4500
Troubleshooting Guide
Owner’s Manual
Liberty
ANCHOR Audio, Inc. (31 0 ) 784-2300
100-0005-000 / Revision F, 03/97
Having trouble with the sound system?
Condition Possible Cause
No sound (power LED not lit):
• power switch OFF
• batteries fully discharged (LED flashes briefly)
Charge indicator doesn’t light: • blown fuse
No sound
(power LED lights): • no output from source
• input cable unplugged
• input volume control low or off
• plug inserted into switched speaker output,
but no speaker connected
Shortened battery life: • short in external speaker cable or speaker
• total external speaker impedance < 4Ω
• batteries not fully charged
• batteries need replacement
Distorted sound: • poor connection on input cable
• input signal too strong
Excessive hum or noise: • input cable not shielded
• not using balanced microphone
Having trouble with the wireless system?
Condition Possible Cause
No sound (TX ON indicator lights): • mute switch set to ‘mute’ position
• wireless volume control low or off
• no mic plugged into belt-pack transmitter
No sound
(TX ON indicator off): • sound system not turned on
• transmitter power switch turned off
• low battery or no battery in transmitter
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Important Safeguards Specifications
15
MPA-4500
Rated power output: 70 watts @ 4Ω continuous
120 watts @ 4Ω dynamic
Max SPL @ rated power: 119 dB project mode, 109 dB music mode
MPB-4500
Rated power output: 50 watts @ 4Ω continuous
Max SPL @ rated power: 117 dB project mode, 107 dB music mode
Batteries (two): 12 Volt rechargeable, 2.6 AH
(7.0 AH with heavy duty batteries)
General
Frequency response: 60 Hz - 15 kHz ±3 dB music mode
(project mode: + 10 dB from 1.5 - 12kHz)
Speaker type: 8" woofer, titanium dome compression driver
Inputs
Microphone inputs (two): Lo-Z (1 kΩ), balanced, XLR
phantom powered, 12 VDC / 6.8 k
Auxiliary (line) input: Hi-Z (10 kΩ), unbalanced, 1⁄4"-phone
Sensitivity for rated output:
Microphone: -52 dBV (2.5 mVrms)
Auxiliary (line): -14 dBV (200 mVrms)
Outputs
Line output (post fader): Lo-Z (< 1 kΩ), buffered, 1⁄4"-phone
Speaker out; switched: 8Ω, 1⁄4"-phone
Speaker out; unswitched: 4Ω, 1⁄4"-phone
DC Output: 12 Volts DC, 300 ma max.
AC power requirements: 110-125 V AC, 50/60 Hz
Export model: 208-240 VAC, 50/60 Hz
(MPA: 120 watts max, 30 watts idle.
MPB: 50 watts max)
Dimensions (HWD) : 22.5 x 13 x 10", 57 x 33 x 25 cm
Weight:
MPA-4500: 31 pounds, 13 Kg.
MPB-4500: 36 pounds, 16 Kg.
MPB-4500H: 44 pounds, 20 Kg.
Specifications subject to change without notice.
CAUTION: To reduce the risk of electric shock, do not remove the cover.
No user-serviceable parts inside. Refer servicing to qualified personnel.
WARNING: To prevent fire or electric shock, do not expose this equipment to
rain or moisture.
ATTENTION: Pour eviter les risques de choc électrique, ne pas enlever le
couvercle. Aucun entretien de pièces intérieures par l'usager. Confier
l'entretien au personnel qualifié.
AVIS: Pour eviter les risques d'incendie ou d’électrocution, n'exposez pas cet
article à la pluie ou a l'humidité.
EXPLANATION OF GRAPHICAL SYMBOLS
The lightning flash with arrowhead symbol, within an equilateral triangle, is
intended to alert the user to the presence of uninsulated “dangerous
voltage” within the product’s enclosure that may be of sufficient magnitude
to constitute a risk of electric shock to humans.
The exclamation point, within an equilateral triangle, is intended to alert the
user to the presence of important operating and maintenance (servicing)
instructions in the literature accompanying the appliance.
EXPLICATION DES SYMBOLES GRAPHIQUES
Le symbole éclair avec point de flèche à l'intérieur d'un triangle équilatéral
est utilisé pour alerter l'utilisateur de la presence à l'intérieur du coffret de
“voltage dangereux” non isolé d'ampleur suffisante pour constituer un risque
d'elétrocution.
Le point d'exclamation à l'intérieur d'un triangle équilatéral est employé pour
alerter les utilisateurs de la présence d'instructions importantes pour la
fonctionnement et l'entretien (service) dans le livret d'instruction
accompagnant l'appareil.
DATE OF MANUFACTURE
The date of manufacture of this Anchor Audio product can be determined by
the seven or eight digit serial number code. The fifth and sixth digits from the
right denote the year, the seventh digit (letter) from the right denotes the
month (A=Jan, B=Feb, etc.) Example: "XD960083" states that the unit was
manufactured in April of 1996. An "X" may or may not exist as the eighth
digit (letter) and has no significance in the serial number or date code.
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION
RISQUE DE CHOC
ELECTRIQUE
NE PAS OUVRIR
AVIS
100-05-0/F, LIB 2/6/01 9:26 AM Page 3
Quick Use Guide
Liberty is a portable sound system with a built-in amplifier
and multiple inputs. The dual-function feature makes it
suitable for music or speech applications, indoors or out.
You’ll need a microphone or some other input source before
you get started. If you have a battery-powered model, make
sure the batteries are fully charged before use (see page 11).
Here’s how easy it is to use
1. Set the unit in front of your audience on the floor ,
table or on a speaker stand.
2. Plug a microphone into the Mic 1 or Mic 2 input,
or plug an audio source into the auxiliary input.
3. Set all input level controls to minimum, and set the
bass and treble controls to the 12:00 position.
4. Turn the pow er switch ON (plug in the pow er cor d if
you’ re using an AC model). Slowly increase the level
control adjacent to the input used until desired volume
is reached.
5. For music and indoor applications, set the mode
switch to Music.
For speech and outdoor applications, set the mode
switch to Project.
6. Adjust the bass and treble for desired sound quality .
To operate the wireless mic system on wireless models, see
“Wireless Operation ” on pages 12 and 13. And for more detailed
instructions, see the “Operation” section beginning on page 8.
Problems?
Consult the
troubleshooting
section on the
back page of
this manual.
Thank you for choosing an Anchor Audio portable sound system. Our products
incorporate state-of-the-art design and the finest quality of materials and
workmanship. We’re proud of our products and appreciate the confidence which
you have shown by selecting an Anchor system.
I hope you’ll take a few of minut es t o review this manual. We’ve incorporated
several unique features into our products, and your knowledge of how to use
them will enhance the performance and your enjoyment of the system.
David Jacobs, President on behalf of all Anchor employees
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Accessories
MIC-90 Handheld Microphone
Anchor’s dynamic, balanced, low impedance microphone
with a unidirectional pick-up pattern. It has an on/off switch
and comes with a 20' cable and mic clip.
SS-450 Speaker Stand
Made of heavy duty structural aluminum.
MP-4501 Companion Speak er
Dual function (music/project) unpowered speaker which can
be connected to the speaker outputs of a Liberty for increased
crowd coverage. Speak er cable not included.
SC-50 Speaker Cable
Heavy duty 50' speaker cable.
VL-45 Storage Cover
Heady duty cover for Liberty.
MSB-201 Microphone Stand and Boom
Microphone floor stand with 33" adjustable boom.
FL-4500 Admiral Lectern
Floor model lectern with a center console to accommodate a
Liberty sound system. It has a shock-mounted mic input.
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