JK Audio Voice Path User manual

Voice Path
Telephone Handset Audio Tap
JK Audio
User Guide

2
Features
Input from PC
The cable marked input from PC accepts a line level
signal from your computer sound card to send down
the telephone line. This can be an audio CD playing in
your computer’s CD ROM drive, a conversation previ-
ously recorded from the VOICE PATH, or any other
audio on your computer that would normally play
through your computer speakers.
Output to PC
The cable marked output to PC sends a mic level sig-
nal to your computer sound card’s mic input. This sig-
nal will contain a mix of your voice (or other audio sent
down the phone line) and the audio from the other end
of the call. This mix ratio is not adjustable, it is a func-
tion of the telephone, not our product. As it turns out,
this is a suitable mix ratio for most applications.

3
Connection
Voice Path connects between the handset and the tele-
phone base of your telephone. Follow these simple
steps......
1. Unplug the modular handset cord from your tele-
phone base.
2. Using the black handset jumper cord that we have
provided, connect the telephone base jack of
VOICE PATH to the handset jack on the base of
your telephone.
3. Plug your handset cord, and handset (or headset)
into the handset jack on VOICE PATH.
4. Connect the From Phone cable to the mic input on
your computer.
5. Connect the To Phone cable to the line input on
your computer.

4
Connection (continued)
Handset Type Switch
The three position switch on the back of VOICE PATH
selects the type of microphone that is in the handset of
your telephone. When you push in the Playback button,
VOICE PATH replaces the handset microphone signal
with a circuit that must match the characteristics of the
handset microphone. The A B C selector switch covers
the main three microphone type.
Switch Position Handset Microphone Type
A Electret
B Dynamic
C Carbon
Note: Not all telephones are built alike so we cannot
guarantee VOICE PATH will work with any hand-
set design out there. We designed the interface
to work with most popular designs. If a conflict
arises it will typically be on the line input side. If
you attempt to send voice band signals down the
line input jack and the distant party complains that
the level is too loud or severely distorted
(clipping), try to lower the transmit signal on your
audio equipment. If this does not help, discon-
tinue use immediately.

5
Operation
The record/playback button selects which signal will be
sent down the phone line; the handset microphone, or
the input from PC cable.
Recording
After connecting the Voice Path as described on page 3,
recording a conversation is simple. Make certain the
Record / Playback button is in the “Out” position, then
start your recording from your software controls. The
level of the audio sent into your PC can be adjusted
from the back of the unit. Place a small screwdriver into
the hole marked “Volume to PC” and turn clockwise (to
raise level) or counter-clockwise (to lower level). This is
a passive unit so the signal can not be raised above mic
level (2800 ohms).
Playback
Make certain the Record / Playback button is in the “In”
position. Start the audio playing on your computer.
Select the appropriate position on the A-B-C selector
switch. The audio playing on your computer will be sent
down the telephone line to the other end of the call.
When the record / playback button is out, you can use
the handset to speak and listen as you normally would.
The sound that you hear on the handset is always avail-
able on the output to PC cable.

6
Operation (continued)
With the button in, the handset microphone is discon-
nected and the “Input from PC” cable is active to send
audio signals into the phone and down the line. You can
also use the Record / Playback button to turn off the
handset mic if you are listening to the “Output To PC”
signal over a loudspeaker. This will prevent feedback
between the handset microphone and loudspeaker. Or,
you can always listen over the handset receiver.
To continue using your computer speakers while Voice
Path is connected, use a “Y” adapter on your sound
card line output jack. Connect the Voice Path “To
Phone” cable to one jack on the adapter and your com-
puter speakers to the other. You should then follow
these steps to prevent your telephone conversations
from playing over your speakers:
1. Double click on the volume control (speaker) icon
near the clock on your Windows taskbar.
2. In the microphone section click the box labeled
“Mute”.
This will prevent audio entering the microphone input on
your soundcard from playing back over your computer
speakers. Everything else will function as normal.

