Kit 603
| Brand | SEAS |
| Manufacturer | SEAS Fabrikker A/S |
| Series | Professional Sound |
| Function | Speaker (Kit) |
| Produced | 1980 |
| Country | Norway |
| Form Factor | Bookshelf / Stand Mounted |
| Signal Path | Passive Hardware |
| Dimensions | 40 × 66 × 31.7 cm (W × H × D) |
| Frequency Response | 30Hz-25kHz |
| Treble | 1" Dome (SEAS H 107) |
| Midrange | 4.5" Paper Cone (SEAS 11F-M) |
| Bass | 13" Paper Cone (SEAS 33F-WB) |
| Sensitivity | 91dB/W/m |
| Operating Power (DIN 45500) | 3.2W |
| Impedance (Nominal) | 8Ω |
| Crossover Frequencies | 600Hz, 3kHz |
| Power Handling (Nominal, DIN 45573) | 80W |
| Power Handling (Music, DIN 45500) | 150W |
| Enclosure Type | Bass Reflex |
| MSRP (1980) | $159 |