KV2 Audio SDD3 User manual

The future of sound.
Made perfectly clear.
At KV2 Audio our vision is to constantly develop
technologies that eliminate distortion and
loss of information providing a true dynamic
representation of the source.
Our aim is to create audio products that absorb
you, place you within the performance and deliver
a listening experience beyond expectation.
SDD3
User Guide

Contents
Introduction
How to use this manual 4
Icons used 4
Important safety instructions 4
Introducing the SDD3 5
Getting Started
Unpacking 6
Rack mounting 6
AC Power requirements 6
Voltage requirements 6
Connector wiring 6
Features
Front Panel 7
Rear Panel 9
Using the system
Delay for additional PA 10
Delay for main PA 11
SDD3 Setup
LEVEL 12
DELAY 12
MENU 13
Units mode 13
Subwoofer mode 13
Memory 15
Lock 16
Display 17
Temperature 17
Block Diagram 18
Dimensions 19
Input and Output Cables 20
Specication 21
Warranty, Service 22
Page | 3

NOTE
!
CAUTION
C
!
14. Unplug SDD3 during lightning storms
or when unused for long periods of time.
15. Refer all servicing to qualified service
personnel. Servicing is required when the
SDD3 has been damaged in any way, such
as when the power-supply cord or plug
has been damaged; liquid has been spilled
or objects have fallen into the SDD3; rain
or moisture has entered the SDD3; the
SDD3 has been dropped; or when for
undetermined reasons the SDD3 does not
operate normally.
16. Do not remove top or bottom covers.
Removal of the cover will expose
hazardous voltages. There are no user
serviceable parts inside and removable
may void the warranty.
17. An experienced user shall always supervise
this professional audio equipment.
How to use this manual
As you read this manual, you’ll find figures
and diagrams to help you understand and
visualise what you’re reading. You’ll also find
numerous icons that serve as cues to flag
important information or warn you against
improper or potentially harmful activities.
Icons used include
Introduction
“NOTE” identifies an
important or useful piece
of information relating to
the topic under discussion.
“CAUTION” gives notice
that an action can have
serious consequences and
could cause harm to
equipment or personnel,
delays, or other problems.
Important safety instructions
1 Read all product instructions.
2. Keep printed instructions, do not throw
away.
3. Respect and review all warnings.
4. Follow all instructions.
5. Do not use this unit near water, in
unprotected out door areas or in rain
or wet conditions.
6. Clean only with dry cloth.
7. Do not block any ventilation openings.
8. Install in accordance with KV2 Audio's
recommended installation instructions.
9. Do not install near any heat sources such
as heat radiators, heat registers, stoves
or other apparatus that produce heat.
10. Do not defeat the safety purpose of the
grounding type plug. A grounding type
plug has two blades and a third grounding
connector. The third connector is
provided for your safety.
If the provided plug does not fit into your
outlet, consult an electrician for
replacement of the obsolete outlet.
11. Protect the power cord from being walked
on or pinched, particularly at plugs,
convenience receptacles and the point
where they exit from the SDD3. The AC
mains plug or appliance coupler shall
remain readily accessible for operation.
12. Only use a ccessories specified by
KV2 Audio.
13. The unit is intended for use in a 19” rack.
Follow the mounting instructions.
CAUTION:
Installation should only be done
by experienced professionals.
!
CAUTION
Page | 4

Introducing the SDD3
The SDD3 is a 2 channel full range stereo audio
delay line, with one dedicated channel subwoo-
fer delay line.
Full range channels are specically for delaying
audio signals for main PA systems or side lls,
with a maximum delay time of 393,216ms
(approx 134m / 442ft).
Each channel is equipped with a tunable high
pass lter for easy side lls setup.
The full range channels use super digital tech-
nology with wide bandwidth and enhanced
dynamic range. For optimal analog to digital
converter driving, the full range channels are
equipped with ADC sensitivity control, which
increases input level and reduces output level
at the same time, so the level pass in the SDD3
does not change when adjusting the ADC
sensitivity. The input level can be seen on the
level meters. Output level can be set in the
range from -10 to +10dB.
The subwoofer channel is dedicated for
delaying subwoofers with a bandwidth of
0 ÷ 120Hz and maximum delay time of 10ms
(approx 3,43m / 11,25ft).
The subwoofer channel has two independent
outputs which can be linked together for easy
cardioid setup. The subwoofer channel is
designed like a digitally controlled analog unit.
The output level can be set in the range from
-10 to +10dB.
Each audio input has parallel outputs for easy
audio device branching. Each audio output
features line drivers to maintain audio signal
integrity over long cable lengths. Each output is
equipped with a phase reverse switch and a
true bypass feature. When the device is swit-
ched o, all channels are bypassed.
Introduction
NOTE:
For the best performance, where
possible use only KV2 Audio
components, any other compo-
nent may negatively aect the
sound quality.
Page | 5
NOTE:
SDD3 has the same dimensions as
the KV2 audio SAC2 crossover.

