White Instruments 4100 - Controls; Power On-Off; EQ In-Out; Level

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NOTE
: The EQ IN-OUT switch on the front panel does NOT switch the BI-AMP
crossover networks out of the circuit when in the OUT position; only the equalizing
portion of the Model 4100 is switched out, thus still enabling you to utilize the electronic
crossover portion of the system even though all of the equalization has been removed.
This allows you to "A-B" your bi-amped system without fear of putting low frequency
signals into delicate horns or tweeters.
CONTROLS
POWER ON-OFF:
This switch controls the power to the unit. The Model 4100 may be connected to the
switched power plugs provided on the rear of most receivers and preamplifiers. In this
manner, the POWER switch of the Model 4100 may be left in the ON position and the
unit controlled from the main switch of the system. A pilot lamp in the center of the front
panel indicates whether or not the unit is on.
EQ IN-OUT:
This switch inserts or removes the frequency shaping controls of the Model 4100 from
the system. This allows you to go from your "raw" or unequalized system to the
equalized system for comparison. This switch will not affect the bi-amp crossover
network if inserted in the rear accessory socket.
LEVEL:
The level controls are used when excessive signal levels are encountered which may
overdrive the Model 4100 or the following components in the system. By using these
calibrated attenuators which are at the input to the Model 4100, incoming signals may be
attenuated to a suitable level. These controls may also be used for balancing the system
after equalization to assure the system volume is the same in both the left and right
channels.
OVERLOAD:
These panel lamps indicate if the Model 4100 is driven by signals exceeding +16 dBm (5
volts). While the full output of the Model 4100 is +18 dBm, the indicating point of the
overload circuit is set about 2 dB below this level to warn the user he is approaching
overload conditions.
LOW CUT:
The LOW CUT controls are very important to the proper operation of your music
reproduction system. These controls vary the cutoff point of a 12 dB/octave high-pass
filter from 20 Hz to 160 Hz. By proper adjustment unwanted and distortion-causing low
frequency transients are kept from the power amplifier and speakers. (See curves in
CIRCUIT DESCRIPTION section.)