These are the brands to go for when looking for a quality audio just look out for fakes, however a good speaker is nothing without a good H/U and a good amplifiers. What i mean by good amplifiers.... Amplifiers that has hi/lo crossovers, good ground and hi efficiency and nowadays the stock H/U are getting better fin a H/U that got a good processor so that you can hear the full potential of your speaker and create a good imaging and surround sound.
SHH are getting more good brands eg. Focal, MTX, Rockford Fosgate, Helix, Sony, Kenwood, Alpine, Alphasinik, DUB audio, Soundstream, Audiobahn they got so many choices and acessories and the prices are not too bad either.
Belait: i dont know the shops there but i heard XV Audio is very good distributor of Rainbow, Stinger etc
Tutong: A7 (what ever the new name is but people still call it jimmy's),
Polcom(Or some people call chris)
Ayurveda (Best tune)
Brunei Muara: SHH(Good and cheap audio and acessories but need to work on their workers),
Everstrong(Good workers, quality products but price are a too high),
Systemair (Good price and workers especially those Atomic, formula X, Zenon a good quality why some people wrecked the we'll they didnt watch out on the impedence)
Car Quest: ( very good craftsmenshp, Quality products but to pricey but labour is cheap and Quality)
W.R electronics (kicker distributor)