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  2. JBL - Wikipedia

    en.wikipedia.org/wiki/JBL

    1946 – JBL creates the original 'JBL signature' logo with an exclamation (!) in black and white. Designed by Jerome Gould [8] 1946 – Lansing leaves Altec and founded a new company, James B. Lansing Sound Inc. 1947 – JBL has a 15" speaker (38 cm), model D-130, using for the first time a 4" (100 mm) voice coil in a speaker cone; 1949 ...

  3. Fiio F9 - Wikipedia

    en.wikipedia.org/wiki/Fiio_F9

    F9 and F9 Pro have V-shaped yet reasonably well-balanced signature with increased bass and utilize almost identical technological designs. [2] Both F9 and F9 Pro have a three-driver design with a single 9.2mm dynamic driver and two balanced armature drivers, however, F9 Pro employs Knowles TWFK-30017-000 balanced armature drivers, which results in further improvement of sound quality.

  4. User guide - Wikipedia

    en.wikipedia.org/wiki/User_guide

    User's guide for a Dulcitone keyboard. A user guide, also commonly known as a user manual, is intended to assist users in using a particular product, service or application. It is usually written by a technician, product developer, or a company's customer service staff. Most user guides contain both a written guide and associated images.

  5. Wireless speaker - Wikipedia

    en.wikipedia.org/wiki/Wireless_speaker

    Wireless speakers are loudspeakers that receive audio signals using radio frequency (RF) waves rather than over audio cables. The two most popular RF frequencies that support audio transmission to wireless loudspeakers include a variation of WiFi IEEE 802.11 , while others depend on Bluetooth to transmit audio data to the receiving speaker.