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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.
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 ...
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.
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.
At 8 ohms, the amp could put out 65 Watts per channel RMS (90 Watts per channel RMS at 4 ohms [1]), delivering superb high fidelity sound with exceptional tone quality. Unlike many amps of this time, however, the TRM-800 was stable at lower impedances than 8 ohms; down to 4 ohms. [1]
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.
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