Great River MixMaster 20 Summing Mixer - Used From Great River

Much more than just a summing mixer, the MixMaster 20 is designed to be the heart of your DAW-based recording system with it's dedicated dual-preamp section, multiple monitoring controls, talkback, and full-featured 20 channel mixer with recallability via USB.

Buy Pre-owned from Sound Pure with Absolute Confidence

Sound Pure's dedication to pre-owned products is unprecedented in the industry. We are a small team of dedicated experts that buys, trades, and consigns. We are trusted by customers all over the world. Our curated collection, is thoroughly tested and inspected by some of the best in the business. Our inventory is constantly changing, ever-evolving, with some items sold before reaching the website. Looking for something specific? Have questions about this product's condition or history? Want more photos, or to simply chat with an expert who's had his hands on this actual piece? Contact us now.

Our Current Used/Vintage Collection »

Sound Pure's Consignment Program »

Luthier Certification for Used Instruments »

"Gone, Baby, Gone"

This one is sold. Don't miss the next one. Some things never even make it to the site so stay up to date on our used collection.

We get in many oddities, rare and vintage products, most of which go fast. If you're on the hunt for something specific, something unique, or something priced right, let us notify you on our used collection before the items even hit the site.

Want to know if one lands?

Notify Me

Want to discuss what's coming?

Call Us! Toll Free! 888-528-9703
Local / International (+1) 919-682-5552

Talk with a Specialist

Manufacturer's Description from Great River

The MixMaster 20 is a comprehensive analog centerpiece for your DAW based recording system. Tracking, editing, and mixing are all facilitated with this unit.

The MixMaster 20 includes four transformer coupled high gain low noise microphone preamplifiers that work with any type of microphone, ribbon, dynamic or condenser. Polarity and phantom power switching is provided on the front panel. Line and instrument duties are handled by transformer coupled input bridging amplifiers with wide gain ranges, suitable for anything from keyboards to tape machines and interface outputs. Each of the four input channels has a balanced insert point as well as four auxiliary output mix sends. Each channel may also be fed to the main stereo mix bus.

Mixing duties are handled by the four input channels plus the 16 transformerless line input channels. Each of these transformerless channels has fully controllable level and pan settings to the stereo mix bus. Mix settings can be stored and recalled via the USB port. The mixing is done passively, with the summing gain provided by transformer coupled mixing amplifiers. The balanced outputs of the mix amp are available as a patch point for the insertion of compressors, equalizers or other signal processing equipment. The return is also transformer balanced and feeds the Penny & Giles stereo fader and output line amplifier, also transformer coupled.

Control room monitoring functions are also provided. These include a versatile solo system, multiple speaker system selector and level control, mix replay monitoring and talkback. Talkback feeds the cue outputs and dims the main monitoring system to aid communications and minimize feedback.

About Manufacturer

Great River Electronics Inc. designs, manufactures, and markets superior quality professional audio products that are built to perform and capture your sound with integrity, character, and accuracy. The company has an experience base in excess of twenty years in analog and digital domains of audio processing. In addition, the company also designs industrial control systems used in commercial applications. Great River Electronics Inc. is located just southeast of the capital city St. Paul, Minnesota. Dan Kennedy, co-founder of Great River Electronics Inc., began designing microphone preamplifiers to solve noise problems associated with recording orchestral music using ribbon microphones. Intelligence, perseverance, and passion yielded product designs that are supremely quiet, clearly transparent, and extremely musical across all musical genres and tracking formats. The combination of crystal clear high-end coupled with tight, solid low-end result in precise, full sounds that realize their natural sonic positions within any mix. In addition, Dan has designed an equalizer, EQ-2NV and EQ-1NV, to complement the NV Series preamplifiers or to function as a standalone equalizer. The design philosophy at Great River Electronics Inc. has always been to utilize the minimum circuitry necessary to provide maximum sonic performance. Legendary Jensen and Sowter transformers optimized for Great River Electronics Inc. are used in all microphone preamplifiers. In addition, all units are equipped with gold plated switch contacts, operate on externally switched 110 or 220 volts, and have a standard two-year warranty with registration. These preamplifiers are widely used internationally in professional recording studios, digital project studios, and road recording rigs. The units are designed as perfect front-end additions to digital audio workstations (DAWs). Two design types of preamplifiers are currently available - Original MP Series, the clean series, and the newly developed NV Series, the vintage sound series. The Original MP Series, the MP-2 and the MP-4, are two channel and four channel units that offer the most pristine, definitive sound clarity and accuracy available today. These units have optional output transformers to isolate and balance the signal. The NV Series, featuring the MP-2NV and the ME-1NV, modernize vintage sound. Both units are tunable preamplifiers that offer the same definitive sound and solid craftsmanship as all Great River Electronics preamplifiers with the ability to 'tune that sound' a la 1970's 1073's. The equalizers, EQ-2NV (two channel) and EQ-1NV (one channel), are loosely based on the topology of vintage 1081/1083 models. The newly-designed class A, discrete single-ended amplifiers in the EQ-NV Series bring greater clarity and dynamic range to the musicality and control of the 108x models. The EQ-2NV and EQ-1NV use the same internal components and have identical and stunning sonic performance capabilities. Great River Electronics Inc. understands the needs, demands, and mission of today's busy recording professionals - produce great music with great sounds and great performances accurately articulated and meticulously defined every time.

Great River Electronics Mic Preamps: MP-1NV, MP-2NV, MP-500NV - Quick n' Dirty

Great River has taken a familiar design and in a lot of ways improved upon it. When it comes to sound, the often unwieldy low-mids that a classic 1073 (or 1073 clone) will tend to have is much tighter and punchier with the Great River preamp. These preamps are available for SoundPure's Try-Before-You-Buy Program, so if you want to hear how they sound in your studio with your gear, shoot us an email at ProAudio@SoundPure.com, or give us a call anytime at 919.682.5552. Thanks for watching!