Axel Oxygen 3, Oxygen 3ST Operating Manual

Oxygen 3 / 3ST

Broadcast Mixing Console

Operating manual

(Rel. 1.2)

Via Caduti Di Sabbiuno 6/F - 40011 Anzola Emilia - Bologna - Italy Tel. [phone] - Fax. [phone]

e-mail: [e-mail]

- web site: www.axeltechnology.com

1 CONTENTS

CONTENTS

ENG

2 SAFETY IN STRUCTIONS.....................................................................................................................4

3 OXYGEN 3 SERIES - OVERVIEW........................................................................................................ 5

4 OXYGEN 3 – AUDIO INPUT CONNECTIONS...................................................................................... 6

4.1 CH 1 to 3........................................................................................................................................6

4.2 CH 4 and 5..................................................................................................................................... 6

4.3 CH 6..............................................................................................................................................6

5 OXYGEN 3 ST – AUDIO INPUT CONNECTIONS.................................................................................7

5.1 CH 1, 2 and 3................................................................................................................................. 7

5.2 CH 4, 5 and 6................................................................................................................................. 7

6 TELEPHONE CONNECTIONS (OXYGEN 3 and 3 ST).........................................................................8

7 OUTPUT CONNECTIONS (OXYGEN 3 and 3 ST)................................................................................ 9

7.1 MASTER outputs........................................................................................................................... 9

7.2 MONITOR OUT and EXT-IN connections (OXYGEN 3 and 3 ST) ................................................. 10

7.3 LED-METERS.............................................................................................................................. 10

8 OXYGEN 3 – INPUT MODULE DESCRIPTION .................................................................................. 11

8.1 CHANNELS 1 to 6........................................................................................................................ 11

9 OXYGEN 3 ST – INPUT MODULE DESCRIPTION............................................................................. 12

9.1 CHANNELS 1 to 6........................................................................................................................ 12

10 TELEPHONE CHANNELS (OXYGEN 3 and 3 ST).......................................................................... 13

10.1

ALIGNEMENT OF INPUTS.......................................................................................................14

11 OUTPUT MODULES DESCRIPTION (OXYGEN 3 and 3 ST).......................................................... 15

11.1

MASTER section...................................................................................................................... 15

11.2

TALK OVER section................................................................................................................. 15

11.3

MONITOR section .................................................................................................................... 15

11.4

LED-METERS..........................................................................................................................17

12 BLOCK DIAGRAM (OXYGEN 3)..................................................................................................... 17

13 TECHNICAL SPECIFICATIONS...................................................................................................... 18

13.1

OXYGEN 3............................................................................................................................... 18

13.2

OXYGEN 3 ST..........................................................................................................................19

14 WARRANTY ................................................................................................................................... 19

Pag. 3

SAFETY INSTRUCTIONS

ENG

2 SAFETY INSTRUCTIONS

Read instructions: Retain these safety and operating instructions for future reference. Adhere to all

warnings printed here and on the console power unit. Follow the operating instructions printed in this
operating manual.

Do not remove cove rs: Operate t he power unit with its cov ers correctl y fitted. Ref er any servic e work

to competent technic al personnel only.

Power sources: Connect the power unit to a mains power only of the type descri bed in this Operating

manual and marked on t he rear panel . Use the AC cord provi ded wit h the c onsole. If the prov ided plug does
not fit into your outlet consult your service agent f or assistanc e.

Power co rd ro uting : Route the power cord so that it is not likely to be walk ed on, stretc hed or pinched

by items placed upon or against it.

Grounding: Do not defeat the grounding and polarisati on means of the po wer cord pl ug. Do not rem ove

or tamper with the ground c onnec tion in the power cord.

Water and moisture: To reduce the risk of fire or elect ric shock do not expose the power unit or consol e

to rain or m oisture or use it in damp or wet conditions. Do not pl ace containers of liqui ds on it which might
spill into any openings.

Ventilation: Do not obstruct the ventilati on slots or positi on the console or power unit where the air fl ow

required for ventilation is impeded.

Environment: Protect from excessive dirt, dust, heat and vibration when operating and storing. Av oid

tobacco ash, sm oke, dri nks spill age, and ex posure to r ai n and m oi sture. If the console becomes wet , s witc h
off and remove mai ns power imm ediately. Refer servicing to qualified technical personnel only .

