The " professional " version launched some nine years after its first introduction on the back of the popularity of the NS @-@ 10 among engineers . The revised version , with everything including the logo and connection panel orientated horizontally , was badged " NS @-@ 10M Studio " . Improvements included a new tweeter and crossover to address the problem in the treble , better connection terminals , and a sturdier cabinet that no longer accommodate grilles . The Studio reincarnation also have improved power handling – 60 – 120 W. In excess of 200 @,@ 000 pairs of " Studio " alone was sold throughout the world .