Soundstream Technologies HRU. 2 User Manual

The  input  level  is  adjusted  by  means  of  the  input  level  control  located  on  the
control panel of the amplifier. This is a unique dual-stage circuit that adjusts both
level  and  gain.  This  topology  maintains  better  S/N  Ratio  even  when  using
sources with minimal output.

In  the  ideal  situation,  all  components  in  the  audio  system  reach  maximum
undistorted output at the same time. If you send a distorted signal to an amplifier,
it is simply going to amplify the distorted input. By setting all components to reach
clipping at the same time, you can maximize the output of your system. For the
Human Reign Unleashed amplifiers, follow these steps for setting the input levels:

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1. Turn the amplifier’s input level to minimum position (counter-clockwise).
2. Set the source unit volume to approximately 3/4 of full volume.
3. While playing dynamic source material, slowly increase the amplifier’s input 
    level until a near maximum undistorted level is heard in the system. 
4. If Possible, use a volt meter & measure the A/C voltage out of the RCAs with 
    a sine wave. Then adjust the input level accordingly for true level matching.