JK Audio RemoteMix 4 User manual

User Guide
RemoteMix 4
Portable Broadcast Mixer
JK Audio

2
Introduction
RemoteMix 4 is a four channel field mixer combined with a four
channel headphone amplifier. It includes a telephone line hybrid
and keypad, as well as a universal PBX handset interface and a
2.5 mm wireless phone interface. All this comes in a tough, port-
able unit that's smaller than a lunch box. These parts were de-
signed to work together and save setup time in the field. There is
no need to send an engineer with patch cables. All the pieces work
together in one reliable unit.
RemoteMix 4 also connects to any Bluetooth Wireless Technol-
ogy enabled device. This “hands free” mode offers a mono, tele-
phone-bandwidth connection. RemoteMix 4 will connect to any
Bluetooth enabled cell phone, or other device such as a notebook
or portable that allows a stereo wireless headset connection. This
stereo headset mode offers full audio bandwidth.
Radio - RemoteMix 4 was designed for sports remotes. You can
use it as a phone line hybrid, calling into your studio talk show hy-
brid. Or, use it as a front end mixer for your POTS, ISDN or IP co-
dec. You can also use it with your laptop codec.
TV - RemoteMix 4 gives you the ultimate phone connectivity with
four IFB feeds. You can send and receive interview audio, and pull
IFB out of any business phone system, or even from your cell
phone. This is more than a field mixer, this is a shoot saver.
Great Sound - A soft limiter prevents overdriving the phone line
interfaces, while the mixer XLR output is pre-limiter (full range).
Bass Boost adds some low end before sending the signal down the
phone line. The 3.5 mm send and receive jacks are convenient for
recording the show, or mixing in your MP3 player.
Power Smart Design - The phantom power generator only runs if
any of the rear panel 48 V switches are set to “ON” to avoid any
unnecessary drain on batteries. Low noise, low power ICs are used
throughout to preserve battery life. The low noise 100-240 VAC
desktop style power supply (included) overrides the battery power
only when the supply is actually providing power. If the power goes
out, the batteries automatically cut in.

3
1. Mic inputs 1 and 2 are balanced XLR jacks with low-noise am-
plifiers.
2. Mic inputs 3 and 4 are balanced XLR jacks with low-noise am-
plifiers. A mic/line selector switch adds a 40 dB pad for a line
level balanced input.
A switch on each of the 4 XLR mic inputs will provide 48 V
phantom power. If inputs 3 or 4 are set to Line input, the 48 V
will not be present at the XLR jack even if the switch is left on.
3. The stereo 3.5 mm line level input can be used instead of or in
addition to the channel 4 XLR input. You can connect either a
mono or stereo signal to this mini jack. If you use a stereo in-
put, both channels will immediately be summed together. Then
the audio from the mini jack and the XLR would be added to-
gether and treated as one mono signal on channel 4.
Connection
1235 4
4. The stereo 3.5 mm line level output can be connected to your
mini disk or other recording device. The Master Output will be
on the Left channel and the Receive mix from the phone line
and/or Cue input on the Right channel.
5. The Master Output is a balanced XLR jack that contains the
sum of all four input XLRs and the 3.5 mm input. This audio
signal has a full 20 Hz to 20 kHz bandwidth.
6. Each of the four mono headphone jacks can be set to hear ei-
ther a mix of local mic and line inputs or the return from the
phone line which will include a lesser amount of your local mix.
6

4
Operation
1. Connect your audio equipment, microphones, cue input, and
headphones to the input and output jacks on RemoteMix 4.
2. (a) Connect the jack marked "Phone Line" to any standard
analog telephone line, or
(b) Disconnect the handset on an existing telephone and plug
the coily cord from the phone into the Universal Handset
Interface jack on RemoteMix 4, or
(c) Connect the Wireless Phone Interface jack to the headset
jack on your cellular telephone using the supplied JK Audio
interface cable.
The 1/4” Wireless Interface jack also serves as a Cue Input
that feeds the headphones. Connect any line level output
here, such as the output from your personal audio player.
This signal does not reach the XLR output but will be pre-
sent on the right channel (return) of the stereo output.
3. Turn on the power switch, flip the "Phone Line" switch to "Dial/
Talk", flip the keypad switch to “On” (only if dialing with the Re-
moteMix 4 keypad) and dial your call. You are now ready to
broadcast or record a telephone interview.
2. (a) Standard
single analog
telephone line
2. (b) Handset jack
on PBX telephone.
Set A-B-C switch for
best audio.
OR OR
2. (c) Cell Phone
connection using
wireless phone
cable provided

