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  2. Bass reflex - Wikipedia

    en.wikipedia.org/wiki/Bass_reflex

    Two-inch port tube installed in the top of a Polk S10 speaker cabinet as part of a DIY audio project. This port is flared. Unlike closed-box loudspeakers, which are nearly airtight, a bass reflex system has an opening called a port or vent cut into the cabinet, generally consisting of a pipe or duct (typically circular or rectangular cross section).

  3. Reverse telephone directory - Wikipedia

    en.wikipedia.org/wiki/Reverse_telephone_directory

    An unpublished number is also excluded from directory assistance services, such as 411. Landline telephone companies often charge a monthly fee for this service. As cellular phones become more popular, there have been plans to release cell phone numbers into public 411 and reverse number directories via a separate Wireless telephone directory ...

  4. Loudspeaker enclosure - Wikipedia

    en.wikipedia.org/wiki/Loudspeaker_enclosure

    These designs can be considered a mass-loaded transmission line design or a bass reflex design, as well as a quarter wave enclosure. [38] Quarter wave resonators have seen a revival as commercial applications with the onset of neodymium drivers that enable this design to produce relatively low bass extensions within a relatively small speaker ...

  5. Telephone directory - Wikipedia

    en.wikipedia.org/wiki/Telephone_directory

    A telephone directory, commonly called a telephone book, telephone address book, phonebook, or the white and yellow pages, is a listing of telephone subscribers in a geographical area or subscribers to services provided by the organization that publishes the directory. Its purpose is to allow the telephone number of a subscriber identified by ...

  6. Bass amplifier - Wikipedia

    en.wikipedia.org/wiki/Bass_amplifier

    This was a 26-watt tube amplifier with a single 15" speaker. In 1954, the Bassman was redesigned to use four 10" speakers. This speaker cabinet was an open-back design; as such, it had poor low-frequency efficiency and was prone to blowing speakers when used for bass because of the lack of damping.

  7. Electronic Yellow Pages - Wikipedia

    en.wikipedia.org/wiki/Electronic_Yellow_Pages

    According to market research company the Kelsey Group, advertising in online yellow pages is rapidly expanding but still only retain less than 7% of the total market, including online and print. The reason for this is that traditional yellow pages publishers, such as the phone companies, have big sales forces to approach local businesses.

  8. Yellow pages - Wikipedia

    en.wikipedia.org/wiki/Yellow_pages

    Experian/Hitwise reported in January 2011 that the search term "yellow pages" was one of the top 50 search terms across all search engines and all search terms (millions of search terms). This made "yellow pages" one of the most searched-for things on the Internet in 2011. The Yellow Pages Association said in February 2011 that 75 percent of ...

  9. Loudspeaker - Wikipedia

    en.wikipedia.org/wiki/Loudspeaker

    The hole below the lowest woofer is a port for a bass reflex system.. A loudspeaker (commonly referred to as a speaker or, more fully, a speaker system) is a combination of one or more speaker drivers, an enclosure, and electrical connections (possibly including a crossover network).

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