JK Audio ComPack User manual

JK Audio
ComPack™
Universal
Telephone Audio
Interface
User Guide

ii ComPack™ Universal Telephone Audio Interface
Thank You
Thank you for purchasing a JK Audio ComPack Universal Telephone Audio
Interface. Please read this guide for instructions on setting up and using your
new product.
Getting Assistance
If you have technical or application questions,
call us M-F: 8:30am-5:00pm (CT)
In the US & Canada (Toll-Free)
800-552-8346 All other countries: 815-786-2929
Email us at:
[email protected]
Or check out our FAQ section for answers to common questions.
Warnings & Safety Precautions
• Read and keep these instructions.
• Follow all instructions.
• Clean only with a soft dry cloth.
• Refer all servicing to qualied service personnel.
• Heed all warnings
Welcome
Caution: To prevent possible hearing damage,
avoid listening at high volume levels for long periods.
ComPack contains a headphone amplier that is more powerful than
the typical consumer product.
JK Audio products are designed for the broadcast industry. The
broadcast professional must be able to hear headphone signals
over the ambient noise level. From the cheering crowd at a football
game to trackside at a car race, the program material or cues must
be heard at high volumes without distortion.
Road Safety
Never use headphones while driving or cycling, etc. It can be
dangerous to turn up the volume even while walking. Doing so may
hinder your hearing and can be hazardous on the roadways or at
pedestrian crossings.
Handle with Care
While Compack was designed to be very rugged and durable,
it is not waterproof and care should be taken to keep the unit dry.

Contents
Overview 1
Getting to know your ComPack
2Front, Top, Bottom
3Left, Right 2
Getting Connected 6
Operation 6
Telecom / Intercom Link 7
FAQs 8
Technical Information 10
Contents iii
Contents
Limited Warranty
The ComPack is covered by a 2 year warranty to be free from defective
workmanship and materials. To obtain service, contact JKAudio by phone or
email for return authorization. Once authorized, you will carefully pack and ship
the faulty product and all accessories to us. You will pay for shipping to us and
we will pay for return back to you.
This warranty does not cover damages due to accident, weather, re, ood,
earthquake, misuse, unauthorized repairs or modications, or damages occurred
in shipping, only defective workmanship or materials.
There are no expressed or implied warranties which extend beyond the
warranty here made.

iv ComPack™ Universal Telephone Audio Interface
HD Voice Compatible (7 kHz Wide-
Band Speech)
Works withAnalog and Digital PBX or
VoIP Phones
4-conductor 3.5mm Headset Interface
Connects to Wireless Phones &
Notebooks
Headphone, Mic, and Line Input Level
Controls
XLR Mic Input (Mic/Line Switch)
XLR Line Output / Com Link
3.5mm Stereo Line Input
¼” Stereo Headphone Jack
Transmit Clip LED
Battery Test LED
DTMF Keypad and Lockout Switch
Handset Selector Switch
(Electret, Carbon, Dynamic)
>20 Hours on one 9V Alkaline Battery
Features
Features
Detachable North American
Power Cord
RJ11 Phone Cord
Wireless Phone
Interface Cable
What’s in the Box?

Overview 1
Remotely Anywhere.
Pick up this new handheld road tool to get audio in and out of analog phone
lines, PBX systems, even cell phones. Perfect for Remote Broadcasts, IFB feeds,
or interviews over any phone connection.
Wireless Phones and Notebooks.
Simply plug ComPack into the 3.5mm headset jack of your wireless phone or
notebook computer using the 1/4” TRS to 3.5mm TRRS interface cable. Your cell
phone will recognize ComPack as a headset which will disable the internal mic
and speaker.
ISDN, PBX, and VoIP Systems
Unplug the handset from any phone and plug the coily cord into ComPack. You
can now send and receive audio through the ISDN, PBX, or VoIP telephone set.
Analog Phones.
Plug ComPack into an RJ-11 jack, go o󰀨-hook and dial, or answer an
incoming call.
Add a Phone Line to the Party Line.
ComPack also functions as a simple telecom interface for your beltpack intercom
system. This no-frills feature allows you to connect the 3 pin male XLR to your
wet party line. This provides a full duplex, always-on connection to any telephone
network.
Ready to go?
The ComPack controls and connectors are clearly marked and ready for
operation. If this is your rst exposure to a hybrid, we suggest that you read the
entire manual to allow you to take advantage of all these features.
Any Questions?
Before you pick up the phone... Please thumb through the rest of this manual.
You might nd those deep technical questions are covered on later pages.
Overview

