You might have issues, depending on how loud you want to listen and how big your room is.
The only thing you have to worry about is damaging your speakers by clipping them at high volume that might require your speakers to draw more power from the amp than the amp can send.
This can cause distortion and damage your speakers.
Those speakers say 89db sensitivity, so as long as your room isn't too big, you should be fine.
Please realize that 50w x7 isn't 50w x7 all channels driven - that's 50w x2 channels driven. So with all 7 speakers going at the same time. From the owners manual - 50 Watts x 7, two channels driven at full power at 8 ohms,
20Hz – 20kHz, <0.07% THD, 350 watts total. 65W idle, 540W maximum.
The unit weighs 20lbs. It's probable that you'll be fine.
If you do happen to damage your speakers in the future, you can always use it as an excuse to upgrade.