
@Jahfar > The difference you are hearing is likely because the headphones have different sound specifications:
HDJ-1500
-
Frequency Response5 - 30,000 Hz
-
Impedance 32 Ohm
-
Maximum Input Power 4mW
-
Output Sound Level 108 dB/mW
HDJ-500
-
Frequency Response 5 - 28,000 Hz
-
Impedance 45 Ohm
-
Maximum Input Power 2 mW
-
Output Sound Level 105 dB/mW