I solved the problem of the buzzing transformer by replacing it with a 12 volt pulse power supply unit from a dead laptop. Now there is no buzz at all. Got pros: Good sound for such a price (~2300). A convenient remote unit with volume control and a headphone jack (I bought it because of it). Compact speakers. Got cons: The transformer is still humming. The headphone jack is directly connected to the input, without volume control.
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