Yorkville Sound YS1011 owner manual 29. L&R Main Master Send Faders and Clip LEDs, 31. L/R Main EQ

Speaker

Processor

Enable

Slope

29. L&R (Main) Master Send Faders and Clip LEDs

The left and right main summing buss receives signals directly from the channel faders, as well as the three L&R Return Levels controls. Clip LEDs fire 6 dB lower than actual clip- ping so some activity is allowable. Signal routing goes from the master faders (to Stereo EQ)… and to the Speaker Processor. Then, to both the L&R Line Level Outputs and the normally closed switching lugs on the Amp A&B Input jacks – thereafter to amps A&B. (At the same time, the post-master signal goes directly to the Record outputs, bypassing the EQ, processor, etc.)

The Clip LEDs are unlikely to fire as this stage of the mixer has a large amount of headroom. However, if one, or both LEDs become very active (small amounts of activity are OK), check the Return Levels Clip LEDs and reduce the settings of any L&R Return Master/s in channels showing clipping.

The L&R Masters regulate the level of the main stereo mix available at the Record Outputs (no main EQ). and the L&R Line Level Outputs. They also regulate the ampli- fier A&B power output levels (unless another mixer has been patched into the Amp A&B Inputs in which case its masters will determine power output).

50 Hz

80 Hz

30. Speaker Processor Curve and Enable Buttons

The PowerMAX features a choice of two low-frequency boost curves centred at 50 Hz and 80 Hz and selectable via the Curve button. The 50 Hz curve has a high Q-factor for sub- woofers while the 80 Hz curve is slightly broader and better suited for full range cabinets. An Enable, On/Off switch is also provided.

It is advisable to use this feature judiciously. For example you would probably not want to boost the main L/R EQ’s low frequencies while it is enabled. On the other hand, it can

add valuable depth to the speaker
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31. L/R Main EQ

This is a stereo 9-band EQ on the output of the main bus. Range is +/-12 dB with centers at one-octave intervals from 63 Hz to 16 kHz.

The main EQ would most often be set during a sound check and used to careful- ly adjust main speaker response (no radi- cal boosts). It is also useful for curbing feedback tendancies, but remember that monitors most often cause your feedback problems. Naturally, monitor feedback comes out the main P.A. too which, when you are out front at the mixer station, leads to the illusion that the main sys- tem needs EQing. See under Mon 1 and Mon 2 EQ’s for more about this.

When setting the main EQ, do not automatically go to a smiling curve as with a home stereo – this will cost your system both headroom and gain before feedback. Initially, keep the EQ curve as close to flat (all slid- ers at center) as possible, then make necessary adjustments as required during the sound check to cut feed- back frequencies.

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