User manual ART DUAL LEVELAR

[. . . ] Limiting can be described as a "ceiling". When using a limiter, once the signal level reaches the threshold, it is unable to go any louder - it is limited to a desired level. In addition to making signal levels more manageable, it is common practice to apply compression or limiting to a signal to make it louder or more "in-your-face". The benefit of using the Dual Levelar for these applications is in its design. [. . . ] Upon power up you will see all the LEDs light, then turn off. This is normal and the Dual Levelar is ready for use once the LEDs have turned off. The 12ax7 tubes will reach normal operating temperature within one to three minutes. During this warm up period you may experience variations due to the THD of the tubes stabilizing. Again, this is normal and the Dual Levelar will provide consistent results once this warm up period is over. Threshold Control The Threshold control sets the point at which the Dual Levelar will act on a signal. Turning this control counterclockwise lowers the threshold (adding more compression to a signal). Turning this control clockwise raises the threshold. Setting the Threshold control is dependent on the input signal. The output from a guitar might be -20dB to -10dB, where the level from an insert on a console might be -10dB to +10dB. The easiest way to set the threshold control is to start with the control fully clockwise. Slowly turn the control counter-clockwise (lowering threshold) until you see the Threshold LED light. Now adjust the control (either lower or higher) until you have the amount of compression you desire. Active/Bypass Switch The Active/Bypass switch must be pressed "in" for the Dual Levelar to process a signal. In its "out" position, the Dual Levelar is bypassed and signal runs from the input jacks to the output jacks with no processing. Use the Active/Bypass switch when setting the Dual Levelar's output level to achieve unity (no boost or cut) gain. Unity gain is achieved when the active level is the same as the bypassed level. Limit/ Comp Switch In its "out" position, the Dual Levelar's compression ratio is an active 2. 3:1 ratio. This means that for every 2. 3dB over the threshold the input signal rises, the Dual Levelar's output will change by 1dB. This is a very mild and musical compression ratio which is ideal for smoothing all types of signals. In its "in" position, the Dual Levelar's compression ratio is greater than 6:1. This is typically called "soft limiting" as it allows only a 1dB change in signal level for any signal reaching over 6dB over the set threshold. [. . . ] email: artroch@aol. com 6 7 Warranty & Service Information Limited Warranty Warranty service for this unit will be provided by Applied Research & Technology, Inc. in accordance with the following warrant statement. (A R T) warrants to the original purchaser that this product and the components thereof will be free from defects in workmanship and materials for a period of three years from the date of purchase. will, without charge, repair or replace, at its option, defective product or component parts upon prepaid delivery to the factory service department or authorized service center, accompanied by proof of purchase date in the form of a valid sales receipt. [. . . ]