2ComPack™ Universal Telephone Audio Interface
Getting to Know Your ComPack
1
4
2
5
3
6
7
89 10
1. Mic Input Level
Adjusts the signal level that you are sending down the telephone line,
through the female XLR input. The <Clip> LED indicates clipping on the
input channel if the level is set too high. If you see this red LED ashing,
you should decrease the <Mic Input>.
2. Line Input Level
Adjusts the signal level that you are sending down the telephone line,
through the 3.5mm mini jack input.
3. Headphone Level
Adjusts the signal level coming from the ¼” headphone jack.
Controls & Indicators

Controls & Indicators 3
Getting to Know Your ComPack
4. Power Switch
The power switch should be left in the <O󰀨> position any time the unit is
not being used or battery drain will occur. The unit will retain a phone line
connection if the power switch is turned o󰀨 during a call.
5. Phone Line Switch
When using the analog <Phone Line> jack, this switch acts as the
switchhook for the telephone line.
When you want to place or answer a call, switch to the <Dial/Talk> position.
The <On Hook> position is when you are not using the line or you are
waiting for a call.
When using the Universal PBX Handset or Wireless Phone Headset
Interface, the switch should remain in the <On Hook> position at all
times.
6. Keypad Switch
This switch disables the DTMF keypad to prevent tones from being blasted
down the phone line during a broadcast. You should leave this switch in the
<O󰀨> position when using the Wireless Phone Headset or Universal PBX
Handset Interface.
7. DTMF Keypad
Dial a number when connected to an analog telephone line. The transmit
audio is muted during a keypress.
Inputs & Outputs
8. Mic In
The female XLR input can be used for either the connection of a dynamic
microphone or a line level audio signal such as from an audio mixer. This
input can be used at the same time as the 3.5mm line input.
9. Mix Out / Com Link
The Male XLR output can be used in two ways: as a balanced, xed level
mixed mono output or as a bi-directional telecom link for your beltpack
intercom system.
10. Headphones
The headphone output is a 1/4” 3-conductor jack. Both the tip and ring of
this jack contain the same audio signal. Either mono or stereo headphones
may be used.
Controls & Indicators

4ComPack™ Universal Telephone Audio Interface
Getting to Know Your ComPack
3 4 5 6 7 81
9 10
2
Left Side
Right Side
1. Battery Test
Press this button to test the battery, the LED indicates if it has a charge. The
unit may still function if the LED does not light, but there may be signicant
audio distortion and a loss of level as the battery continues to discharge.
Under normal use you should get at least 20 hours of continuous use from
one 9 volt alkaline battery.
2. Visual Ring Indicator
The Ring LED will ash when there is an incoming call from the phone line.
This feature is disabled when ComPack is being used with the handset
interface or the wireless phone interface.
3. Phone Line
Use this jack to connect to standard analog telephone lines. This jack
should not be connected directly to digital PBX or ISDN phone systems.
Controls, Indicators & I/O

