A:AnswerVery subjective, and depends a lot on the level you will be playing at to fill your room with quality sound. Try to buy where you can listen to different speakers first. This receiver can easily power 1000$ worth of speakers in 5.1 use.
A:AnswerLOL They'll work, it'll just reduce the rated output per channel. I assume they're 8 ohms so instead of a "realized" 135 watts per channel you'll realize say 110 watts per channel.
A:AnswerWith that system you do not need an additional receiver. The Blu-Ray player has receiver capabilities. The speakers simply plug into the back of the Blu-Ray player and you're good to go.
A:AnswerHi Ed,
Please check the system requirements of this receiver in the link below.
https://docs.sony.com/release//Help_4584081111.pdf
Thanks,
>Joffrey