DL107, DL207 and DL210 2.0 Digi-Loop™ DSP Induction Loop Amplifiers
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OUTPUT EFFECTS WINDOW
A465_bw
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.
Output effects can be accessed from two different places - The “FX” button in the calibration window, or the “FX” button near the output slider.
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 chosen.
Metal Compensation
- Additional parametric gain control to help overcome high-frequency loss caused by metal absorbing energy from the loop.
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
.
Presets: Music, Voice, and Custom
The presets for
Music
and
Voice
are optimized settings for AGC. If more control is desired over the AGC
parameters, or a third scenario is required, a
Custom Preset
can be created and recalled.
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 +20 dB (gain) is applied;
above
the target, up to -20 dB (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”.
Output Delay
adjusts the timing of the audio at the output. This is useful when audio needs to match video (lip sync), or when amps are
chained together in a deep venue where loop timing needs to coincide with delayed speaker arrays.
High Pass Filter
- Each push of the button toggles between “OFF”, 31 Hz, 62 Hz, 125 Hz, 500 Hz, and back to OFF. Only use 500 Hz for a speaker.
Low Pass Filter
- Each push of the button toggles between “OFF”, 16 kHz, 8 kHz, 6.3 kHz and back to OFF.
Output Delay
- can be adjusted from 0 to 165 ms.
