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Buzz Audio SOC 1.1 Compressor - Used  From Other

Excellent condition unit coming from a smoke-free home studio.


Our product photos are the actual, specific serial number for sale!

This specific item was photographed by us here in Durham, North Carolina. We are a very small team dedicated to providing you the most accurate photos possible, through our obsessive focus - individually photographing nearly everything that comes through the door. Questions about what you see? Want more information, photos, or just a friendly conversation with someone that cares and who has actually had their hands on this exact item? Contact us now!

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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.
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Manufacturer's Description from Other

The use of Light Dependant Resistors (LDR) as the control element of an audio compressor was pioneered in the 1960's and we are all aware of the value placed on those famous vintage units. The SOC-1.1 was designed not to copy, but to take that signature and improve on it by offering the user more control. With 4 ratio settings, 3 attack options and 6 release times, the SOC-1.1 puts you in command of the dynamics rather than dealing with set parameters.

The design of the SOC-1.1 back in 1993 lead to the development of our Differential Drive Side Chain circuit which is unique to Buzz Audio and is used in all our optical compressors. This circuit processes the negative and positive portions of the audio wavefrom separately (attack and release parameters) and drives a custom four way LED/LDR gain reduction element. This process creates a very smooth coherent compression characteristic. The SOC-1.1 is perfect for recording vocals, acoustic instruments and is really cool on bass guitar. On the mix buss the SOC will provide instant glue and will never dig holes in your tracks.

One of the short comings of the LDR is it can be sluggish to respond to changes in light and therefore the attack time of an optical compressor can be quite slow. However, our side chain design incorporates a clever little circuit to speed up this reaction time resulting in an attack time of less than 1mS in fast mode. This, along with the release and ratio controls, makes the SOC-1.1 a lot more versatile than vintage compressors with fixed attack and release timings.

Channel Controls

  • Drive - variable pot that sets the amount of compression
  • Output dB - variable pot that adds gain at the output to correct for lost level
  • Attack - toggle switch with 3 settings including an excellent AUTO mode
  • Ratio - rotary switch with 4 settings for depth of compression
  • Release - rotary switch with 6 recovery time settings including a suberb AUTO mode
  • Meter - monitor input or output level or amount of compression on the VU meter
  • Bypass - hard wire unit bypass to compare compressed and uncompressed signals 

There is also a handy power on/off switch and a channel A/B link switch which is useful when the SOC-1.1 is used on stereo mixes.

Other (Miscellanous Used/Vintage/Consign)

About Manufacturer

Here at Sound Pure we hand-select used and vintage pieces of gear for our inventory. Our used selection always reflects the high standards of quality and craftsmanship that we expect from all of our manufacturers.   We are a small team of dedicated experts, located in Durham, NC.  We buy, trade, and consign instruments that we truly believe in.  Because of this, we have developed a reputation of quality and trust with our customers, located all over the world.   Our best customers are the ones that truly understand our personal touch and commitment to everything we sell, and range from hobbyists and enthusiasts to some of the biggest names in the business.  Our passion bridges the products we love with the real relationships we develop with our customer - whether they are a lifelong musician, or they are just getting started on their musical journey but care about value, quality, and being treated right.  

We vigorously test everything we take in to ensure authenticity, functionality, and reliability.  We are supported by one of the most well-respected luthiers in the Southeast, guaranteeing products that come in are thoroughly vetted, and that products that go out our in premium, performance- ready shape.   We are so confident in our ability to provide the highest quality music equipment in the industry, we even invented our “Try Before You Buy” program where we can ship out a product before collecting actual payment. 

Sound Pure's 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 of gear?  It is truly our pleasure to talk with our customers, please do contact us now.  


Max Input/Output Level; +23.5dBu (measured with 2k ohm load and 0dB output gain makeup)

Frequency Response; 4Hz to 250kHz (-3dB points with no gain reduction)|

Slew Rate; 20V/uS

Harmonic Distortion;less than 0.008% (measured 100Hz to 10kHz with no gain reduction)

Harmonic Distortion; less than 0.03% (measured 100Hz to 10kHz with 20dB gain reduction, Atk-AUTO, Rel-16)

Residual Output Noise = typically -90dBu, -100dBu A wtg (0dB output gain makeup, 150R source impedance)

Channel to Channel Crosstalk = below noise

Standard Operating Level = +4dBu = 0 VU meter display

Size = 2 Unit 19" rack mount, (482Wx88Hx250D)

Power requirements = 230V/115V selectable on rear, IEC detachable power cable

0dBu reference = 0.775 volts RMS.


Specifications are typical of a production unit and are subject to change without notice. 






SOC 1.1 User Manual