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2. Bridged and paralleled amplifiers - Wikipedia

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

   For example, if two identical amplifiers (each rated for operation into 4 ohm) are paralleled into a 4 ohm load, each amplifier sees an equivalent of 8 ohm since the output current is now shared by both amplifiers — each amplifier supplies half the load current, and the dissipation per amplifier is halved.

3. 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.

4. Bass amplifier - Wikipedia

   en.wikipedia.org/wiki/Bass_amplifier

   The power handling capabilities of a speaker cabinet or individual speaker are always given in relation to a specific impedance (a measure of electrical resistance); the most common impedance ratings in bass speaker systems are 8 ohms and 4 ohms, although some equipment is rated down to 2 ohms or even more rarely to 1 ohm.

5. Loudspeaker - Wikipedia

   en.wikipedia.org/wiki/Loudspeaker

   The term loudspeaker may refer to individual transducers (also known as drivers) or to complete speaker systems consisting of an enclosure and one or more drivers.. To adequately and accurately reproduce a wide range of frequencies with even coverage, most loudspeaker systems employ more than one driver, particularly for higher sound pressure level (SPL) or maximum accuracy.

6. JL Audio - Wikipedia

   en.wikipedia.org/wiki/JL_Audio

   Each component subwoofer has the option of being 2-ohm, 4-ohm, or 8-ohm. The W3 series showcases the DMA optimized motor system and an elevated frame cooling. [15] The W5 Series: Higher-powered speakers that were received incredibly well when released in 1987. [citation needed] The W6 Series: Made for higher sound quality.

7. 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.