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2. Electrical characteristics of dynamic loudspeakers - Wikipedia

   en.wikipedia.org/wiki/Electrical_characteristics...

   Sixteen ohm drivers (or loudspeakers systems) would be connected to the 16-ohm tap, 8 ohm to the 8 ohm tap, etc. This is significant since the ratio between the loudspeaker impedance and the amplifier's impedance at a particular frequency provides damping (i.e., energy absorption) for the back EMF generated by a driver.

3. Loudspeaker - Wikipedia

   en.wikipedia.org/wiki/Loudspeaker

   A horn-loaded speaker can have a sensitivity as high as 110 dB at 2.83 volts (1 watt at 8 ohms) at 1 meter. This is a hundredfold increase in output compared to a speaker rated at 90 dB sensitivity and is invaluable in applications where high sound levels are required or amplifier power is limited.

4. Damping factor - Wikipedia

   en.wikipedia.org/wiki/Damping_factor

   However, some speakers require an amplifier with a low damping factor to reproduce rich, full-bodied sound. The E-202 has a Speaker Damping Control which permits choice of three damping factors and induces maximum potential performance from any speaker. Damping factor with an 8 Ω load becomes more than 50 when this control is set to NORMAL ...

5. Line level - Wikipedia

   en.wikipedia.org/wiki/Line_level

   Such loads are around 1/1000 the impedance a line out is designed to drive, so the line out is usually not designed to source the current that would be drawn by a 4 to 8 ohm load at normal line out signal voltages. The result will be very weak sound from the speaker and possibly a damaged line out circuit.

6. Thiele/Small parameters - Wikipedia

   en.wikipedia.org/wiki/Thiele/Small_parameters

   The sound pressure, in dB, produced by a speaker in response to a specified stimulus. Usually this is specified at an input of 1 watt or 2.83 volts (2.83 volts = 1 watt into an 8-ohm load) at a distance of one metre.

7. NAD 3020 - Wikipedia

   en.wikipedia.org/wiki/NAD_3020

   The amplifier's main appeal was its inherent musicality, its ability to drive difficult speaker loads, and to allow audiophile grade source components to excel. [2] [3] Launching the product in the US at the Consumer Electronics Show, the company wired up a battery of loudspeakers in a way which presented an impedance of 1.1 ohm, and the ...