PLA DL210NET Digi-Loop™ DSP Induction Loop Amplifier
30
OUTPUT EFFECTS
Equalizer
Hz (Bass/Mid/Treble Pole Freq)
- Sets the center frequency for the gain adjustment of each band.
dB (Pole Freq Gain Adjust)
- Adjusts the amount of gain at the pole frequency.
Metal Compensation
- Metal loss occurs when the environment contains metal that absorbs the energy from the loop, reducing the
frequency response at high frequency. This adjustment helps overcome this loss.
AGC (Automatic Gain Control)
Once the amplifier has been calibrated for the loop(s), the AGC (when active) will try to maintain that average level of signal to the loop(s)
or speaker. For people familiar with traditional AGC, this level is known as the “Target”. There is no target adjustment on the loop
amplifier since
the target is internally set by calibration
.
Level
This dial applies active gain correction up to ±20 dB around the target (the Level “window”). As the dial is turned up, more
correction is applied. If the audio level is
below
the target, up to +20dB (gain) is applied;
above
the target, up to -20dB (attenuation) is
applied.
Hold Time
is how long AGC remains at the same level when the input signal drops out of the Level Window. The Hold Time
adjustable from 1 second to 60 seconds in 1 second steps. For Voice, longer hold times are often used to maintain the gain level when
the speaker pauses or stops talking. For Music, shorter hold times are often used since the signal tends to be continuously present.
Attack
is the speed at which the gain is boosted when the level of the input signal crosses into the “Level” window. Short settings
react to the signal quickly, while long attack times have a lagging effect. When the speaker pauses, too short of an attack can result in
“pumping” or “breathing” where the sound gets really loud before returning the desired level.
Release
is the speed at which the gain is reduced after the input signal drops out of the “Level” window. Short settings drop the gain
quickly, while long release times have the effect of sustaining the signal. Too short of a release can result in missed parts of speech due
to the gain dropping off too fast. Too long of a release can result in speech getting muddled or “ringing”.
High Pass Filter
Each push of the button toggles between “OFF”, 31Hz, 62Hz, 125 Hz, 500Hz, and back to OFF.
Only use 500Hz for a speaker.
Low Pass Filter
Each push of the button toggles between “OFF”, 16kHz, 8kHz, 6.3kHz and back to OFF.
Output Delay
The output delay can be adjusted from 0 to 165ms.
Figure N: Output Effects
A465
Bass/Mid/Treble
Pole Frequency
all adjustable
20Hz - 20 kHz
Metal
Compensation
adjustable
1kHz - 9kHz
LPF toggles
between OFF,
16, 8, 6.3 kHz
Output
Delay
adjustable
0-165 ms
HPF toggles
between OFF,
31,62,125,500Hz
AGC Presets for
Music, Voice.
Custom Preset
allows adjustment
of Hold, Attack
and Release.
Custom
