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2. Hohner Pianet - Wikipedia

   en.wikipedia.org/wiki/Hohner_Pianet

   It has a black painted aluminum fascia panel below the keys. This panel also performs the key-leveling function. The keys are injection-moulded plastic. It has a transistorised pre-amplifier and amplifier and a knee lever for volume control. It plays through two small internal speakers or through an external amplifier.

3. Thiele/Small parameters - Wikipedia

   en.wikipedia.org/wiki/Thiele/Small_parameters

   A common use of Thiele/Small parameters is in designing PA system and hi-fi speaker enclosures; the TSP calculations indicate to the speaker design professionals how large a speaker cabinet will need to be and how large and long the bass reflex port (if it is used) should be.

4. 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 ...

5. List of Bose home audio products - Wikipedia

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

   From 1990 until the early 2010s, Bose sold several 2.1 channel audio systems. The systems used two small satellite speakers and a subwoofer. Early versions of the systems used an in-built CD player, followed by a DVD player. Later versions were AV receivers that used external audio sources.

6. Guitar amplifier - Wikipedia

   en.wikipedia.org/wiki/Guitar_amplifier

   The two common guitar amplifier configurations are a combination ("combo") amplifier that includes an amplifier and one or more speakers in a single cabinet, and a standalone amplifier (often called a head or amp head), which passes the amplified signal via a speaker cable to one or more external speaker cabinets. A wide range of speaker ...

7. Loudspeaker enclosure - Wikipedia

   en.wikipedia.org/wiki/Loudspeaker_enclosure

   A passive radiator speaker uses a second passive driver, or drone, to produce similar low-frequency extension, or efficiency increase, or enclosure size reduction, similar to ported enclosures. Small [28] [29] and Hurlburt [30] have published the results of research into the analysis and design of passive-radiator loudspeaker systems. The ...