Canada’s PSB Speakers is a company best known for making loudspeakers, but it’s also been designing and manufacturing headphones for the past 10 years. The latest additions to its portable audio lineup are the M4U TWM true wireless earbuds and M4U 9 wireless ANC headphones, both of which feature the company’s proprietary RoomFeel processing and Audiodo Personal Sound technology.We’ll cover both those features in a bit and lay out what makes them special, but let’s first discuss details of
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