Mackie HD1531 Owner's Manual - Page 5

Rear Panel Features 1. MAIN INPUT This is a female XLR-type connector that accepts a balanced line-level signal from a mixing console or other signal source. 1 2. LOOP OUT This is a male XLR-type connector that produces exactly the same signal that is connected to the main in- 2 put jack. Use it to daisy-chain several HD1531's together off the same signal source. Contour EQ This built-in 3-band EQ allows the HD1531 to be tailored for any sound application. Use it to help compensate for poor room acoustics, boost highs and lows for low-volume applications, or for any other variety of needs. 3. EQ ON Press this in to engage the Contour EQ circuit. The LED next to the switch will light to indicate that the EQ is on. Use this switch to engage or bypass the EQ, or toggle it repeatedly while listening carefully to judge the EQ's effect. 4. LOW This knob allows up to +3 3 dB of boost or cut at +2 +1 80 Hz, with no change 0 in level at the unity -1 -2 (U) mark. This is a -3 shelving EQ. 20Hz 100Hz 1kHz 10kHz 20kHz 5. MID This knob allows up to 3 dB of boost or cut at a mid frequency set by the freq knob (6), with no change in level at the unity (U) mark. This is a peaking EQ. 6. FREQ This knob allows you to adjust the center frequency of the mid-peaking EQ, from 100 Hz to 8 kHz, with 600 Hz at the center position. +3 +3 +2 +2 +1 +1 0 0 -1 -1 -2 -2 -3 -3 20Hz 100Hz 1kHz 10kHz 20kHz 20Hz 100Hz 1kHz 10kHz 20kHz 3 9 10 11 -6dB +6dB 4567 8 12 13 Owner's Manual  Owner's Manual