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2. SWR meter - Wikipedia

   en.wikipedia.org/wiki/SWR_meter

   An SWR meter does not measure the actual impedance of a load (the resistance and reactance), but only the mismatch ratio. To measure the actual impedance requires an antenna analyzer or other similar RF measuring device. For accurate readings, the SWR meter itself must also match the line's impedance (typically 50 or 75 Ohms).

3. Wireless speaker - Wikipedia

   en.wikipedia.org/wiki/Wireless_speaker

   Recent models generally use Bluetooth 4.0 or even Bluetooth 5, and wireless speakers generally have a range of 10 meters. [4] Bluetooth devices use a radio communication frequency such that the devices do not have to be in a visual line of sight with each other. Some speakers may benefit from the NFC system to facilitate pairing with the source ...

4. Standing wave ratio - Wikipedia

   en.wikipedia.org/wiki/Standing_wave_ratio

   Checking the SWR is a standard procedure in a radio station. Although the same information could be obtained by measuring the load's impedance with an impedance analyzer (or "impedance bridge"), the SWR meter is simpler and more robust for this purpose. By measuring the magnitude of the impedance mismatch at the transmitter output it reveals ...

5. Audio system measurements - Wikipedia

   en.wikipedia.org/wiki/Audio_system_measurements

   In balanced audio systems, there are equal and opposite signals (difference-mode) in inputs, and any interference imposed on both leads will be subtracted, canceling out that interference (i.e., the common-mode). CMRR is a measure of a system's ability to ignore such interference and especially hum at its input.

6. SWR Sound Corporation - Wikipedia

   en.wikipedia.org/wiki/SWR_Sound_Corporation

   This model soon became the SM-400. SWR then pursued development of a speaker cabinet to accompany its amps. In 1986, SWR released the Goliath, a 4 x 10" full-range speaker cabinet with a built-in horn tweeter, a first for bass cabinets. The company's name was changed to SWR Sound Corporation on 1 December 1997 as part of a restructuring plan.

7. NTi Audio - Wikipedia

   en.wikipedia.org/wiki/NTi_Audio

   NTi Audio AG is a manufacturer of test and measurement instruments for acoustics, audio and vibration applications. With headquarters in Schaan, Liechtenstein, the company specializes in end-of-line audio testing for manufacturing quality control purposes, [1] provides instruments for testing public address systems in safety-critical environments [2] and also produces handheld Audio Analyzers ...

8. Antenna analyzer - Wikipedia

   en.wikipedia.org/wiki/Antenna_analyzer

   An antenna analyzer measuring SWR and complex impedance of a dummy load. MFJ-269, MFJ Enterprises Inc. An antenna analyzer or in British aerial analyser (also known as a noise bridge, RX bridge, SWR analyzer, or RF analyzer) is a device used for measuring the input impedance of antenna systems in radio electronics applications.

9. Loudspeaker measurement - Wikipedia

   en.wikipedia.org/wiki/Loudspeaker_measurement

   For a multiple sound source speaker system, the measurement should be carried out for all sound sources (woofer, bass-reflex vent, midrange speaker, tweeter...). These measurements are easy to carry out, can be done at almost any room, more punctual than in-box measurements, and predicts half-space measurements, but without directivity information.