Peavey RHYTHM MASTER 400 - Page 2

CHANNEL INPUTS
Each channel of the Rhythm Master™ 400 has a single nigh impedance input (approximately 220K ohms)
which features extremely wide dynamic range.
CHANNEL PRE GAIN CONTROLS
Each channel features a pre gain control allowing individual volume adjustment for each instrument.
‘The pre gain control also features an integral “pull switch” which addsa significant boost (8 dB) tothe high
frequencies when activated. This high frequency boost gives a nice “edge” to clean playing styles. The boost is
activated by "pulling out” on the pre gain control and defeated by simply “pushing” the knob inward
CHANNEL EQUALIZATION
Each channel of the Rhythm Master 400 employs a system of concentric (stacked) potentiometers
consisting of three-band active equalization and reverb send controls. In each channel there are two sets of
concentric potentiometers, each serving a dual purpose. The inner ring of the first set is the low frequency
control while the outer knob is the mid control. Likewise, the second set of concentric pots are the high
frequency control (inner knob) and reverb send control (outer ring)
LOW FREQUENCY CONTROL
The low frequency control is capable of 15 dB boost or cut at 80 Hz. The action of this equalization control
is conventional and should present no problem in operation. Boost is obtained in the right-hand (clockwise)
position, while cut is obtained in the left-hand (counterclockwise) position. The vertical (12 o'clock) position
yields a flat (no boost or cut) response and is the position from which all tonal balancing should be started!
NOTE: Overboosting of the low control may cause unwanted distortion at the loudspeaker and/or
engaging the DDT™ circuit on a constant basis. This problem can be corrected by setting the
control flat (placing the control at zero) or setting the control in the minus (out) positions.
MID FREQUENCY CONTROL
The mid frequency control is capable of 15 dB boost or cut at 600 Hz with a peak/notch type of filter
response, This middle EQ circuit enables control over the vital mid-range frequencies. The action of this middle
filter is somewhat different than the high and low EQ since it is of the “peak” and “notch” type. Thiskind of filter
response is necessary to avoid undue interaction with the high and low equalizers.
CAUTION MUST BE EXERCISED IN ORDER TO AVOID OVERBOOSTING OR OVERCUTTING THE
MID-RANGE. Experience has proven that, for most applications, a vary slight mid-range cut tends to producea
tight” and well-defined sound. Generally, large amounts of mid-range boost are extremely unpleasant and
probably will never be used except for special effects.
HIGH FREQUENCY CONTROL
The high frequency control is capable of 15 dB boost or cut at 8 KHz, The boost or cut action of this control
is very similar to the low equalizer with the exception of its high frequency effect. Boost is obtained in the right
of the center position while cut is obtained in the left of the center position. Flat response is obtained in the
center (12 o'clock) position.
REVERB SEND CONTROL
The send control gets the signal level, from each channel, which is routed through the internal reverb unit,
CLOCKWISE ROTATION INCREASES THE AMOUNT OF SEND SIGNAL. NOTE: EXCESSIVE SEND LEVELS
CAN OVERLOAD THE REVERB DRIVE CIRCUITRY AND CAN CAUSE REVERB DISTORTION.
MASTER REVERB CONTROL
The master reverb control determines the desired amountof reverberation from the internal reverb system.
Clockwise rotation increases the reverb effect and counterclogkwise decreases the effect,
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center or zero position. You may encounter somesituations when audible hum and/or noise will come from the
loudspeaker. If this situation arises, position the ground switch to either positive or negative (+ or -) or untilthe
noise is minimized, NOTE: Should the noise problem continue, consult your authorized Peavey dealer, the
Poavey factory, or a qualified service technician. DO NOT, UNDER ANY CIRCUMSTANCES, REMOVE THE
GROUND PIN ON THE MAINS (POWER) CABLE!!! THE GROUND SWITCH IS NOT FUNCTIONAL ON
EXPORT MODELS,
ON/OFF SWITCH
The on/off power switch is a two postion “rocker type" and should present no problem in operation. In the
on position, a red LED indicator will illuminate showing that power is being supplied to the unit. NOTE: When
the unit is turned on, the DDT™ compression LED may momentarily illuminate. Although we recommend that
the gain controls (pre and post gain) should be at their zero position before the power switch is turned on, the
actual lighting of the DDT™ LED, in this instance, should be considered normal