Mackie Thump TH15A Owners Manual - Page 9
HIGH EQ, 6. MID EQ, 8. LOW EQ, 9. DIRECT/EQ Switch, 10. POWER Switch, 11. Line Cord Socket and Fuse
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5. HIGH EQ 10. POWER Switch This control gives you up to 15 dB boost or cut above 12 kHz, and it is also flat at the center position (U). Use it to add sizzle to cymbals, and an overall sense of transparency or edge to the keyboards, vocals, guitar, and bacon frying. Turn it down a little to reduce sibilance, or to hide tape hiss. 6. MID EQ This is a midrange EQ control that provides 15 dB of boost or cut centered at any frequency between 100 Hz and 8 kHz. The MID EQ circuit is flat (no boost or cut) at the center position. This frequency range includes most vocals (male at the lower end of the range and female at the upper end of the range), and the fundamentals and harmonics for many instruments. Use this switch to turn the active loudspeakers on and off. The indicating LED above the POWER switch lights when the POWER switch is on and AC power is available at the linecord socket. A second power indicator is located on the front of the cabinet. 11. Line Cord Socket and Fuse Connect the detachable line cord to this IEC socket securely, and plug the other end into your AC outlet. Make sure the AC power is matched to the AC power indicated on the rear panel (under the IEC socket). The fuse is located behind the fuse cover, at the bottom of the IEC socket. See the "Troubleshooting" section on page 9 for information about replacing the fuse. 7. MID FREQ This knob ranges from 100 Hz to 8 kHz and determines the center frequency for the MID EQ filter. This allows you to zero in on the precise narrow band of frequencies you want to have affected by the MID EQ. 8. LOW EQ This control gives you up to 15 dB of boost or cut below 80 Hz. The circuit is flat (no boost or cut) at the center position. This frequency range represents the punch in bass drums, bass guitar, fat synth patches, and some really serious male singers. 9. DIRECT/EQ Switch This switch allows you to bypass the EQ section. When the switch is out (DIRECT), the EQ section is bypassed and the EQ knobs have no effect on the signal. When the switch is pushed in (EQ), the EQ controls can be used to tailor the frequency response of the TH-15As.