Gainlab Audio BISHOP User manual

Op OPERATION AND SAFETY PRECAUTIONS
■Use only grounded electrical outlet!
■Do not open the device and don’t do any modifications on it!
■Do not attempt to repair or replace any of the components unless
specifically instructed to do so in this guide.
■Pay attention to not put any solid matter (flammable things, coin,
nail etc) or liquid (water, alcohol etc.) inside device.
■Do not twist or break the power cord or place heavy objects on it.
Doing so may damage the cable and cause a short circuit.
Damaged cables can cause fire and electric shock!
■Protect the device from intesive external shock! (for example:
falling down)
Never use the device in following conditions:
■Extreme temperature
■Moisture
■High humidity
■Rain
■Dust
■Heavy vibration
In the following cases, turn off the machine immediately, unplug the
power cord, and contact us ([email protected]):
■If the mains plug of the appliance is damaged
■If you notice smoke or an unusual odor
■If any object or liquid gets inside the device,
PLEASE NOTE THAT THE GLA-MP1 BISHOP IS INTENDED FOR PROFESSIONAL
USE. IT’S NOT A CONSUMER ELECTRONIC DEVICE. ITS INSTALLATION AND USE
REQUIRE CERTAIN PROFESSIONAL SOUND ENGINEERING KNOWLEDGE AND
SKILLS. LACK OF THIS KNOWLEDGE MAY RESULT IN MALFUNCTION, DAMAGE OR
PERSONAL INJURY.

■If the device has been exposed to rain or other moisture,
■If the device does not operate normally
■Do not connect the appliance to a mains socket to which an
electrical appliance controlled by an inverter, switching power
supply (eg. refrigerator, washing machine, microwave, air
conditioner) or a appliance with a motor is connected.
■Depending on the use of the electrical devices, power supply
noises may cause a malfunction or audible noise on this unit. If a
separate electrical outlet cannot be used, connect a noise filter
between this and the other electrical appliance.
■The unit heats up during several hours of continuous
operation. This is normal and not a cause for concern.
■Turn off all devices before connecting the device to other devices.
This will prevent damage to speakers and other equipment.
■Use of the unit near amplifiers or other equipment that contains a
transformer may cause noise. To resolve this issue, relocate the
device or move it away from the interfering device.
■Noise may be caused by using a wireless communication device
near the device, such as a mobile phone. Such noise can occur
when making, receiving, and diverting a call. If you experience this
problem, move the wireless device away from the device or turn it
off.
■This unit may interfere with radio and television operation, so do
not use near such receivers.
■If the device is transported to a location with a very different
temperature and / or humidity, moisture may condense inside.
Using the device in this condition may result in damage or
malfunction. Therefore, wait a few hours for the moisture to
completely evaporate before using the appliance.
Cl CLEANING AND MAINTENANCE
Clean the appliance daily with a soft, dry or slightly damp cloth. Use a
soft, abrasion-free cloth to remove stubborn dirt. Then wipe the device
with a dry cloth. Never use benzine, thinner, alcohol or other solvents,
strong alkaline or acidic cleaners as they may cause discoloration and
deformation.

Ow OWERVIEW
Me OUTPUT LEVER METER
The Output Level Meter provide information
about the magnitude of the signal level leaving
the unit. If it is need to reset the meter, with the
device turned off, use a straight slotted
screwdriver to turn the mechanical reset screw
until the pointer is in the center of the -20 point
value on the lower scale. 0 VU is equal to +8 dBu.

In INPUTS AND INPUT SELECTION
You can find several different inputs on
the Bishop. Two inputs on the back, for
microphone and line signal. A combo XLR
on the front panel for connecting
microphone, line source, or instrument. If
microphone is plugged into the front panel combo, it will
automatically disconnect the rear panel MIC input. With
the input selection switch on the front
panel, you can choose which type of signal
you want to use the device with.
Id INSTRUMENT DRIVE
It is possible to add extra distortion to the
instrument input. To do this, select the
instrument input on the input selector. Use
the drive potentiometer to set the desired
amount of added distortion.
Gs GAIN SELECTOR DIAL
The gain of the Bishop can be
set on the Gain Selector Dial.
The Gain Selector Dial is
divided into two sections, a Low
and a High section. The maximum
amplification of the Low section is
+40dB, the maximum amplification of
the High section is +60dB. It is
possible to switch between the
High and Low sections with the
switch labeled Gain, and within
the section it is possible to
select the desired gain value
with the gain rotary switch.
LINE INPUT MIC. INPUT

Switching between the High and Low sections is indicated by the scale
illumination and the High and Low LEDs. There is an overlap between the
selectable gain values on the High and Low scale. Due to the structure of the
preamplifier, the sound is different even if the same gain value is selected on the High or
Low scale.
Af PREAMPLIFIER ADDITIONAL FUNCTIONS
Phantom Power: It can turn on the +48V voltage which
is required for the operation of specific types of
condenser microphones. The +48V only appears on
microphone inputs. To activate the function, turn the function switch to
the right position. The ON position is indicated by an LED.
Some types of microphones can be damaged if they are exposed to +48V. Always check if
phantom power is required for the particular microphone. Before connecting or removing
a microphone, always turn off the phantom voltage function!
PAD: It lowers the gain of microphone input by -20dB. This may be
necessary for certain sources, or useful for performing certain
sound design tasks. To activate the function, turn the switch to the
upper position. Activation of the function is indicated by an LED.
Phase: Reverses the phase of the entire system. This can be useful when
recording with multiple microphones or when using Bishop in
combination with other devices. To activate the function, turn the
switch to the upper position. Activation of the function is indicated
by an LED.
Oc THE ONBOARD DUAL SLOPE OPTICAL COMPRESSOR
An integral part of the preamplifier section is an optical compressor
with two break-off points instead of one. Thus, it
provides significantly greater confidence and
flexibility in recording situations. If you want to
access the compressor functions, put the Optical

