Trapezium
| Brand | KA, Kustom Acoustics |
| Manufacturer | Kustom Acoustics Inc. |
| Function | Speaker |
| Produced | 1979 |
| Country | United States |
| Form Factor | Floorstanding |
| Signal Path | Passive Hardware |
| Dimensions | 45.7 × 152.4 × 30.5 cm (W × H × D) |
| Frequency Response | 16Hz-30kHz ±2dB |
| Supertweeter | 1" Dome |
| Treble | 1.25" Dome |
| Midrange | 5" Cone |
| Bass | 12" Cone |
| Sensitivity | 90dB/W/m |
| Impedance (Nominal) | 8Ω |
| Crossover Frequencies | 200Hz, 2.5kHz, 9kHz |
| Recommended Amplifier Power | >50W |
| Enclosure Type | Transmission Line (TAL (Tapered Acoustical Line/Semi-Labyrinth)) |
| Finish | Walnut |
| MSRP (1979) | $1999 |