Global Brands Development Limited is an American owned manufacturer of architectural speakers and other audio and video products. "Flatline Acoustics U.S.A" is our brand name that covers more than 44 SKU of in ceiling, in wall and outdoor speakers. "X-cell AV" is another brand that includes wireless microphone, headsets, assistive listening system,infrared classroom system, megaphone, visual presenter. Before coming together to create Global...