たしかにこのへんは蓋の下にスピーカー仕込んでないなｗ
http://cdn.roland.com/promos/piano_design_awards/winners/images/grand_prize.jpg
http://cdn.roland.com/promos/piano_design_awards/winners/images/incentive_award_naohisa_uchiyama.jpg
http://cdn.roland.com/promos/piano_design_awards/winners/images/incentive_award_taro_saito.jpg
この斑鳩感あるデザインすき