| Model | TMA 250.4 | 
                    
                        | Bridge Mode 8 Ohms | 
| Continuous | 420W x 2 |  
| Program / Peak | 500W x 2 / 840W x 2 |  | 
                    
                        | Stereo Mode 4 Ohms | 
| Continuous | 220W x 4 |  
| Program / Peak | 250W x 4 / 440W x 2 |  | 
                    
                        | Stereo Mode 8 Ohms | 
| Continuous | 145W x 4 |  
| Program / Peak | 180W x 4 / 360W x 4 |  | 
                    
                        | Signal / Noise 20Hz - 20KHz | 90dB | 
                    
                        | Dimension (cm) | 59.1 x 53.9 x 19.7 | 
                    
                        | Weight (kg) | 21.73 | 
                    
                        | Distortion: (SMPTE-IM): | <0.05% | 
                    
                        | Frequency Response: | 20Hz- 20kHz ±0.1/3dB | 
                    
                        | Point: | 10Hz- 60kHz | 
                    
                        | Damping Factor, 1kHz: | >300 a 8 Ohms | 
                    
                        | Voltage Gain: | 40 (32dB) | 
                    
                        | Input Sensitivity @ 4 ohms: | 1Vrms | 
                    
                        | Input clipping: | 10 Vrms (+22dB) | 
                    
                        | Input Impedance: | 10 Kohms unbalanced, 20 Kohms balanced | 
                    
                        | Controls: Front: | AC Switch, Ch1 - Ch4 Gain Knobs, Rear: Mode Switchs | 
                    
                        | Indicators: | Power-On: Blue LED, Protection: Green LED, Limiter : Yellow LED, Clip: Red LED, Parallel-input: Yellow LED | 
                    
                        | Connectors, each channel: | Input: Terminal Block / Output: Screw-terminal Barrier Block | 
                    
                        | Cooling: | Continuously variable speed fan, front-to-rear air flow | 
                    
                        | Load Protection: | On / Off muting, overheat & short circuit protection | 
                    
                        | Power Supply: | 220-240V (110-120V) AC 50-60Hz |