It's going to be better to the brand owner, bad news to the consumers.
Currently, Marantz n Denon are built in Vietnam, with its highest end products built in Japan. Onkyo with Pioneer entry product built in Vietnam, mid-low and above products built in Malaysia.
Brand classification will likely to determine its class like in the world of another group of consumer products ......timepieces.
If Pioneer gets classed as entry level brand like Tissot, Onkyo and Denon into mid class like Rado and Longines, Marantz into high end brand like Omega... Malaysia plant can be shut down as wages goes up, low end product can be moved to Cambodia or Myanmar for production, while Vietnam is matured enuff to make mid end brand and products as Denon and Marantz under the current brand ownership had built up its technical foundations.
Higher-end brand and products still be produced in Japan or perhaps Taiwan since both governments are much friendlier to the European groups, without having the concerns that the mainland China government will steal their technology.
Costs, politics are 2 major factor that affects a corporation growth.