From the Yamaha website:
For each and every one of its speaker units, the NS-2000A employs the newly developed Harmonious Diaphragm™ - made from a blend of ZYLON®, which has excellent sound velocity and minimal internal dissipation, and spruce, which is actually used in the soundboard of Yamaha grand pianos and is essential for emanating sound.
So not 100%.
The NS-2000A looks quite different from the NS-2000!