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2. Electrical characteristics of dynamic loudspeakers - Wikipedia

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

   If a home hi-fi amplifier specifies 8 ohm or greater loads, care should be taken that loudspeakers with a lower impedance are not used, lest the amplifier be required to produce more current than it was designed to handle. Using a 4 ohm loudspeaker system on an amplifier specifying 8 ohms or greater could lead to amplifier failure.

3. Fender Hot Rod DeVille - Wikipedia

   en.wikipedia.org/wiki/Fender_Hot_Rod_DeVille

   An external speaker jack is located next to the output tubes in the back and allows the signal to be heard out of both the amplifier itself and the speakers to which it is connected (which must have a 4- or 8-Ohm impedance). The DeVille features a 60-watt valve amplifier with three 12AX7 preamp valves and two 6L6 output valves. Its circuitry ...

4. 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.

5. Wharfedale MACH - Wikipedia

   en.wikipedia.org/wiki/Wharfedale_MACH

   Impedance: 8 Ohms; Power handling: 150 Watts; Recommended amplifier power rating: 20-150 Watts; Frequency range: 48 Hz to 22 kHz (DIN45500) Frequency range (±3dB): 55 Hz to 17 kHz; Sensitivity: 94dB for 1 Watt at 1 metre (Anechoic) Computer optimized bass loading

6. Fender Champ - Wikipedia

   en.wikipedia.org/wiki/Fender_Champ

   Available as a 10" combo, features an internal 8 ohm speaker; some with output jack, some hardwired; Hand-wired eyelet fiberboard; 18 watt RMS; Controls: volume (pull for lead), treble (pull for mid boost), bass, reverb, lead level, master. 1-input, 2-channel; 1× 7025, 1× 12AT7, 1× 6C10 Triple triode Compactron and 2× 6V6; Solid-state diode ...

7. Thiele/Small parameters - Wikipedia

   en.wikipedia.org/wiki/Thiele/Small_parameters

   American EIA standard RS-299A specifies that (or DCR) should be at least 80% of the rated driver impedance, so an 8-ohm rated driver should have a DC resistance of at least 6.4 ohms, and a 4-ohm unit should measure 3.2 ohms minimum. This standard is voluntary, and many 8-ohm drivers have resistances of ≈5.5 ohms, and proportionally lower for ...