CL-4 (Rev. 2)
| Brand | KLH |
| Manufacturer | KLH Research & Development Corp. |
| Series | Research Ten |
| Function | Speaker |
| Produced | 1978 |
| Country | United States |
| Model ID | CL4 |
| Form Factor | Bookshelf / Stand Mounted |
| Signal Path | Passive Hardware |
| Dimensions | 36.2 × 68.6 × 33 cm (W × H × D) |
| Weight | 59lbs |
| Frequency Response | 30Hz-22kHz ±3dB |
| Treble | 1" Soft Dome |
| Midrange | 4.5" Paper Cone |
| Bass | 10" Paper Cone |
| Impedance (Nominal) | 8Ω |
| Recommended Amplifier Power | 25-150W |
| Power Handling | 150W |
| MSRP (1978) | £360 (Per Pair) |
| Notes | Changed woofer |