5
Operation
Phone Line
The RemoteMix 4 has an RJ-11 jack that can be connected to any
standard, single line analog telephone line. This jack should not be
connected directly to digital PBX or ISDN phone systems.
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, 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
RemoteMix 4 Universal Handset Interface jack. Now select the
handset type on the 3 position switch.
Trial and error works faster than a chart of handset types, but this
basic description may help.
Switch Position Handset Microphone Type
A Electret
B Dynamic
C Carbon
Wireless / Cellular Telephones
RemoteMix 4 comes equipped with a cellular phone interface built
in to the 1/4” Cue Input. This 1/4” wireless interface accepts a spe-
cially designed 1/4” to 2.5 mm cable provided with the unit. This
interface works with any wireless phone that accepts standard
third party headsets and earpieces. Some wireless phones have
the standard 2.5 mm jack while others have proprietary jacks.
Adapters to convert the proprietary jack to a standard 3-conductor
2.5 mm jack are available for most wireless telephones through
their dealers, local electronic stores or many internet stores.
When using the wireless interface, it is important to keep your
wireless telephone 12” - 24” away from the RemoteMix 4 and any
microphone or headphone cables. This will help prevent unwanted
RF noise from entering the unit.
RemoteMix 4 may also be used with wireless analog (bag) tele-
phones in conjunction with their proprietary fax / modem adapters.
In this instance the fax / modem adapter should be connected to
the RJ-11 Phone Line jack.

6
Features
Headphone Controls
Each of the four headphone outputs has a separate level control so
each listener can adjust their audio level independently. The switch
beside each control knob will set whether that channel will hear just
a Mix of the mic and line inputs from the internal mixer or the Re-
turn audio from the phone line which will also contain some of the
mic mix but at a lesser level.
Cue Control
The Cue Input control adjusts the signal going to the headphones
from the 1/4” Cue Input. When using the 1/4” Cue Input Wireless
Interface, the Main Feed control adjusts the level of your own voice
in the headphones while the Cue Input control adjusts the level of
the person on the other side of the call in your headphones. You
should keep in mind that your wireless telephone also has level
control. If you are having level problems that cannot be corrected
with the controls on the RemoteMix 4, try adjusting the level on the
wireless telephone itself.
Bluetooth Wireless Technology
This switch activates the Bluetooth Wireless Technology. The blue
LED directly above this switch indicates when it is on. See page 9.
Mic Level Controls
Each of the four XLR inputs has a level control knob with a sepa-
rate red Clip LED to indicate clipping on each channel. If you see
more than an occasional flash of the Clip LED you should de-
crease the level for that channel.
Master Level Control
The Master control knob will set the overall level of the sum of all
the mic and line inputs. The LED meter for the master audio level
ranges from -30 dB to +3 dB.

7
Keypad
The telephone keypad provides DTMF tone dialing. You may use
the keypad at anytime during a call but keep in mind that both
transmit and receive audio are muted during a keypress.
Redial
Press this button to instantly redial the last telephone number that
was keyed in.
Power
This is the main power switch that turns the unit on. Whenever the
power is turned on, the red LED above this switch will be lit. The
green AC LED will be lit whenever a live AC power source is con-
nected, even if the main power switch is off.
Phone Line Switch
When using the RJ-11 analog phone jack, this switch acts as the
switch-hook for the telephone line. The Hang Up position is the
normal on-hook position when you are not using the line or you are
waiting for a call. When you want to place a call, or when a call
comes in, switch to the Dial / Talk position.
Ringer
RemoteMix 4 does not have an audible ringer but there is a visual
ring indicator that will flash for incoming calls. This red LED is lo-
cated directly below the keypad.
Keypad ON / OFF
This switch disables the DTMF keypad to prevent unwanted tones
from being transmitted down the phone line during a broadcast.
Bass Boost
With this switch turned on, the Master Output audio will be sent
through the Bass Boost before being routed to the telephone cir-
cuits.
Features

8
Features
IFB
If using the phone line or handset interface for an IFB feed, the
balanced male XLR output may be used to feed an IFB earpiece or
other device. If using the 1/4” cue input / wireless adapter jack for
the telephone connection, the IFB feed must be taken from one of
the 1/4” headphone jacks. This also applies if you are planning to
record both sides of the conversation while using the 1/4” wireless
adapter jack for the telephone connection.
Power
RemoteMix 4 is powered by two 9 volt alkaline batteries located
on the side of the unit. The red Power LED on the front of the unit
will extinguish when your battery power is weak enough to cause
distortion to your audio. Since these two batteries are in separate
drawers and wired in parallel, you can hot swap one battery at a
time so you never lose power.
It is important to replace both at the same time with identical
batteries. If two fresh batteries are not available, it is better to run
using only one good battery. Since the battery fixtures are wired in
parallel, it does not matter which one gets the single battery.
We also provide a high quality, regulated AC to DC adapter to
power RemoteMix 4 when AC power is available. Simply plug it
into the back of RemoteMix 4 and plug the transformer into a wall
outlet. This is a switching power supply so you can connect to a
110 or 220 VAC power source. When the power connector is
inserted into the jack, the batteries are bypassed. The AC adapter
does not charge the batteries. If you lose power during your broad-
cast, the RemoteMix 4 automatically reverts to battery power so
your broadcast will not be interrupted.
Make sure you use only the supplied AC power adapter with
the RemoteMix 4. Using any other adapter could damage the
unit.

