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LM2U/LM2B
whirlwind
LM2 LEVEL MATCHERS
The Whirlwind LM2 Level Matchers are unique,
high quality solutions for converting analog
audio levels and impedances between -10 dBV
“consumer” or “semi-pro” (also known as IHF
standard) unbalanced equipment and +4 dBm
balanced professional equipment. The LM2B is
the “up converter”, amplifying unbalanced IHF
signals 14dB and providing balanced output
signals. The LM2U functions in reverse, taking
balanced +4dBm professional levels, actively
attenuating them and delivering unbalanced
outputs at IHF levels. Both converters use
extremely quiet, high quality active circuits with
adjustable gain controls so that signal levels
from various devices of gear can be matched to
one another.
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LM2B
OUT
REDWHT
LEVEL
REDWHT
IN
T=W
R=R
Whirlwind USA www.whirlwindusa.com LM2B -10/+4
Balanced
Outputs
POWER
Gain
Controls
RCA
Inputs
3.5mm
TRS
Input
LM2U
WHT RED
IN
LEVEL
REDWHT
Whirlwind USA www.whirlwindusa.com LM2U +4/-10
Balanced
Inputs
POWER
Gain
Controls
Balanced connections are through gold plated XLRs.
Unbalanced connections include gold plated RCAs and
a stereo 3.5mm mini connector. The units are powered by
an external 24 VDC supply (model #PS24) which
connects in the rear of the unit above the mounting
flange. The level controls of each unit are marked at the
position that represents nominal conversion gain
settings.
RCA
Outputs
OUT
T=W
R=R
3.5mm
TRS
Output
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Frequency response
± .17 dBV 20-20kHz at unity gain
± .19 dBV 20-20kHz -10 to +4 dBV
Total harmonic distortion +noise
< .0018% 20-20kHz at unity gain
< .0023% 20-20kHz -10 to +4 levels
Phase shift
< 16.7 degrees 20-20kHz
< 3 degrees 100-4kHz
Dynamic range
117.9 dB at .1% thd, unity gain
96 dBV at –10 to +4 gain
Total gain
40 dBV
Range of level control
-40 to + 40 dBV
Maximum input level
+18 dBV
Input impedance
10K Ohms unbalanced
Maximum output level
+23 dBV
Output impedance
100 Ohms balanced
Noise at 14 dBV of gain
-92.4 dBV 20-20kHz
Noise at unity gain
-100.3 dBV 20-20kHz
Power consumption
41 mA DC max. Typical
92 mA DC max.
Stereo separation
70 dB at 20kHz, 14 dBV of gain
95 dB at 1Hz, 14 dBV of gain
123 dB at 20Hz, 14 dBV of gain
Frequency response
± .1 dBV 20-20kHz at unity gain
± .07 dBV 20-20kHz +4 to –10 dBV
Total harmonic distortion +noise
< .0015% 20-20kHz at unity gain
< .0024% 20-20kHz +4 to –10 levels
Phase shift
< 11.4 degrees 20-20kHz
< 2 degrees 100-4kHz
Dynamic range
95.7 dB at .1% thd
Total gain
40 dBV
Range of level pot
-40 to + 40 dBV
Maximum Input level
+17 dBV
Input Impedance
20K Ohms balanced
Maximum output level
+17 dBV
Output Impedance
100 ohms unbalanced
Noise at -14 dBv of gain
-105.9 dBV 20-20kHz
Noise at unity gain
-103.4 dBV 20-20kHz
Power consumption
34 mA DC max.
Stereo Separation
94 dB at 20kHz
110 dB at 1kHz
120 dB at 20Hz
LM2B SPECS
LM2U SPECS
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LM2U
+4 / -10 Level Matcher
INPUT
REDWHT
WARRANTY
This product is guaranteed to be free from defects in
materials and workmanship to the original purchaser for
a period of 2 years from the date of purchase. Should
service be required, return the unit postage prepaid
along with the original sales receipt to:
whirlwind
Attention - Repair
99 Ling Road
Rochester, New York 14612
The warranty on this product shall not apply to defects
or damage resulting from abuse, abnormal use or from
repairs or modifications performed by anyone other than
whirlwind. If it is determined a manufacturing defect has
occurred, whirlwind will repair or replace the unit at our
option and pay the postage back to you.
LEVEL
OUTPUT
REDWHT
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