Model Twelve (Rev. 2)
| Brand | KLH |
| Manufacturer | KLH Research & Development Corp. |
| Function | Speaker |
| Produced | 1967 |
| Country | United States |
| Form Factor | Floorstanding |
| Signal Path | Passive Hardware |
| Dimensions | 56.5 × 73.7 × 38.1 cm (W × H × D); 30.5 × 6.4 × 0.9 cm (W × H × D) |
| Weight | 109lbs |
| Frequency Response | 30Hz-18kHz |
| Treble | 1.75" Paper Cone |
| Midrange | 3" Paper Cone (x2) |
| Bass | 12" Paper Cone |
| Impedance (Nominal) | 8Ω |
| Crossover Frequencies | 600Hz, 2.5kHz |
| Enclosure Type | Sealed |
| Enclosure Resonance | 35Hz |
| Enclosure Construction | 1" Plywood |
| Finish | Walnut |
| MSRP (1968) | $275 |
| Notes | Crossover revision. External frequency contour controller. |