Mackie PPM1008 Owner's Manual - Page 13
Line/instrument Inputs Ch. 5 And 6 - powered mixer review
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Owner's Manual Never plug s ingle-ended (unbalanced) microphones, or ribbon mics into the mic input jacks if phantom power is on. Do not plug instrument outputs into the mic XLR input jacks with phantom power on, unless you know for certain it is safe to do so. 8. MONO LINE INPUTS (CH. 1 to 4) These 1/4" jacks share circuitry (but not phantom power) with the mic preamps, and can be driven by balanced or unbalanced sources. To connect balanced lines to these inputs, use a 1⁄4" Tip-Ring-Sleeve (TRS) plug. To connect unbalanced lines to these inputs, use a 1⁄4" mono (TS) phone plug or instrument cable. The mono line inputs may employ high or low gain based upon the setting of the switch [32]. Please review the gain switch settings on page 18 for more information. 9. LINE/INSTRUMENT INPUTS (CH. 5 and 6) The line-level inputs for channels 5 and 6 can also accept instrument-level signals if the hi-z switches [34] are pressed in. This allows you to connect guitars directly to channels 5 and 6, without the need for a DI box. The input impedance is optimized for direct connection, and high-frequency fidelity is assured. The line/instrument inputs may employ high or low gain based upon the setting of the switch [32]. Please review the gain switch settings on page 18 for more information. 10. STEREO LINE INPUTS (CH. 7 and 8) Channel 7 and 8 have stereo line inputs. If you just have a mono source, plug it into the left input of channel 7 or 8 (labeled left/mono), and the signal will appear (as if by magic) equally on the left and right of the main mix. The stereo line inputs may employ high or low gain based upon the setting of the switch [32]. Please review the gain switch settings on page 18 for more information. 11. RCA INPUTS (CH. 7 and 8) Channel 7 and 8 also have RCA line inputs, suitable for connecting the line-level, unbalanced output from CD players, tape decks, iPod docks etc. They are not suitable for direct connection of phono-level outputs from turntables, as a phono preamp is required. 12. INSERT (CH. 1 to 6) These unbalanced 1/4" jacks on channels 1 to 6 are for connecting serial effects processors such as compressors, equalizers, de-essers, or filters. The insert point is after the gain switch [32] and compressor circuits (on channels 1 - 4), but before the channel's EQ and level [31] controls. The channel signal can go out of the insert jack to an external device, be processed (or whatever) and come back in on the same insert jack. To do this requires a special insert cable that must be wired thusly: ring tip sleeve (TRS plug) SEND to processor "tip" This plug connects to one of the mixer's Channel Insert jacks. "ring" RETURN from processor Tip = send (output to effects device) Ring = return (input from effects device) Sleeve = common ground Insert jacks can be used as channel direct outputs; post-gain, and pre-EQ. See the connector section on page 26 (figure F) showing three ways to use insert connections. 13. TAPE OUTPUTS These stereo unbalanced RCA outputs allow you to record the main stereo mix onto a tape deck, hard disk recorder, automatic CD burner, or a computer, for example. This allows you to make a recording for posterity/archive/legal purposes whenever the band gets back together again. The tape output is the stereo main mix, not affected by the main level [38], or the main graphic EQ [36]. 14. BREAK SWITCH and LED This important "take-a-break" switch quickly mutes all the microphones and the mono channel line-level inputs when the band is between sets. This will prevent protestors or rogue karaoke singers from storming the stage at the interval. The monitor 1 and FX/monitor 2 outputs, and the drive signal to the internal effects are also muted. The LED will come on, as a reminder that the break switch is engaged. Check this LED first, if you are having trouble with no sound in your system. You can still play the stereo channel line inputs [10] and RCA inputs [11] in the main stereo mix. For example, you could play a soothing CD to restore order before the police arrive. Owner's Manual 13