Spectra V610 Operation Manual Download Page 9

The compression slope does not change the threshold attack level or the threshold indication. The release 
time will determine how long the function will hold. 

Control Settings:

 Increase the input level control until the Vu meter begins to indicate compression. The 

threshold attack LED indicator will be illuminated continuously since the average signal level will now be 
above threshold. The amount of additional compression is dependent upon the input level control setting. 

When the release control is set for the shortest release time, maximum average level will be obtained 
with an increase in audio level and distortion. Longer release time will provide the smoothest action with 
minimum audio level changes, minimum distortion and average level slightly lower than the maximum. 
Adjust the output level control to obtain the level required. 

Typical Application

: This mode is used whenever a small or intermediate amount of compression is 

desired.  

Compression Only 

When the average level of the input signal to the compressor/limiter is continually above the threshold 
attack level, this mode occurs. 

Control Settings

: Increase input level until the LED gain reduction meter indicates compression. 

Generally, longer release times should be used. 

Typical Application

: Wherever a large amount of compression is required, operate in this mode. 

Limiting and Compression with Additional Output Limiting/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 output amplifier to maximum 
output, (peak clipping). 

The system provides “limiting-on-limiting,” which assures maximum power output or maximum percent 

modulation. When utilized in this manner, an external pad after the Model V 610 is needed to reduce the 
higher output level to line level. 

The red overload lamp indicator is set to illuminate for output amplifier signals of approxi22 
dBu, well in advance of the actual output amplifier limiting of +18 dBu or greater. Under normal 

circumstances, this is the preferred operation. However, additional precise laboratory lamp indication at 
the point of output amplifier limiting may be preferred. Calibration of the overload light for this function 
is available at a nominal charge from the factory. 

Control Settings

: Set the controls in the same manner as described in the previous “Compression and 

Limiting Simultaneously” mode except that the output level control should be set so the red overload 
lamp begins to flash. Thus, a final fixed amplitude protection line is provided to prevent subsequent 
overload distortion, over-modulation, etc. 

Typical Applications

: This mode is particularly applicable to broadcast applications where a maximum 

percentage of modulation is required. A resistance in series, (e.g. 600 ohms, 1000 ohms potentiometer, 

etc.) where signal output is sufficient to pad the signal positive down to st8 dBm broadcast line 

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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