Unpacking
Unpack the SDD3 and check to see if there is
any damage to it. If you nd any damage notify
your supplier immediately. Only the consignee
may institute a claim with the carrier for any
damage incurred during shipping. Be sure to
save the carton and all packaging materials for
the carrier’s inspection.
Should you ever need to ship the unit, only use
the original factory packaging. If the shipping
carton is unavailable, contact your supplier to
obtain a replacement.
The SDD3 carton should contain:
t4%%4VQFS%JHJUBM"VEJP%FMBZ
t6TFS(VJEF
t*&$1PXFS$BCMF
Rack mounting
The SDD3 will mount in a standard 19” rack
system. Use four screws and washers to mount
the SDD3 to the rack rails. We recommend
using a shock-mounted rack for touring use to
prolong the life of your SDD3.
To prevent accidental adjustment of settings, or
unwanted tampering in a xed installation,
,7"VEJPQSPWJEFBOBEEJUJPOBMTFDVSJUZQBOFM
as an accessory.
AC Power requirements
5IF4%%VTFTBTUBOEBSE*&$QPMF"$
connector. The device must be connected to a
mains socket outlet with protective earthing
connection. The SDD3 operates in either 115V
or 230V mode. This setup is precongured at
the factory. The mains plug of the power supply
cord shall remain readily operable.
Getting started
Voltage requirements
The SDD3 operates safely and without audio
EJTDPOUJOVJUZJGUIF"$WPMUBHFTUBZTXJUIJOUIF
operating window of 90V÷130V in 115V mode
or 180V÷260V when working in 230V mode at
50 or 60Hz.
Input Output
12
3
21
3
(SPVOE
2 = Hot (+)
$PME
Connector wiring
XLR Balanced Input and Output connectors
$"65*0/
*GUIFBOZ-&%EPFTOPUJMMVNJOBUF
or the system does not respond to
BVEJPJOQVUSFNPWF"$QPXFS
immediately. Verify that the volta-
ge is within the proper range. If the
problem persists, please contact
,7"VEJPPSBOBVUIPSJ[FETFSWJDF
center.
$"65*0/
If it is necessary to convert balan-
ced output to unbalanced, it is
impossible to short Hot(2) or
$PMEQJOTXJUI(SPVOEIn
this event the Line Drivers will
cause permanent disconnection.
For more information please refer
to page 20.
1Bge | 6

Channel A and B
ADC sensitivity
For optimal analog to digital converter driving, the full range
channels (A and B) are equipped with ADC sensitivity control
which increases input level and reduces output level at the same
time, so the level pass in the SDD3 does not change when
adjustings the ADC sensitivity. The input level can be seen on
the level meters. For optimal ADC driving run the level meters so
that the signal will exceed 0dB meter level, but never reaches
clip level.
High Pass Filter
The full range channels (A and B) are equipped with a tunable high pass lter lter from 0 to 160Hz. It has
a slope of 12dB/octave and it is used for easy and optimal setup for side lls, or to protect your subwoo-
fer system from the frequencies that cannot reproduce eciently and may cause damage.
Output level
The output level can be set in range from -10 to +10dB.
Phase
Each output is equipped with a phase reverse switch, which reverses the phase of the output signal.
Features
Front Panel
Page | 7
Subwoofer channel C
Output level
The output level can be set in range from -10 to +10dB.
Phase
Each output is equipped with a phase reverse switch, which
reverses the phase of the output signal.