55
Getting to Know Your ComPack
4. Wireless Phone Headset Interface
This interface works with any wireless phone or notebook that accepts
standard third party headsets and earpieces. Your product has been
supplied with a 1/4” TRS to 3.5mm TRRS interface cable. While the majority
of current wireless phones use a 4-conductor, 3.5mm TRRS headset jack,
some older phones use a 2.5mm TRS headset jack. If your phone uses this
smaller 2.5mm headset jack, you may contact our support department to
request a compatible interface cable.
When using the wireless interface, it is important to keep your wireless
telephone 12” - 24” away from the ComPack and any microphone or
headphone cables. This will help prevent unwanted RF noise from entering
the unit.
5. Universal PBX Handset Interface
If you do not have access to an analog phone line or if the phone system is
a digital or analog PBX, ISDN, VOIP or a key telephone system, you can use
the built-in handset interface. Disconnect the telephone handset from the
coily cord and plug the cord into the ComPack <Universal PBX Handset
Interface> jack. Dialing must be done with the existing telephone. Make sure
to leave the telephone handset o󰀨 hook or your call will be disconnected. Do
not connect a handset to the ComPack; you must talk through your mic.
6. Handset Type Selector Switch
Select the best handset type.Trial and error works faster than a chart of
handset types, but this basic description may help.
A=Electret, B=Carbon, C=Dynamic
7. Line Input
The 3.5mm input is a mono, line level input. This input can be used at the
same time as the XLR input.
8. XLR Input Mic/Line Selector
Selects whether the female XLR is to be used as a mic level or
line level input.
9. Male XLR Function Selector
Selects how the male XLR jack will be used.
Set to <Phone Mix Output> for a mix of the telephone caller and the
microphone or line input from the female XLR jack.
Set to <Intercom Link> to provide bidirectional audio for use with your
intercom beltpack system.
10. 9 VDC Power Jack
ComPack is powered by one 9V battery or the included AC adapter. TheAC
adapter is for powering the unit only, it does NOT charge the battery. The
battery is bypassed when power is supplied by the AC adapter. The battery
should be removed if it is not going to be used for extended periods of time.
Controls & Indicators

6ComPack™ Universal Telephone Audio Interface
Setting Up
1. Connect your microphone (and/or line input) and headphones to the input
and output jacks on ComPack.
2. There are 3 ways to connect the ComPack to the phone line:
A. For Analog Phones: Connect the jack marked <Phone Line> to any
standard analog telephone line.
B. If there is no access to an Analog Phone Line: Disconnect the
handset on an existing telephone and plug the coily cord from the
phone into the <Universal Handset Interface> jack on ComPack.
C. If there is no Land Line: Connect the <Wireless Phone Interface>
jack to the headset jack on your cellular telephone using the supplied
JK Audio interface cable.
3. Connect the supplied AC power cord to the ComPack and then to an AC
power outlet if an outlet is available.
This device should be connected to an adequate surge protective
device at all times both for the power connector and for the
telephone line to avoid damage from lightning or electrical surges.
Operation
A. For Analog Phones:
1. Flip the Power Switch to <On>
2. Flip the Phone Line Switch to <Dial/Talk>.
3. Flip the Keypad Switch to <On>.
4. Dial Your Call using the keypad on the ComPack.
5. To hang up, ip the Phone Line Switch to <On Hook>.
B. For PBX, VoIP, or ISDN phones:
1. Disconnect the telephone handset from the coily cord and plug the cord
into the ComPack <Universal PBX Handset Interface> jack. ComPack
should be plugged into the telephone base, not the wall jack.
2. The Phone Line Switch should be left in the <On Hook> position.
3. The Keypad Switch should be left in the <O󰀨> position.
4. To place or answer a call, take the handset o󰀨 hook. Dialing must be
done from the telephone itself.
5. To hang up, place the handset back on hook.
C. For Wireless phones:
1. Connect the <Wireless Phone Headset Jack> to the 3.5mm headset
jack on your wireless phone using the supplied TRRS interface cable.
2. The Phone Line Switch should be left in the <On Hook> position.
3. The Keypad Switch should be left in the <O󰀨> position.
4. Dialing and answering of calls must be done from the telephone itself.
Getting Connected

7
Telecom / Intercom Link
ComPack also functions as a simple “no-frills” telecom link for your beltpack
intercom system. ComPack will provide bi-directional audio on pin 3 of the male
XLR jack to any industry standard intercom beltpack system. ComPack does not
provide power over this XLR jack nor does it require power from the loop.
Note: ComPack will not recognize a call signal generated by your intercom
system and it will not provide one.
1. Slide the Male XLR selector switch to the <Intercom Link> position. This
recessed switch is located near the power jack. Accessing the switch can be
done using a small blade screwdriver, or other such object, inserted into the
opening. The left position (towards the XLR jacks) designates Line Output.
The right position (towards the volume controls) designates Com Link. The
factory default position of this switch is Line Output.
2. Connect your beltpack intercom XLR cable to the ComPack
<Mix Out / Com Link> jack. The XLR jack is wired as:
Pin 1: Ground
Pin 2: Open
Pin 3: Two-Way Audio
3. Your intercom headset should remain plugged in to your beltpack system,
not directly into ComPack.
Getting Connected

