. . . "ion of the Health Officer, or his or her designee, upon such terms as will not impair public health as determined by the Health Officer using reasonable standards; except that no loudspeaker or amplifier may be used or operated upon any street or from any building or vehicle for the purpose of advertising or attracting the attention of the public from 9:30 p.m. to 10:00 a.m. the following day on M" .