What's the difference between Harman Kardon's original stereo and patented stereo?

1, Harman Kardon's original stereo is high and low, with insufficient elasticity in middle and low, and poor surround sound and stereo effect.

2. The engineers of Harman Kardon's patented acoustics will specially adjust this model, so that the best acoustics can be achieved no matter where in the carriage. Harman Kardon patented stereo, with patented R-ring design, achieves louder sound, heavier bass and brighter treble at the same sound volume.