SONY Power Amp question:

As an S-master Pro design it will sound a bit better than ordinary digital HT receivers but consider that this was an entry model of the series. Going up to DA5000es, DA7100es and DA9000es there is more juice in terms of sound and power in 2ch.
But it will drive your speakers at satisfactory levels.

Well sound will come out. At low volume might be OK. 

i answered your other, duplicate post

it should work fine

Do not feel the Sony will come close to seeing what these speakers are capable of. I paired these with a Rotel 990 series power amp. Match made in heaven with tremendous low end grunt. The 990 had a huge power supply with great power into low impedance loads.

It was always amazed how the 5si's, using two generic 6 1/2" drivers, could handle all that power and produce such palpable bass down to 30hz!