Display
Indicates the input levels for each channel
separately. Shows the set delays and allows
settings of various functions in the menu
Function / Exit button
Allows the operator to toggle between three main screeens - LEVELS, DELAY, MENU. When you are
inside the menu, the button serves as exit.
Channel / Next button
This button switches between channels, the selected channel is indicated by green LED indicators.
When you are inside the menu, this button serves as a skip to the next menu item.
Rotation encoder with Enter pustbutton
The encoder serves as the main way for increasing (clockwise), or decreasing (counterclockwise) values
and menu positions. The encoder also serves as the ENTER button, alloving the operator to enter/leave
the submenu in the main menu. When the DELAY main screen is selected, the Enter button changes the
math point digits.
Bypass button
When the bypass button is pressed, all channels are bypassed, (true bypass). When bypassed, the functi-
on is indicated by the red LED light above this button.
Features
Front Panel
Page | 8

POWER CONNECTION
Plug power connector
For connection to a standard IEC 3-pole AC connector.
Before connecting make sure that the mains voltage
corresponds to the SDD3's voltage requirements as stated
on the unit.
Features
Rear Panel
Page | 9
Power switch
Used to turn the SDD3 on or o.
SUBWOOFER CHANNEL CONNECTORS
Input
Balanced female - XLR connector for connecting the
subwoofer signal. The audio input circuit presents a 20kΩ
balanced input impedance.
Output
The through / output balanced male - XLR connector, wired in parrallel to the audio input, will continue
to provide the input signal if the SDD is turned o.
Delay output
Two separated subwoofer outputs with balanced male - XLR connectors. The max. allowed output
frequency is 120Hz. When using the subwoofer channel in normal mode SUB1 and SUB2 delay outputs
are separated. When using the subwoofer channel in cardioid mode, output SUB1/FRONT serves as the
front subwoofer output and SUB2/REAR serves as the rear cardioid subwoofer output. In cardioid mode
the delay setup is linked together for determined and easy cardioid setup. For more information about
cardioid setup, please refer to the Cardioid setup part of this guide.
Output
The through / output balanced male - XLR connector, wired in parrallel to the audio input, will continue
to provide the input signal if the SDD is turned o.
Delay output
Delayed output with balanced male - XLR connectors.
Reset
Pressing this button resets the SDD3 to factory setup.
FULL RANGE CHANNELS (A and B) CONNECTORS
Input
Balanced female - XLR connector for connecting full range
signal. The audio input circuit presents a 20kΩ balanced
input impedance.

Delay for additional PA / ll-in delay, with mono cardioid subwoofers in center
The main PA works directly, without delay. The left and right channel of the secondary, or side-ll PA
works through the full range channels of the SDD3, (channel A and B) for proper time alingment with the
main PA. Subwoofers are in the center and work in mono, cardioid mode.
When using this system, it is possible to move in time (change the distance) of sidells and the mono
subwoofers in cardioid mode compared to the main PA.
Using the System
Page | 10
0 m 1 m
0,75 m 2 m 1,4 m 3 m
Main PA
Secondary PA
or Side-ll
(60Hz) wavelenght / 4
Front Sub
(delayed) Rear Sub
STAGE
right
left
right
left
right
input left
input
subwoofer
input
STAGE
Main PA Main PA
Side-ll
left Cardioid
subwoofers
System with mono subwoofers - top view System with mono subwoofers - wiring
Side-ll
right

Using the System
Page | 11
Delay for main mono PA, delay for additional PA / mono ll-in delay, with stereo cardioid
One SDD3 controls one channel of the system, the second channel controls the second SDD3 unit.
The main PA works through SDD3 channel A to delay the PA for optimal time alingment with the stage
position. The secondary, or side-ll PA works through the full range channel B of SDD3 for proper time
alingment with the main PA. Subwoofers work in stereo, cardioid or normal mode.
When using this system, it is possible to move separately in time, (change distance) of the main PA,
sidells and subwoofers compared to the stage position.
0 m 1 m
0,75 m 2 m 1,4 m 3 m
Main PA
Secondary PA
or Side-ll
(60Hz) wavelenght / 4
Front Sub
(delayed) Rear Sub
STAGE
right
input left
input
subwoofer
input
STAGE
Main PA
Secondary PA
Cardioid
subwoofers
Stereo delayed system - top view Stereo delayed system - wiring
Main PA
Secondary PA
Cardioid
subwoofers

