Airspace above Class B and Below Class A is Class E........Class B is between 7000 ft and 12000 ft and below depending on the Airport. Of course they all have a 30 mile Mode C veil. So yes you can fly 500 ft above Class B and not talk to us. Is it smart? well if you know the stars and sids it can be okay. If you dont there could be issues. Always wise to monitor the appropriate atc freq. If your paying attention you will recognize when our the traffic being quoted.