The Whirlwind IMP Combiner is an audio device that merges two microphone-level signals into one balanced, low-impedance output to reduce mixer input channels. It features a phase-reverse switch to correct polarity issues when combining multiple microphones on a single source . This passive unit uses a transformer for signal processing, but it cannot pass phantom power, requiring the use of dynamic or externally powered condenser microphones. Key Features and Uses -Combines Signals: The primary function is to take two mic-level inputs and combine them into a single output. -Phase Reverse Switch: This switch allows you to invert the polarity of one of the input signals, which is crucial for correcting phase problems when using two microphones to capture a single source, such as miking a drum kit from above and below. -Reduces Inputs: By combining signals, you can use fewer input channels on your mixer or audio workstation, which is useful for larger setups or when space is limited. -Uses: Combining two microphones over a single drum or guitar amp. Reducing the number of inputs needed on a soundboard. -Passive Device: The IMP Combiner is a passive unit, meaning it relies on its internal transformer and does not require external power to operate.