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Whirlwind LM2B 2-Channel Line Level Converter

BH #WHLM2B • MFR #LM2B
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Whirlwind LM2B 2-Channel Line Level Converter
Key Features
  • Converts Consumer Line to Pro Line Level
  • -10 dB to +4 dB, Unbalanced to Balanced
  • XLR, RCA, and 3.5mm TRS I/O
  • Dedicated Level Controls
The LM2B from Whirlwind is a two-channel, level matching device, housed in a compact and robust enclosure. The unit provides high quality conversion of analog audio levels and impedances between -10dBV "consumer/semi-pro" unbalanced equipment, and +4dBm balanced professional equipment.

The LM2B can amplify an unbalanced signal by up to 14dB, and sports dual, adjustable gain controls, on the front panel. Both controls are marked with positions that represent nominal conversion gain settings. The unit is powered by an included external 24VDC power supply.

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Whirlwind LM2B Overview

The LM2B from Whirlwind is a two-channel, level matching device, housed in a compact and robust enclosure. The unit provides high quality conversion of analog audio levels and impedances between -10dBV "consumer/semi-pro" unbalanced equipment, and +4dBm balanced professional equipment.

The LM2B can amplify an unbalanced signal by up to 14dB, and sports dual, adjustable gain controls, on the front panel. Both controls are marked with positions that represent nominal conversion gain settings. The unit is powered by an included external 24VDC power supply.

Two-channel, unbalanced to balanced audio line level converter
Unbalanced connections include gold plated RCAs and a stereo, 3.5mm mini connector
Balanced connectors include gold-plated XLRs
Individual gain controls for fine-tuning levels
Active circuitry, powered by an included external power supply
UPC: 692465016261

Whirlwind LM2B Specs

Frequency Response
20Hz to 20kHz, +/-0.17dBV @ unity gain
Noise Level
-100.3dBV, @ unity gain
Maximum Input Level
+18dBV
Maximum Output Level
+23dBV
Input Connectors
2 x RCA phono
1 x 1/8" TRS mini-stereo phone
Output Connectors
2 x XLR
Input Impedance
10kΩ, unbalanced
Output Impedance
100Ω, balanced
Dimensions
4.31 x 2.75 x 1.75" (109 x 70 x 45 mm)
Weight
Not specified by manufacturer
Packaging Info
Package Weight
0.99 lb
Box Dimensions (LxWxH)
9.8 x 4.35 x 3.25"

Whirlwind LM2B Reviews

Subwoofer signal boost.

By John
Rated 5 out of 5
Date: 2025-09-30

Needed to boost Subwoofer signal from a consumer AV system to a Pro amplifier input. Worked great! Does what it was designed for.

So far so good

By Cheuk Fang Rich
Rated 5 out of 5
Date: 2021-03-13

Small with great sound. Matches levels with quality.

See any errors on this page?

Is the output signal truly FULLY balanced, i.e. ...

Is the output signal truly FULLY balanced, i.e. is there both a (+) and out-of-phase (-) signal?
Asked by: William D
Yes, the outputs are fully balanced
Answered by: Whirlwind Expert
Date published: 2020-07-09
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