Summary: I picked up a whole 7 channel NS loudspeaker system consisting of 2ea. NS-555, 1ea. NS-C444, 4ea. NS-333. When I first got these Yamaha NS-555 and hooked them up I new I got a great deal for the $400.00 I paid for the whole system. And also got a 120 watt X 7 channel Yamaha receiver to boot.
Summary: I am very pleasantly surprised by the quality of these speakers. I have had them for one month now, and am enjoying them more all the time. They replaced some vintage JBL LX-44s in my 2.1 music listening system, and I couldn't be happier.
Summary: Excellent speakers Yamaha has what I call a "flat" sound. Clarity and authenticity of each note seems to be the goal with Yamaha. Lots of other speaker systems embellish the bass, largely because many music lovers enjoy a stronger bass register in their music.
Summary: In short, these speakers are an incredible value. I Craigslisted a pair of these from a moving-sale (best way to get the best deals btw). I only paid $100 for the pair...which came with a crappy 1,000 Watt RCA receiver, queen mattress, and a mountain bike.
Summary: I bought these speakers because Yamaha has a great reputation in making great musical and sound products. However, these speakers were great dissapointment to me because they did not sound good.
Summary: Somewhat of a biased review because I've only used these paired with a subwoofer. I actually bought these over the NS-777's to save money because I knew my lower frequency range would be covered my my subwoofer and A/V receiver's built-in tuning algorithms.