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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. Multi-room audio - Wikipedia

   en.wikipedia.org/wiki/Multi-room_audio

   More commonly, commercial systems are employed to accomplish these tasks. Some systems distribute digital audio over Cat5 cable to amplifiers installed in each zone. Others have all equipment centralized and distribute speaker-level audio from the "headend" equipment location. Manufacturers of such equipment include NuVo and Zon.

4. Lab Gruppen - Wikipedia

   en.wikipedia.org/wiki/Lab_Gruppen

   The E Series was the first amplifier range with more than 200 W per channel that got the Energy Star approval when it was launched in 2011. More amplifiers with Energy Star were added with the LUCIA models in 2013. In 2014, Lab.gruppen launched D Series for installations with audio over the network and PLM+, a successor to PLM Series.

5. Public address system - Wikipedia

   en.wikipedia.org/wiki/Public_address_system

   The preamplified signals then pass into the amplifiers. Depending on local practices, these amplifiers usually amplify the audio signals to 50 V, 70 V, or 100 V speaker line level. [16] Control equipment monitors the amplifiers and speaker lines for faults before it reaches the loudspeakers.

6. Bridged and paralleled amplifiers - Wikipedia

   en.wikipedia.org/wiki/Bridged_and_paralleled...

   A bridge-tied load (BTL), also known as bridged transformerless and bridged mono, is an output configuration for audio amplifiers, a form of impedance bridging used mainly in professional audio & car applications. [1] The two channels of a stereo amplifier are fed the same monaural audio signal, with one channel's electrical polarity reversed.

7. Threshold Audio - Wikipedia

   en.wikipedia.org/wiki/Threshold_Audio

   Threshold Audio is a high-end audio equipment manufacturer originally established in California in 1974 by audio engineer Nelson Pass and graphic designer René Besne. The company, today based in Houston Texas, manufactures mono-block and stereo power amplifiers, multi-channel power amplifiers and stereo control amplifiers.