Mackie SR244 / SR324 Owner's Manual - Page 33
Main Inserts L & R, Aux Sends
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MAIN INSERTS L & R Just below the MAIN OUTS jacks [11] at the left of the rear panel are the MAIN INSERT L and R jacks [12]. Like the channel and submix inserts, these patch points allow you to insert a processing device, such as a compressor or an equalizer, into the main left and right mix buses. Any processing you do at this point will affect your entire mix. The insert point is after the bus mixing amplifiers but before the master fader. The MAIN INSERT jacks are wired in the same way as the other insert jacks on the SR24•4. The inserts are made through a 1/4" TRS (tip-ring-sleeve) phone jack, and offer both an unbalanced main send or output and an unbalanced main return on the same jack. The nominal insert send and return level is 0dBu, and the insert return clipping point is +22dBu. The sleeve of the jack is connected to ground for both insert send and return signals. The tip is the insert send signal, and the ring is the insert return signal. NOTE: These inserts can be used as pre-fader direct outputs, using an unbalanced 1/4" (TS) phone plug in one of these two ways: Insert the plug just to the FIRST click. Do not push the plug all the way in. This connection allows you to tap a direct out without interrupting the channel strip signal; or Insert the plug all the way in to the SECOND click. This also provides a direct out connection, but the channel strip signal is interrupted at that point. See Figure D on page 30. AUX SENDS Here is where many boards fall short when it comes to sound reinforcement purposes. The SR24•4 offers SIX (6) independent auxiliary sends. The outputs of each are capable of driving a balanced line. This means that you no longer have to use balancing transformers to get your monitor sends to the stage. Just plug in a balanced TRS plug into one of the Aux outputs and run a line to the monitor graphic EQ. Voila! The six auxiliary send buses of the SR24•4 appear at the six numbered 1/4" AUX SEND jacks, located near the rear panel's left side[13]. The AUX SEND connections are impedance balanced 1/4" TRS (tip-ring-sleeve) phone jacks, with sleeve connected to ground, tip to signal "hot" (or "high" or "+"), and to ring to signal "cold" (or "low" or "-"). These jacks are also wired to accommodate unbalanced 1/4" TS Layout and Function MAIN OUTS L 1 AUX SENDS 4 STEREO AUX RETURNS R L1 1 SUB OUTS 5 SUB INSERTS 1 R 2 5 R 2 L2 6 2 L 3 6 R 3 L3 7 3 R R LR 4 L4 8 4 MAIN INSERTS CONTROL ROOM OUT (MONO) 31