Kawai makes two series of grand pianos: GX and GL. The GX line (formerly RX), which is sold in North America in a version known as the BLAK series, is the most expensive and has the best features. It is designed for the best performance, whereas the GL series is designed more for efficiency in manufacturing, with fewer refinements. All the GX pianos feature a radial beam structure, converging together and connected to the plate using a cast-iron bracket at the tenor break. This system makes for a more rigid structure, which translates into better tone projection. The soundboards in the GX models are tapered for better tonal response; and the rims are thicker and stronger than in the GL models, and are made of a blend of open- and closed-pore hardwoods to improve the tone. The Kawai Millennium III actions used in both series now have hammer-shank stabilizers, designed to retain power by keeping the shank from wavering under a heavy blow. All GX pianos have agraffes, duplex scaling, lighter hammers (less inertia), and Neotex synthetic ivory keptops; and come with a slow-close fallboard. The GX grands get more precise key weighting, plus more tuning, regulating, and voicing at the factory. The cabinetry is nicer looking and of better quality than that of the GL series pianos, with the polished ebony models in the new BLAK series receiving a UV-cured, scratch-resistant coating on the music rack.
In 2013, the GX BLAK models replaced the previous RX series. The changes from RX to GX include a pinblock that is fitted to the plate flange and more securely attached to the case for better tuning stability, and the front stretcher has been made thicker, stiffening the structure, and thus both conserving tonal energy and contributing to tuning stability. The GX rims use alternating layers of two different hardwoods, one chosen for tonal power, the other for warmth. There have also been some changes to the scale designs and soundboard taper.
In the fall of 2015, Kawai consolidated its GM and GE piano lines into a single, new GL line of models: GL-10 (5'), GL-20 (5' 2"; 157.5cm), GL-30 (5' 5"; 165.1cm), GL-40 (5' 11"), and GL-50 (6' 2"). The GL models share some important features with the higher-end GX models: Millennium III action with hammer-shank stabilizers, agraffes, stronger pinblock/stretcher design, longer keys, full sostenuto pedal, and soft-close fallboard, among others. However, the GL models have a single-wood-variety hardwood rim, rather than the blended hardwoods of the GX series; a solid rather than a vertically laminated bridge, without cap; acrylic rather than Neotex keytops; a simpler beam structure in the smaller models (GL-10/20/30); and a simpler cabinet design and less elaborate interior finishing. The GL-20/30/40/50 models are all built in Japan; the GL-10 is made in Indonesia. The inclusion of several GX-level features makes the GL-10/20 models significant steps up from the discontinued GM models.
Kawai's quality control is excellent, especially in its Japanese-made pianos. Major problems are rare, and other than normal maintenance, after-sale service is usually limited to fixing the occasional minor buzz or squeak. Kawai's warranty service is also excellent, and the warranty is transferable to future owners within the warranty period (a benefit that is not common these days). The tone of most Kawai pianos, in my opinion, is not as ideal for classical music as some more expensive instruments, but when expertly voiced, it is not far off, and in any case is quite versatile musically. In part because the touch is so good, Kawai grands are often sought by classical pianists as a less-expensive alternative to a Steinway or other high-end piano. Kawai dealers tend to be a little more aggressive about discounting than their competition (Yamaha). There is also a thriving market for used Kawais.