Compressor switch to the right position. The threshold values of the two
break-off points can be regulated with two separate potentiometers. The
potentiometer labeled Threshold
controls the value of the first break-
off point. The potentiometer labeled
2ND slope controls the value of the
second point. The amount of gain
reduction can be monitored on two
LED scales. GR1 shows
the gain reduction at
the first break point.
GR2 shows the gain reduction at the second break point.
The compression ratio and knee value can be selected as
a preset with the Character switch. The positions of the
Character switch use descriptive
names: "Soft", "Medium", “Hard". By
definition, the soft position indicates a
smaller compression ratio with a
gentle knee. The medium position
indicates a much higher compression
ratio with a more angular knee. The
hard position indicates an almost
limiter-like ratio with a sudden knee. The intervention
speed of the compressor is intended to be modified by the time constant
parameter. In Auto mode, the time constants of the compressor are
adjusted automatically depending on the dynamic
conditions of the signal. In addition, four more
stages are available from the fastest to the slowest.
Due to the nature of the compressor, the attack and
release values are set at the same time when
selecting a time constant. In addition, the sound of
the compressor can be fine-tuned by adjusting the
threshold values of the two slopes, along very wide
possibilities.
Fs THE ONBOARD FILTER SECTION
The basic functions of the filter section include the high-
pass filter. This is actually used to remove low frequency
rumble, a useful addition to any preamplifier. It can be

activated with the switch labeled HPF. The middle one is the off position. The
upper position of the switch turns on a high-pass filter with a frequency
of 120Hz with 6dB/oct order. The lower position of the switch turns on a
high-pass filter with a frequency of 60Hz with 6dB/oct order.
Another pillar of the filter section is the filter system
implementing the AIR function. In this case, we mean a
filter operating at the upper limit of the audible range and
at a higher frequency. This creates a very careful
shelving-like boost at the top of the audible frequency
range and complex saturation products at the high
frequency range, which makes it feel very airy and
pleasant. There are two available frequencies assigned to
the AIR function, which you can activate with the Dyn Air switch. The
middle position of the switch is the off state. By turning the switch up,
the 30KHz frequency can be reached. By turning the switch down, the 20KHz
frequency can be selected. If the compressor is switched off, the effect of
the AIR function is static. But if the compressor and
the AIR function are switched on at the same time. The AIR
function is implemented dynamically in such a way that
the greater the gain reduction on the compressor,
the boost in the AIR band will be higher.
At OUTPUT ATTENUATOR
The Bishop Channel Strip has an output attenuator to
make the most of the sound difference between the
amplification modes and that the built-in optical
compressor can be used most widely. You can
attenuate a total of -12dB from the output level, using
the six-position rotary switch, of which the first option
is the off state. Using the attenuator may reduce the signal/
noise ratio of the device.
Sl SIDECHAIN LINK
There may be a recording situation where it is necessary to
SC. LINK

use several Bishop Channel Strips simultaneously. So
that all the functions of two Bishops, including the
optical compressor, can be used in pairs, it is worth
sharing the side-chain signal of the two optical
compressors. This is possible using the sc.link connector on
the back device. The sidechain-link can be connected
using a TS Jack cable. With its help, the optical
compressors of the two separate devices can be run
together with an accuracy of +-2dB.
Sp SPECIFICATIONS
SIGNAL
GROUND
SIGNAL
GROUND
INPUT IMPEDANCE
Microphone
2KOhm
Line
18KOhm
Instrument
500KOhm
MAX. INPUT LEVELS
20Hz
100Hz
1Khz
Microphone
PAD Off
-2 dBu
+17 dBu
+20 dBu
PAD On
+18 dBu
+37 dBu
+40dBu
Line
+18 dBu
+26dBu
+26 dBu
Instrument
0 dBu
0 dBu
0 dBu
OUTPUT IMPEDANCE
<150 Ohm
MAX OUTPUT LEVEL
+30dBu
NOISE FLOOR
< -70 dBu Unweighted
SNR.
98 dB
10Hz-22Khz
< 1% THD
DISTORTION
<0.03% @ 0dB Output, 1Khz
<0.6% @+26dBu Output 1Khz
INPUTS:
2x Balanced XLR
1x XLR/Jack Combo
OUTPUT:
1x Balanced XLR
DIMENSIONS:
483mm x 280mm x 89mm
WEIGHT:
4.2 Kg
MAINS VOLTAGE:
230V AC (EU version)
110V AC (US version)

Lg LOW GAIN MAX FREQUENCY RESPONSE (MIC. INPUT)
-40dBu Input & 0dBu Output
Lg LOW GAIN POSITIONS FREQUENCY RESPONSE (MIC. INPUT)
-20dBu Input

Hg HIGAIN MAX FREQUENCY RESPONSE (MIC. INPUT)
Input -60dBu @ Output +2.4dBu
Hg HIGAIN POSITIONS FREQUENCY RESPONSE (MIC. INPUT)
-40dBu Input

Lg LOWGAIN THD+N VS. FREQUENCY (MIC. INPUT)
-40dBu Input & 0dBu Output
Hg HIGAIN THD+N VS. FREQUENCY (MIC. INPUT)
Input -60dBu @ Output +2.4dBu

Da DYNAMIC AIR FREQUENCY RESPONSE (MIC. INPUT)
Optical Compressor OFF
Da DYNAMIC AIR FREQUENCY RESPONSE (MIC. INPUT)
Optical Compressor ON

Oc OPTICAL COMPRESSOR CHARACTERISTICS
Soft Mode
Medium Mode
Hard Mode

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GAINLAB AUDIO 2023.
www.gainlabaudio.com