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A guitar speaker isolation cabinet is a sound-proof enclosure that surrounds the speaker and sound-capturing microphone and prevents sound leakage into the outside environment, enabling the amplifier to be turned up without excessive listening volume. An amplifier at full volume is extremely loud, posing a risk to hearing and an annoyance to neighbors, and will often drown out other instruments in a mix. The characteristic sound of a tube guitar amplifier as heard on the majority of professional recordings is achieved by playing the amplifier at high volumes, and using one or more microphones to capture the sound. Turning the volume up causes the pre-amplifier to drive the power amplifier into distortion and the loudspeaker to "break up", adding distortion to the amplified tone. The speaker cone also generates more sound pressure, delivering more dynamic range and detail to the microphone. ==Sizes and types== A guitar speaker ''isolation cabinet'' has a built-in mounting baffle for a guitar speaker and a permanently mounted microphone clip. A compact isolation cabinet contains a small guitar speaker such as 6½" diameter and sometimes an attached power attenuator to prevent blowing the speaker. A guitar speaker ''isolation box'' is large enough to contain a standard guitar speaker cabinet such as a 1x12" or 2x12" cabinet and a couple of compact microphone stands. Inexpensive but less effective implementations of this approach are to bury a guitar speaker and microphone in a closet, place gobo partitions around a speaker cabinet to somewhat deflect the sound, or form a tent with multiple layers of heavy blankets over a guitar speaker cabinet and microphone. An ''isolation booth'' is a small room large enough to contain a single performer along with a rig, enabling the instrument to interact with the amplifier while isolating the rest of the band from the extreme volume. Finally, the ''live room'' of a recording studio provides sound isolation between an entire band and the control room, allowing the studio engineers to work at manageable volumes and prevent ear fatigue. The frequency response of an isolation system depends on the number of microphones, the type of microphones, microphone positioning, cabinet dimensions, speaker size, speaker model, and the amount of sound-absorption material inside the speaker cabinet. To control the resulting response, a dedicated equalizer can be used to enhance or reduce specific frequency ranges. The small room of an isolation cabinet does not produce audible room reverb, so that for recordings in general the "flannelly" sound has to be enhanced with an electronic reverb. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Isolation cabinet (guitar)」の詳細全文を読む スポンサード リンク
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