Cabsims - Cabinet Simulator (or Speaker Emulator) circuits are very useful not only at home studio, during guitar recording, night practicing using headphones, but also on the stage as an additional signal output, which can be plugged directly into the mixer's input. Cabinet simulator's job is to emulate the frequency response of a guitar amplifier's speaker cabinet, which is the last and one of the most important elements of guitar sound creation (with the exception of microphone and the listener's perception of sound).

As an electronic circuit a Cabsim is a set of active or passive filters that create a desired frequency response. In its simplest form it's a typical low pass filter with roll off at about 4-5kHz, since this is the usual bandwidth limit of a guitar speaker (-3dB roll off).