The answer depends on the sensitivity (dB @ 1w/1m) specification for the speakers you plan to drive. Cranked up should hit about 104 dB with an average 88dB speaker sensitivity, which is fairly loud.
The above chart is from the data sheet for the amp power stage in this unit (TAS5342A). The power supply is 24v, so the "4 ohm: 80 W x 2" in the Drop description is already an overstatement. At 8 ohms, the power output will be 40W x2.