Korg Pa4X User Manual page 685

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Modelling speaker cabinets

The accurate amp models can be paired with speaker cabinet models of the

same quality. The output stage of a tube amp works in close harmony with

the varying impedance curve of the speaker(s) it is driving. This intimate and

vital relationship plays a major role in producing the warm, punchy sound

and pleasing feel of tube amps.

Modelling a speaker cabinet is not just a case of frequency response, but is

a combination of frequency response, transient response (how a speaker

reacts to the strength of how a note is played), and the all-important interac-

tion of the amps output to the speaker's impedance curve. In addition, other

vitally important factors that have to be taken into account when modelling

a cabinet are the actual physical dimensions of the enclosure (cabinet), the

unique tonality of said enclosure (which will be affected by both the type and

thickness of the wood it is made of) and whether it boasts an open, semi-

open or closed-back design.

Amplifier types

These are the available amplifier types.

TWEED - 1x12

TWEED - 4x10

VOX AC15 manufactured in 1962

VOX AC15TB (an AC15 modified by the addition of a top boost circuit).

Normal channel of a VOX AC30TB

Brilliant channel of a VOX AC30TB

UK-manufactured vintage stack amp head

High treble channel of a UK-manufactured 100W amp head from 1969

UK-manufactured 100 Watt head from 1983

Lead channel of a 100W dual channel head

UK-manufactured 100W modern amp

High-gain amp with metal plate

1991 model 100W amp head covered in snake-skin

Overdrive channel of a high-end 100W hand made amp

Clean channel of a high-end, hand-made 100W amp

2x12 combo amp indispensable for country or blues players

Combo amp covered in tweed cloth

4x10 combo amp designed for bass guitar

Effect parameters |671

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