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2. Rotary woofer - Wikipedia

   en.wikipedia.org/wiki/Rotary_woofer

   A rotary woofer is a subwoofer-style loudspeaker which reproduces very low frequency content by using a conventional speaker voice coil's motion to change the pitch (angle) of the blades of an impeller rotating at a constant speed. The pitch of the fan blades is controlled by the audio signal presented to the voice coil, and is able to swing ...

3. Subwoofer - Wikipedia

   en.wikipedia.org/wiki/Subwoofer

   From about 1900 to the 1950s, the "lowest frequency in practical use" in recordings, broadcasting and music playback was 100 Hz. [9] When sound was developed for motion pictures, the basic RCA sound system was a single 8-inch (20 cm) speaker mounted in straight horn, an approach which was deemed unsatisfactory by Hollywood decisionmakers, who hired Western Electric engineers to develop a ...

4. List of indoor arenas in Europe - Wikipedia

   en.wikipedia.org/wiki/List_of_indoor_arenas_in...

   Arena Capacity First proposed Location Country Hala Narodowa 22,000 [45] 2014 Warsaw Poland: Wien Holding-Arena 20,000 [46] [47] 2020 Vienna Austria: Arena Polivalentă 20,000 [48] 2019 Bucharest Romania: Munich Arena 20,000 [49] 2022 Munich Germany: Suvilahti Arena: 17,000 [50] 2023 Helsinki Finland: Arena 3.3 17,000 [51] 2023 Vantaa: YTL ...

5. These Cyber Monday deals are cheaper at Walmart than Amazon - AOL

   www.aol.com/lifestyle/cyber-monday-deals-cheaper...

   READ MORE: All of the best early Cyber Monday deals to shop today Take, for example, this cordless Dyson V8 vacuum : It's just $250 at Walmart, but the same model would set you back over $320 at ...

6. Shop the best under-$50 clothing items to grab right ... - AOL

   www.aol.com/lifestyle/shop-the-best-under-50...

   This sweater and wide-leg pant set looks way more high-end than the price suggests. The slouchy oversized silhouette is the perfect comfy, ready-for-a-cozy-day-at-home fit.

7. The O2 Arena - Wikipedia

   en.wikipedia.org/wiki/The_O2_Arena

   The arena was designed to reduce echoing, a problem common among older arenas used for concerts. [8] Damage to the O2's tent, above the roof of the O2 Arena, caused by Storm Eunice (2022) On 18 February 2022 during Storm Eunice, large sections of the arena's fabric roof were shredded, causing the evacuation of 1,000 people, and the venue to close.