User manual RANE DA 216A

[. . . ] When using microphones that require a "phantom" voltage, turn on the PHANTOM POWER switch, illuminating its rear panel LED. Because the phantom voltage is applied to both Inputs, don't mix phantom powered and non-phantom powered mics in the same DA 216a. Never engage the phantom voltage when using an unbalanced mic--doing so may damage the mic. If the mic is too "hot", press the INPUT GAIN switch in to reduce the gain by 20 dB. [. . . ] If an Input is selected for line-level, the Phantom Voltage is disabled for that channel, even when the PHANTOM LED is lit. 6 POWER Input connector: Use only a model RS 1 or other remote AC power supply approved by Rane. Consult the factory for replacement or substitution. Never use a power supply with your DA 216a other than the one supplied from the factory or an exact replacement obtained or approved from Rane Corporation. This unit's power supply input is designed for an AC supply, delivering 18 volts from a center-tapped transformer capable of supplying at least the current demanded by this product. Using any other type of supply may damage the product and void the warranty, which at two years (three if you send in the warranty card) parts and labor is worth safeguarding, don't you think?7 Chassis ground screws: #6-32 screws are used for chassis grounding purposes. Attach the shields of the audio cables to these points. See the Chassis Grounding note below. IMPORTANT NOTE CHASSIS GROUNDING The DA 216a is supplied with an external power supply (the RS 1). This power supply does not ground the unit to the power line ground. On the rear chassis a #6-32 screw is provided to allow for attachment of the grounding wire. This chassis ground point must be connected to earth ground either through another product, which utilizes a three-prong grounded AC power cord, or by attaching the wire to a known earth ground (such as the screw on a grounded AC outlet). Manual- DA 216a CONNECTION When connecting the DA 216a to other components in your system, leave the power supply for last. This gives you a chance to make mistakes and correct them without announcing what you did to the whole world and without damaging "downstream" equipment. Remember this when setting INPUT PAD, INPUT GAIN and PHANTOM POWER switches. These switches should never be changed in a live system. Suddenly changing the gain by 40 dB can have a profound impact on the ears of the listening audience. INPUTS The two Inputs on the DA 216a are balanced. They may also be used in an unbalanced configuration. However, if used unbalanced, do not engage Phantom Power. This cable should always be two conductors plus shield, even for unbalanced operation. If you must use shielded single conductor, keep the cable as short as possible to avoid hum or radio pick up. When connecting Inputs, use both Input terminals. [. . . ] The user may still want to turn down the OUTPUT LEVEL to avoid overloading downstream equipment. LINE-LEVEL In the LINE-level configuration, unity gain is the best place to start. Set INPUT PAD switch to LINE position (in). Set appropriate INPUT GAIN switch to 0 dB. [. . . ]