Servicing: S witch off t he equipment and unplug t he power cord i mmediatel y if it is ex posed to moistur e,

spilled li quid, objects f allen into the openi ngs, the power cord or plug become dam aged, during li ghtening
storms, or if smok e, odour or noise i s noticed. Refer servicing to qualified technical personnel only.

Installation: Install the console in ac cordance with the instructions print ed in this Operating Manual. Do

not connect the output of power am plifiers directly to t he console. Use connect ors only for thei r intended
purpose.

Damage: To prevent damage to t he controls and cosmetics av oid placing heav y objects on the control

surface, scratching the surface with sharp objec ts, or subjecting the console to rough handling and vibration.

Radiation: To avoi d induced noise and interf erence pickup do not operat e the console close to strong

sources of electromagnetic radiation such as power suppl ies, lighting cables and dimm ers.

Cleaning: Avoid the use of chemical s, abrasives or solvents. The cont rol panel is best cleaned wit h a sof t

brush and dry li nt-f ree cloth. Do not leave mar king t ape stuck to the con sole for long peri ods of tim e as the
adhesive can degrade and leave a sticky residue. T he faders, switches and potenti o meters are lubricated for
life. The use of electrical lubricants on these parts is not rec ommended.

Transporting: The console should be transported i n the original pac ki ng. Protect the contr ol surface from

damage during t ransit. The console is a lar ge and heav y it em. To avoid injur y ensure adequate m an power
and precaution when lifting or moving the console.

This manual images could differ a bit from Yr Oxygen 3 real design.

Pag. 4

OXYGEN 3 SERIES - OVERVIEW

ENG

3 OXYGEN 3 SERIES - OVERVIEW

Oxygen 3 quality. The Ox ygen 3 and 3 S T are sp eci ally designed On- Ai r broadc ast consoles. Al t hough

the design has been carefully budgeted, no compromises has been made in either quality or features.
Electronic components have been selected from the best on the market. Faders, potentiometers and
switches are by ALPS. Most al l of t he swit ches hav e led indi cat ors and all simil ar func tions are groupe d an d
colour coded, with additional fader knobs with different channel colour coding. Long throw faders give a
smooth, repeatable response. Tel ephone module features a built-in, high quality telephone hybrid. Wood
finishing t ouc h ar e also available on request.

Self Co nta ined . The Oxygen 3 and 3 S T are com plete and sel f c ontained pieces of hardware, requi ring

no additonal items in order to be operated. All relevent functions are buil t-in
and ‘On Air lamp’ control (facility available on series on the Channel 1 module and, as an option, on
Channels 2 and 3).

Two versions. Oxygen 3 console is available in two versions: with or without EQ controls on Input

channels (respectively called Oxygen 3 and Oxygen 3 S T).
Each console has always two balanced outputs (Out 1 and Out2) plus a number of unbalanced outputs

provided on Pin Rca c onnec tors.
Furthermor e, while the Oxygen 3 features unbalanced LINE inputs (PinRca connect or s), the Oxygen 3 ST
features elect r onically balanced LINE inputs on Jack 1/4” female connectors.

AVAILABLE OPTIONAL ACCESSORIES (OXYGEN 3 and OXYGEN 3 ST)

Item Description

, such as Monit or speaker muting

- WOOD Wood finishing touch

- CUT Slider feat uring Monitor cut-off facility (to be fit ted into Mono channels 2 or 3)

- KSL ALPS K series sliders (for all input channels)

- ADPT SubD / 4 XLR adapter for balanced Master outputs

The Oxygen 3 with food finishin g t o uc h option

Pag. 5

OXYGEN 3 – AUDIO INPUT CONNECTIONS

4 OXYGEN 3 – A UDIO INPUT CONNECTIONS

4.1 CH 1 to 3

The first three channels feature two selectable inputs:

- INPUT A: i nput for MICROPHONE signal, electronically

balanced on XLR female

- INPUT B (PIN RCA): LINE input.

ENG

4.2 CH 4 and 5

The channels feature two selectable inputs:

- INPUT A (PIN RCA): LINE input.

- INPUT B (PIN RCA): LINE input

(the A input can be set, if required

, as PHONO, too).

