Cavern PA System Instructions

Bauhn power plug mains power Cavern Studio

Powering Up

The entire PA system powers up, and down, via a single button push.  First, locate the white plug unit marked “Bauhn” in the middle of the rack beneath the mixing desk.  It’s between the two power amplifiers. Simply press the button and all of the equipment should come to life.


Please make sure you do not turn on or off any of the individual units in the rack or the desk itself. All of this equipment is required to be on for the system to function correctly.


To turn off the system, press the button on the Bauhn power pack.


Mixing console Cavern room


The Mixing Console


The four microphones (three at the front and one near the drummer) are on the first four channels of the mixing console.  These should be set up without needing to do anything other than un-muting them.


Un-muting can be done by pressing the mute buttons for each channel that you are using located just above the channel faders. The green LED light on that button must be on for the channel to work.


The fader itself is the level of volume that is sent to the two main speakers in front of the mirror.  The master fader, located at the far right of the desk should be turned up to unity (about two thirds of the way up marked by a 0)


The gain and EQ for each channel has already been set by our engineers for the best sound.  


Aux send 1 (knob on each channel below the EQ section) can be used to send volume of that channel to the drummer’s fold back speaker.


Other Aux sends are not connected to anything and therefore don’t do anything if you turn them up… excepting for the one that says FX.  This knob controls how much reverb is on the channel. Feel free to add or subtract reverb as desired.


A general rule of thumb is that these should be the only things that you need to touch to have great sound.  If you are finding that the PA system is not loud enough for your needs, the issue lies in the volume of the rest of the instruments in the room, not the PA.  The PA system is set up to be right for the environment. Guitar and bass amplifiers, etc should be turned down to a level where the vocals can be properly heard.  


Adding additional instruments into the PA


Although the PA system is primarily for vocal use only we do allow certain instruments to be connected for your convenience.  Acoustic guitars, keyboards, electronic drum kits (provided their volume is not excessive) and drum machines may be plugged into line inputs of the mixing console.


Line input ¼” jack sockets can be found on the second row of sockets down from the top on the back of the mixing console.  Please make sure that channels are muted and that gain knobs are set to the fully off position before plugging an instrument in and when unplugging.


Once you have plugged in your instrument, un-mute the channel, play the instrument while turning up the volume fader to the unity position.  For additional level, now adjust the gain knob upward (slowly) whilst still playing the instrument until the desired volume is reached.

Mixing console and rack equipment Cavern room

Rack equipment


All rack equipment has been expertly set for the best sound.  Please do not alter any settings or turn off anything in the rack.




If you are experiencing problems getting sound, it is likely something fairly simple.


First, check that the power is on for all units.  (everything has a light of some description. If you see something doesn’t have a light on, turn on that unit.  Once again, these should be on at the press of the main power button.  

Check that the channel’s green light is on.

Check that the main mix fader is turned up.

Check that the channel is routed to the main mix (there are buttons beside each fader on each channel that can allocate routing to the subgroups and the main fader.  There is no need to allocate anything to the subgroups but each channel must be allocated to the main mix in order to pass sound)


If none of these fix the issue, please feel free to call on one of our friendly staff to help.  If there are no staff on site, call the studio number 9905 0010.  


Shutting Down

Please remember to turn off equipment before leaving the studio.  To turn off The Cavern PA system, simply press the button on the white plug pack (marked Bauhn) a second time.  Do not power off individual system units by their power switches.