TD500.4DSP 
Stereo Mode (Both Channels Drive)4 ohms (RMS) 500W x 4 / 8 ohms (RMS) 250W x 4
Bridge Mono Mode Input Sensitivity (Limit Off)8 ohms (RMS) 1000W x 2
Input Sensitivity0.9-1.1V (0+/-1dBv)
Input Impedance20k ohms balanced or 10k Ohms unbalanced
Frequency Response20Hz ~ 20KHz (+0/-1dB) (at 10dB Rated Output Power 8 ohms)
Voltage Gain34+/- 0.5dB
THD+N (Ref.1K 1/8 Rated Power, A-Weighted)<0.15%
S/N rate (Ref. Rated Power, A-Weighted)>95dB
Crosstalk (Below Rated Power)>50dB
Damping Factor (1K 8 ohms)>180
Power SupplySwitching Power Class D