4.3 CH 6

The channel featur es two select able inputs:

- INPUT A (PIN RCA): PHONO input

(Phono configuration is suitable for record-players, as a RIAA equalization is featured.
NOTE: connection is possible only in unbalanced mode).

- INPUT B (PIN RCA): LINE input

(the A input can be set, if required, as LINE, too).

Pag. 6

OXYGEN 3 ST – AUDIO INPUT CONNECTIONS

5 OXYGEN 3 ST – AUDIO INPUT CONNECTIONS

ENG

5.1 CH 1, 2 and 3

The first three channels feature two selectable inputs:

- INPUT A: stereo LINE input electronically balanced on Jack 1/4” female.

- INPUT B: mono input for MICROPHONE signal, electronic ally balanced on XLR female

1 Ground
2 Signal
3 Return

Ground Ground
Ring Return

Tip Signal

5.2 CH 4, 5 and 6

The channels feature two selectable stereo inputs:

- INPUT A: LINE input electronically balanced on J ac k 1/4” f em ale

- INPUT B: LINE input unbalanced (PinRca connectors)

NOTE: the Oxygen 3 ST com es from the fact ory with the CHANNEL 6 / INPUT B set as PHONO input (i.e.
suitable for record-players / turntables). CHANNELS 4 and 5 / INPUT B are set by default for LINE signals.

However, Input B configuration on Channels 4, 5 and 6 m ay be altered via internal jumpers, accordingly to
the following scheme:

Pag. 7

TELEPHONE CONNECTIONS (OXYGEN 3 and 3 ST)

ENG

Jumper setting LINE / PHONO on the INPUT B / Channel 4, 5 & 6 Stereo input board (Oxygen 3 ST)

6 TELEPHONE CONNECTIONS (OXYGEN 3 and 3 ST)

The Telephone modul e features a built-in telephone hybrid.
The audio sent to t he tel ephone call er is a mix -minus ( N-1). The m ix minus signal is the program m e output
signal with t he phone si gnal ( c aller’s voice) removed.

Connections:
LINE: RJ11 socket for telephone line connecti on
NOTE: Oxygen 3 and 3 ST hybrids operate on standard POTS (Plain Old Telephone Service) / PSTN

(Public Switched Telephone Network) analog tel ephone lines. Automatic line compensat ion is featured.
TEL / PHONE socket: allows the connection on par all el

Please note that this socket is always active (i.e. it doesn’t depend on the ‘Hook’ button
The two RJ11 connectors will accept 4 conductor modul ar plugs, but onl y the 2 cent ral conduc tors

Red & Green ) are used.
R/L (OUT REC on PIN RCA): double mono

SEND or RECEIVE signals).
CALL (terminal board connector): connector for ex ternal call signalling. A phot ocoupler inside the module

closes when a telephone call comes (ring).
NOTE: Typical curr ent allowed on the photocoupler: 5 mA (max 10 mA). Max voltage allowed: 15 V.

output which allows recording of the telephone calls (either

of a external telephone set ( f. i. f or dialli ng servi ces).

).

(typically

Pag. 8

OUTPUT CONNECTIONS (OXYGEN 3 and 3 ST)

ENG

7 OUTPUT CONNECTIONS (OXYGEN 3 and 3 ST)

7.1 MASTER outputs

The Oxygen 3’s Master section gives the operator an extensive set of resources.
In addition to two Master bal anced output s (Out 1 and Out 2, carried on DB15 f emale connector), pr ovision

has been made for an unbalanced, level-controlled output on PinRca connector (Out 3), an unbalanced,
fixed level on Pi nRca connector (Fixed) and two Mono outputs (summi ng the left and ri ght channels and
dropping the level by 6dB). All the Master outputs provide the sam e M aster si gnal.

OUTPUT OVERVIEW

Out 1 Balanced stereo O utput (with Level and Balance controls) DB 15p female
Out 2 Balanced stereo O utput (with Level and Balance controls) DB15p female
Out 3 Unbalanced stereo Output (with Level and Balance controls) PinRca
Fixed Unbalanced stereo Output (with Balance contr ol) PinRca
Mono Unbalanced mono Output PinRca

Pag. 9

OUTPUT CONNECTIONS (OXYGEN 3 and 3 ST)

ENG

7.2 MONITOR OUT and EXT-IN connections (OXYGEN 3 and 3 ST)

The Oxygen 3’s Monitor secti on gives the operator an extensive set of resources.
In addition to monitoring the Master and PFL audio buses, provision has been made for monitoring an

external audi o source. This stereo input (Ext -In) is intended to be connected to mi crowave, FM or satellite
receivers or anot her studio.

