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@3000swin normalna sprawa są takie głośniki na ogół wystepuje w tych ze sztywna membrana : metalowe, Kevlar itp i nazywane to jest korektorem fazy.
@3000swin:

What’s the difference between a dust cap and a phase plug?

Why use a phase plug?

- Reduced moving mass
- No gluing or other interaction with the cone
- Better cooling of the voice coil
- No cavity resonances
- More consistent high frequency response

Why use a dust cap?

- Avoid air leakage and “chuffing” noise
- Larger cone area
- Conceal a small voice coil with a