Purple Audio MC77

Class A Line-level Limiting Amplifier with All Discrete Solid-state Circuitry and Transformer-balanced XLR I/O
Purple Audio MC77 image 1
Purple Audio MC77 image 1

Or just $69/month§ for 24 months

0% interest for 24 months*. 24 equal monthly payments required. Valid through 6/25/2017. Learn more

Or make 3 easy payments of $550.00/month!

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How Do You Improve On a Classic Limiting Amp?

How do you improve on a classic? In the case of the MC77, Purple Audio began by re-creating the circuit schematic of the "E" revision of the most iconic solid-state limiting amplifier in history. Off to a great start, they then spec'd modern, high-performance components matched to the original, for a pristine all-discrete signal path. The MC77 matches the functionality and lightning-fast response time of the original, but goes further with sidechain and stereo linking functionality. Bottom line: the Purple Audio MC77 can be a major asset in your quest for better-sounding recordings.

Purple Audio MC77 Limiting Amplifier at a Glance:
  • What can the MC77 do for you?
  • Top-tier performance - and a huge value
What can the MC77 do for you?

Every studio needs a good limiter, and the Purple Audio MC77 is designed after the mother of all limiters. With its lightning-fast response time and pristine, all-discrete signal path, the MC77 is your go-to device for everything from subtle, transparent dynamics control to full-on brickwall limiting. It's fabulous on bass, kick drum, vocals, you name it. It's a must-have for punchy parallel processing on drums. The MC77 also sports a sidechain input and stereo linking - two conveniences the original didn't have.

Top-tier performance - and a huge value

At Sweetwater, we're all about performance and value, and that's what the MC77 gives you. Top-notch performance, in fact, and incredible value. At this price, you can double your value and get two. With a pair of these in your rack, you can make that stereo piano sit proud in a thick track. Punch up your toms. Strap 'em across your stereo buss for some mastering magic, and juice your mix with serious slam factor. The MC77's stereo linking makes it easy. The Purple Audio MC77. Do something nice for your studio.

Purple Audio MC77 Limiting Amplifier Features:
  • A modern re-creation of the iconic solid-state limiting amplifier
  • Discrete transistor audio path electronics
  • Single-element Class A output amplifier
  • Transformer-balanced XLR inputs and outputs
  • Zener shunt regulated audio power supply
  • Compression Ratios - 4:1, 8:1, 12:1 and 20:1
  • Fast Attack Time - 20 to 800 microseconds
  • Release Time - 50 milliseconds to 1.1 second
  • Gain of 45dB (full gain with no limiting)
  • Rugged design, with PCB stiffener and chassis mounts
  • Purple-anodized aluminum front panel
  • True Bypass via sealed relay, with front panel switch
  • Stereo linking with front panel switch
  • Sidechain insert loop/key input with front panel switch
  • Buffered VU meter can monitor input or output level at +4dBu
  • LED meter lights that don't burn out
  • Heavy-gauge black cold-rolled steel enclosure
  • 155V/230V operation (switchable from rear panel)
  • 3-year warranty
Purple Audio's MC77: put a purple classic in your rack!

Additional Media

Signal Processing Buying Guide
Spirit of the '76
In the Studio with Victor Wooten by Sweetwater Studios
Purple Audio MC77 Limiting Amp Overview by Sweetwater

Tech Specs

Number of Channels 1
Controls Input, Output, Attack, Release, Ratio (Buttons)
Ratio 4:1, 8:1, 12:1, 20:1
Side Chain Inserts Yes
Inputs 1 x XLR, 1 x TRS
Outputs 1 x XLR, 1 x TRS
Sidechain I/O Yes (With Front-panel Switch)
Rack Spaces 2U
Height 3.5"
Depth 8"
Width 19"
Manufacturer Part Number MC77

Customer Reviews

Based on 1 review
Write your review


For many years in the studio I used the UREI 1176LN. I used it on remotes also and loved how transparent it was. Now the Purple MC77 has the same magic. I was not fond of the construction quality of the 1176LN. I had to repair one on a remote right before the concert started. The build quality of the Purple is excellent. I am so glad to have this in my set of gear.
Music background: Live Sound Engineer
See also: Compressors, Purple Audio, Purple Audio Compressors / Limiters, Purple Audio Compressors / Limiters