8ComPack™ Universal Telephone Audio Interface
FAQs
1. How do I select which telephone interface to use (analog
phone line, PBX, or wireless)?
Actually, all three connections are live all the time. Technically, you could
connect to all three at once, but since there is no way to equalize levels, this
“conference call” might not be the best quality connection.
2. Will ComPack work with any cell phone?
ComPack has been tested with many popular brands and model phones
that use the 3.5mm 4-conductor TRRS style headset. However, there are
no industry standards, so we cannot promise compatibility with any brand or
model phone.
3. Can I talk on my cell phone while I record the call?
No, most phones detect the presence of anything plugged into the headset
jack and immediately disable the phone’s microphone and speaker.
4. Can I send and receive audio at the same time?
Yes, but whatever audio you send into the ComPack will come back mixed
with the caller audio.
5. Will ComPack provide phantom power for my mic?
No, ComPack will not provide phantom power. If you are connecting your
microphone directly to a ComPack, you should use a dynamic mic.
6. The output from my Mic is low.
Check the position of the <Mic/Line> switch on the side near the Mic jack.
This input can be switched to accept a line level signal from a mixer or other
equipment.
7. How can I record my conversation?
Slide the Male XLR function switch to <Phone Mix Output> and you can
connect the ComPack Male XLR to your mixer or recording device for a nice
mix of both sides of the conversation.

8. Can I connect ComPack to a powered beltpack line?
Yes, the ComPack has a DC blocking cap so it will not be damaged if
connected to a powered line, although DC power is not necessary for
operation. You must switch the Male XLR Function switch to <Com Link> for
proper operation.
9. I’ve lost the power supply for my ComPack. I have another
power supply that ts from a di󰀨erent product. Can I use
this instead?
No! Never use a power supply other than the one that was supplied by your
manufacturer. Power supplies are available in either AC or DC output with
many combinations of voltage and available current. Most consumer power
supplies are not regulated. This could invariably damage your equipment, and
also create a great deal of noise. Our products are designed for and tested
with their respective power supplies for optimum operation. If you have lost
your power supply, please contact your JK Audio dealer or our Customer
Service department and ask for a power supply for your ComPack.
FAQs 9
FAQs

10 ComPack™ Universal Telephone Audio Interface
Technical Information
Hybrid
Transformer
Isolation
Transformer
1/4"
Headphone
Jack
Intercom
Link
Line
Output
Switch Selects
XLR Function
1/4" TRS
Cellular
Interface
RJ-22
Handset
Jack
RJ-11
Phone Line
Jack
Ring LED
Headset
Emulator
Circuit
Universal PBX
Interface
ABC Switch
Hybrid
Transformer
DTMF
Keypad
Clip
LED
mic / line
switch
XLR
Input
3.5mm
Line
Input
Signal
Limiter
Block Diagram

Input Impedance / Level
Female XLR: 1k ohms / 15 mV RMS; -34 dBu nom.;
Mic/Line Pad Switch = +6 dBu max
1/8” (3.5mm) Stereo: 20 k ohms / 250 mV RMS; -10 dBu nom.
Output
Male XLR: Phone Mix Mode: 600 ohms / 45 mV RMS; -25 dBu nom.
Intercom Link Mode: Bi-Directional Unbalanced
1/4” Stereo Headphone: 8 ohms, ½ watt
Misc
Phone Line: RJ11C
Ringer: 0.9B REN
Isolation: 1500 VAC
Keypad: DTMF
Power: One 9 volt battery or AC power supply (included)
Size: 8” x 3” x 2.2” (20.3 x 7.6 x 5.6cm)
Weight: 1.5 lbs (680 g)
Specications
Technical Information 11
Technical Information

