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Volume and Extension Cabinets

Q: How much can I really expect the volume of my combo amp to increase if I add a matching extension speaker?

A: All other things being equal, adding a cabinet — for example, adding a matching 1×12 extension cabinet to a 1×12 combo amp — will increase the volume by 3dB. It may seem more or less loud, depending on how the extension cab affects the overall tone and projection.

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