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50 years ago WIlliam G. Dilley introduced the world to his revolutionary new dynamics processor, the Model 610 Complimiter. A truly unique device, the Model 610 was not only the fastest, cleanest and quietest of it's type, but was also capable of providing completely separate peak-limiting and compression functions. For decades the Model 610 could be found safeguarding levels to tape, strapped across the mix bus, and even before record lathes in some of the most well known recording studios in the world. 

Today, Spectra 1964 introduces the Model C610 Complimiter. True to the original, the C610 still utilized the unchanged and still unmatched 601 Compressor/Limiter circuit, as well as a 101 amplifier for make-up gain. The improvements include XLR and Phoenix I/O, highest quality input/output transformers, selectable input padding, buffered true VU metering, and multi-stage overload indication.

From the original Spectra Sonics Model 610 brochure, ca. 1969:
“Spectra Sonics introduces the Model 610 “COMPLIMITER,” the newest proven concept in a rack-mounting compressor/limiter system with performance both measurably and audibly discernable as “beyond state of the art.”  This unit performs the functions of peak-limiting and volume-compression, either independently or simultaneously, as a direct function of the type of program input, with performance that is unequaled by most linear amplifiers.  The extremely low noise characteristics of this unique, self-contained system provide a very low threshold of -40dBm, thus allowing the greatest input sensitivity and compatibility with audio equipment and accessories used in the professional recording, broadcasting, motion picture and sound-reinforcement industries.

As the fastest of all peak-limiting devices (100 nanoseconds to 2 microseconds), peak-limiting can be employed with no audible distortion of any kind, thus allowing undistorted recordings, transmissions, etc. at average levels significantly higher than conventional “0” VU (+4dBm or +8dBm) while simultaneously providing maximum amplitude protections.  A white threshold indicating lamp provides the audio engineer – for the first time – a representation of the peak-limiting taking place without the task of monitoring an auxiliary oscilloscope.  A separate red overload indicating lamp forewarns the operator, in advance of overload, exactly when to check his control adjustments without requiring his undivided attention.  The continuously variable compression/limiting ratio assures the widest range of slope control available from 1.1:1 (approximately linear amplification) to approximately 100:1 (flat slope, maximum amplitude protection line).  Coupled with a constant threshold attack level of -40dBm, the need to continuously reset input levels during operation for each new compression/limiting ratio is eliminated.  Variable release time control allows the selection of the smoothest dynamic action commensurate with minimum distortion (typically less than 5/100ths of 1%).  The uniform frequency response of this unit negates the need for “de-ess” roll-off on all high frequencies. 

During actual listening, the absence of noise, distortion, and frequency discrimination is readily apparent.  The Model 610 “COMPLIMITER” is particularly effective in controlling sibilant sounds, restricting extreme ranges, and providing the smoothest dynamic action.”

TESTIMONIALS
“I'm hesitant to disclose to other mastering engineers what a wonderful game changer the V610 is.” - Garrett Haines

“They sound HUGE! I used the hell out of them on the new Jason Isbell record!!” - Dave Cobb

"The 610 has been my longtime 'go to' device for dirtying up drums, parallel compression, and other general 'grit enhancement' tasks. Its ability to pump and overdrive make it perfect for things like that. The 610's not-so-dirty little secret is that, with proper settings, it can also be one of the cleanest, most transparent compressors available. Unique and invaluable. A classic." - Pete Weiss

"They've been on every record I've engineered since, (1993), and most that I've mixed." - Tchad Blake

"Behind me in the rack were mounted two 610 compressors that were a perfect fit across the stereo buss. How I missed that sound. Now, it’s back!" - Jack Douglas