Is it permissible to take out the additional loudspeaker from the mosque to use it for nightly sermons at the home of the deceased's family, with a guarantee of its return and the borrower bearing responsibility for any damage?

Answer:

Setting up loudspeakers for gatherings at the deceased's family home is an innovation (bid'ah) that is impermissible. It is obligatory to avoid this and not participate in it. However, there is no objection to using a microphone that is surplus to the mosque's needs for permissible purposes.