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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.
Larger multiples will usually be series/parallel to maintain an impedance of 4 to 8 ohms. Many cabinets contain parallel input/outputs on the rear panel, so that one speaker cab can be plugged into the amp head, and then a second cabinet can be plugged into the first cabinet; as this "daisy-chaining" approach is wired in parallel, plugging in a ...
Two 8 ohm speakers wired in parallel have 4-ohm impedance. Guitarists who connect multiple cabinets to an amplifier must consider the amp's minimum impedance. Parallel vs. series also affects tone and sound. Speakers wired in parallel slightly dampen[s] and restrain[s] them, giving what some describe as tighter response and smoother breakup ...
40 watts into 4×10" 8-Ohm Jensen, Oxford, or JBL, or CTS speakers (wired in parallel for 2 Ohms) Silverface models : 45 watts (power increased to 70 watts in 1977 and a solid state rectifier added. There are known as the "ultralinear" models with different transformers.
The output was 50 watts at 8 ohms into a single 12 inch speaker, with a "Tone Ring" baffle in the speaker cabinet. In early 1961, model 6G6-A was introduced with a solid state rectifier replacing the GZ34, and two 12" speakers with a conventional baffle in a slightly larger cabinet (wired in parallel) with a 4-ohm output.
It is 100 watts and also has a switch for a Low Power (25 Watt) mode. The amplifier features two 12 inch Eminence special design loudspeakers, 3 speaker output sockets (Series, Main and Parallel) and an output impedance switch for 4, 8, 16 ohms (Main is 16 ohms). This model is referred to as the "Evil Twin". [14]