Pyle PSUFM835A 800-Watt 2-Way Speaker System

No built in way of doing it but if you unscrew the speaker grill (4 screws) you'll be able to see two wires to the leds coming from inside the unit itself sandwiched between the speakers and the cabinet opening. The leds are glued to the underside of the speaker grills. Snipping or unsoldering either one of the main lead wires will permanently disable the feed to the leds. Another less destructive and reversible way is just to use black electrical tape around the leds to block out their light output then replace the speaker grills. Just be aware that due to the flimsy construction of the thin particle board cabinet, it is easy to loose the grip of the mounting screws. Just take care when remounting the speaker grill. Try not to over tighten or force the mounting screws in.

4 pounds each . but not loud could be better