Digital part description
The SDD3 has three main display screens for setup and input levels indication. Main screens are: LEVEL -
for input levels indications, DELAY for delay setup and MENU for attributes settings. For switching
between these screens use FUNC/EXIT button.
SDD3 Setup
Page | 12
LEVEL MENU
A
B
S
-24 -18 -12 -6 0dB +6 CLIP
DELAY
LEVEL MENU
A:
B:
DELAY
SUB1:
SUB2:
000.012 ms
00.31 ms
00.31 ms
000.012ms
LEVEL
For optimal analog to digital converter driving
the full range channels (channel A and B) are
equipped with ADC sensitivity control which
increases input level and reduces output level
at the same time, so the level pass in the SDD3
is not changing when adjusting the ADC sensi-
tivity. ADC sensitivity allows the optimal setup
of signal to noise ratio. The input level can be
seen on the input level meters indicators. For
optimal ADC driving run the level meters so
that the signal will exceed 0dB meter level, but
never reaches clip level. Level meters are
equipped with peak memory and 2 seconds
auto reset.
DELAY
Delay can be set for each channel individually,
delays can be set in time or distance. Required
delay is set by changing numbers on math
point position. Delay numbers are changed by
rotating the rotary encoder. Math position is
changed by pushing the rotary encoder
(ENTER). Delay changes are reected in real
time.
The current selected channel can be switched
by pressing CHAN/NEXT button. The selected
channel is incicated by an LED.
The subwoofer channel can be set in 32 xed
steps, with step increments of 0.31ms. The
subwoofer channel has two outputs, these
outputs can be set individually in normal mode
or linked in cardioid mode.
In normal mode, delay can be set in time or
distance, in cardioid mode, delays are set in
distance. The distance between the front and
rear cardioid subwoofer is precalculated by a
set cardioid frequency. Cardioid frequency can
be set in the range of 40 to 100Hz. In cardioid
mode cardioid delay is set for the entire cardi-
oid pair.
LEVEL MENU
A:
B:
DELAY
FRONT:
REAR:
000.012 ms
01.50 m
000.012 ms
00.10 m
Frequency: 60Hz
DELAY screen
DELAY screen - cardioid
LEVEL screen

SDD3 Setup
MENU
Units mode
Delay mode
Delay can be set in time (miliseconds) or in distance
(meters or feets depending on Units setup). When
switching between time and distance, the delay time
is kept and recalculated to each other. The delay
distance depends on the ambient temperature.
Units
It is possible to switch between metric (meters, °C )
and imperial (feet, °F) units, when switching between
each other, the distance is maintained.
Link AB
It is possible to link channel A and B delay setup,
when both delays are the same. When switching to
Link AB, the delay of both channels is set by
channel A.
LEVEL
Delay mode
Units mode:
Units
DELAY MENU
Units mode: Delay mode
time( )
( )metric
Link AB ( )no
Cardioid polar characteristics
LEVEL
Units mode
Subwoofer mode
DELAY
Memory
Lock
Display
Temperature
MENU
MENU screen - Subwoofer mode
Page | 13
LEVEL
Units mode
Subwoofer mode
DELAY
Memory
MENU
MENU screen - Units mode
Lock
Display
Temperature
Subwoofer mode
Cardioid setup
Bass is usually omnidirectional but by using a cardi-
oid bass array you can reduce bass feedback on
stage and also minimise noise pollution from events.
When using cardioid mode, the front subwoofer is
1/4 wavelength of the tuned cardioid frequency in
front of the rear subwoofer. The front subwoofer is
fed with a 1/4 wavelength delay compared to the
rear sub. This conguration results in a cardioid
polar response ,(because of addition and subtraction
of the subwoofer signals).
Cardioid calculation - example
Subwoofers distance (d) corresponds to 1/4
wavelength (λ) of the tuned cardioid frequency
(f).
Speed of sound (v) varies with temperature, for
20°C is approx 343m/s.
λ = 1 / 4f
d = v * λ
FRONT
SUB
REAR
SUB

