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Purple Audio MC77 Limiting Amplifier , $1,850.00 - Add to Cart Skip to Product Information

Purple Audio MC77 Limiting Amplifier

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

Backordered - More On The Way!

We expect more from Purple Audio soon. Order today to reserve yours now, risk-free. Estimated September 3, 2026

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Purple Audio MC77 Limiting Amplifier
Backordered - More On The Way!

We expect more from Purple Audio soon. Order today to reserve yours now, risk-free. Estimated September 3, 2026

How Do You Improve On a Classic Limiting Amp?

This article was Written By

Our Product Research Team

Get to know them!

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!

Warranty Info

Sweetwater's FREE 2-Year Total Confidence Coverage Warranty

Extra peace of mind at no extra cost.

  • Save money with FREE parts and labor
  • Get back to making music with the industry's fastest turnaround time
  • Fix it the first time with our award-winning, factory-certified Service Department
Learn More about Total Confidence Coverage

Offer applies only to single-receipt qualifying purchases. Select manufacturers may require that only the manufacturer’s products qualify towards the minimum purchase amount needed to be eligible for promotional financing. Otherwise, an invoice that meets the minimum purchase amount and contains at least one qualifying manufacturer product is eligible for promotional financing. No interest will be charged on promo purchase balance, and equal monthly payments are required on promo purchase until it is paid in full. The payments equal the amount financed divided by the number of months in the promo period, rounded up to the next whole dollar. These payments may be higher than the payments that would be required if this purchase was a non-promo purchase. During the last month(s) of the promo period the required monthly payment may be reduced due to the prior months’ rounding. Regular account terms apply to non-promo purchases. New Accounts as of 07/31/2025: Purchase APR is 34.99%. Penalty APR is 39.99%. Min Interest Charge is $2. Existing cardholders: See your credit card agreement terms. Subject to credit approval.

Offer applies only to single-receipt qualifying purchases. No interest will be charged on the promo balance if you pay it off, in full, within the promo period. If you do not, interest will be charged on the promo balance from the purchase date. The required minimum monthly payments may or may not pay off the promo balance before the end of the promo period, depending on purchase amount, promo length and payment allocation. Regular account terms apply to non-promo purchases and, after promo period ends, to the promo balance. New Accounts as of 07/31/2025: Purchase APR is 34.99%. Penalty APR is 39.99%. Min Interest Charge is $2. Existing cardholders: See your credit card agreement terms. Subject to credit approval.

The estimated required monthly payment shown which excludes taxes and delivery equals the amount financed divided by the number of months in the promo period, rounded up to the next cent. During the last month(s) of the promo period the required monthly payment may be reduced due to this rounding. These payments apply only with the financing offer shown. If you make these payments by the due date each month, you should pay off this amount financed within the promo period, if it is the only balance you are paying off. If you have other balances on your account, this payment will be added to any other minimum monthly payments.

Applies only to select items from this manufacturer. Ask your Sweetwater Sales Engineer for more details.