Using The Preamp - Joemeek gbQ User Manual

12
Output
The 'OUTPUT' control sets the volume of the distorted and Meequalized
signal. It goes from unity gain right down to nothing, to fade the sound out
completely. It has no effect when 'BYPASS' is on.
Adding distortion and boosting with the Meequalizer generally makes the
guitar louder, so the 'OUTPUT' control is used to restore the original level.
In this way there need be no change in volume between the processed and
unprocessed sound if that is what is required. –
Connections
OUTPUT (Jack)
Use this connection to feed a guitar amplifier or other effects pedals.
PHONES (Jack)
This output drives most high impedance headphones.
DI OUTPUT (XLR)
This provides a balanced, line-level feed to a mixing desk. A screwdriver
'LEVEL' control on the back of the gbQ sets the volume, independently of
the Guitar Amp and Headphone outputs.
Pin 2: + (hot)
Pin 3: - (cold)
Pin 1: ground
The XLR output is properly balanced, which is to say there is a signal on
both pins. In this way the maximum possible common-mode rejection of
interference, can be achieved at the receiving end.
Using the gbQ
GETTING CONNECTED
The figure shows the gbQ being used in a typical setup:
USE ONLY CORRECT
POWER SUPPLY:
9V - 18V ac/dc
LIFT
LEVEL
GROUND
POWER
DI OUTPUT
MIXER
The SEND & RETURN are being used to divert the sound through an
external delay processor. The delay is then switched off when the gbQ's
'BYPASS' footswitch is pressed. The DI Output provides a separate feed to
the PA System.
13
It is wired as follows:
GUITAR
AMP
gbQ
DESIGNED IN THE UK FOR PMI AUDIO.
Guitar/Bass Processor
MADE IN CHINA.
NO USER SERVICEABLE PARTS.
REFER SERVICE TO QUALIFIED PERSONNEL.
www.joemeek.com
PHONES RETURN SEND
DIGITAL DELAY
To run the DI Output unbalanced, ground pin 3 of the cable connector. This
boosts the signal on pin 2 by 6dB so that there is no drop in level when
running unbalanced.
If mains hum is apparent when using the gbQ with a PA System, move the
' GROUND' switch to the 'LIFT' position. In this way the signal ground is
connected by some other circuit within the overall system, thereby
avoiding "hum loops".
SEND and RETURN (Jacks)
This pair of unbalanced jacks on the rear panel allows you to patch other
pieces of equipment into the gbQ, such as a digital delay effects processor.
Connecting other equipment in this way, has the advantage that the gbQ's
overall 'BYPASS' footswitch bypasses the other equipment as well.
When no jack is inserted, the sockets are internally linked, or "normalled",
so that the signal flows uninterrupted.
POWER
The gbQ can be powered either using the supplied 12Vac adaptor, or any
third-party guitar effects power supply in the range 9V - 18V, ac or dc. This
means that the gbQ can be powered from almost any existing pedalboard,
so long as you have a connector that fits the power socket.
Use of other voltages may damage the gbQ and damage so caused will
invalidate the warranty. In particular:
DO NOT ATTEMPT TO CONNECT TO MAINS VOLTAGE!!!
POWER SUPPLY
Connect the Power Supply to the 'POWER' connector on the rear panel
and switch on the mains supply. NB: Use only the 12Vac mains adaptor
supplied, or a proper guitar pedal supply in the range 9V to 18V, ac or
dc. Use of any other power supply may damage the gbQ and
invalidate the warranty.

Using the Preamp

Turn the 'INPUT' control to minimum and connect the guitar. Press the
'BYPASS' footswitch so that the red LED lights. The Distortion Generator
and Meequalizer are now bypassed so that only the Preamp is in use.
Adjust the 'INPUT' until you have a working volume from the guitar amp.
The amount of gain required will depend on the particular type of guitar and
pickups.
EN55103
Q