Yamaha PM4000 Owner's Manual (image) - Page 21
AUX 1 - 8 Send level & Pre/Off/Post switches
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NOTE: PM3000 users will notice there is no EQ CLIP indicator. Clipping at this stage can occur even though the input signal is not clipping, due to boost (gain) applied with the EQ circuitry. In the PM4000, clipping in the equalizer is detected and shown on the PEAK indicators [7S] adjacent to the GAIN controls. 13. EQ (In/Out switch) This locking switch activates the channel EQ or bypasses it completely. The EQ is active when the switch is engaged (and the LED in it is on). Bypass allows for A-B comparison, and absolutely minimum signal degradation when EQ is not needed. 14. HPF (H.P. filter in/out switch and control) This locking switch activates the input channel HIGH PASS FILTER or bypasses it. The filter is active when the switch is engaged (and the LED in it is on). This filter bypass function is independent of the EQ section, which has its own bypass switch. 20~400Hz This rotary control sweeps the cutoff frequency of a high pass filter (or "low cut" filter) from 20 Hz to 400 Hz. The filter slope is 12 dB per octave. Typical applications including cutting wind noise, vocal "P" pops, stage rumble, and low frequency leakage from adjacent instruments. You can use higher frequency settings to reduce leakage into mics that are primarily handling high-frequency sources. It is a good practice to use the filter to protect woofers from unnecessary over-excursion due to the presence of unneeded low frequency or sub-sonic components, especially if a microphone is dropped or kicked. Bypass the filter (switch up) only when you want very low frequencies, as with an organ, drum, bass guitar, and so forth. 15. (feature number 15 is not used in this module) 16. INSERT ON This locking switch activates the channel's INSERT IN jacks, from which it applies signal to the rest of the channel. The INSERT OUT jack is always "live," and this switch does not affect it. The primary use of this switch is to select or deselect any signal processor or independent line input source which may be plugged into INSERT IN. When the switch is engaged, making the Insert In jack "live," the LED in the switch is on. If there is nothing plugged into an INSERT IN jack, operating this switch has no effect. Figure 2-2b. PM4000 Stereo Input Module (middle portion of module) NOTE: A signal processor (effects device) can be set up before it is needed, its levels adjusted using the always active INSERT OUT signal, and then the processor can be inserted on cue in the channel's signal path by pressing this switch. 17. AUX 1 - 8 (Send level & Pre/Off/Post switches) There are 8 rotary AUX send level controls with concentric PRE/OFF/POST switches. The switch mutes (turns off) the send, or derives signal before (PRE) or after (POST) the channel fader and equalizer. The inner rotary control determines how much of the selected signal source is applied to the correspondingly numbered auxil- Page 2-10