Nascho is really famous in Karachi and deals in top brands. Their shop is near The Sports Bar and Evolution. Their number is 35831257.
There is another one known as Desert Sound. But mind you, they are on Zamzama. So get ready to be charged 3x for their service charges. Really hi-fi shop with some awesome systems. Better than Nascho.
DESERT SOUND
22-C/ll, 2nd Commercial Lane, Zamzama
Phase 5, D.H.A.
Karachi, Pakistan.
Tel: (92-21) 582-2903, 582-2904