Spectra V610 Operation Manual Download Page 5

 

 
 
Compression and Limiting Simultaneously

 

 
Both compression and limiting of audio program material whereby dynamic range can be maximized as well as elimination of audio 
program peaks. 
-The gain reduction, LED meter Vu meter indicates gain reduction. At this input level, the “threshold” LED will be illuminated 
intermittently and not occasionally flicker.  
 
-The amount of compression will be determined by the input level control setting. A visual representation, using the Gain reduction 
LED meter indication should be readily apparent. 
 
-This mode is used whenever a small to intermediate amount of compression is desired. 

 
Compression Only

 

 
When the average level of the input signal to the V610 is continually above the full illumination "threshold" level, then compression 
only occurs. 
 
- Under this mode only “GR”, gain reduction occurs, (under this condition, longer release times are recommended.)   
 

Output Level Control 

 
The V610 utilizes two independent modules/circuits for audio signal compression and gain. 
The compressor limiter function is controlled by the Model 601 Complimiter module. 
 
The output control is a stepped, 24 position detent switch that is calibrated for log operation starting at 2db increments. It is important 
that the user understands the relationship between input level, (gain), and output level, (make up gain). 
 
Improper level adjustment can result in loss of dynamic range and possibly increased system distortion. 
 
The V610 Complimiter has a gain of 65dB. Of the total, approximately 40dB of gain is provided by the second, 110A amplifier 
module. 
 
The sole purpose of the 110A module is to make-up gain for the unit. The output knob of the 610 controls the 110A module gain. If 
the input gain is set at -40dBu as described earlier, then the amount of undistorted gain available is 65dB with 1.1-1 compression. This 
is referenced at+24dBu maximum output, and indicated via the red overload indicator on the M610. Decreases in gain will result as 
compression is increased. 

 
Threshold 

 
A flashing LED indicates transients, (peaks), at -40dBu and below. A constant LED indicates -40dBu and above for program material. 
The threshold circuit operates at high frequencies well beyond conventional peak indicators. As a result, the V610 will indicate peak 
amplitude material without the use of a specialized measurement device. 

 
Overload Input 
 

Complimiter Circuit Input overload  

 
Overload Output 

 
The red overload indicator LED will illuminate whenever excessive input or output signal level overload, (+22 dBu), occurs. In some 
applications it is particularly desirable to utilize the overload indicator LED as a guide to obtaining additional limiting with the output 
of the Model V610 Complimiter 

Summary of Contents for V610

Page 1: ...1 Model V610 Operation Manual Contact Information 860 West Riverdale Road Suite D6 Riverdale UT 84405 801 605 8849 9 00 AM 5 00 PM MST WWW SPECTRA1964 COM...

Page 2: ...scernable as beyond the state of the art Because of extremely low noise characteristics of the design the system has a very low input level threshold of 40 dBu thus providing the greatest input sensit...

Page 3: ...o 30 dB compression with release time such that attack and release does not occur on successive peaks of the lowest frequency utilized Typically less than 5 100ths of 1 Compression Limiting Ratio Cont...

Page 4: ...control Independent Peak Limiting Compression A unique and important design feature of the V610 is to eliminate the peak transient information independent of the compression function Audio program pea...

Page 5: ...stands the relationship between input level gain and output level make up gain Improper level adjustment can result in loss of dynamic range and possibly increased system distortion The V610 Complimit...

Page 6: ...to 100 1 When the slope control is set for minimum compression the knob is set at 10 thus providing peak limiting and linear amplification of 20dBu When the slope is set for maximum compression the k...

Page 7: ...mpression only 5 Limiting and compression with additional fixed amplitude protection maximum percent modulation Through variations of these separate and distinct modes of operation innumerable audio s...

Page 8: ...s the compression curve and a continuously variable limiting curve is obtainable For positive amplitude protection a flat compression slope provides a flat limiting protection line Control Settings In...

Page 9: ...imiting Broadcast Application This mode is the same as the previous Compression and Limiting Simultaneously mode except that additional amplitude protection at a fixed level is provided by driving the...

Page 10: ...ess or de emphasis controls frequencies irrespective of whether or not transients or sibilant peaks are present The professional audio engineer is no longer in control of the final program output fro...

Page 11: ...ting fully counterclockwise the compression limiting curve is flat Hence the maximum amplitude output is held to a constant 20 dBu for any input level up to 30 dB above threshold This extremely flat s...

Page 12: ...r multiple source program material main program channel material mastering or very slow music from a single source Minimum settings of release time 0 on the panel fully counterclockwise will quickly r...

Page 13: ...evel changes Judicious listening and selection of release times for various program selections is recommended using this information as a guide Threshold Attack Indicator LED The Vu meter needle mecha...

Page 14: ...nents EQUIPMENT WARRANTY The following warranty is effective for all Spectra Sonics LLC Manufacturer products Spectra Sonics warrants that this product is free of defects in both materials and workman...

Page 15: ...such notice the Manufacturer will give instructions respecting the shipment of product or such other matters as it elects to honor this warranty as above provided This warranty does not cover damage...

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