![]() We can group input device impedance values into three general categories. So 100K expresses 100,000 ohms, 1M expresses one million ohms, or 1 megohm. You'll also see "K" (representing thousand) and "M" (representing million) with the numeric value. You'll see the values expressed as "ohms" or represented by the omega symbol: " ". Impedance is expressed in ohms, which is typically a measure of resistance, but impedance involves more than just resistance. This article is a brief overview that should help you understand what works with what, what doesn't, and why.īecause it can make you sound BAD, or mean that you might buy something that won't work properly with gear you already own. It's only logical that if you plug something in that doesn't match up to what the amp or preamp was designed to expect, strange and/or damaging things can happen. When your amp was designed, all the parts inside were chosen carefully, and their values and characteristics are critical to getting the results intended. ![]() When you plug a microphone, instrument, or preamplifer into the input of an amplifier, that device becomes part of the circuit. There is another FAQ that talks about impedance from the speaker, or output perspective. This article is about the INPUT side, what you plug INTO an amp. We are "Ill Ohmic Gurus"* and as such, we've broken the explanations down into two articles: Input devices such as instruments and preamps, and output devices, usually speaker cabinets or headphones.
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