MONITOR output is a stereo line-lev el output, provided f or connection to a power amplifi er associated with
loudspeakers.

A selectiv e ‘muting’ of Monitor speakers is also provi ded on series. W hen microphone 1 is live to air, the
monitor speakers i n the room containing the microphone wil l be muted

Oxygen 3 and O xygen 3 ST come from th e factory with Muting facility associated to Slid er opening
on Channel 1. On request, this faci lity may be exten ded to Input ch annels 2 and 3, too (by means of
regular slid er replacement – ref to par. 3 - Options)

The slider opening on Channel 1 is also associated to a photocupler closing on TB
SubD 9 pin connector. This photocoupler may be used to control an On Air Lamp (such as MR.
LIGHT by A x e l Technology ).

MONITOR MODULE – CONNECTIONS OVERVIEW

MONITOR OUT Unbalanced stereo PIN RCA
EXT IN Unbalanced stereo Input PIN RCA
POWER External A C adapter SubD 9p male
TALKBACK Unbalanced TALKBACK / MASTER Output (switched) + OnAir

Light contr ol

TALKBACK Connector PinOut:

Pin 1 ‘On Air’ photocoupler - Collector
Pin 2 Not connected
Pin 3 Ground GND
Pin 4 TB / MASTER output Right
Pin 5 TB / MASTER output Left
Pin 6 ‘On Air’ photocoupler - Emitter
Pin 7 Not connected
Pin 8 Ground GND
Pin 9 Ground GND

so that there is no acoustic feedback .

(TALKBACK)

SubD 9p female

7.3 LED-METERS

SubD 15 P male connector for led-meters connection.

Pag. 10

OXYGEN 3 – INPUT MODULE DESCRIPTION

ENG

8 OXYGEN 3 – INPUT MODULE DESCRIPTION

8.1 CHANNELS 1 to 6

A/B SWITCH: The B SEL switch selects the INPUT B socket when depressed and the

INPUT A when released. A LED gl ows green when the INPUT B is selected. Input A is set
for Micro level on Channel s 1 to 3, for Line lev el on the Channels 4 and 5 and for Phono
level on the Channel 6 if not ot her wi se i ndicated.

GAIN: The GAIN potentiomet er provides a v ariabl e 24dB range (f rom -12 to + 12dB) gai n to
match the connected source to the internal 0 dBu operating lev el
This knob allows you to match the input level to suit a wide variety of professional and
semiprofessional sources. Start with a low setting, especially for professional equipment,
checking the level on the meters using PFL, and increase it if y ou c annot reach an average 0
dB level with the f ader at m aximum (refer also to section 10.1).

EQUALISER: The Equaliser comprises three sections. The upper control provides
H.F.(treble) boost and cut of + 6 / -12 dB at 13 kHz, and the lower control provides L.F.
(bass) boost and cut of + 6 / -12 dB at 60 Hz.
The centre knob i s arranged a s MID f requenc y secti on, with a c ut/ boost contr ol ( l ower knob)
of + 6 / - 12 dB for a frequency range from 80Hz t o 10 kHz.
Set the cut/boost c ontrol of each section to the centre-detented posi tion when not required.

MASTER: The input channel signal may be routed to the main S tereo MIX (MASTER L / R)
by pressing the Master swit c h.
There is a green LED inside whic h will illuminate accordingl y.

PFL: Stereo pre-f ade listening PFL button (operated onl y in latched mode) all ows pre-fade
listening (post-EQ) of the channel wit h the f ader cl osed . Even when the channel is active, the
PFL system is active. It always operates in the ADDITIVE M ode ( i.e. You can li sten to one or
more PFLs at the same time by pressing one or more PFL keys).

To listen to a PFL:

1) select the PFL key on the input channel to be monitored

2) release both the MASTE R and EXT-I N butt ons on the MONIT OR section (ref. to section 11.3)

SLIDER: ALPS N-type 90° ultra smooth 100 mm sliders are provided on series.
The scale shows the att enuation. Norm al operating position is at the top ‘0’ mark, provi ding overall 0 dB of
gain. On request, to notify at order
life.

