Fender LTB Portable Sound System User Manual

PORTABLE

SOUND SYSTEMS

From Fender Pro Audio

Owner's Manual for
LTB Portable Sound System

P/N 051923

REV B

Fender Musical Instruments
7975 North Hayden Road, Scottsdale, Arizona 85258 U.S.A.

Fender knows the importance of sound reinforcement. From the simple box-top mixer
to today's professional touring concert systems, the need to communicate, to make the
connection between the performer and the audience is foremost in Fender's mind.

Perhaps no other single piece of gear can make or break your band's sound. You see,
your sound system is more than just a combination of dials, wires and speakers. It is
an integral part of the audio chain and should be treated with special care and attention
to detail.

At Fender, we know what building quality musical instruments and sound reinforcement
equipment is all about. In fact, many of the world's best sounding electric musical
instruments and sound reinforcement equipment proudly wear the Fender name.

Whether you need a simple box top powered mixer for your Saturday afternoon jam, or
a professional full-size concert system, Fender has the sound reinforcement equipment
to meet your needs. Likewise, your decision to purchase Fender pro audio gear is one
you will appreciate with each performance for years to come.

Wishing you years of enjoyment and a heartfelt thank you,

Bill Schultz

Bill Schultz
Chairman
Fender Musical Instruments Corporation

INTRODUCTION

THE FENDER L

THE FENDER L

PORTT

POR

ABLE POWERED

ABLE POWERED

MIXER

MIXER

TB

TB

80 Watts into 4Ω

3-Band Equalizer

+15V DC Phantom Power

Individual Channel Effects Level Control

Both 1/4 inch Phone TS and 3-Pin XLR
Female Input Connectors

Patch Points for Line Level Outboard Gear

Full-bodied Spring Reverb

Everything You Need to Get Started:

LTB Mixer / Amplifier
One Dynamic Cardiod Microphone
One Microphone Cable
Two Speaker Cables
Two Full-Range Speaker Enclosures

The LTB: an 80 watt professional powered mixer
from your friends at Fender®Pro Audio. We are sure
you will find your new LTB sound system to be both
a unique and effective sound reinforcement product,
providing years of trouble-free service. With ease of
setup in mind, the integrated mixer/amplifier design
combined with the full-range LTB-10 speaker
enclosures makes your LTB a versatile, yet simple to
operate sound system. Included in your LTB
package is one dynamic cardiod microphone, one
microphone cable and two speaker cables;
everything you need to get started.

Enclosed in a boxtop style cabinet, your LTB
mixer/amplifier features individual channel preamps,
+15V DC phantom power, line and mic level channel
inputs, a patch bay and much, much more. With
1/4 inch TS phone jacks and 3-Pin XLR female
input jacks, your LTB sound system can
accommodate a wide variety of input connections
and signal levels.

Ideal for live music, churches, auditoriums, hotel
conference or meeting rooms, your LTB sound
system is suitable for a variety of sound
reinforcement applications. The LTB mixer /
amplifier‘s front panel patch bay makes using
outboard effects gear and signal processing
equipment a snap. Moreover, the patch bay
provides easy access for adding or rerouting power
amplifiers. Still, the LTB-10 speaker enclosures
deliver a powerful, full-range sound ideal for music,
vocals or whatever your sound needs require.

Designed for the both novice, as well as the
seasoned audio professional, your LTB sound
system will provide years of reliable, trouble-free
service, day in and day out. Please read through
this owner’s manual in order to more thoroughly
understand the operation of your LTB portable
sound system.

WARNING:

- TO REDUCE THE RISK OF FIRE OR SHOCK
HAZARD, DO NOT EXPOSE THIS UNIT TO RAIN OR
MOISTURE.

- NO USER SERVICEABLE PARTS INSIDE, REFER

SERVICING TO QUALIFIED PERSONNEL ONLY.

- THIS UNIT MUST BE EARTH GROUNDED.

3

INPUT CHANNEL CONTROL FUNCTIONS

AB

C

DE

A. EQ - Adjusts the tone / frequency boost or cut of

its respective channel. When the tone control is set
at the 12 o’clock (notched) position, the channel is
“flat” with no frequencies cut or boosted. As the dial
is rotated clockwise, the treble response increases.
Likewise, as the dial is rotated counterclockwise the
treble response decreases.

