QSC Audio ISIS 215PCM user manual Adjusting the Gain Settings of the Amplifiers

PREPARATION FOR FIRST USE- Amplifier Gain Controls

Adjusting the Gain Settings of the Amplifiers

Ordinarily, the Gain controls of the amplifiers are left set at full gain. This is not recommended for first-time users of freely- configurable DSP. Freely configurable DSP, while being the most flexible and desirable, will do precisely what the user configures it to do. This may not be the expected, desired result and could damage your speakers or hearing. For this reason, QSC recom- mends the initial “learning” sessions with the 215PCM be carried out with the amplifier Gain controls set at their minimum useful settings.

Each of the two cooling air exhaust vents (one on each end of the cabinet) has two small, rectangular openings for adjusting the Gain controls. The exhaust vent closest the wheels has the access holes for the Subwoofer amplifier. The exhaust vent closest the handles has the access holes for the Top Box Amplifier.

Below, the illustration shows the location of the Subwoofer amplifier’s gain adjustment access holes. The Top Box amplifier’s access holes are on the vent located on the other end of the cabinet (left, as viewed). The access holes are not labeled. This is to discourage gain tampering after the 215PCM is set up. Use a 6- inch #1 flat blade screwdriver or similar tool. Fiberglass-shaft TV adjustment tools work well, are nonconductive, and won’t scratch equipment easily. Use a flashlight to aid in locating the gain control.

Gain control adjustment access holes (Sub- woofer amplifier shown). The lower hole accesses CH1’s gain control. CH2’s gain control has no effect because the Subwoofer amplifier is configured in bridge mono mode at the factory. Access is available for CH2’s gain control for users that modify the 215PCM. Note that modifications may void warranty.

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