SMT III
| Brand | Kustom Acoustics |
| Manufacturer | Kustom Acoustics Inc. |
| Function | Speaker |
| Produced | 1976 |
| Country | United States |
| Form Factor | Floorstanding |
| Signal Path | Passive Hardware |
| Dimensions | 40.6 × 91.4 × 33 cm (W × H × D) |
| Weight | 103lbs |
| Treble | 1" Dome |
| Midrange | 5" Cone |
| Bass | 12" Paper Cone |
| Impedance (Nominal) | 8Ω |
| Crossover Frequencies | 775Hz, 3.5kHz |
| Power Handling | 250W |
| Finish | Walnut, Imitation Slate Top |
| MSRP (1976) | $479 |