Bowers & Wilkins BB 6W Back Box For In-Wall Speakers (Each) Cin/Opti-0.75m a cable’s characteristic impedance is

a cable’s characteristic impedance is also crucial for optimal performance

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Bowers & Wilkins BB 6W Back Box For In-Wall Speakers (Each) Cin/Opti-0.75m a cable’s characteristic impedance isThe Bowers & Wilkins BB6W back box increases sound insulation to adjoining rooms and provide the fire safety barrier often required by building regulations. When used in solid construction, the backbox will define an appropriate working volume for the speaker which may need to extend beyond the boundaries of the wall frame.