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  About Impedance  
Long recognized in technical circles, the impedance relationship between a microphone and preamp/interface affects sound greatly. Different mics and preamps/interfaces have a range of impedance values that contribute to sonic texture. It can affect warmth, sizzle, clarity, grit and many other aspects of sound. Many classic microphone and preamp combos work well together because of their impedances. By inserting the VariOhm between the mic and the preamp/interface, you now control this important relationship. Impedance values can be matched for maximum output or altered for additional tone settings for all kinds of microphones.

  Microphones Preamps Interfaces  
Neumann U87 - 200Ω
AKG 414 - 200Ω
AT4040 - 100Ω
Shure SM57 - 310Ω
Royer 121 - 300Ω

A Designs Pacifica - 1500Ω
Presonus Blue Tube - 1300Ω
UA 710 TwinFinity - 2000Ω
Millennia HV-3C - 6750Ω
Grace Design - 8100Ω
Digi 003 Rack -2000Ω
Digi Mbox2 - 9500Ω
E-MU 1616PCI - 1500Ω
Mackie Onyx 400F - 2400Ω
Presonus Firebox - 1300Ω