Whirlwind MD -1 Portable Mic Preamp / Line Driver and Headphone Monitor

A broadcast quality mic preamp performs alongside a high-performance input transformer to feed the MD-1 high-current line driver and headphone monitor amp. An input pad and level control let you adjust for almost any mic or line level signal (up to 60dB of gain). Or pass the unprocessed signal to the output (loop thru) while monitoring it with headphones.

Additional features:

• A separate balanced line level Aux input to the headphone amp for monitoring a program mix, a console foldback or a director's cues
• Headphone volume control and a separate MIX control allow you to adjust the headphone balance between the mic driver section and Aux input
• Built-in 18V phantom power (switchable)
• Steel case with belt clip resists abuse
• Two alkaline 9V batteries are mounted in slide out trays for easy access

Specifications

Input Impedance: 
   Mic Mode: 1.5k Ohms 
   Line Mode: 10k Ohms 

Output Impedance: 
   600 Ohms 

Max Input Signal: 
   Mic Mode: -4dBm 
   Line Mode: +12dBm 

Frequency Response: 
   ±3dBm, 6Hz-25kHz 
   -2dBm @ 20Hz 
   -1dBm @ 20kHz 

Maximum Output Level: 
   +15dB into 2k Ohms 
   +26dB into 10k Ohms 
   +34dB into 100k Ohms 

Phantom Power: +18VDC 

Power Requirements: (2) 9V alkaline batteries