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  2. Constant-voltage speaker system - Wikipedia

    en.wikipedia.org/wiki/Constant-voltage_speaker...

    Constant-voltage speaker systems are also commonly referred to as 25-, 70-, 70.7-, 100 or 210-volt speaker systems; distributed speaker systems; or high-impedance speaker systems. In Canada and the US, they are most commonly referred to as 70-volt speakers. In Europe, the 100 V system is the most widespread, with amplifier and speaker products ...

  3. Surround sound - Wikipedia

    en.wikipedia.org/wiki/Surround_sound

    These are arranged in three layers: A middle layer of ten speakers, an upper layer of nine speakers, and a lower layer of three speakers and two sub-woofers. The system was demonstrated at Expo 2005 , Aichi , Japan , the NAB Shows 2006 and 2009, Las Vegas , and the IBC trade shows 2006 and 2008, Amsterdam , Netherlands .

  4. Sound reinforcement system - Wikipedia

    en.wikipedia.org/wiki/Sound_reinforcement_system

    In the 1960s, horn loaded theater and PA speakers were commonly columns of multiple drivers mounted in a vertical line within a tall enclosure. The 1970s to early 1980s was a period of innovation in loudspeaker design with many sound reinforcement companies designing their own speakers using commercially available drivers.

  5. How to Plan for an International Marathon - AOL

    www.aol.com/plan-international-marathon...

    More than 840,000 people submitted entries to the 2025 London race (for only about 50,0000 bibs), and the recent 2024 Berlin Marathon broke the record for the largest field ever with 54,280 ...

  6. Advice Every New Runner Needs to Hear According to Top ...

    www.aol.com/advice-every-runner-needs-hear...

    She has qualified for several Olympic marathon trials and has run more than 35 marathons. Hollis Tuttle is an RRCA-certified run coach and Lululemon studio trainer.

  7. Passive radiator (speaker) - Wikipedia

    en.wikipedia.org/wiki/Passive_radiator_(speaker)

    The middle speaker is a real loudspeaker. The top and bottom cones are passive radiators. In the same way as a ported loudspeaker, a passive radiator system uses the sound pressure otherwise trapped in the enclosure to excite a resonance that makes it easier for the speaker system to create the deepest pitches (e.g., basslines). The passive ...

  8. 35 Christmas Roasts Pretty Enough To Be Your Holiday Centerpiece

    www.aol.com/35-christmas-roasts-pretty-enough...

    Salmon En Croute. A cheesy, garlicky, spinach mixture is the perfect balance to a tender salmon fillet. Everything is nestled together in the puff pastry dough, and after 20 minutes in the oven ...

  9. Horn loudspeaker - Wikipedia

    en.wikipedia.org/wiki/Horn_loudspeaker

    A horn loudspeaker is a loudspeaker or loudspeaker element which uses an acoustic horn to increase the overall efficiency of the driving element(s). A common form (right) consists of a compression driver which produces sound waves with a small metal diaphragm vibrated by an electromagnet, attached to a horn, a flaring duct to conduct the sound waves to the open air.

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