Samson MLI1 User manual

MLI1 Mono Isolation Box
Quick Start Guide
Callouts
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.
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.
The Ground Lift Switch
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 [email protected].
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.
Introduction
12 3

Copyright 2018, Samson Technologies Corp. v2
Samson Technologies Corp.
278-B Duffy Ave
Hicksville, NY 11801
Phone: 1-800-3-SAMSON (1-800-372-6766)
www.samsontech.com
If you want to dispose this product, do not mix it with general household
waste. There is a separate collection system for used electronic products
in accordance with legislation that requires proper treatment, recovery
and recycling.
Private household in the 28 member states of the EU, in Switzerland and Norway
may return their used electronic products free of charge to designated collection
facilities or to a retailer (if you purchase a similar new one).
For Countries not mentioned above, please contact your local authorities for a
correct method of disposal.
By doing so you will ensure that your disposed product undergoes the necessary
treatment, recovery and recycling and thus prevent potential negative effects on the
environment and human health.
Frequency response 10 Hz – 35 kHz (±0.2 dB typical) up to75
kHz (-1 dB)
Dynamic range >140 dB
Maximum input +15 dBu @ 41 Hz for <1% THD+N
Gain +0.2 dB
Rejection 50/60 Hz 126 dB typical
Equivalent input noise -115 dBu
Intermodulation distortion 0.003%
Total harmonic distortion 0.0006%
Input impedance 7.7 kΩ
Output impedance 600 Ω nominal
Ground Lift Disconnects ground from input to output
connectors. Case is always grounded to
outputs.
Connectors Input: XLR - 1/4” combo,
Output: XLR + 1/4” TRS
Chassis Construction Powder coated, 14 gauge steel
Dimensions (L x W x D) 4.33” x 2.13” x 1.8”
110mm x 54mm x 46mm
Weight 0.7 lb / 0.32 kg
Note: All specifications are with a 50 Ω balanced source @ 1kHz, -10 dBu
and 10k load, except as noted.
At Samson, we are continually improving our products, therefore
specifications and images are subject to change without notice.
Specifications
Setup
The MLI1 can be quite useful on stage or in the studio as an interface for
connecting unbalanced audio sources to balanced sources or balanced
sources to unbalanced sources. The MLI1 can also be used to remove
hum or buzz caused by ground loops between two line-level devices.
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@samson @samsontech @samson_technologies
Having Trouble with your
MLI1 Passive Isolation Box?
We can help!
CONTACT OUR SUPPORT TEAM:
[email protected]
Our experts can help you resolve
any issues you may be having.
• Turn the volume controls of the audio system all the way down.
• Connect the audio source to XLR - 1/4” combo INPUT jack.
• Connect the OUTPUT to the input of an audio device using the 1/4”
or XLR connections.
• Raise the level of the audio system to the appropriate level.
• If you hear a hum or buzz set the GROUND LIFT switch to the LIFT
position.
Note: Inputs and outputs can be balanced or unbalanced. The MLI-1
can be used to convert unbalanced to balanced signals in either
direction.