$70 · Pioneer TS-M2 Tune-Up Speaker

This vintage (1980s) Pioneer TS-M2 Tune-Up Speaker is a "single cone, high compliance roll-edge 4-inch speaker that uses an exceptionally large (85g) magnet for optimum mid/high tone sensitivity". It features a built-in attenuator for full control over mid-range/treble output. Connected in parallel to main speakers, it is designed to improve car audio systems but has other applications, such as a tweeter replacement. This is a single unit, tested and good cosmetically with only minor surface wear. Made in Japan. Specs: Frequency Response: 450Hz-20,000Hz Efficiency (dB/W/m): 91.5 Impedance (Ohms): 8 Power handling (Max): 20W Approx. 115mm long x 78mm wide x 32.5mm tall