Yes if he is looking for something really upscale like mosconi or original jdl or something like that then yeah its not a place for beginners but stock JDM speakers of any car kuch farq nai itnay low prices item mein koi itna fraud nai karta wahan they cost just a mere 2000-3000 rupees a pair.
As for right direction i gave him both options if he want new original branded stuff i have mentioned where to get them.
Again for a simple person who is satisfied with Vitz stock speakers do you honestly think frequencies matter to him. Most people in Pakistan i can guarantee wont spend more than 20K for sound system (excluding LCD)
He doesnt need any sort of setup just some better speakers that it