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2. Hearing protection device - Wikipedia

   en.wikipedia.org/wiki/Hearing_protection_device

   Various earmuff hearing protectors. Sound levels of some daily activities. A hearing protection device, also known as a HPD, is an ear protection device worn in or over the ears while exposed to hazardous noise and provide hearing protection to help prevent noise-induced hearing loss.

3. Earmuffs - Wikipedia

   en.wikipedia.org/wiki/Earmuffs

   For example, if wearing an earplug with a NRR of 25 dB and an earmuff with an NRR of 20 dB, the combined protection would not be 45 dB. Instead, 5 dB should be added to the higher of the two NRRs. [26] In the preceding example, the combined earmuff and earplug NRR would be estimated at 30 dB (25 dB plus 5).

4. Earplug - Wikipedia

   en.wikipedia.org/wiki/Earplug

   Using both ear muffs (whether passive or active) and earplugs simultaneously results in maximum protection, but the efficacy of such combined protection relative to preventing permanent ear damage is inconclusive, with evidence indicating that a combined noise reduction ratio (NRR) of only 36 dB (C-weighted) is the maximum possible using ear ...

5. List of Bose home audio products - Wikipedia

   en.wikipedia.org/wiki/List_of_Bose_home_audio...

   The first 2.1 AV receiver system from Bose was the "Freestyle", which was introduced in 2002 and used S/PDIF and RCA inputs. The system used the same speakers as the 3-2-1. [9] The Freestyle was replaced by the "CineMate" in 2005, which has only RCA connectors and uses the same speakers as the 321 Series II. [10]

6. Headphones - Wikipedia

   en.wikipedia.org/wiki/Headphones

   While a loudspeaker must use a relatively large (often 15" or 18") speaker driver to reproduce low frequencies, headphones can accurately reproduce bass and sub-bass frequencies with speaker drivers only 40-50 millimeters wide (or much smaller, as is the case with in-ear monitor headphones). Headphones' impressive low-frequency performance is ...

7. Powered speakers - Wikipedia

   en.wikipedia.org/wiki/Powered_speakers

   An active full-range loudspeaker. Powered speakers, also known as self-powered speakers and active speakers, are loudspeakers that have built-in amplifiers.Powered speakers are used in a range of settings, including in sound reinforcement systems (used at live music concerts), both for the main speakers facing the audience and the monitor speakers facing the performers; by DJs performing at ...