Spectra V610 Operation Manual Download Page 8

Control settings:

 For low signal levels (e.g. Microphone, etc.), no attenuation of the input signal is 

required and the threshold attack LED will occasionally flash whenever input levels are above threshold. 
For higher signal levels (e.g. Line, etc.), it is preferable to operate above the point of threshold and thus 

maximize the signal-to-noise ratio of the system. The slope control is set to approximately normal linear 
amplification (“100” slope control setting = fully clockwise), the release control setting is not critical and 
may be set at maximum time. The input level control is adjusted so the threshold attack LED is 

continually illuminated. For either of these two conditions, adjust the output level control to obtain the 
level required. 

Typical Application:

 This mode provides amplification for input signal levels below the -40 dBu 

threshold attack level, such as when normal microphone output levels, (-50dBu), are terminated directly 

to the Model V610. For higher level input signals, setting the slope control to approximately normal linear 
amplification has the practical equivalent of switching the Model V610 out of the circuit. 

Peak Limiting Only 

For all levels of the input signal waveform where peak signals are above threshold, and average 
level is below threshold, peak limiting occurs. 

Peak waveforms or transients, by definition, are high amplitude, short time-base, and are beyond the 

audible range, (20 kHz). Thus, the independent limiting function will attack, instantaneously, to provide 
complete peak overload protection. The limiting curve approximately follows 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:

 Increase the input level control until the threshold attack LED occasionally begins to 

flash, indicating peaks are beginning to cross threshold. The control setting will approximately represent 
the maximum amplitude of the peak material for this audio program selection. The maximum amount of 

peak limiting will occur just prior to the point where the VU meter begins to indicate gain reduction. The 
slope control is set for minimum, (flat), slope of the limiting, (and compression), curve (fully clockwise). 

Since compression is not being activated, the release control setting is not critical and would be set for 
maximum release time, (fully clockwise). Adjust the output level control to obtain the level required. 

Typical Application:

 Maximum Vu output without affecting dynamic range is obtained with maximum 

peak limiting. With no compression of audio program source material, no peak program material will be 
transferred through the Model V610, thus allowing improved audio level. As a result, increased 

headroom will be realized without associated “peak overload”, (typically 10dB). In addition, an 
improvement in signal to noise ratio will be achieved in proportion to the increase in signal level. 

Compression and Limiting Simultaneously 

This mode of operation occurs when the average level continually alternates above and below the 
constant threshold attack level. 

When the audio program waveform initially crosses threshold, the limiter will attack and hold until the 

compression function takes over. The cycle will repeat each time the average level crosses the threshold. 

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...

Reviews: