The loudspeakers would not be damaged if the amplifiers were too weak, the other way round it is a problem but the loudspeakers do not break down if the amplifier has less power than the loudspeakers can handle. The amplifier also has enough power, it just wouldn't be as loud as if you bought this receiver, for example, which has more power:
Onkyo TX-NR6100 (7.2 channel, DAB+, FM)