CHANNEL 1 (label led Mi cDJ / Line) may be regar ded as a ‘priori ty’ channel : the P OST-EQ (and pre- fader)
signal is al wais inter nally routed t o the T alkB ack circuitry and t o the T el ephone channel s f or ‘priv ate’ (off -air )
communications with the callers. The Post Fader, channel Master output is also routed to the TalkOver
section f or automatic v oice/music mix. W e therefore sugge st to use the First Channel a s a ‘mi cro’ channel
connected to the DJ / Announcer mi c r ophone.

, ALPS K series sliders can be al so fitted. The benefit is longer f ader

Pag. 11

OXYGEN 3 ST – INPUT MODULE DESCRIPTION

ENG

9 OXYGEN 3 ST – INPUT MODULE DESCRIPTION

9.1 CHANNELS 1 to 6

A/B SWITCH: T he B SEL switch selec ts the INPUT B socket when depresse d and the INPUT A

when released. A LE D glows green when the INP UT B is select ed. Input B is set f or Mic ro level
on Channels 1 to 3, for Line level on t he Channels 4 a nd 5 and f or P hono lev el on t he Channel 6
if not otherwise i ndic ated.

GAIN: The GAIN potentiometer provides a variable 24dB range (from +12 to +12dB) gain to
match the connected source to the internal 0 dBu operating lev el
This knob allows you to match the input level to suit a wide variety of professional and
semiprofessional sources. Start with a low setting, especially for professional equipment,
checking the l ev el on t he m eters using PFL, and increase it if you c annot r each a n av er age 0 dB
level with the fader at maximum (refer also to section 10.1).

BALANCE: It adjusts the stereo image of the signal on the stereo line input (i.e. the balance
between the L and R output s). At t he detented cent re posit ion the si gnal rout es equall y to L and
R.

MASTER: The input channel signal m ay be routed to the main Stereo MIX (MASTER L / R) by
pressing the Master switc h.
There is a green LED inside whic h will illuminate accordingl y.

PFL: Stereo pre-fade listening PFL button (operated only in latched mode) allows pre-fade
listening (post-EQ) of the channel with the fader closed. Ev en when the channel is active, the PFL
system is activ e. It always operat es in the ADDITI VE Mode (i.e. You can l isten to one or m ore
PFLs at the same time by pressing one or mor e PFL keys).

To listen to a PFL:

1) select the PFL key on the input channel to be monitored

2) release both the MA STER and EXT-IN buttons on the MONITOR secti on (ref. to section

11.3)

SLIDER: ALPS N-type 90° ultra smoot h 100 mm sliders are provided on series.
The scale shows the attenuation. Normal operating position is at the top ‘0’ mark, providing
overall 0 dB of gain. On request, to notify at order
longer fader life

CHANNEL 1 (label led Mi cDJ / Line) may be regar ded as a ‘priori ty’ channel : the P OST-EQ (and pre- fader)
signal is al wais inter nally routed t o the T alkB ack circuitry and t o the T el ephone channel s f or ‘priv ate’ (off -air )
communications with the callers. The Post-Fader, channel Master output is also routed to the TalkOver
section f or automatic v oice/music mix. W e therefore sugge st to use the First Channel a s a ‘mi cro’ channel
connected to the DJ / Engi neer microphone.

.

, ALPS K series sliders can be also fitted. The benef it is

Pag. 12

TELEPHONE CHANNELS (OXYGEN 3 and 3 ST)

10 TELEPHONE CHANNELS (OXYGEN 3 and 3 ST)

The Telephone modul e features a built-in telephone hybrid.
The modul e featur es two gain cont rols, PFL, Master out put, hybrid Hook / Ri ng controls. It

features connections to a regular telephone line (POTS) and to an external standard
telephone set (f.i. for dialling

The audio sent to the telephone caller is a mix-minus (N-1). The mix minus signal is the
programme output si gnal with the phone signal (caller’s voice) removed.

The presenter can talk off-air with a caller (whilst t he Main programme is bei ng output) via its
own microphone (c onnec ted to Channel 1 module).

