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Multi-amp guitar rigs
Multi-amp guitar rigs use two or more amplifiers to create a unique tone that could not be achieved with the use of only one amplifier. Guitar players such as James Valentine (Maroon 5) and John Mayer use multiple amplifiers simultaneously to achieve their tones. Session guitar players such as Brent Mason often bring four or more amplifiers to recording sessions. There are many different types of guitar amplifiers that have drastically different sounds. There are three classic guitar amplifier circuits that most amplifiers are based on that all use different power amplifier tubes: The EL84 powered class A circuits which comes from the Vox AC30 and AC15 amplifiers, The 6L6 and 6V6 powered class AB circuits which come from Fender amplifiers, and the EL34 powered class AB circuits which come from Marshall amplifiers. The sonic characteristics of these different amplifier configurations are extremely different and for a lot of guitar players it is important to have the tonal palette of all three. This is especially true for studio guitarists and is why a lot of high-end recording studios have multiple different types of guitar amplifiers in house. It is a common practice to use a 6L6 or 6V6 powered amplifier for a clear, clean tone in conjunction with an EL34 or EL84 powered amplifier for a more distorted tone. It is then a matter of blending the two amps' signals in order to achieve the desired amount of distortion.
== Use of Effects with Multiple Amplifiers ==
The use of effects with multiple guitar amps is a common way to achieve a "bigger-sounding" tone. One of the most common and easiest ways to achieve this is through the use of a stereo delay unit. The guitar's signal enters the delay unit and gets split into two signals. One signal will usually be kept dry and go to one amplifier while the other signal will be delayed be a specific amount of time depending on the tempo of the song and go to the other amplifier. This creates a much bigger sounding guitar tone than just one mono delay feeding one amplifier. Oftentimes in the studio, dry and wet signals will be panned left and right in the mix to create a better stereo image. This can be heard on a lot of Coldplay recordings. Other common effects that are used with multi-amp rigs are stereo reverbs. Stereo reverbs are often used with two of the same amp. The advantage of using effects with multiple guitar amplifiers is that one can amplify a dry signal while another amplifies a wet signal with effects and the two signals can be blended in parallel. A lot of guitar effects don't feature any kind of mix function so using two amplifiers allows the user to dial in the amount of effects being heard.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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