Whirlwind LM2U Level Matcher

This converter uses extremely quiet, active circuits with adjustable gain controls so that signal levels from various devices of gear can be matched.

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. This converter uses 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.

Whirlwind LM2U Level Matcher Features

• XLR, TRS mini and RCA phono jacks
• Level controls
• Active circuitry, power by Whirlwind PS24 supply (included)

• LM2U Level Matcher1
• PS24 supply1

• Frequency Response20-20 kHz at unity gain, ± .1 dBv
• Total Harmonic Distortion +noise< .0015% 20-20kHz at unity gain; < .0024% 20-20 kHz, +4 to -10 levels
• Phase Shift< 11.4 degrees 20-20 kHz; < 2 degrees 100-4 kHz
• Dynamic range95.7 dB @ .1% thd
• Total Gain40 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 20 dBv of gain -87.4 dBv 20-20 kHz
• Noise at unity gain -103.4 dBv 20-20 kHz
• Noise at 40 dBv of gain -68.1 dBv
• Power consumption 34 mA DC max.
• Stereo Separation 94 dB at 20 kHz; 110 dB at 1 kHz; 120 dB at 20 Hz