HOOK button: it allows Line hooking. This switch hooks / hangs up the hybrid from the
telephone li ne. Hook LE D switchs on accordi ngly. T he same LED blinks when a call (ring) i s
coming in. Please note: LE D glows only if phone line is connected

SEND: It adjusts in the +/- 12 dB range the level of mix-minus signal which is sent to the
telephone call er.

RECEIVE: It adjusts in t he +/- 12 dB range the level of the si gnal incoming fr om telephone
caller.

MEETING: it allows the RECEIVE signal to be heard also by the other telephone caller.
MASTER: it connects the telephone out put to the Master output. T he LED inside the button

turns on accordingly.

). Automatic line compensation is also featured.

.

ENG

PFL

When the MASTER butt on

Note: with MA S TER button enabled on Telephone channels, t he signal sent to the telephone line (adjustable
through SEND contr ol) will be the sum of the si gnals coming from each modul e routed to the Master bus
except from the two Telephone ones
MEETING functi on ( on both the Telephone modules).

SLIDER ALPS N-type 90° ultra smooth 100 mm sliders are provided on series.

Pre-fade listening PFL button (operated only in latched mode) allows a caller to listen to the
announcer/DJ mi crophone (connec ted to Channel 1) and to be heard without bei ng in the br oadcast
(i.e. with the fader closed).

When the PFL button

the channel (Rec eiv e) si gnal will be connected to the PFL output (see also MONITO R Chapter) .

-

the DJ MIC (i.e. the Mic connected to Channel 1 with A/B selection button released) is

-

automatic all y r outed to the call er for “off-air” (i.e. ‘Private’) comm unications with the engineer or the
announcer (regardl es s of MST and PFL keys on the Micro 1 channel)

the Master bus is automatically sent to the caller

-

the caller is broadcast while Telephone channel fader opened

-

is activated (with MASTER butt on deac tivated):

is activated (regardless of the PFL key):

. The mutual phone-user listening can only be enabled via the

Pag. 13

TELEPHONE CHANNELS (OXYGEN 3 and 3 ST)

The scale shows the att enuation. Norm al operating position is at the top ‘0’ mark, provi ding overall 0 dB of
gain. On request, to notify at order
and more reliable operation.

, ALPS K series sliders can be also fitted. The benef i t is longer fader life

ENG

10.1 ALIGNEMENT OF INPUTS

When plugging in a new source start with the f ader turned down and the PFL ac tivated. T he si gnal is displayed
on the meters on the left hand ( PFL) and c an be checked in the headphones or in the Monitor loudspeakers.
Adjust the channel G AIN control for an average channel meter reading of ‘0’ with loud moments lighting ‘+3’.
Reduce the gain if t he signal met er al ways ranges in t he 0 to + 3dB area. It may be nec essary to r e-adj ust t he
gain if changes are made t o the equaliser.

Pag. 14

OUTPUT MODULES DESCRIPTION (OXYGEN 3 and 3 ST)

ENG

11 OUTPUT MODULES DESCRIPTION (OXYGEN 3 and 3 ST)

11.1 MASTER section

OUTPUT 1: it controls the signal level on the output labelled OUTPUT 1 (balanc ed) .
OUTPUT 2: it controls the signal level on the output labelled OUTPUT 2 (balanc ed) .
BALANCE: it controls the signal balance on the outputs labelled OUTPUT 1-2-3 and

FIXED.
OUTPUT 3: it controls the signal level on the output output labelled OUTPUT 3

(unbalanced).

11.2 TALK OVER section

The TALK OVER section allows compression of all signals from CH 2 to 6 and of the
TELEPHONE channels in favour of CHANNEL1 (Master) output signal. It means that you can, f.i.,
automatically fade the level of music signals (from Stereo module) depending on the level of MIC1
microphone signal. This section will affect t he MASTER output s.

DEPTH: it controls the ratio of the compression: the lower is the value, the lower will be the
compressed audio level. The TALK OVE R function can be disabled by turning the DEPTH
potentiometer in position 10.

THR(ESHOLD): the trimmer inside the hole adj usts the threshold int ervention lev el of the
compressor (use a small screw-driver in order not to damage the t rimmer).

REL(EASE): adjusts the release time of compressor: the higher is the value (turn it
clockwise), the longer is the time needed to go bac k to the f ormer audio level. ( use a small
screw-driver not to damage the trimmer).

