Kit 503
| Brand | SEAS |
| Manufacturer | SEAS Fabrikker A/S |
| Series | Professional Sound |
| Function | Speaker (Kit) |
| Country | Norway |
| Form Factor | Bookshelf / Stand Mounted |
| Signal Path | Passive Hardware |
| Frequency Response | 25Hz-20kHz |
| Treble | 1" Dome (SEAS 86H) |
| Midrange | 5" Paper Cone (SEAS 13F-GM) |
| Bass | 13" Paper Cone (SEAS 33F-WK) |
| Sensitivity | 92dB/W/m |
| Operating Power (DIN 45500) | 2.5W |
| Impedance (Nominal) | 8Ω |
| Crossover Frequencies | 700Hz, 3.5kHz (SEAS D 030) |
| Power Handling (Nominal, DIN 45573) | 60W |
| Power Handling (Music, DIN 45500) | 120W |
| Enclosure Type | Sealed |
| Enclosure Volume | 50l |
| Finish | Black, Palisander, Teak, Walnut (Cabinet Optional) |