First of all: I can not understand some judgment here. My Köpfhörerstecker fits beautifully, comfortably and safely locked and the device can also be set easily quietly. Maybe it was even on the headphone and the wrong input level for which the amplifier itself can not. But now to my experience: The sound of an amplifier is always closely related to the boxes, which are "offered" him. My 10-liter three-way speakers bring over him wonderfully. From the PC, the laptop and from the satellite Receiver (use screen sometimes as TV via DVI). Am fully satisfied with (gefühltem) distortion, frequency response (perhaps because of the good customizable separate treble and bass controls), handling (luckily everything analogue) and the estimated 10-15 watts RMS / Channel. That it is PMPO power when power rating 100W, should be clear from the outset. This bad habit also make other vendors. Who more and better will have to pay more. Like everywhere. My expectations were more than fulfilled - full 5 stars.