My receiver is sitting on an open table with space around it and nothing on top of it.
For some reason, people tend to have a lot of fear for receivers.
As stated before - more sensitive bookshelves do not guarantee
better overall sound quality. Some of them speakers can get harsh
at higher volumes. The Sony is rated to handle 8, 6, 4 ohm loads
I would be more concerned, if the speakers were 4 ohms.
More power tends to generate more heat. If you are really concerned,
then get a fan. > If you want different speakers, then exchange your
Pioneer speakers. >> It is not easy for Pioneer to beat-up my 90 watt
receiver.
The biggest difference you will find/experience, is when-ever you get a
decent subwoofer.
However as in all situations, you need to find the limit for the Pioneers,
and their tweeters.