I think these make excellent entry to low mid-fi speakers as they can hook directly to a TV, and sound pretty much the same no matter where you point them. They stay clean and neutral at all but really high volumes. Since they don't require other electronics to work, I think they are the best deal around for budget stereos.
Also, these would be known as Constant Directivity. Bass sound pressure waves measure in the dozens of feet, and decrease in size, with increasing frequency. This means that all speakers become more directional at high frequencies, but the wave guide JBL uses makes this far less noticeable.