Your wattage figures for your speakers refer only to the maximum they can handle. Your Sony can only provide 100 watts maximum per channel so those 200 watt speakers are only half powered at maximum output by the Sony.

If more volume is desired, consider looking for highly sensitive speakers with numbers close to 100 dB rather than 90 dB. They will produce considerably more volume per watt.

For bass, obviously a high quality sub woofer is necessary. World class subwoofers are made by makers who specialize in them. Our frequent poster, jostenmeat, have posted much about them. Use the search feature to search for his references to such brands as SVS & HSU. Be prepared to spend over $500 for a sub to get a really capable one.

You can start with: http://www.hometheatershack.com/forums/subwoofer-tests/6015-index-subwoofer-tests-manufacturer-model.html