Samson MLI1 Quick Start Manual

Introduction
MLI1 Mono Isolation Box
The Samson MLI1 is a line-level passive isolation box designed to remove
hum and buzz caused by ground loops, or convert unbalanced to balanced
signals. The premium circuitry with a flat frequency response from 10
Hz – 35 kHz (±0.2dB) and durable, roadworthy construction providing
high-quality signal connection solutions for live, broadcast and studio
applications.
The MLI1 transformer delivers an extended, flat frequency response and
ultra-low distortion. The Ground Lift switch isolates the ground from the
Input and Output connections which eliminates hum caused by ground
loops.
If you have any questions or comments regarding the MLI1 Passive
Isolation Box or any other products from Samson, do not hesitate to
contact us at support@samsontech.com.
With proper care and maintenance, your MLI1 Passive Isolation Box will
operate trouble-free for many years. Should your MLI1 Passive Isolation
Box ever require servicing, a Return Authorization (RA) number must
be obtained before shipping your unit to Samson. Without this number,
the unit will not be accepted. Please visit www.samsontech.com/ra for an
RA number prior to shipping your unit. Please retain the original packing
materials and, if possible, return the unit in its original carton. If your MLI1
Passive Isolation Box was purchased outside of the United States, contact
your local distributor.
Quick Start Guide
Callouts
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1. INPUT Jack – XLR - 1/4" combo input jack for connecting line level signals. The MLI1 can
accept balanced and unbalanced connections.
2. OUTPUT Jacks – Balanced XLR and 1/4" outputs for connecting to a PA system, mixer or
recording interface. The outputs are wired in parallel so you should use only one OUT jack at a
time. The MLI1 outputs can be balanced or unbalanced connections.
3. GROUND LIFT – When the switch is in the LIFT position, the input ground (shield) is
disconnected between the INPUT and OUTPUT jacks. When the switch is in the GROUND
position, the ground is connected through the INPUT and OUTPUT jacks.
The Ground Lift Switch
If you have two pieces of equipment in a sound system connected to ground through different
AC mains, it can cause a ground loop, which is an annoying 50 Hz or 60 Hz (depending on your
location) hum noise. When the Ground Lift switch on the MLI1 is set to the LIFT position, it breaks
the ground connection between the input and output audio jacks, thereby isolating the output from
the input and removing the hum from an audio signal path. Since both pieces of equipment are still
grounded to the AC mains, they are still safe to use.
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