4. Recording, communication, or information retrieval equipment
  5. Video or audio transmission, recording or playback equipment
  6. Speaker or housing therefor

Polk Investment Corporation

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Bandpass woofer and method

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer
Patent

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Bass-reflex loudspeaker

Acoustics – Diaphragm and enclosure – Reflex baffle
Patent

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Combined speaker and integral stand

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Speaker or housing therefor
Patent

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Compact and efficient sub-woofer system and method for installat

Electrical audio signal processing systems and devices – Binaural and stereophonic – Hearing aid
Patent

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Edge surround for speaker

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Element or attachment
Patent

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Profile ID: LFUS-PAI-P-59097

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