9
Features—Bluetooth* Wireless Technology
Bluetooth* Wireless Technology
While the mono audio path is easy to follow on the block diagram,
the stereo audio path is slightly different. When in stereo mode, the
left and right audio paths from the Bluetooth device are mixed to-
gether before reaching the Receive bus. This is a full bandwidth
mono path, so you will hear the full audio signal, but it will be
mixed to mono. The transmit path is a bit more creative. The left
channel of the Bluetooth enabled stereo receive device will re-
ceive the mic mixer output. The right channel will receive the Cue
Input signal. Keep in mind that cell phones do not offer transmis-
sion of stereo audio signals. This stereo headset mode is typically
“listen only” from music player portables, and both directions from
portables that allow stereo recording.
To Connect:
Monitor the Bluetooth audio path on headphones in the "Return"
position. Pull up on the Bluetooth switch and hold for approxi-
mately 5 seconds. You will hear a beep in your headphones, fol-
lowed by a second beep or beeps. The blue LED will begin to flash
quickly as the RemoteMix 4 enters Pairing Mode. Now go to your
Bluetooth device and search for Bluetooth connections. The Re-
moteMix 4 uses an ID of "JKRM4xxx" where the “xxx” corresponds
to the last 3 digits of the unit’s serial number. The pin is "4xxx".
While all phones and portables are different, typically if you con-
nect in cell phone hands free mode, you will have a mono duplex
connection. If you connect to a music player, you will be in stereo
mode. Consult your cell phone or portable device for more details.
The Bluetooth interface will first attempt to connect in hands free
mode to a cell phone, allowing 3.4 kHz telecom bandwidth. If this
type of connection is not accepted, it will attempt to connect in
wireless headphone mode to any product that allows a Bluetooth
wireless audio connection. The wireless headphone mode offers
20 kHz audio bandwidth.
To disconnect from the Bluetooth device, simply pull up on the
Bluetooth switch and hold for 5 seconds. If left unused, the Re-
moteMix 4 will automatically disconnect Bluetooth in two minutes.
*The Bluetooth word mark and logos are owned by the Bluetooth SIG,
Inc. and any use of such marks by JK Audio, Inc. is under license. Other
trademarks and trade names are those of their respective owners.

10
FAQs
?Why doesn't my RemoteMix 4 ring when a call comes in?
!The audible ringer found on some of our other RemoteMix units was
replaced with a visual ring indicator on the RemoteMix 4. This red LED
flashes when a call comes in. The Ring indicator is located directly
below the keypad on the front of the unit.
?Will any cellular telephone work with RemoteMix 4?
!The wireless interface on the RemoteMix 4 works very well with most
cellular telephones. However, some wireless telephones generate ex-
cessive RF noise which can be can be heard as a “chattering” or
“motor boat” sound. The noise from these particular telephones will be
unacceptable for most broadcast applications. Also, some wireless
phones have the standard 2.5 mm headset jack while others have pro-
prietary jacks. Adapters to convert the proprietary jack to a standard 3-
conductor 2.5 mm jack are available for most wireless telephones
through their dealers, local electronic stores or many internet stores.
?What kind of device can I connect to the Cue Input?
!Setting the switch for the dual-purpose 1/4” input to “Cue Input” will
provide a standard line level input from another audio device, such as
a portable radio. The audio signal will be sent to any of the four head-
phone outputs if that headphone switch is set to “Return”. This way,
your announcers can listen for a cue from their radio station at the end
of a station break.
?What is the range of the Bluetooth transmitter/receiver?
!The RemoteMix 4 will transmit and receive audio signals up to 25 feet
from your Bluetooth device. Because transmitting signals over longer
distances will require more power, you should keep the RemoteMix 4
as close as possible to your Bluetooth device to conserve battery
power.
?The cellular interface cable was left behind at our last event. Can I
get a replacement at our local audio supply store?
!This is a custom made cable and is not wired the same as those that
may be available at your local electronics store. Please contact your
JK Audio dealer or our Customer Service department and ask for a
CN045 replacement cable.
?How can I tell how much battery life is remaining?
!The red “Power” LED functions as a battery life gauge that will gradu-
ally dim as the battery life runs down. This red LED will go completely
dark about a half hour before the unit shuts down. Keep in mind that
the VU meter, Bluetooth, and clipping LEDs will remain bright until the
unit stops functioning.