Carr Rambler Amp Manuel d'utilisateur télécharger pdf (Page 2)

INPUT DRIVE – Also known as Drive, Volume, Gain, etc. It is the knob closest

to the input jack. In many cases it has a bright cap so the frequency response

will be dependent on the knob position. As the gain increases the tone shifts

from a treble and upper mid emphasis to a bass and lower mid emphasis. On

jumpered amps, this setting’s label changes to TREBLE DRIVE.

OVERDRIVE – A second drive control for some amp models. It does not have a

bright cap so it only aects the gain. Set Overdrive to 8.00 to get the identical

response to pre-v10.10 rmware for models that have Overdrive. On jumpered

amps, this setting’s label changes to NORMAL DRIVE.

INPUT TRIM – A clean, linear gain applied at the input to the amp block that

adjusts the relative gain of the preamp. (This is analogous to changing the type

of tube for V1 in an actual amp.) It does the same thing as the BOOST switch,

the dierence being that you can control how much is boosted or cut (+/-20

dB). As a rule of thumb, every 2x multiplier equals +6dB boost. In other words,

Input Trim at 4.0 produces a +12dB boost. Input Trim should be set to 1.00 if

you want to match the actual amp.

BOOST – Toggles the input boost for an additional 12 dB of input gain. Enabling

Boost sometimes works better than turning up preamp gain.

CUT – Reduces the amount of low frequencies into the amp. This can be used

to achieve a tighter tone or to reduce low-end “ub”. This is similar to increasing

LOW CUT (Tone page) while still retaining some low end so it doesn’t get thin.

Provides an easy way to cut the overpowering bass in models such as Recto,

Splawn Nitro, Komet and others.

FAT – Emphasizes midrange “body” by shifting down the tone stack center

frequency. Specically, it multiplies the tone stack treble capacitor by four.

Depending upon the type of tone stack, tone control settings, position, etc., the

eect can be more or less noticeable. (See TONE page.)

BRIGHT SWITCH – A “treble peaker” which functions mainly to compensate for

the loss of highs at low amp volume. The eect may be subtle or pronounced,

depending on the amp selected, and it is also aected by the BRIGHT CAP.

DYNAMIC PRESENCE – Models the output transformer leakage inductance that

results in a brightening of the tone when the power amp is pushed. Increasing

this value results in a brighter response as the virtual power amp is pushed.

When playing softly or at lower gains, the inuence of this control is lessened.

Note that this only aects the power amp modeling and is dependent on

the degree of power amp overdrive. This control can also be set negative to

cause the tone to darken when playing hard. This control can also be used

to help “dial in” the sweet spot of an amp model. As the MV is increased an

amp becomes more liquid, compressed and easier to play. However, the

highs may get overly compressed causing the amp to sound too dark. The

Dynamic Presence control allows you to get the desired power amp drive and

liquid feeling and then bring the highs back without aecting the rest of the

spectrum.

DYNAMIC DEPTH – Analogous to the Dynamic Presence control, this increases

or decreases low frequencies when the virtual amp is being pushed. While real

amps don’t display this behavior, it is a valuable tone-shaping tool.

MASTER VOL TRIM – Can be used to increase (or decrease) the Master Volume

for non-MV amps. If MV is 10 and you set MV Trim to 2.0 then the MV will be 20.

Amp Block

You can also adjust preamp gain globally with GLOBAL AMP GAIN, which

aects every amp and preset. One reason you might do this is to compensate

for the gain dierence when switching to a hotter/ quieter guitar.

On the Axe-Fx unit: GLOBAL button > CONFIG > AMP GAIN

DYNAMIC PRESENCE/DEPTH are distortion-sensitive. The more the waveform

distorts (the harder you play) the more pronounced the depth or presence

boost/cut. If you play lightly (assuming you aren’t using stupid amounts

of gain) the controls won’t seem to do much. As you play harder the eect

becomes greater.

MASTER VOLUME defaults to 10 for non-master volume (vintage) amps. If

you want more MV on non-MV amps, increase MASTER VOL TRIM.

Most MV amps achieve full volume between 2-4. Further increase

compresses the bass and treble, thereby adding mids. (Bass and treble are

boosted by the speaker impedance curve, so they clip earlier.) The sweet

spot is that point at which the power amp starts to compress. If you want

a more “open” sound, be careful not to set the MV too high. You can also

lower XFORMER MATCH (a little goes a long way). You can increase LEVEL to

compensate for low MV.

Cli: The way I dial in the MV is to turn it up until the amp stops getting

louder. This is the point at which the power amp is saturating heavily. Then I

back it o until I get the right amount of preamp and power amp distortion.

That’s the sweet spot where you get the tone and the dynamics. Too little MV

and it’s all preamp distortion and there’s not much dynamics. Too much MV

and the power amp is clipping too much and it can get ubby and/or harsh.

PRESENCE and DEPTH dier from BASS, TREBLE, and BRIGHT (Tone page)

in that they are applied to the power amp as opposed to the preamp. Their

eect is dependent on the amount of NEGATIVE FEEDBACK.

For most tone stacks, when you set the BASS and TREB to zero, the tone stack

becomes basically “at” and the MID becomes a volume control.

INPUT DRIVE and OVERDRIVE will have a dramatic eect on the response of

the amplier and the personality of your instrument.

TOP ROW BOTTOM ROW

PRESENCE – Decreases high frequency negative feedback in the power amp.

Increased Increase it to help sound cut through a heavy mix. Decrease it to

compensate for overly-bright amps. It is tightly coupled to speaker impedance

(HI FREQ, HI RESONANCE.)

HI CUT – On amps with no negative feedback (NEG FDBK=0), Presence is

replaced with Hi Cut, a simple high-shelf EQ at the power amp output. (Hi Cut

control is non-fuctional in Suhr models.)

DEPTH – Boosts low frequencies from the power amp by varying the negative

feedback frequency response. Amps with a xed depth circuit have a preset

value. Amps with no depth circuit default to zero (Fenders, most Marshalls, and

generally most older designs). Also called “Resonance” or “Girth” on some amps.

NOTE: Depth is non-functional on most of the USA amp models due to the

unique topology of their feedback networks.

MASTER VOLUME – Determines the amount of power amp distortion. As it

increases, the tone controls have less inuence on the sound. Amp models

default to a starting Master Volume setting when selected.

BASS/MID/TREB – “Passive” tone stack. Can be changed with TONESTACK TYPE.

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Carr Rambler Amp Manuel d'utilisateur Page 2

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