Mackie Onyx 32.4-Bus Owner's Manual - Page 11

Owner's Manual 5. HIGH EQ 9. LOW MID FREQ +15 This control gives you +10 up to 15 dB boost or cut at +5 12 kHz, and is flat at the 0 center detent. Use it to -5 add sizzle to cymbals, and -10 an overall sense of trans- -15 20Hz 100Hz 1kHz High EQ parency or edge to the 10kHz 20kHz keyboards, vocals, guitar, and bacon frying. Turn it down a little to reduce sibilance, or to hide tape hiss.  This knob ranges from  100 Hz to 2 kHz and  determines the center  frequency for the LOW n MID EQ filter. This allows n you to zero in on the n precise narrow band of (Z (Z K(Z K(Z K(Z Low Mid EQ Freq Sweep frequencies you want to have affected by the LOW MID EQ. 6. HIGH MID EQ 10. LOW EQ +15 Short for "midrange," +10 this knob provides 15 dB +5 of boost or cut centered 0 at the frequency deter- -5 mined by its FREQ knob -10 (see HIGH MID FREQ -15 20Hz 100Hz 1kHz High Mid EQ next). Midrange EQ is 10kHz 20kHz often thought of as the most dynamic because the frequencies that define any particular sound are almost always found in this range. The HIGH MID EQ range (400 Hz to 8 kHz) includes the female vocal range as well as the fundamentals and harmonics for many instruments. +15 This control gives you +10 up to 15 dB of boost or cut +5 at 80 Hz. The circuit is flat 0 (no boost or cut) at the -5 center detent position. -10 This frequency represents -15 the punch in bass drums, 20Hz 100Hz 1kHz 10kHz 20kHz Low EQ bass guitar, fat synth patches, and some really serious male singers. Note: Used in conjunction with the Low Cut switch, you can boost the LOW EQ without injecting tons of infrasonic debris into the mix. 7. HIGH MID FREQ 11. EQ IN/OUT Switch  This knob ranges from  400 Hz to 8 kHz and  determines the center  frequency for the HIGH n MID EQ filter. This allows n you to zero in on the n precise narrow band of (Z High (Z Mid EQ K(Z Freq K(Z K(Z Sweep frequencies you want to have affected by the HIGH MID EQ. 8. LOW MID EQ +15 This is a second mid- +10 range EQ control that +5 provides 15 dB of boost 0 or cut centered at the -5 frequency determined by -10 its FREQ knob. It extends -15 20Hz 100Hz 1kHz Low Mid EQ down to 100 Hz, which 10kHz 20kHz includes the male vocal range and the fundamen- tals of some lower instruments (guitar, lower brass). This is a true hardware bypass of the Perkins EQ circuitry to insure that there is no coloration of the signal if the EQ is not needed. When this button is out, the EQ controls have no effect on the signal. You can use this switch to make an A/B comparison between the EQ'd signal and the signal without EQ. We have completely redesigned the EQ circuits in the Onyx Series of mixers, based on the designs of Cal Perkins, an industry-leader in audio engineering for over three decades and long-time Mackie collaborator. This "neo-classic" design provides the sweet musicality of the British EQ sound, while still maintaining 15 dB of boost and cut with optimum Q and minimum phase shift (in other words, it gives you plenty of control and is pleasing to the ear!). The 4-band equalization has LOW shelving at 80 Hz, LOW MID peaking, sweepable from 100 Hz to 2 kHz on the mono channels, HIGH MID peaking, sweepable from 400 Hz to 8 kHz on the mono channels, and HIGH shelving at 12 kHz. "Shelving" means that the circuitry boosts or cuts all frequencies past the specified frequency. For example, rotating the LOW EQ knob 15 dB to the right boosts bass frequencies below 80 Hz and continuing on Owner's Manual 11