Trinity Amps Trinity Tweed Amp Builder's Manual page 10

Bearing in mind that 6-string guitar notes don't go below 80Hz, and typical guitar speakers
cut above about 5KHz, these responses are similar. Both have a middle dip that is primarily
compensation for typical pickups' middle emphasis, rather than an obvious dip in middle
response. The Marshall circuit has this cut about an octave higher than the Fender, leaving
the low mids and bass intact for that full Marshall sound. On the other hand, Fender's tone
controls allow high-mids to pass with the treble response, and add little bass boost for the
sparkling and tight sounds they're famous for.
Here are charts each of the Fender controls. In all cases, the other two controls are left at 5.
For example, the treble chart shows he effect of varying Treble from 0 to 10, with Bass and
Middle both at 5. Notice that all controls have a wide range of adjustment, and that the bass
control has most effect from 0 to about 3. Anyone's who has used a Fender will know this,
and this control could easily be replaced by a control with a stronger logarithmic taper to
smooth this out without changing the range of available tones.
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