Subwoofer mode
For cardioid setup, you can calculate and set the
delay for each subwoofer manually, or you can use
cardioid setup in the SDD3 menu.
For manual - idependent sub outputs setup, use the
normal mode. For cardioid setup use the cardioid
mode. When cardioid mode is selected, the
subwoofer outputs are linked together with λ/4
distance between front and rear subwoofer outputs.
In cardioid mode, the selected cardioid tuned
frequency can be operated in range from 40Hz to
120Hz with 10Hz steps.
The subwoofer pair's polar characteristics are cardi-
oid on this frequency, whilst uder and above this
frequency the polar characteristics of the subwoofer
pair are omnidirectional with increasing dierence
from cardioid frequency. The cardioid distance is
shown on the cardioid frequency setup screen.
0 m 1 m
0,75 m 2 m 1,4 m
Cardioid frequency
Front Sub
(λ/4 delayed) Rear Sub STAGE
subwoofer input
LEVEL
Mode
Subwoofer mode:
Subs distance: 1,04m
Frequency
DELAY MENU
MENU screen - Delay mode
Cardioid subwoofers wiring
cardioid( )
( )60Hz
Page | 14
SDD3 Setup

Memory
New memory
SDD3 is equipped with a dynamic memory list with
up to 30 memory positions. New memory can be
created when pressing ENTER at New in the memory
list.
When a new memory is created, it is marked with a
position number from 1 to 30 whilst the memory
function select is switched to the rename position.
Rename memory
Memory name can contain up to 8 letters, space or
numbers. To rename a memory select the memory
position to rename and select rename at the
memory function list, press ENTER.
When renaming, the renaming letter ashes, select
the required letter by rotating the encoder. Switch
between A - Z, a - z , spacebar 1 - 9 using
CHAN/NEXT button.
To jump to the next letter position, press ENTER.
To exit renaming press FUNC/EXIT button.
When new memory is created the actual setup is
automatically saved.
Save to memory
All delays, units, delay mode, and cardioid setup are
saved into the memory.
To save to memory, select the memory position to
save in and select save from the memory function
list, press ENTER. When saved, the memory
number, is shown in the top right corner.
Memory recall
To recall from memory, select the memory position
to recall and select recall at the memory function
list, press ENTER.
When recalled, the memory number, is shown in
the top right corner.
Delete memory
To delete a memory, select the memory position to
delete and select delete in the memory function list,
press ENTER.
LEVEL
1 Hall
Memory:
New
DELAY MENU
Memory : New memory
( )rename
LEVEL
1 Hall
Memory:
New
DELAY MENU
M1
Recalled or saved memory is displayed
in right top corner
( )recall
LEVEL
Units mode
Subwoofer mode
DELAY
Memory
MENU
MENU screen - Memory
Page | 15
Lock
Display
Temperature
SDD3 Setup

Page | 16
Lock
The SDD3 is equipped with an option to lock the
setup of the dital control part. The SDD3 can be
locked using four arbitrary capital letters. When the
SDD3 unit is locked, it is not possible to change
digital parameters. LEVEL meters and delay settings
are still visible.
Set the Lock password
To set the lock password enter the Lock menu,
select the Password position and select set at the
Lock function list, press ENTER. Set the requested
letter by rotating the encoder. To jump to the next
letter position press ENTER.
To exit renaming press FUNC/EXIT button. The
password must be set complete, with all 4 letters.
Password consists only of capital letters.
Lock now
When the password is set, the SDD3 can be locked
automatically using Autolock function, or manually
using Lock now function.
Autolock
Automatic lock function can be selected between
1min, 10mins, 1hour, or can be switched o. After
this time, when the SDD3 parameters are not being
changed, the SDD3 unit is automatically locked.
Unlock
When locked, the MENU is replaced with unlock
screen. To unlock, set the LOCK screen and set the
correct password letter by rotating the encoder. To
jump to the next letter position press ENTER.
When all 4 letters are entered correctly, the SDD3
will unlock.
Forgotten password
A forgotten password can be deleted by using the
RESET switch at the back of the SDD3. Pressing the
RESET button resets the SDD3 to factory default
setup and all previous memory settings will be
deleted back to factory default !
LEVEL
Lock now
Lock:
Password
A B C D
A B C D
DELAY
Autolock
MENU
Lock: Set password
( )yes
( )set
( )1 hour
LEVEL
Units mode
Subwoofer mode
DELAY
Memory
MENU
MENU screen - Lock
Lock
Display
Temperature
LEVEL
LOCKED
Enter password
DELAY LOCK
Unlock screen
SDD3 Setup

