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→Amplifier
Since amplifiers have become synonomous with particular tones, some products may be marketed as amplifiers without being able to actually drive a speaker. They simply transform the tone of the signal but must be routed into an additional power amp to deliver performance level volume.
=== Speaker Cabinet ===
A ''speaker cabinet'' (or simply ''cabinet'') refers to a speaker enclosure designed specifically for use with guitar amplifiers. Amplifiers with the speaker cabinet built-in are called ''combo amplifiers''. The term cabinet typically applies to only those that are physically separate from the amplifier. Common cabinets are 1x12's, 2x12's, and 4x12's, which contain 1, 2, or 4 speakers respectively. The "12" refers to the size of each speaker, with 12" being the most popular choice. Occasionally, a 2x15 will be seen paired with a 4x12. Also, some cabinets may feature 10" speakers.
Cabinets can have open or closed backs, which affects their audible frequency response and resonance, as well as loudness.
=== Pedals/Effects ===