP displays (not traditional CRT). Plus, if you position the chosen "center" speaker sideways, you'll have to improvise something to prevent this rounded enclosure from rolling away.
For stereo listening, this speaker is all that the "Average MP3-Listening Joe" would likely need. But anyone who values true bass will need a sub. And I suspect you'd need to spend twice as much on the sub, to get one that does the same justice to the bottom end as these Insignias due to the upper range. Plus, you're going to need some stands to hold them up where they belong.
Personally, I probably won't be keeping these, since I have plenty of other, better speakers. These simply don't do anything better than the other transducers in my collection. But if you're looking for a solution for adding sound to an occasional-use room that currently doesn't have speaks, these are perfect. Serious listeners on a budget, however, should look elsewhere for something of a higher caliber on the used market.