11.3 MONITOR section

The Monitor section all ows monit oring of select ed buses (Ex t In, Master , and PF L) wit hout
interferi ng with normal operation of t he main (Master) audio bus. For oper ator assistanc e,
the left pair of LED meter s al ways visualize the level of the source selected in this section

The Monitor section is capabl e of driving one pai rs of headphones plu s a Line output with
separated level c ontrols.

POWER button: it switches On / Off the console. The LED inside the button glows
accordingly.

EXT IN control: it adjusts the EXT IN input signal level (f or exampl e a tuner signal)
OUT control: It affects the (line level) Monitor output on the rear panel.
HEADPHONE control : it affects the output t o any headphones connected to the 1/ 4” jack

phones socket

Pag. 15

.

OUTPUT MODULES DESCRIPTION (OXYGEN 3 and 3 ST)

Monitor Speaker Mut e

The Mute functi on (Monitor speaker cu t off) always operat es whenever Channel 1 (MicDJ / Line) is used
(i.e. the fader is opened). This is to prevent acoustic feed-back ( e.g. using a Studio microphone).
MUTE function never aff ec ts headphone monitoring section.

SOURCE SELECTION BUTTONS

The core of the monitor section are the two monitor source buttons. The buttons allow one of the audio
sources (as well as PFL si gnal) to be selected for monitoring as the Monit or speaker source.

EXT IN
pressed

EXT IN
depressed

EXT IN

depressed

TALK BACK BUTTON

The TALK BACK button allows f. i. t he Announcer (or t he engi neer) i n the Cont rol Room to t ransmit tal kback
to the Guest headhones when the button is pressed. TalkBack circ uitry is always monodirectional

The TalBack output provides Master signal by default. Press and hold the T.B. to Studio button: it will
connect the Channel 1 audio source to the TB output (ref to Rear Panel description – Section 7.2). The
Channel 1 signal will always replace

NB The CHANNEL 1 signal routed to TB circuitry is picked-up POST-EQ and PRE-FADE R.

MASTER
depressed

MASTER
pressed

MASTER
depressed

Monitor speakers / headphones will reproduce the EXTERNAL Input signal
(f.i. a tuner)
‘

Monitor speakers / headphones will reproduce the MASTER signal

Monitor speakers / headphones will reproduce the PFL signal

the exisisting M aster signal.

ENG

.

Pag. 16

BLOCK DIAGRAM (OXYGEN 3)

ENG

11.4 LED-METERS

The Oxygen 3 and Oxyg en 3 ST mixers are fitted with VU / PEAK LED meters.
VU meters respond to an average signal lev el, whereas PEAK LED glows when the 0dB threshold is over-

passed (it remains ‘on’ l ong enough to provide easy recognition).
The VU meters are fact or y-calibrated and no further user adjustement is allowed

A short cable wit h a 9 pins subD plug on each end (m ale and f emale) comes with t he console. I t is used to
connect the meterbridge to the mixer.

The RIGHT pair of meters always display the Master signal.

The LEFT pair of meters show any combination of the MASTER output, the EXTERNAL input or PFL
output is selected on th e Monito r modu le.

For example, if Monit or section has MAST ER selected, then the m eters will display the MASTER signal. Of
course, meters will also display the PFL signal, if PFL listening is selected (see par. 11.3)

.

12 BLOCK DIAGRAM (OXYGEN 3)

Pag. 17

TECHNICAL SPECIFICATIONS

ENG

13 TECHNICAL SPECIFICATIONS

13.1 OXYGEN 3

LINE-LINE & LINE – PHONO STEREO MODULE

INPUT A Stereo Pi nRCA
INPUT A levels 0 dBm (LINE – Channels 4 - 5) Unbal -12 to +12 dB gain control
Phono (RIAA – Channel 6) Unbal -12 to +12 dB gain control
INPUT A impedance (line) 10 kOhm

INPUT B Stereo Unbal PinRCA
INPUT B nominal level 0 dBm (LINE) -12 to +12 dB gain control
INPUT B impedance 10 kOhm

MONO/STEREO MODULE

INPUT A Mono El. Bal. XLR
INPUT A nominal level - 70 dB (MICRO level) -12 to +12 dB gain control
INPUT A impedance > 1,5 kOhm

