MX34b LiveMix
ROLLS CORPORATION
SALT LAKE CITY, UTAH
09/08
b
HEADSET
MIC
1/8”
LiveMix
Two Channel Stereo
Microphone Mixer/
Headset Mixer
MADE IN USA
MX34b
www.rolls.com
QUICK START
OPERATION GUIDE
For warranty registration please visit the rolls web site at www.rolls.com.
INTRODUCTION
Thank you for purchasing the new MX34b LiveMix - two channel microphone mixer.
Although having many uses, this little mixer was originally designed with the video camera
operator in mind. It’s handy shoulder strap, easy-access microphone Level and Pan
controls, and smart Input/Output jack placement make the MX34b ideal for the live recording enthusiast. Two 9 volt alkaline batteries ensure adequate signal strength as well as
phantom power for your favorite condenser microphone.
Please review this manual carefully as it contains important information regarding the
proper use of this product.
INSPECTION
1. Unpack and Inspect the MX34b package
Your MX34b was carefully packed at the factory in a protective carton. Nonetheless, be
sure to examine the unit and the carton for any signs of damage that may have occurred
during shipping. If obvious physical damage is noticed, contact the carrier immediately to
make a damage claim. We suggest saving the shipping carton and packing materials for
safely transporting the unit in the future.
2. Please visit our website at www.rolls.com, click on the Register Your Warranty Here
text and follow the instructions to register your MX34b.
TABLE OF CONTENTS
INTRODUCTION 1
INSPECTION 1
TABLE OF CONTENTS 1
DESCRIPTION 2
Front Panel
Rear Panel
Battery Installation
Phantom Power
CONNECTION 3
A note on wiring a mono signal to the stereo AUX IN
OPERATION 4
SCHEMATIC 5
SPECIFICATIONS 6
WARRANTY BACK COVER
1
SPECIFICATIONS
Input Impedance: mic - 600 Ohms or greater XLR
aux - 47K stereo 3.5mm
Output Impedance: 50 Ohms
THD + Noise: .02%
S/N Ratio: 110 dB
Frequency Response: 20 Hz - 30 kHz (+0 / -1 dB)
Max Output Level: + 14 dB
Max Input Level: +20 dB
Max Gain: +70 dB
Batteries: 2 X 9V Alkaline
Current Draw: 30 mA
Phantom Power: +18 VDC
Input Connectors: 2 Female XLR, 1/8” (3.5mm)
DC Power Jack: (5.5 X 2.1 mm tip negative)
Output connectors: 3.5mm stereo main out
3.5mm Headphone
Size: 6.3”w x 3.7”d x 1.4” h
Weight: 1 lbs.
6
DESCRIPTION
FRONT PANEL
b
HEADSET
MIC
1/8”
MIC1 and MIC2
LEVEL: Adjusts the amount of signal of the indicated Microphone channel.
PAN: Adjusts the relative level of signal from the channel to the Right/Left Output.
pwr: When lit, indicates that the MX34b is on. A dim light indicates low battery
voltage.
HEADPHONE
LEVEL: Adjusts the amount of signal from the Headphone Output.
OUTPUT: 1/8” (3.5mm) jack containing the Headphone Output signal.
REAR PANEL
INPUTS: 1 - 2: XLR balanced inputs for connection to any standard dynamic or condenser
microphone. The input circuitry has a very wide input range and can accomodate almost
any (mic to line) level signal.
AUX IN: Tip-Ring-Sleeve stereo 1/8” (3.5mm) jack for connecting to another line-level
stereo signal source.
STEREO OUT: Tip-Ring-Sleeve stereo 1/8” (3.5mm) jack for connection to a camera or
other stereo input (Line-level only).
12 VDC jack: For connection to the Rolls PS27 12VDC power supply.
POWER: Button applies power to the MX34b.
BATTERY INSTALLATION: To replace the 9 V alkaline batteries, fi rst carefully press in and
up on the door to release the battery compartment. It then slides out and you can replace
the battery. Remember to replace both batteries at
the same time.
PHANTOM POWER: The Phantom Power jumpers are set to the off position from the factory. To
engage the phantom power, fi rst make sure the
MX34b is
powered off, use a pair of needle-nose
pliers or tweezers and carefully pull out the jumper
corresponding to the channel you wish to power.
Replace the jumper - connecting the two pins labeled
on.
SCHEMATIC
2
5
3 4
CONNECTION
Connect microphones to the MX34b via balanced XLR cables.
Stereo auxiliary sources such as the output from another mixer, AM/FM tuners,
CD Players, and MP3 players may be connected to the AUX IN via a stereo 1/8”
(3.5mm) Tip-Ring-Sleeve plug.
Connect the STEREO OUT to the Input of your recording device also using a
stereo 1/8” (3.5mm) Tip-Ring-Sleeve plug.
If you wish to use AC power for the MX34b, connect the Rolls PS27 12VDC
power supply.
OPERATION
Once your MX34b is properly connected, apply power by pressing in the POWER
button on the rear panel. The blue pwr LED on the front panel should light.
If you are using condenser type microphones, apply the phantom power by moving the jumper(s) to the proper setting (see page 2). Test the microphone levels
by speaking into the microphones at a normal operating volume, and adjust the
Mic Level controls until you achieve desired levels. Adjust each Pan control to
place the signal in the stereo fi eld.
Adjust the Headphone Level control for a comfortable listening volume.
For best results, we recommend recording a couple of test runs to ensure you
have proper levels set.
b
HEADSET
MIC
1/8”
When the signal becomes weak and distorted, and the pwr LED dims, the batteries will need replacing. See page 2; Battery Installation for details.
NOTE: ON CONNECTING A WIRELESS MIC TO THE AUX INPUT
DO NOT CONNECT A MONO PLUG TO
THE AUX IN OR STEREO OUTPUT. DOING SO WILL RESULT IN SIGNAL LOSS
OR DAMAGE TO THE MX34b.
If you need to connect a MONO signal (like
the output of a wireless microphone) to the
AUX IN of the MX34b, you will need to make or
purchase a MONO TO STEREO cable.Shown
here is a diagram of this cable’s wiring.
MONO PLUG
T
IP RING SLEEVE
STEREO PLUG
Tip and Ring are wired together,
then connected to the Tip of the
Mono Plug.
Connect STEREO headphones
or earphones to the 1/8” (3.5mm)
HEADPHONE OUTPUT located
on the MX34b front panel.
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