Mackie Onyx 2480 Owner's Manual - Page 10

ONYX 80 SERIES Onyx 80 Series Features Channel Strips 3. Low-Cut Switch Depending on the model that you purchased, there are 24, 32, 40, or 48 channel strips. Each channel has a mic and line input connector and an insert jack for connecting an external signal processor. 1. 48V Phantom Power Switch 1 48V LINE 100Hz 30 U 20 0 40 U -20dB 60 +40dB GAIN U EQ HIGH 12 kHz -15 +15 2k FREQ 400Hz 8kHz U HIGH MID -15 +15 400 FREQ 100 2k U LOW MID -15 +15 U LOW 80 Hz -15 +15 EQ OUT IN Most professional condenser microphones require phantom power, which is a low-current DC voltage delivered to the microphone on pins 2 and 3 of the XLR microphone connector. Push in the 48V button if your microphone needs phantom power. An LED lights just above the button to indicate that phantom power is active on that channel. Dynamic microphones, like Shure's SM57 and SM58, do not require phantom power. However, phantom power will not harm most dynamic microphones should you accidentally plug one in while the phantom power is turned on. Be careful with older ribbon microphones. Check the manual for your microphone to find out for sure whether or not phantom power can damage it. Note: Be sure the MAIN MIX faders [60] are turned down when connecting microphones to the MIC Inputs, especially when phantom power is turned on, to prevent pops from getting through to the speakers. The Low-Cut switch, often referred to as a high-pass filter, cuts bass frequencies below 100 Hz at a rate of 18 dB per octave. We recommend that you use the Low-Cut filter on every microphone application except kick drum, bass guitar, bassy synth patches, or recordings of earthquakes. These aside, there isn't much down there that you want to hear, and filtering it out makes the low stuff you do want much more crisp and tasty. Not only that, but the Low-Cut filter can help reduce the possibility of feedback in live situations and it helps to conserve amplifier power. Another way to use the Low Cut filter is in combination with the LOW EQ on vocals during live performances. Many times, bass shelving EQ can really benefit voices. Trouble is, adding LOW EQ also boosts stage rumble, mic handling clunks, and breath pops. Low Cut removes all those problems so you can add LOW EQ without losing a woofer. +15 Here's what the +10 combination of LOW EQ +5 and Low Cut looks like 0 in terms of frequency -5 curves. -10 -15 20Hz 100Hz 1kHz 10kHz 20kHz Low Cut with Low EQ Boosted 4. Polarity Switch Pushing in this switch simply reverses the polarity of the signal. This provides an easy way to correct a microphone or line source whose polarity is opposite from the other microphones, either from a miswired cable or from not following the AES standard for Pin 2/Pin 3. 5. GAIN Control AUX 2. MICS/ENLDINE Switch This1button switches between the MIC and LINE in- putMsA.XWhenPREthe button is out (MIC), the XLR MIC input is used2and the LINE input is disconnected. When the button is pushed in, the 1/4" input is used and the XLR MICMAiXnputSTEiRsEOdisconnected. L R 3 If you haven't already, please read "Set the Levels" on page 5. The GAIN control adjusts the input sensitivity of the mic and line inputs. This allows the signal from the outside world to be adjusted to optimal internal operating levels. If the signal is plugged into the XLR jack, there is 0 dB of gain (unity gain) with the knob turned all the way down, ramping up to 60 dB of gain fully up. OO OO OO OO MAX PRE 10 O4NYX 80 SERIES MAX L R STEREO