ADL OPUS 3 Limiter User manual

ADL OPUS 3 Limiter

Congratulations on your purchase of the ADL Opus-3 broadcast discrete
optical attenuator compressor/limiter, a close cousin to our world
famous ADL vacuum tube1000 and 1500. The Opus-3 is an all
The Opus-3 has many practical applications, allowing engineers
Opus-3
Audio Connections for Transformer Balance Systems

If used in an unbalanced system, please follow the three
steps below:
The Opus-3 operates at 48-VDC, so please be careful.

Fuse . . . . . 120-V — 220-V . . . ....0.1– Amp Slow Blow 5x20mm

The Opus-3 employs an electro-optical attenuator to achieve
transparent and smooth soft knee compression. The Opus-3 features
warmth and clarity of the Opus-3 is beneficial to everything from

Two Opus-3 limiters can either be configured as a stereo pair
or two independent mono channels. Stereo Linking: Connect both
units via a ¼” guitar cable (12” long) and switch in the up position.
For mono use, simply return both switches to the mono setting. ¼”
stereo link jacks are located on the rear panel. For accurate stereo
operation, please make sure both gain and peak reduction knobs
are positioned the same on both channels.
Allow for 10 minutes warm-up
When both channels
Attenuates the level or gain from the input XLR to the input
audio transformer by 8 dB to prevent distortion or clipping. For

If your Opus-3
the Opus-3 to compress more of the high and mid-high than the low
resistor is
resistor
Resistor

4 lbs. (boxed, 7 lbs.)
Maximum Gain Reduction...

DIAGRAM 3
Below are all parts needed for stereo linking two limiters together:
ADL stereo Rack Kit
6x 6-32 – 1/2” screws
6x #6 lock washers
6x #6 nuts
1x 1/4” guitar cable about 1/2” long, to connect between the two
units.
1. Disconnect power from both channels.
2. Remove both top covers.
3. Locate both channels so they are side by side, aligning two
side screw holes together. Add 2X 6-32 screws, attaching
both channels together, creating one unit.
4. Add ADL Stereo Rack Kit around the two channels and secure
with the last four 6-32 screws.
5. Reinstall the top covers to resume operation
POWER
FUSE
1/4”
STEREO
LINK
XLR
OUTPUT XLR
INPUT
REAR PANEL
6-32a
6-32b
6-32a
6-32b
6-32c
6-32d
6-32c
6-32d
OPUS-3 STEREO RACK KIT ASSEMBLY

Opus-3
Opus-3
Opus-3
Opus-3
The ADL Opus-3
Opus-3

DATE_____________________________________
ARTIST___________________________________
SONG____________________________________
Anthony DeMaria Labs
Opus 3 Limiter
845-594-2086
anthonydemarialabs.com
[email protected]