One option is to take a look at the
Bose Environmental Speakers. Inquire from Manila's local distributor of Bose (Eleksis) or from their showrooms if they carry these speakers.
Eleksis
273 Connecticut St., East Greenhills
570-7353 / 570-7354
I have 2 pairs of the 151 at the patio ceiling corners facing the garden. Still working after nearly 7 years of harsh weather conditions in the Philippines (especially the scorching summers). Bought mine from the US.