Sebatron SPIDER EQ Manuale utente
~Sebatron~
Innovative Australian Audio
SPIDER EQ - operating manual
Copyright Sebatron 2023
Two Channel Class A Transformerless Valve EQ
SPIDER
1/Introduction
2/Features
3/Functions and Dials
4/Inputs and Outputs
5/Operation
6/General Maintenance
7/Specifications
Table of Contents:
The Sebatron Spider EQ is a high quality Two Channel Class A
Transformerless Valve Equalizer housed in a 2U rack chassis designed for
tracking, mixing or mastering purposes.
Both channels of the Spider EQ feature upper and lower shelf bands
each with two selectable frequencies and two mid bell bands each with
four selectable frequencies to suit your audio equalization requirements.
Each band has up to 10db of boost or cut.
The Spider signal path uses optimised discrete op amps with high
voltage transistors as input and output buffering stages. A dual-triode valve
( or Vacuum Tube ) supplies the processing gain for the equalizer circuit.
All circuitry is Class A and operated in single ended mode to provide
maximum musicality with absolutely no cross-over distortion. The high
voltage supply rails ensure massive headroom for boosts or cuts and
minimize the possibility of noise and distortion. The bypass is relay driven
to guarantee no signal colouration when the unit is switched out of the
signal path.
Visual signal monitoring for the audio signals is provided by two
back-lit VU meters for accuracy and ease. The meters have a +4db or
+8db switchable operating point to aid with the monitoring of heavier
signals without slamming the meter.
In use the Spider is an incredibly useful tool as it enhances almost
any source material that is put through it. The extra harmonics generated
within the valve give the signal increased width, depth and definition.
It can take an ordinary sounding mix to a new level by taming the
frequencies that need to be tamed and pushing the frequencies that matter
the most.
1. Introduction
2. Features
-Full relay driven bypass
-Rugged discrete solid-state Class A input/output buffering stages
-Two twin-triode valves running on high voltage and DC filament
supplies
-Four bands ( two outer shelves and two mid bells ) of active valve
equalization
-10 db approx. boost or cut per band
-LOW switchable 40hz/80hz shelf 6db per octave
-LOW-MID wide ‘Q’ switchable 160/220/360/500hz frequency bands
-HIGH-MID tight ‘Q’ switchable 1.2k/2.2k/4k/5khz frequency bands
-HIGH switchable 8khz/14khz shelf 6db per octave
-Variable and transparent output gain
-
Accurate two channel VU metering with backlit globes
-Accurate two channel VU metering with backlit globes-
-Switchable +4db/+8db output range metering
-Fully balanced XLR inputs and outputs
-Low noise and wide bandwidth specifications
-Switchable 115/230 VAC mains operation
-High quality components and parts used throughout
-Solid and durable build housed in a 2U rack chassis
2. Features
-Full relay driven bypass
-Rugged discrete solid-state Class A input/output buffering stages
-Two twin-triode valves running on high voltage and DC filament
supplies
-Four bands ( two outer shelves and two mid bells ) of active valve
equalization
-10 db approx. boost or cut per band
-LOW switchable 40hz/80hz shelf 6db per octave
-LOW-MID wide ‘Q’ switchable 160/220/360/500hz frequency bands
-HIGH-MID tight ‘Q’ switchable 1.2k/2.2k/4k/5khz frequency bands
-HIGH switchable 8khz/14khz shelf 6db per octave
-Variable and transparent output gain
Accurate two channel VU metering with backlit globes
-Switchable +4db/+8db output range metering
-Fully balanced XLR inputs and outputs
-Low noise and wide bandwidth specifications
-Switchable 115/230 VAC mains operation
-High quality components and parts used throughout
-Solid and durable build housed in a 2U rack chassis
SPIDER EQ
The Spider EQ is equipt with two High shelf frequencies and
two Low shelf frequencies. Both shelf slopes are 6db per octave.
The Low shelf adds weight and width to a mix and the High shelf opens
up the response and adds clarity.
Each shelf band has up to 10 db of boost or cut in the desired frequency.
Interactivity between the shelf and mid bands happens when the dial is
in the dotted line range.
Low Shelf
40 HZ
80 HZ
High Shelf
8KHZ
14KHZ
3. Functions and Dials
3. Functions and Dials
The two mid bands each feature a choice of four frequencies.
The Low-Mid band has a wide bell ( or low ‘Q’ ) to facilitate wide boosts
or cuts in the lower midrange frequencies.
The High-Mid band has a narrower bell ( or high ‘Q’ ) to facilitate thinner
boosts or cuts in the higher midrange frequencies.
Each bell band has up to 10 db of boost or cut in the desired frequency.
Interactivity between the shelf and mid bands happens when the dial is
in the dotted line range.
Low-Mid ( wide ‘Q’ approx 1-2)
160 HZ
220 HZ
360 HZ
500 HZ
High-Mid ( tight ‘Q’ approx 5-6)
1.2KHZ
2.2KHZ
4KHZ
5 KHZ
Channel 1 Output/Input
Channel 2 Output/Input
Balanced XLR Balanced XLR
The Sebatron Spider is equipt with electronically balanced
XLR inputs and outputs.
All XLR inputs and outputs are :
pin 1=shield, pin 2=hot (+), pin 3=cold (-).
4. Inputs and Outputs
IEC Mains Power Input
Voltage Selector Switch
The Sebatron Spider EQ can be switched between different global
mains voltages via the Voltage Selector Switch on the back of the unit.
This switch is usually set in the factory for the appropriate voltage
that the unit is destined for, however, in cases of resale etc. it is always
recommended to check this switch before initial power up.
If the Voltage Selector Switch is set to the wrong position the fuse
should blow before any damage occurs. This situation would occur
when the switch is set to 115VAC but the input voltage is 230VAC.
Fuse rating is 0.8 amp @ 240/250 volts ( or 1.6 amp @ 110/120 volts ).
4. Inputs and Outputs
For best operation it is recommended that the Sebatron Spider EQ is
connected to a balanced output and fed by fully balanced signals rated at
the +4db nominal standard operating level.
To confirm the signal is in the right range refer to the VU metering to
ensure that the signal does not exceed the scale which could cause
distortion nor does the signal remain in the lower region of the VU meter
which could make it become prone to being noisy.
Once you have connected the Spider EQ to a suitable signal source
and confimed the range is within the range displayed on the VU meter then
you can follow the procedure below :
1.Set all bands and shelves to flat - noon position on each of the frequency
band dials
2.Set Low-Mid band frequency selector to 160 hz and High-Mid band fre-
quency selector to 1.2khz
3.Flick between bypass and active using the bypass/active toggle switch
and match the two levels in loudness using the output level control
4.Proceed to adjust Equalizser bands to taste keeping in mind to adjust the
output level control to maintain the output signal in the desired processing
range and from clipping the next unit the Spider EQ is plugged into
5. Operation
