The radio range is for my purposes perfectly fine, transmitter is on the ground floor, also through walls and ceilings no problem with the signal transmission (to floor and basement), works on the whole plot incl. Garages. The sound quality is satisfactory for the price, could have something more brilliant heights. At higher volumes, the system distorted, especially when activating the Bass Boost function, but for "background music" applications in lower to medium volume balanced sound, even in the low frequency layers (with Bass Boost activation).
For the price, the system is certainly worth a buy recommendation - I'll buy myself another set.