12 ComPack™ Universal Telephone Audio Interface
Manufacturer’s Name:
Manufacturer’s
Address:
JK Audio, Inc.
1311 E 6th Street
Sandwich, Illinois 60548 USA
Declares that the product:
Product Name:
Model Numbers: ComPack Universal Telephone Audio Interface ComPack
Conforms to the following Product Specications:
Safety:
ESD:
Emissions:
Telecom:
AS/NZS 60950.1:2003
CAN/CSA-C22.2 No. 60950-00 3rd edition
UL Standard 60950 3rd edition
EN 55024:1998
EN 61000-3-2
EN 61000-3-3
EN 55022:1998
AS/NZS 3548 (1995)
FCC Part 15, Subpart B
ICES-003
AS/ACIF S002:200
FCC CFR 47, Part 68
Declaration of Conformity
Declaration of Conformity

13
The product herewith complies with the requirements of the following Directives and
carries the CE marking accordingly:
LVD 2006/95/EC (Safety)
R&TTE 1999/5/EC (Telecom)
EMC 89/336/EEC (ESD immunity)
RoHS Directive 2015/863
The Technical File containing supporting documentation is maintained at:
JK Audio, Inc (Corporate Headquarters)
Compliance Manager
1311 E 6th Street
Sandwich, Illinois 60548 USA
815-786-2929 phone
815-786-8502 fax
Declaration of Conformity
Declaration of Conformity

14 ComPack™ Universal Telephone Audio Interface
FCC Registration
Your new JK Audio product has been registered with the Federal Communications
Commission (FCC). This product complies with the standards in Part 68 of the
FCC rules.
1. Connection and use with the nationwide telephone network
The FCC requires that you connect this telephone equipment to the national telephone
network through a USOC RJ-11C modular telephone jack. This equipment may not be
used with Party Line Service or Coin Telephone Lines. This equipment is hearing aid
compatible.
2. Information for the telephone company
Upon request from your local telephone company, you are required to provide the
following information:
A. The “line” to which you will connect the telephone equipment (that is, your
telephone number), and
B. The telephone equipment’s FCC registration number.This can be found on the
bottom of your telephone equipment, and,
C. The ringer equivalence number (REN) for this equipment. The REN is used
to determine the quantity of devices which will be connected to the telephone
line. Excessive RENs on the telephone line may result in the devices not
ringing in response to an incoming call. In most, but not all areas, the sum of
the RENs should not exceed 5.0. To be certain of the number of devices that
may beconnected to the line, as determined by the total RENs, contact the
local telephone company.
3. Repair Instructions
If it is determined that your telephone equipment is malfunctioning, the FCC requires
that it not be used and that it be unplugged from the modular outlet until the problem
has been corrected. Repairs to this telephone equipment can only be made by the
manufacturer or its authorized agents or by others who may be authorized by the
FCC. For repair procedures, follow the instructions outlined under the warranty section
of the manual.
4. Rights of the telephone company
If telephone equipment is causing harm to the network, the telephone company may
temporarily discontinue your telephone service. If possible, they’ll notify you before
they interrupt service. If advanced notice isn’t practical, you’ll be notied as soon as
possible. You’ll be given the opportunity to correct the problem, and you’ll be informed
of your right to le a complaint with the FCC. Your telephone company may make
changes in its facilities, equipment, operations or procedures that could a󰀨ect the
proper functioning of your JK Audio product. If such changes are planned, you’ll be
notied by your telephone company.
FCC Registration

FCC Compliance Notice 15
FCC Part 15 Subpart A Compliance
This equipment has been tested and found to comply with the limits for a Class A
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and used in accordance with
the instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference
in which case the user will be required to correct the interference at his/her own
expense.
Changes or modications not expressly approved by JK Audio can void the user’s
authority to operate the equipment.
FCC Compliance Notice

JK Audio, Inc.
1311 E 6th St.
Sandwich, IL 60548
United States
Telephone: [phone]
Toll Free: 1.800.jkaudio
Fax: [phone]
www.jkaudio.com
© 2019 JK Audio, Inc.All rights reserved.
ComPack™
Universal Telephone Audio Interface
User Guide Version 7/3/19
JK Audio