After intense internet research I came across a description of the boxes of Lexfield SP4080A. All of the above deficiencies are not noted here: no noise, Boxes individually controllable via remote control, very visually appealing and especially a well-balanced sound. The basses are weak, even when switching on the bass boost, the only really notable limitation.
Nevertheless, I am with the purchase, the value for money as fast delivery very pleased and can recommend the product. As a complement for listening outdoors really suitable.