japan made Aiwa bookshelf speakers, likely model SX-NAJ312. only 7000 serious buyers viber Model Identification: The speakers are identified as part of the Aiwa SX-series, frequently listed as models like SX-NAJ312 or similar NSZ series. Design and Features: These are typically 3-way or 2-way bookshelf speaker systems, often featuring a 6-inch woofer and designed for home stereo systems. Specifications: They commonly operate at 6 ohms impedance with power ratings around 80 to 200 watts.