B. EFX - This knob controls the amount of signal its
respective channel sends to the EFX output jack for
external signal processing devices and to the internal
reverb pan. When the knob is set at 0, no signal is
sent to the EFX output jack for external signal
processing or to the internal reverb pan.

C. LEVEL - Adjusts the volume of the individual
channel. Rotating the knob clockwise increases the
respective channel’s contribution to the “Main Out”
mix. After slowly raising the MAIN volume control,
slowly bring up this input level control listening for
the onset of feedback or howling or until the desired
level is reached. The LTB’s overall volume can be
increased by rotating the MAIN control clockwise.

D. HIGH Z - Plug your high impedance
microphones, keyboards, drum machines, outboard
effects, etc. in here. This 1/4 inch, TS unbalanced
input jack is suited for use with items having line
level outputs.

E. LOW Z - Plug your microphone in here. This
three pin XLR balanced female input connector is
intended for input signals from low impedance
microphones. Pins 2 and 3 automatically provide
Phantom Power (+15V DC) for some condenser
style microphones.

4

MASTER CONTROL PANEL FUNCTIONS

A

BC

ED

KJIH

A. LOW - Adjusts the amount of low frequency

boost or cut in the LTB. When all the tone controls
are set at their 12 o’clock (notched) position, the
LTB is “flat” with no frequencies cut or boosted.

B. MID - Adjusts the amount of middle frequency
boost or cut in the overall mix.

C. HIGH - Adjusts the amount of high frequency
boost or cut in the overall mix.

F

G

I. EFX - This 1/4 inch, TS, unbalanced, line level

output jack is designed to feed the LTB’s effects bus
signal to an external signal processing device, such
as a digital delay or a chorus unit.

J. AUX IN - This 1/4 inch, unbalanced, TS, line level
input jack is designed to accept signal from an
external processing device, such as a digital delay or
a chorus unit. Any signal entering this jack is mixed
into the Main bus signal.

F. POWER LED - This LED
illuminates when the LTB is on.

G. POWER SWITCH - Turns
the AC power ON and OFF.

H. MAIN - This 1/4 inch, TS,
unbalanced, line level output is
designed to feed the LTB’s main
bus signal to an external power
amplifier or main house mixer.

D. MAIN - The main volume control of the LTB.
Rotating the knob clockwise increases the LTB’s
overall volume level.

E. REV - Adjusts the reverb signal level sent to the
main mix. Rotating the knob clockwise increases
the amount of reverb signal.

REAR PANEL FUNCTIONS

L

L. POWER SUPPLY CORD

- This is a grounding type

supply cord to reduce the
possibility of shock hazard.
Completely unwind the cord
from its cord wrap to prevent
blocking air flow. Be sure to
connect the cord to a
grounded receptacle. DO

NOT ALTER THE AC PLUG.

K. FTSW - This 1/4 inch, TS, unbalanced, output

jack is designed for use with an optional footswitch
(P/N 048458). When a footswitch is inserted into
this jack, the LTB’s internal reverb can be turned on
or off remotely.

M. PARALLEL SPKR
JACKS - These

speaker level output
jacks feed your main
speaker enclosures.
Remember, the total

minimum impedance
load is 4 ohms. Connecting a load of less than 4

ohms may result in unsatisfactory performance such
as overheating to the point of thermal shutdown.

M

4Ω MIN. LOAD TOTAL

80W

5

BASIC SETUP OF YOUR LTB

Before using the LTB, please read and
follow the steps listed below:

1. IMPORTANT Heed all safety warnings when
operating the LTB.

2. Please be sure to check for these items. The
LTB sound system comes complete with 2 LTB-10

Speaker cabinets, 2 speaker cables, 1 microphone
cable and 1 dynamic cardioid microphone.

3. Make sure the power switch is in the OFF
position, the EQ, LOW, MID and HIGH tone controls
are in their 12 o’clock notched positions and all
channel LEVELS, the MAIN and the REV are in their
MIN positions.

