Thanks for the reply. As most time I play music from my computer, I'm looking for a AMP with built-in USB DAC. after some more research, I found the Cambridge Audio 351a, which meets my needs and even more power, 45W pc.

Hi, First of all I admit I'm new to the hifi world. Still learning and asking stupid questions around . The background is that I have a small creative D100 active speaker. To me it plays pretty loud and room filling (5m*5m). But after checking the specs, I'm surprised to see its output power...