Is income generated from renting sound amplification equipment used for holding sinful singing concerts considered permissible (halal) or impermissible (haram)?

It is not permissible to rent out loudspeakers to anyone who will use them for sinful purposes, as this constitutes cooperation in sin and aggression, which is forbidden by Islamic law. One must repent from such actions by abandoning them, regretting what has passed, resolving not to return to it, and disposing of the money earned from such rentals by spending it on good deeds, as it is ill-gotten wealth.