User manual ALLEN & HEATH GL4800

[. . . ] ALLEN&HEATH GL4800 USER GUIDE Publication AP6150 Limited One Year Warranty This product is warranted to be free from defects in materials or workmanship for a period of one year from the date of purchase by the original owner. To ensure a high level of performance and reliability for which this equipment has been designed and manufactured, read this User Guide before operating. In the event of a failure, notify and return the defective unit to Allen & Heath Limited or its authorised agent as soon as possible for repair under warranty subject to the following conditions Conditions Of Warranty 1. The equipment has been installed and operated in accordance with the instructions in this User Guide 2. [. . . ] The M meter displays the LR sum (mono) signal. A low M meter reading compared with LR meters can indicate a phase problem between L and R. This can be checked and corrected using the stereo channel POLARITY (R) switch. You can listen to the signal in mono by pressing the STEREO/MONO switch in the console monitor section. TALKBACK - Plug in a microphone and adjust TB LEV to talk to the outputs you select on the talkback assign switches. An internal link assigns +48V phantom power if required. Talkback will be activated to the selected destinations when you press the large TALK button. If any destination is selected the green LED in the TALK button will light, useful if you want to be sure that the talkback system is made 'safe' during the show. You can talk to the 10 auxes in any combination, to the M mix, LR mix, all 8 groups together, and all 4 matrix together. 4 3 2 1 0 10 5 REPLAY TO L-R PFL AFL ACTIVE PFL STEREO PFL MONO M +16 +9 +6 +3 0 -3 -6 -9 -12 -15 -20 -30 TB MIC IN TB TO M TB TO L-R TB TO GRP TB TO MTX 6 7 8 9 TB LEV 48V +V -V TALK GL4800 User Guide 27 MTX 0dB +6 1 MTX 0dB +6 2 THE MONO MIX - The GL4800 includes an independent mix buss for the M (mono) output. Each channel and group can be routed direct to this buss by pressing the related M routing switch. The signal is sourced pre PAN control so that the mono mix is not affected when the stereo mix image is adjusted. The M output can be a different mix to LR. If you want the mono output to be the sum of the L and R mix then use the L(R) TO MONO controls to mix L and R to M. Some typical applications of the Mono output: Centre speaker feed - To fill out the sound between the left and right speakers. This is usually positioned to benefit the audience nearest the stage. Mono PA system - Here, the L and R mix can be used as additional subgroups or for a separate stereo recording. Sub bass feed - To drive a speaker designed to reproduce the very low frequency sounds in multi speaker systems. MTX 0dB +6 3 MTX 0dB +6 4 M POST PRE WEDGE MODE M MIX AFL/PFL MATRIX SENDS FROM MONO - The mono buss signal may be mixed into matrix 1 to 4 by adjusting the matrix send controls. The signal is sourced pre or post the M fader by selecting the POST/PRE switch. MONO MASTER - The M mix is controlled using a 100mm fader. As with the groups and LR: automated MUTE, a pre fade mix meter, matrix sends, insert and AFL are available. STAGE MONITOR MODE - Unique to Allen & Heath consoles, an underpanel mode switch determines how the Mono section operates. In the normal up position it provides a conventional mono buss output for front-of-house applications as described above. When pressed, the Mono section is reconfigured as the stage monitor engineers listen wedge control. [. . . ] Select POST for LR2 so that the output follows the LR faders. Adjust LEV to match the operating level of each amplifier to give the desired listening level with optimum console signals (faders and meters operating around '0'). A correctly matched system ensures the best signal-to-noise and headroom performance. The balance between the speakers can also be adjusted using LEV. [. . . ]