Mackie 408M Owner's Manual - Page 15

EFX Send This taps the channel's signal out to either the internal EMAC Digital Stereo Effects Processor or to an external device via the EFFECTS SEND jack for parallel effects processing. Each channel's effects send signal is controlled by the channel's EFX knob, and the overall effects send level is controlled by the EFX DRIVE LEVEL knob (located in the EMAC section). The effects send signal is post-EQ and postVOLUME, so these controls affect the signal going to the effects processor, be it internal or external. Each EFX send control ranges from off through unity (the center detent position) on up to +10 dB of extra gain (when turned fully clockwise). Chances are you'll never need this much extra gain, but it's nice to know it's there if you do. Normally the effects send signal is routed to the internal EMAC Digital Stereo Effects Processor (more on EMAC coming up). However, if you plug into the EFFECTS SEND jack (located just below the EMAC section) you can send the effects signal to an external effects device. You can return the signal from the external effects device by plugging its output into the EFFECTS RETURN jack(s) just below the SEND jack. This disconnects the EMAC from the internal effects bus. You mix the amount of effects you want returned to the main mix by adjusting the EFX TO MAIN control located just above the MAIN MASTER . You can also add effects to the monitor mix by adjusting the EFX TO MON control located just above the MONITOR MASTER . Note: See "Effects Send and Return" on page 22 to see how to use EMAC and an external effects processor at the same time. MON Send This taps the channel's signal out to an external amplifier, which powers your monitor speakers, via the MONITOR LINE OUT jack. Each channel's monitor send signal is controlled by the channel's MON knob, and the overall monitor send level is controlled by the MONITOR MASTER control. The monitor send signal is pre-EQ and preVOLUME, so if you adjust these controls they will affect only the main mix and not the monitor mix. Each MON send control ranges from off through unity (the center detent position) on up to +15 dB of extra gain. EMAC Section Description EMAC™ stands for Extended Multiply and Accumulate, which is a proprietary 32-bit digital stereo processor developed by our Digital Engineering Group. It provides 16 preset digital effects algorithms for you to select. In addition to the presets, there are two parameter controls / you can adjust to change the sound and make it unique for your particular application. CUSTOM 32-BIT PRECISION DIGITAL STEREO EFFECTS PROCESSING NORMAL 0 12 EFX DRIVE LEVEL EFX CLIP EFX BYPASS EFX WIDE EFX DRIVE LEVEL This controls the signal level being sent to the input of the EMAC module (and to the EFX SEND jack). Use the EFX controls on the individual channels to adjust the amount of each channel's signal you want to go to the EMAC. Leave the EFX DRIVE LEVEL set at the NORMAL position. If you find that you're not getting enough of the effect in the main mix, make sure that the EFX TO MAIN control is turned up at least to unity (the center detent position). It's okay to turn up the EFX DRIVE LEVEL some more if you need to. Just make sure the EFX CLIP LED never lights more than occasionally. Read on to find out why. EFX CLIP This indicates when the EMAC is 6 dB below clipping. This LED should only light occasionally. If it blinks frequently, you should turn down the EFX DRIVE LEVEL a little. Digital clipping is not pleasant to behold. EFX BYPASS Pushing in this button causes the EFX BYPASS indicator to light and mutes the effects signal. It affects both the internal EMAC effects and any external effects processor you may have connected to the EFFECTS RETURN jack. OO OO OO U 1 MON +15 U EFX +10 U -15 +15 HI 12kHz U -12 +12 MID 2.5kHz U -15 +15 LOW 80Hz NORMAL INPUT LEVEL SET LOW HI U +20dB 1 VOLUME CH. INSERT LINE MIC 1 Mono Version Channel Strip 15