User manual M-AUDIO DMP2

[. . . ] Separate gain controls for each of the pre-amplifiers. Individual signal and clipping LEDs for each pre-amplifier channel. XLR 48v phantom power can be switched on or off for both mic inputs, with an LED indicator. Dual-purpose independent 1/4" outputs accept either tip-ring-sleeve plugs for balanced outputs or tip-sleeve plugs for unbalanced outs. [. . . ] Using a TS (tip-sleeve) 1/4" plug, the outputs will be unbalanced. Phantom Power Switch: When this button is pressed and locked to the `In' position, phantom power (48v) will be sent to both XLR In 1 and XLR In 2. High Impedance Instrument Inputs: These high impedance (100k Ohm) inputs are optimized for guitars or high impedance microphones. When an instrument is plugged into this jack, the corresponding channel's XLR input is disabled. Microphone Inputs 1 and 2: These are the balanced, low impedance microphone inputs to the pre-amp channels. NOTE: When phantom power is engaged, power is sent to the ground wire on BOTH of these channels. When an instrument is plugged into the 1/4" jacks, the corresponding XLR jack is disabled. DMP2 Operation It is conceivable that once the DMP2 is attached to your system and powered up, you will be plugging and unplugging different microphones and instruments. Follow this simple procedure, then make sure that the gain controls on the DMP2 are at their lowest levels when attaching or changing mics or instruments. Plug in the 9v "wall wart" power supply into the wall receptacle, and the other end into your DMP2 9v power jack. Make the necessary connections from the outputs of the DMP2 to the inputs of your computer sound card, mixer (use the line level inputs), or sound system's power amp. NOTE: If your target device accepts a balanced signal either on a TRS or XLR jack, use a TRS plug (tip-ringsleeve, typically a stereo plug) on the outputs of the DMP2. If your target device accepts only an unbalanced line in, then use a `TS' plug (tip-sleeve, i. e. Check the documentation of your sound card or other receiving device if you are unsure. When possible, always use the balanced outputs as this will provide a quieter and hotter signal. With all volume controls at their lowest settings, turn on your DMP2, then your sound system. 3. Setting the Gain The DMP2 provides up to 70dB of gain on the XLR inputs, and up to 50dB of gain on the high impedance inputs. Microphones and guitar pickups 4 typically emit a low signal level, requiring a "pre-amp" such as the DMP2. Other instruments, such as keyboard sound modules, may also benefit from a little bit of punch from the DMP2. Plug in your mic or instrument with the gain controls turned down, then turn the gain up incrementally while testing the mic or playing the instrument. When the signal present or "sig" LED lights fairly consistently, you've reached a good signal level for the DMP2. Some users may wish to experiment a little further to find what audibly might be referred to as a "sweet spot. " Note that when the "clip" LED lights, it is indicating a signal 2dB below clipping and above. Let your ears be the judge, but when the clip LED lights and stays lit, you are approaching distortion in your signal. NOTE: You must also consider the level that is being sent from the DMP2 to your recording device, sound card input, mixer or sound system. [. . . ] If you need to, find a primer on recording or sound reinforcement to learn more about this and the other subjects covered in this manual. 6 Specifications General Maximum Input - Mic In: Maximum Input - Instr. In: Maximum Output - Balanced: Maximum Output - Unbalanced: Headroom: Maximum Gain - Mic In: Maximum Gain - Instr. In: Clip Indicator: Low Cut Filter Cutoff: Low Cut Filter Slope: -25 dBv -5 dBv 24 dBv 10 dBv 20 dB 70 dB 50 dB 2 dB below threshold of clipping 3 dB down @ 72 Hz 18 dB/Octave Input Impedance (1 kHz) - Mic In: 3 kOhms Input Impedance (1 kHz) - Instr. In: 100 kOhms Mic Input/ Balanced Output Guitar Input/ Unbalanced Output THD (20 Hz - 20 kHz) S/N (20 Hz - 20 kHz) Frequency Response 31. 5 Hz - 80 kHz/31. 5 Hz - 25 kHz < 0. 0065% > 85 dB +/- 0. 1 dB -2. 5 dB -1 dB < 0. 0015% > 99 dB +/- 0. 1 dB -0. 75 dB -5 dB 9. 5 Hz 120 kHz Weight: Power Supply: Output Impedance: Under l lb. [. . . ]