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AD11
Operation
- When this function is enabled, signals below "-3" on the AD11's meter are completely un-altered
(linear), and signal peaks above this level are progressively "rounded-off" in a manner similar to
analog tape saturation.
- Internally, signals that would normally reach "0dBFS" are reduced to -3dBFS, thus allowing the
AD11 to raise the average signal level by 3 dB's (for signals below the "saturation threshold"). This
also results in the peak digital output level being restored to "0dBFS." As a result, it is still possible to
"clip" the output signal if this input signal level is exceeded. In other words, the same analog input
level will result in digital "clipping;" but the average level is 3dB's louder for typical audio program.
hold (Meter Peak Hold Function)-
When enabled, the highest input signal level as displayed on the AD11's front panel meters is "held"
until it is manually reset by clicking the right SELECT switch in the set direction. The indication is a
single LED in the meter staying illuminated while the signal level varies below it. Enabling or disabling
as well as resetting this function is common to both channels.
C. GAIN SETTING
This section consists of the left and right "up/down" toggle switches and the GAIN display located
between them on the right side of the AD11 front panel. GAIN setting is always active in both Setting
and Operating modes, and changes can be made at any time within Line or Microphone range. It is
recommended that the monitor volume be lowered when changing between Line and MicPre range to
avoid possible speaker damage.
There are separate Microphone Preamplifier and Line level input circuits, and the AD11 employs
relays to switch between these input circuits. There is no compromise to the performance of the AD11
in either mode as a result. The same can be said of the "+4 /-10" level switching of the line level
inputs- employing fixed gain to raise the level of the "-10" ¼" inputs before the adjustable gain results
in excellent signal to noise performance at all line input Gain settings.
- The adjustable Gain range for Line level inputs is: 0 to 12 dB in one dB steps.
- The adjustable Gain range for Microphone inputs is: 20 to 65 dB in one dB steps.
Both GAIN up/down switches function in a similar way:
- Because the same GAIN controls are used for both Line level and Microphone inputs, there are two
different GAIN ranges. The range from 0 to 12dB is for line level inputs, and the range from 20 to
65dB is for microphones or other balanced low-level, low impedance sources.
- When the up/down switch is held in either position or "clicked" in single steps, the GAIN display will
stop changing before the GAIN is changed from 12db to 20dB, or from 20dB to12dB. The display
flashes for ~5 seconds to indicate that the operating mode will change if the gain continues to change
in the same direction. To change ranges, it is necessary to release the GAIN toggle switch, wait for
the display to stop flashing, and then press it again within ~3 seconds to transition from one range to
the other. To change the gain within the same range, press the up/down switch in the opposite
direction at any time.
- If the GAIN display is "LE" and either switch is "clicked" once, the gain setting for that channel is
displayed without change from the last (stored) setting. Similarly, if one channel's Gain setting is
displayed and the other channel's up/down switch is clicked once, the new channel's Gain setting is
displayed without change.
- Once the numerical gain setting is displayed, if the switch is clicked again, the gain will increase or
decrease by one dB. Holding the switch will result in the gain changing continuously within the Line or
Microphone range. There is an "acceleration" function so the change in gain increases in speed the
longer the switch is held.
D. OPERATING MODE- General Information
The LEVEL meters will display the peak digital level of the output of the AD11. Any changes to the
level of the analog input source or the gain of the AD11 will be reflected in the AD11's digital output
level, and thus the AD11's LEVEL meters. The meters are very accurate, and take into account every
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