[XDr4g0nX]’s bass guitar is 3D printed ... This one has hefty steel bars for rigidity, though it uses a Yamaha neck rather than 3D-printing the whole instrument. The main body of the ...

But Yamaha’s engineers decided that a 4.1.2-channel arrangement was preferable, because it allows more space in the soundbar to fit the bass drivers they wanted, and allows for a wider sound.