Soundstream Technologies HRU. 2 - Manual (Page 15)

LEVEL SETTING
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.