INPUT B Stereo Unbal PinRCA
INPUT B nominal level 0 dBm (LINE) -12 to +12 dB gain control
INPUT B impedance 10 kOhm

TELEPHONE MODULE

SEND / RECEIVE separ.
In / out level on tel. line - 6 dBm on 600 Ohm line imped.
Compensation mode Electronic / automatic
Line connection 2 wire, RJ11 connector
REC outputs Unbal PinRCA 0 dB level

MASTER MODULE

MASTER Output 1 & 2 Stereo El. Bal. SubD 15P - inf to + 6 dB control
MASTER Output 3 and Fixed Stereo Unbal. PinRCA
MASTER Mono Outputs Mono Unbal PinRCA 0 dBm

Nominal MST Output Level 0 dBu (LINE)
MST output Impedance 100 Ohm

MONITOR MODULE

TUNER IN Stereo Line Unbal PinRCA - inf to + 6 dB gain control
MONITOR Output Spk - Stereo Line Unbal. PinRCA -inf to + 6 dBm
Phones - Stereo Line Unbal. Jack 1/4” -inf to +12 dBm
TALKBACK Output Spk - Stereo Line Unbal. SubD 9p

GENERAL

AC VOLTAGE 90 / 260V ( 50 – 60 Hz) - switching power supply
POWER CONSUMPTION 20 W
DIMENSIONS 178 mm (h) x 483 mm (w) x 340 mm (d).
WEIGHT Around 5 Kg

20 dB**

** it ca n vary depending on telephone line characteri stics

- inf to + 6 dB control (Out

3)

Pag. 18

WARRANTY

ENG

13.2 OXYGEN 3 ST

LINE-LINE & LINE – PHONO STEREO MODULE

INPUT A Stereo El Bal J ac k 1/4”
INPUT A nominal level 0 dBm (LINE) -12 to +12 dB gain control
INPUT A impedance 10 kOhm

INPUT B Stereo Pi nRCA
INPUT B levels 0 dBm (LINE – Channels 4 - 5) Unbal -12 to +12 dB gain control
Phono (RIAA – Channel 6) Unbal -12 to +12 dB gain control
INPUT B line impedance 10 kOhm

MONO/STEREO MODULE

INPUT A Stereo El Bal J ac k 1/4”
INPUT A nominal level 0 dBm (LINE) -12 to +12 dB gain control
INPUT A impedance 10 kOhm

INPUT B Mono El. Bal. XLR
INPUT B nominal level - 70 dB (MICRO level) -12 to +12 dB gain control
INPUT B impedance > 1,5 kOhm

TELEPHONE MODULE

SEND / RECEIVE separ.
In / out level on tel. line - 6 dBm on 600 Ohm line imped.
Compensation mode Electronic / automatic
Line connection 2 wire, RJ11 connector
REC Tel output Unbal PinRCA 0 dB level

MASTER MODULE

MASTER Output 1 & 2 Stereo El. Bal. SubD 15P - inf to + 6 dB control
MASTER Output 3 and Fixed Stereo Unbal. PinRCA
MASTER Mono Outputs Mono Unbal PinRCA 0 dBm

Nominal MST Output Level 0 dBu (LINE)
MST output Impedance 100 Ohm

MONITOR MODULE

TUNER IN Stereo Line Unbal PinRCA - inf to + 6 dB gain control
MONITOR Output Spk (Stereo Line) Unbal. PinRCA -inf to + 6 dBm
Phones Unbal. Jack 1/4” -inf to +12 dBm
TALKBACK Output Spk - Stereo Line Unbal. SubD 9p

GENERAL

AC VOLTAGE 90 / 260V ( 50 – 60 Hz) - switching power supply
POWER CONSUMPTION 20 W
DIMENSIONS 178 mm (h) x 483 mm (w) x 340 mm (d).
WEIGHT Around 5 Kg

20 dB**

** it ca n vary depending on telephone line characteri stics

- inf to + 6 dB control (Out

3)

14 WARRANTY

The warranty covered by AXEL TECHNOLOGY S.R.L. has 1 year validity ex- work.
Do not open the equipment without bei ng previously authori sed by AXEL TECHNOLOGY, in case of seal
breaking the warrant y will expire.
AXEL TECHNOLOGY will not be responsible for any dam age, of any origin, caused or rel ated to an incorrect
use of the product.

Pag. 19