Display
The SDD3 is equipped with a high-contrast organic -
LED display.
Contrast
The contrast of the display can be set in the range
from 10% to 100% for comfortable use, depending
on ambient lighting.
Autodim
To ensure long life of the display, the display auto-
matically reduce s the contrast when the unit is not
currently used.
Temperature
The SDD3 calculates delay distances using the speed
of sound. Speed of sound varies with temperature.
The SDD3 allows the user to set the ambient tempe-
rature to calculate accurate delay settings.
Ambient
The ambient temperature can be set in the range
from -20°C to +40°C with 5°C steps. When the SDD3
units are set to imperial, the temperature
is displayed in °F.
When the SDD3 unit is switched to distance mode,
and the ambient temperature changed, you can
select the new temperature, the delay time is then
recalculated to keep the most consistent distance.
LEVEL
Units mode
Subwoofer mode
DELAY
Memory
MENU
MENU screen - Display
Page | 17
Lock
Display
Temperature
LEVEL
Contrast
Display:
Autodim
DELAY MENU
Display: Autodim
( )70%
( )1hour
LEVEL
Units mode
Subwoofer mode
DELAY
Memory
MENU
MENU screen - Temperature
Lock
Display
Temperature
LEVEL
Ambient
Temperature:
DELAY MENU
Temperature: Ambient
( )20°C
SDD3 Setup

Block diagram
Page | 18
PARALLEL OUT
A - DELAY OUT
INPUT
(full range)
PREAMPLIFIER DELAY (0 ÷ 393.216ms)
HIGH PASS
OUT LEVEL
HIGH PASS
(OFF ÷ 200Hz)
LEVEL/DELAY/MENU
0°
180°
ADC LEVEL
ADC LEVEL
OUTPUT
LEVEL
CH/SEL BYPASSENTER
+
-
LINE DRIVER PHASE BYPASS
LEVEL METERS
FN/EXIT
PHASE
CHANNELS
PARALLEL OUT
B - DELAY OUT
INPUT
(full range)
PREAMPLIFIER DELAY (0 ÷ 4393.216ms)
HIGH PASS
OUT LEVEL
HIGH PASS
(OFF ÷ 200Hz)
0°
180°
OUTPUT
LEVEL
LINE DRIVER PHASE BYPASS
PHASE
PARALLEL OUT
SUB1 - DELAY OUT
INPUT
(0 ÷ 120Hz)
PREAMPLIFIER SUB DELAY (0 ÷ 10ms)
OUT LEVEL
0°
180°
OUTPUT
LEVEL
LINE DRIVER PHASE BYPASS
PHASE
Channel A Channel B Sub Channel
SUB2 - DELAY OUT
OUT LEVEL
0°
180°
OUTPUT
LEVEL
LINE DRIVER PHASE BYPASS
PHASE
A B S1 S2
ADC LEVEL
ADC LEVEL

Dimensions
Page | 19
198 mm
482.6 mm
434 mm
44 mm

Page | 20
Input and output cables
XLR Plugs seen from solder side
SDD3 Male Plug
12
3
12
3
G
Female Plug
SDD3 Male Plug
12
3
TRS (Stereo) Jack
Jack output (balanced) - XLR input
Tip
Ring
Sleeve
- Pin 2 (Hot)
- Pin 3 (Cold)
- Pin 1 (Shield)
XLR output - XLR input
Pin 2
Pin 3
Pin 1
- Pin 2 (Hot)
- Pin 3 (Cold)
- Pin 1 (Shield)
XLR output - Jack input (balanced)
Pin 2
Pin 3
Pin 1
- Tip (Hot)
- Ring (Cold)
- Sleeve (Shield)
TRS (Stereo) Jack
12
3
SDD3 Female Plug
Jack output (unbalanced) - XLR input
Tip
Sleeve
Sleeve
- Pin 2 (Signal)
- Pin 3 (Shield)
- Pin 1 (Shield)
SDD3 Male Plug
12
3
(Mono) Jack
TRS (Stereo) Jack
12
3
SDD3 Female Plug
XLR output - Jack input (unbalanced)
Pin 2
Pin 3
Pin 1
- Tip (Signal)
- No Connection
- Sleeve (Shield)
SDD3 Input
SDD3 Output
Male Plug
12
3
12
3
SDD3 Female Plug
XLR output - XLR input
Pin 2
Pin 3
Pin 1
- Pin 2 (Hot)
- Pin 3 (Cold)
- Pin 1 (Shield)