7
FAQ’s
? The headset I am currently using goes through
an amplifier before it connects to my telephone.
Will the Voice Path work with this headset?
!If the amplifier was designed to connect to any tele-
phone's handset jack then yes. The Voice Path goes
between the amplifier and your telephone base.
Simply connect the Voice Path modular jack marked
"Phone base" to the handset jack of your telephone
base and the Voice Path modular jack marked
"Handset / headset" to the amplifier's modular jack
(that usually connects to the telephone handset
jack). Leave your headset connected to the amplifier
as usual and it should work fine.
?Can I still use my computer speakers when the
Voice Path is connected?
!Yes. You will need a "Y" adapter for your sound
card line output. This adapter should have 1 stereo
mini plug (male) that splits into 2 stereo mini jacks
(female). Plug the adapter into your sound card line
output, plug your computer speakers into one of the
adapter's mini jacks and the Voice Path "input from
PC" cable into the other.

8
FAQ’s
?I have a Voice Path connected between my tele-
phone and computer. I can record conversations
to my sound card but cannot send audio (from
the PC) down the phone line. What should I do?
!First make sure the Voice Path cable marked "Input
from PC" is connected to the line output or speaker
output of your sound card. This is usually where you
connect your PC speakers. Next, make sure your
computer volume (software) is at an acceptable
level.
Now follow these steps:
• Complete a call to a friend who can listen and evalu-
ate the signal. You will be able to hear their com-
ments during the call.
• Set the gray pushbutton on the Voice Path to the in
position. This disables the handset microphone and
enables the audio input.
• Play an audio file on your computer. It should be
long enough to complete this test (or select "loop
playback" from your software).
Next, switch between the 3 handset type positions on
the A-B-C selector switch on the back of the Voice Path.
Select the position with the best audio quality (best does
not necessarily mean loudest!). Then adjust the sound
card output level using your software.

9
Specifications
Input: Connector: 3.5 mm TRS cable
Input Impedance 10 k ohms
Level 250 mV RMS
Max input +12 dBM
Output: Connector: 3.5 mm TRS cable
Output Impedance 2800 ohms
Level 100 mV RMS
Max Output -16 dBm
Isolation from phone line 1500 Volts
Handset and Telephone connectors:
Modular 4pin/4wire handset jacks
Handset Compatibility:
Voice Path is designed to work with most
carbon, dynamic and electret handset mi-
crophone types.
Not for use with cellular telephones or telephones
that have a keypad in the handset.

10
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. The FCC requires us to provide the following
information:
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
FCC registered telephone.
This equipment may not be used with Party Line
Service or Coin Telephone Lines.
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.
3. Repair Instructions
If it is determined that your telephone equipment is
malfunctioning, the FCC requires that it not be used
FCC Registration

11
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 will notify you
before they interrupt service. If advanced notice is not
practical, you will be notified as soon as possible. You
will be given the opportunity to correct the problem,
and you will be informed of your right to file a complaint
with the FCC.
Your telephone company may make changes in its
facilities, equipment, operations or procedures that
could affect the proper functioning of your JK Audio
product. If such changes are planned, you will be
notified.
If this telephone equipment is to be used with a
telephone that is leased or owned by another party,
permission to connect this telephone equiment to their
telephone must first be obtained.
FCC Registration

The model Voice Path is covered by a 2 year warranty to
be free from defective workmanship and materials. In the
event that the Voice Path needs repair, you must call us
to get an authorization, and then carefully pack and ship it
to us. You will pay for shipping to us and we will pay for
return back to you, UPS ground. No free repairs will be
made if the defect was caused by misuse, weather
conditions, or other cause, except for defective
workmanship or materials. THERE ARE NO
EXPRESSED OR IMPLIED WARRANTIES WHICH
EXTEND BEYOND THE WARRANTY HERE MADE.
Warranty
06/06
JK Audio, Inc. 1311 E 6th Street, Sandwich, IL 60548 USA
Voice: [phone] Toll Free: 800-JK-Audio
Fax: [phone]
[email protected] www.jkaudio.com
Copyright ©2006 JK Audio, Inc. All Rights Reserved.