Skip to main content


We're sorry-this item is unavailable.
Contact our experts for a recommendation of great alternatives. Call us at 800-449-9128.

Play Video

A high-performance 500-series microphone preamplifier

In response to the many customer requests received over the years, the award-winning MIDAS Microphone Preamp is now available as an add-on to any mobile or recording system. When used in conjunction with the LEGEND L10 or L6 500 Series Rackmount Chassis, the MICROPHONE PREAMPLIFIER 501 provides the ideal solution for users seeking the legendary MIDAS sound in a highly-flexible, modular format that boasts significantly-upgraded, premium-quality performance. Additionally, the 501 features a separate robust DI input (through secondary rack connector) with a convenient front panel switch that lets you change effortlessly between mic and instrument inputs.

The 501’s input is electronically balanced, which provides a very clean signal—even at extremely high signal levels. However, engaging the Warm toggle switch inserts a premium-quality balanced input transformer in front of the preamp. This not only adds the benefits of galvanic isolation to the mic input, but also lowers the input impedance from 10 kΩ to 1.5 kΩ for a more vintage setup and sound. A switchable DI (Direct Injection) input is also provided for connecting instrument level signals without requiring any additional hardware.

A mic preamp of this caliber requires equally impressive I/O metering – and the 501 delivers in a big way. The high precision 31-segment rotary LED meter reads the signal post amplifi er/pre fi lter, providing input metering from -20 dBu to + 20 dBu in 1 and 2 dB steps. A similar meter is provided for output trim adjustment from -20 dBu to + 20 dBu in 1 and 2 dB steps.


  • High-performance microphone/line/DI preamplifier offers you outstanding signal integrity
  • Significantly upgraded version of the award-winning MIDAS mic amp
  • low-noise octal discrete input transistors provide incredible sonic flexibility and exceptional dynamic control
  • "Warm" feature reconfigures the input stage with a premium input transformer
  • Separate discrete transformer and electronically balanced outputs provide a splitter function

Call or click to order today.

Shop with a Friend
Free Shipping
  • Free Standard Ground shipping (48 contiguous states, some overweight and Used/Vintage items excluded).
  • Orders placed before 3 p.m. ET usually ship the same business day.
Learn More
2-Year Free Warranty on Guitars

Every guitar or bass you purchase from Musician's Friend (electric or acoustic, New or Open Box) includes two years of protection from manufacturer defects.

Contact Us for Details
We're Here for You

Our Gear Advisers are available to guide you through your entire shopping experience. Call or Chat for expert advice and to hear the latest deals.

Contact Us
Proactive Advisor Support Chat