POWERPOWER

Stereo CassetteStereo Cassette

R

L
RECORD LEVEL

RECORD LEVEL L R

LEFT

LEFT

2

2

0

0

9

9

3

3

1

1

O

O

RIGHT

RIGHT

4

4

2

2

1

1

APE SELECT
T

TAPE SELECT

0

0

RECORD

RECORD

1

1

Y

1

1

0

0

PLA

PLAY

1

1
1

1

NORMAL

NORMAL

2

2

2

2
2

2

2

2

3

3

C O

C O

r 2

r 2

FF

FF

3

3

REW

REW
OP

STOP

ST

AUSE
P

PAUSE

4

4

AL

4

4

MET

METAL

-5

-5

-5

-5

4. Next, plug the supply cord into a power source
with the correct voltage.

5. Connect the speaker cables
from the LTB’s SPEAKER
OUTPUT jacks located on the rear
of the LTB mixer to the input jacks
on the speaker cabinets.

80W

4Ω MIN. LOAD TOTAL

6. Connect the cord(s) from any microphones,
instruments, outboard gear or other signal source(s)
to the appropriate input jack(s) on your LTB.

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5

3

4

2

6

8

7

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January 27, 1997

No

This full page illustration can be found on page 8.

7. Turn all instruments, outboard gear and other
equipment ON before powering up the LTB.

8. Slowly raise the MAIN volume control to its 12
o’clock position. Next, slowly bring up the
appropriate channel input level control (ie: if the

microphone is plugged into the channel 1 inputs, the
appropriate channel control is labeled 1), listening for

the onset of feedback or howling or until the desired
level is reached. The LTB’s overall volume can be
increased by rotating the MAIN
control clockwise.

9. If using external signal processing
devices, slowly raise the appropriate channel EFX
control until the desired level is reached (ie: if the

microphone is plugged into the channel 1 inputs, the
appropriate channel control is labeled 1).

10. When shutting down the LTB, turn OFF the LTB
FIRST then any additional outboard gear,
instruments or other equipment.

For more detail on setting up your LTB, please refer
to the diagrams on pages 9 and 10.

6

TROUBLESHOOTINGGROUNDING AND HUMS

Ground loops are one of the most
common causes of hum and buzz in
sound reinforcement systems and other
audio products. A ground loop usually
occurs if the separate pieces of

equipment are plugged into different AC
circuits. Also, if the audio wiring is placed too close
to the power cords, hums or buzzes can bleed into
the system. Still, improperly maintained power and
audio cables are yet another cause of bothersome
noise. In order to help minimize stray hums and
buzzes, here are some helpful hints.

1. Keep all electronics connected to the sound

system on the same electrical circuit.

2. Keep audio signal cables away from the AC

power cords.

3. Use balanced cables when applicable.

4. Always plug the LTB into a grounded AC electrical

outlet.

5. Be sure to use properly maintained cords and

cables with the LTB.

VINYL COVERING CARE

The LTB mixer and speaker cabinets

are covered in vinyl for long life and

lasting good looks. To clean the

cabinets, use a sponge dampened with

a light soapy solution. Avoid spilling any
liquids on the operating surface, grilles, volume and
tone controls, switches and line cord inputs.
ALWAYS unplug the LTB before cleaning it or
approaching it with fluids. Before plugging in the
LTB wait until the unit has completely dried.

If the LTB is set up but does not
function, please check the following
items:

• Is the LTB 's power cord properly plugged into an
electrical outlet?

• Is there power at the outlet?

• Are the volume control knobs on the LTB turned
above the MIN position?

• Are the volume control knobs on your instruments
turned above their minimum position?

• Is the mic/instrument properly plugged into the
LTB ?

• Is the mic/instrument turned on?

• Are your audio cables frayed, cut or damaged?

• If using an outboard gear, are the cords
properly connected?

• Are the speaker cables properly connected?

• Is there power to the outboard gear?

• Are the levels on your outboard gear above their
minimum positions?

• (If applicable) does your instrument have power?

If after checking all of the above the LTB is still not
performing correctly, consult your nearest authorized
Fender Service Center.

