Well, it would make sense to be loud since in Japan arcades are probably pretty noisy and not being able to hear the music to a music game would suck, and well maybe the don't mess with the settings.
Who complains about an arcade game being loud. What a PUSSSSSSSSYYYYYYYY
I agree.
But in where I play in my country, sometimes stalls like Starbucks and the nearby Chapel often complain during Sundays about how loud the machine is. Happens often as the machine is located in the very entrace of the video arcade/game center.
Oh well, but thankfully less complaints about it now (as long as I don't play Mei with EQ ONLY)