Fender Speaker System P N 051923 User Manual

PORTABLE  
SOUND SYSTEMS  
From Fender Pro Audio  
Owner's Manual for  
LTB Portable Sound System  
P/N 051923  
REV B  
 
THE FENDER LTB  
PORTABLE POWERED  
MIXER  
INTRODUCTION  
The LTB: an 80 watt professional powered mixer  
80 Watts into 4  
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.  
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  
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.  
Patch Points for Line Level Outboard Gear  
Full-bodied Spring Reverb  
Everything You Need to Get Started:  
LTB Mixer / Amplifier  
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.  
One Dynamic Cardiod Microphone  
One Microphone Cable  
Two Speaker Cables  
Two Full-Range Speaker Enclosures  
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  
A
C
B
D
E
A. EQ - Adjusts the tone / frequency boost or cut of D. HIGH Z - Plug your high impedance  
its respective channel. When the tone control is set microphones, keyboards, drum machines, outboard  
at the 12 o’clock (notched) position, the channel is effects, etc. in here. This 1/4 inch, TS unbalanced  
“flat” with no frequencies cut or boosted. As the dial input jack is suited for use with items having line  
is rotated clockwise, the treble response increases. level outputs.  
Likewise, as the dial is rotated counterclockwise the  
treble response decreases.  
E. LOW Z - Plug your microphone in here. This  
three pin XLR balanced female input connector is  
B. EFX - This knob controls the amount of signal its intended for input signals from low impedance  
respective channel sends to the EFX output jack for microphones. Pins 2 and 3 automatically provide  
external signal processing devices and to the internal Phantom Power (+15V DC) for some condenser  
reverb pan. When the knob is set at 0, no signal is style microphones.  
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.  
4
 
MASTER CONTROL PANEL FUNCTIONS  
F
B
C
A
G
F. POWER LED - This LED  
illuminates when the LTB is on.  
D
E
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.  
H
I
J
K
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.  
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.  
B. MID - Adjusts the amount of middle frequency  
boost or cut in the overall mix.  
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.  
C. HIGH - Adjusts the amount of high frequency  
boost or cut in the overall mix.  
D. MAIN - The main volume control of the LTB.  
Rotating the knob clockwise increases the LTB’s  
overall volume level.  
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.  
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. POWER SUPPLY CORD M. PARALLEL SPKR  
M
L
- This is a grounding type JACKS  
-
These  
supply cord to reduce the speaker level output  
possibility of shock hazard. jacks feed your main  
Completely unwind the cord speaker enclosures.  
from its cord wrap to prevent Remember, the total  
blocking air flow. Be sure to minimum impedance  
8 0 W  
4 M IN. LOAD TOTAL  
connect the cord to a load is 4 ohms. Connecting a load of less than 4  
grounded receptacle. DO ohms may result in unsatisfactory performance such  
NOT ALTER THE AC PLUG. as overheating to the point of thermal shutdown.  
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.  
Stereo Cassette  
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This full page illustration can be found on page 8.  
4. Next, plug the supply cord into a power source  
with the correct voltage.  
7. Turn all instruments, outboard gear and other  
equipment ON before powering up the LTB.  
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.  
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  
8 0 W  
4 M IN. 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.  
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
 
GROUNDING AND HUMS  
TROUBLESHOOTING  
Ground loops are one of the most  
common causes of hum and buzz in  
sound reinforcement systems and other  
If the LTB is set up but does not  
function, please check the following  
items:  
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.  
• 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?  
1. Keep all electronics connected to the sound  
system on the same electrical circuit.  
• Are the volume control knobs on your instruments  
turned above their minimum position?  
• Is the mic/instrument properly plugged into the  
LTB ?  
2. Keep audio signal cables away from the AC  
power cords.  
• 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?  
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.  
(If applicable) does your instrument have power?  
VINYL COVERING CARE  
If after checking all of the above the LTB is still not  
performing correctly, consult your nearest authorized  
Fender Service Center.  
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.  
7
 
SIMPLE LTB SETUP  
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1. Connect the speaker cords from the PARALLEL 3. The LEVEL control in each channel strip adjusts  
SPKR JACKS to the LTB-10 speakers.  
the amount of signal sent to the main bus where all  
channel signals are summed. The MAIN knob in  
2. Connect a microphone to a LOW Z input jack and the master section adjusts the volume level to the  
any keyboard or other instrument to a HIGH Z input main speakers.  
jack.  
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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1. Connect speakers, microphones and other 3. The EFX knob on each channel adjusts the  
equipment to the LTB as before.  
amount of signal sent to the EFX jack where the  
signal is then sent to the processor.  
2. Next, connect a cord from the EFX jack to the input  
on the effects processing unit. Return the signal to 4. Be sure to turn on the tape deck, keyboard or  
the LTB by connecting a cord from the output of the other instruments and outboard gear before  
effects unit to the AUX IN jack on the LTB.  
powering up the LTB.  
9
 
SPECIFICATIONS FOR THE LTB POWERED MIXER  
DESIGNATION TYPE  
PART NUMBER  
PR 345  
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  
LINE INPUT IMPEDANCE  
MIC INPUT SENSITIVITY  
LINE INPUT SENSITIVITY  
2.7 k  
100 kΩ  
2 mV  
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  
POWER AMPLIFIER SECTION  
POWER OUTPUT  
+15 V DC  
80W @ <0.03% T.H.D. + noise @ 1 kHz into 4 Ω  
RATED LOAD IMPEDANCE  
INPUT SENSITIVITY  
4 Ω  
34 mV  
DIMENSIONS  
Height: 5.75 in  
Width: 17.5 in  
Depth: 10 in  
14.6 cm  
43 cm  
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  
PART NUMBER  
PR 355  
071-1710-000  
75 Hz - 20 kHz  
60W  
FREQUENCY RESPONSE  
POWER HANDLING  
IMPEDANCE  
8Ω  
LF DRIVER  
10” with 1.5” voice coil  
Piezoelectric Horn  
94 dB, 1W - 1M  
111dB continuous, 117 dB peak  
4 kHz  
HF DRIVER  
SENSITIVITY  
MAXIMUM OUTPUT SPL @ 1 M  
CROSSOVER FREQUENCY  
DIMENSIONS  
Height: 16.75 in  
Width: 12.75 in  
Depth: 11.75 in  
42.5 cm  
32.4 cm  
29.8 cm  
WEIGHT  
16 lbs  
7.3 kg  
PRODUCT SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.  
A PRODUCT OF:  
FENDER MUSICAL INSTRUMENTS CORP.  
CORONA, CA 91720 USA  
 

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