7

SIMPLE LTB SETUP

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3

5

4

2

1

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January 27, 1997

No

1. Connect the speaker cords from the PARALLEL
SPKR JACKS to the LTB-10 speakers.

2. Connect a microphone to a LOW Z input jack and
any keyboard or other instrument to a HIGH Z input
jack.

POWERPOWER

Stereo CassetteStereo Cassette

2

2

0

0

9

9

3

3

1

1

O

O

4

4

2

2

1

1

RECORD

RECORD

Y

0

0

PLA

PLAY

1

1

2

2

FF

FF

3

3

REW

REW

OP
ST

STOP

AUSE
P

PAUSE

4

4

-5

-5

R

L

RECORD LEVEL

RECORD LEVEL L R

LEFT

LEFT

RIGHT

RIGHT

APE SELECT

T

TAPE SELECT

0

0

1

1

1

1

1

1

NORMAL

NORMAL

2

2

2

2

2

2

3

3

C O

C O

r 2

r 2

4

4

AL
MET

METAL

-5

-5

3. The LEVEL control in each channel strip adjusts
the amount of signal sent to the main bus where all
channel signals are summed. The MAIN knob in
the master section adjusts the volume level to the
main speakers.

4. Be sure to turn the tape deck, keyboard or other
instruments and gear on before powering up the LTB.

8

RUNNING AN EFFECTS PROCESSOR THRU YOUR LTB

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4

2

1

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January 27, 1997

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1. Connect speakers, microphones and other
equipment to the LTB as before.

2. Next, connect a cord from the EFX jack to the input
on the effects processing unit. Return the signal to
the LTB by connecting a cord from the output of the
effects unit to the AUX IN jack on the LTB.

3. The EFX knob on each channel adjusts the
amount of signal sent to the EFX jack where the
signal is then sent to the processor.

4. Be sure to turn on the tape deck, keyboard or
other instruments and outboard gear before
powering up the LTB.

9

SPECIFICATIONS FOR THE LTB POWERED MIXER

DESIGNATION TYPE PR 345
PART NUMBER 071-1700-000 (120 V)

071-1730-000 (240 V) Aust
071-1740-000 (230 V) UK
071-1760-000 (230 V) Euro

POWER SPECIFICATIONS 120V version: 120V AC, 60 Hz, 270W

230V version: 230V AC, 50 Hz, 270W
240V version: 240V AC, 50 Hz, 270W

PRE-AMPLIFIER SECTION

MIC INPUT IMPEDANCE 2.7 kΩ
LINE INPUT IMPEDANCE 100 kΩ
MIC INPUT SENSITIVITY 2 mV
LINE INPUT SENSITIVITY 6 mV
CHANNEL TONE CONTROLS Low +/- 15 dB @ 30 Hz

Mid +/- 15 dB @ 1 kHz
High +/- 15 dB @ 15 kHz

OVERALL AMPLIFIER -3 dB @ 10 Hz to -3 dB @ 50 kHz
FREQUENCY RESPONSE (Aux In @ 10 mV)

PHANTOM POWER +15 V DC

POWER AMPLIFIER SECTION

POWER OUTPUT 80W @ <0.03% T.H.D. + noise @ 1 kHz into 4 Ω
RATED LOAD IMPEDANCE 4 Ω
INPUT SENSITIVITY 34 mV

DIMENSIONS Height: 5.75 in 14.6 cm

Width: 17.5 in 43 cm
Depth: 10 in 25.5 cm

WEIGHT 20 lbs 9 kg

PRODUCT SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.

10

SPECIFICATIONS FOR THE LTB-10 SPEAKER ENCLOSURE

DESIGNATION TYPE PR 355

PART NUMBER 071-1710-000

FREQUENCY RESPONSE 75 Hz - 20 kHz

POWER HANDLING 60W

IMPEDANCE 8Ω

LF DRIVER 10” with 1.5” voice coil

HF DRIVER Piezoelectric Horn

SENSITIVITY 94 dB, 1W - 1M

MAXIMUM OUTPUT SPL @ 1 M 111dB continuous, 117 dB peak

CROSSOVER FREQUENCY 4 kHz

DIMENSIONS Height: 16.75 in 42.5 cm

Width: 12.75 in 32.4 cm
Depth: 11.75 in 29.8 cm

WEIGHT 16 lbs 7.3 kg

PRODUCT SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.

FENDER MUSICAL INSTRUMENTS CORP.

A PRODUCT OF:

CORONA, CA 91720 USA