I have run the amplifier with two small Canton plus S and am absolutely thrilled by the sound in terms of clarity, spaciousness and foundation. I think my ears not to be trusted, what this part of the small, max. up to 70 W reliable Canton brings out. Now the negative .... processing, highly praised by some thing in which I delivered SA50 very poor. So when you press the power switch grinds on the front panel, a return spring in the switch also makes sounds when you press, what a feeling of distrust in the longevity triggers me. The volume control in turn describes an ellipse 'slackening' extremely loose in any direction, however, is working properly. The sockets of the input on the back are incredibly obliquely outwards away so inserted plugs look absolutely bent. This could be improved, and I would be willing to pay correspondingly more. However, this purchase has absolutely worth it, also I am assuming that the 'shortcomings' of my unit are no Series .....