Sometimes companies make failed products, even sennheiser

Sometimes companies make failed products, even sennheiser, techmoan, 4k, sennheiser surrounder, surrounder, sennheiser, surrounder pro, pro logic, dolby pro logic, neck speaker, neck, speaker, neck phone, neckphone, surround sound, surround, wearable, retro tech, retro tech speakers bizarre, old, audio, hifi, dsp pro, dsp, gadget, wired, science technology.