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* Note: A continuously illuminated peak LED indicates you have surpassed optimum input level
and distortion of the respective channels audio signal will occur. It’s time to adjust your gain
structure to a more acceptable setting. To monitor your gain structure in finer detail, take note of
the incoming level meters on the destination device that follows next in your signal chain!
4.3 Independent (2x) channel 48V phantom power and -20dB PAD selector switches
48V Phantom power switch
Each of the ADDA 192-S’s input channels feature a phantom power switch to facilitate enabling
or disabling of 48v of continuous power supply to the channel. When enabled the corresponding
phantom power LED will illuminate.
* Note: Phantom power is a voltage distribution system utilizing standard microphone cable. It is
useful (and often required) for powering condenser microphones connected to your audio
system. If any of your microphones require phantom power, simply enable the corresponding
channels phantom power switch to activate a constant 48v power supply.
-20 dB PAD switch
A -20dB PAD switch is provided for each channel to allow a twenty (20) decibel gain reduction of
the incoming signal if desired/required. When enabled the corresponding -20dB PAD LED will
illuminate.
* Note: This function is useful when connecting extremely "hot" signals. Excessive signal input
levels can overdrive the ADDA 192-S’s pre-amplifier input stage resulting in unwanted signal
distortion. The PAD switch allows -20dB of gain attenuation/reduction to compensate for this
situation prior to finer pre-amplifier gain adjustment. To monitor your gain structure in finer
detail, take note of the incoming level meters on the destination device that follows next in your
signal chain!
4.5 Analog & Digital Mix controls
The ADDA 192-S’s Mix controls allow you to mix together the
incoming analog signal/s with the output of the internal D/A
converter (any incoming digital signals connected to the rear panel)
for monitoring purposes through the analog outputs (and headphone
output).
* Note: This is a great feature when using the ADDA 192-S in a recording environment. As all
computer workstation based digital recording systems have a small amount of inherent latency,
it is important to offer functional solutions to avoid possible issues during the recording process.
Latency manifests itself as a delay between recording a signal and monitoring/hearing it. It takes
time for data to travel to and from your computer through hardware (audio card/interface) and
multiple software layers to be recorded and played back. Although developers are optimizing
their hardware and software drivers to deliver better performance in regard to reducing latency,
it still remains a problem. In many systems where latency delay is unacceptably long it becomes
almost impossible to record anything in time. What you hear is always a little bit behind what
you're playing!
Example – Imagine trying to record your vocal while listening to your backing tracks with a
noticeable delay between when you actually sing and what you are hearing back in your
headphones! Obviously this will cause you never ending problems of timing, phrasing, etc.
The ADDA 192-S allows for zero latency hardware input monitoring thus eliminating the
problems found in many systems. It allows you to simultaneously monitor your playback tracks
from your recorder/computer workstation (when connected to the digital input) whilst continuing
to monitor your live inputs (from microphone, guitar, synthesizer, etc). As the analog input
