Unika PA-180 Le manuel du propriétaire

Marque: Unika

Modèle: PA-180

Catégorie: Haut-parleurs de la barre de son

Taper: Le manuel du propriétaire

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User Instructions

This booklet contains important information concerning the proper and safe operation of your new amplifier..

PA-Series

PA-664 / PA-1804

Made in Taiwan

Professional Power Amplif iers

Index

02 Important Precautions

Introduction02

03 Front Panel

04 Rear Panel

05 Set Up

07 Operating Modes

09 Protection

10 Specications

UNiKA

Clip Clip Clip Clip

Signal Signal Signal Signal

POWER

CH 1

CH 2

CH 3

CH 4

Min Min Min MinMax Max Max Max

4Ch POW ER AMP

PA 66 4

UNiKA

Clip Clip Clip Clip

Signal Signal Signal Signal

POWER

CH 1

CH 2

CH 3

CH 4

Min Min Min MinMax Max Max Max

PA1804

4Ch POW ER AMP

UNiKA

1804

UNiKA PA-664/PA-1804

page 1

This symbol is intended to alert the user to the presence of

non insulated "dangerous voltage" within the product's

enclosure that may be of sufficient magnitude to constitute

a risk of electric shock to persons.

CAUTION: Risk of the electrical shock - DO NOT OPEN!

CAUTION: To reduce the risk of electrical shock, do not remove cover. No user serviceable parts inside. Refer all servicing

to qualified service personnel.

WARNING: To prevent electrical shock or fire hazard, do not expose this amplifier to rain or moisture. Before using this

amplifier read the user manual for further warnings.

This symbol is intended to alert the user of

the presence of important operating and

maintenance (servicing) instructions in the

literature accompanying the product.

Este símbolo tiene el propósito de alertar al usuario de la

presencia de “voltaje peligroso” que no tiene aislamiento

dentro de la caja del producto que puede tener una

magnitud sufciente como para constituir riesgo de corrientazo.

PRECAUCIÓN: Riesgo del choque eléctrico - NO SE ABRA

PRECAUCIÓN: Para disminuir el riesgo de choque eléctrico, no quite la cubierta. No hay piezas adentro que el usario puede

reparar. Deje todo mantenimiento al los técnicos cualifcados.

ADVERTENCIA: Para prevenir choque eléctrico o riesgo de incendios, no deja expuesto a la lluvia o a la humedad este amplif

cador. Antes de usar este amplif cador, lea mas advertencias en la guia de operacion.

Este símbolo tiene el propósito de alertar al

usuario de la presencia de instrucciones

importantes sobre la operación y

mantenimiento en la literatura que vienc con el producto.

Ce symbole est utilisé pur indiquer à l’utilisateur la présence

à l'intérieur de ce produit de tension non-isolée

dangereuse pouvant être d'intensité suffisante pour

constituer un risque de choc électrique.

ATTENTION: Risque de choc électrique - NE PAS OUVRIR!

ATTENTION: Afin de réduire le risque de choc électrique, ne pas enlever le couvercle. Il ne se trouve à l’intérieur aucune piéce

pouvant être réparée par l'utilisateur. Confier l'entretien à un personnel qualifé.

AVERTISSEMENT: Afin de prévenir les risque de décharge ou de feu, n’exposez pas cet appareil à la pluie ou à l’humidité.

Avant d’utiliser cet amplificateur, lisez les avertissements supplémentaries situés dans le guide.

Ce symbole est utilisé pour indiquer à l’utilisateur

qu'il trouvera d'importantes instructions

importantes sur l'utilisation et l'entretien de

l'appareil dans la littérature accompagnant le produit.

Dieses Symobl soll den Anwender vor unisollierten

gefährlichen Spannungen innerhalb des Gehäuses warnen,

die von Ausreichender Stärke sind, um einen elektrischen

Schlag verursachen zu können.

VORSICHT: Risiko - Elektrischer Schlag! Nicht öffnen!

VORSICHT: Um ddas Risiko eines elektrischen Schlages zu vermeiden, nicht die Abdeckung enfernen. Es befinden sich keine

Teile darin, die vom Anwender repariert werden könnten. Reparaturen nur von qualifzierte Fachpersonal

durchführen lassen.

ACHTUNG: Um einen elektrischen Schlag oder Feuergefahr zu vermeiden, sollte diesen Gerät nicht dem Regen oder

Feuchtigkeit ausgesetz werden. Vor Inbetriebnahme unbedingt die Bedienungsanleitung lesen.

Dieses Symobl soll den Benutzer auf wichtige

Instruktionen in der Bedienungsanleitung

aufmerksam machen, die Handhabung und

Wartung des Produkts betreffen.

CAUTION

Do not open -

risk of electric shock

CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO

NOT REMOVE THE COVER. THERE ARE NO USER

SERVICEABLE PARTS INSIDE. REFER ALL SERVICE TO

YOUR AUTHORIZED DEALER.

The lightning flash with an arrow triangular

symbol is intended to alert the user to the

presence of non insulated “dangerous

voltage” within the products enclosure, and

may be of sufficient magnitude to constitute

a risk of electric shock.

The exclamation point triangular symbol is

intended to alert the user to the presence of

important operating and maintenance

(servicing) instructions in the user manual

accompanying the amplifier.

FOR OPTIMUM PERFORMANCE AND RELIABILITY

DO NOT PRESENT THE AMPLIFIER WITH A

SPEAKER LOAD OF LESS THAN 2 OHMS OR ANY

COMBINATION OF SPEAKERS THAT TOGETHER ARE LESS

THAN 2 OHMS!

USING ONE SPEAKER, IT MUST BE RATED AT 4 OR MORE

OHMS. USING TWO SPEAKERS, THEY MUST RATED EACH AT 4

OR MORE OHMS.

USING THREE SPEAKERS, THEY MUST BE RATED EACH AT 8

OR MORE OHMS.

POUR ASSURER LA FIABILETE ET OBTENIT UNE

PERFORMANCE OPTIMALE, NESOUMETTE

JAMAIS L’AMPLIFICATEUR A UNE CHARGE

D’IMPEDANCE

TOTALE INFERIEURE A 2 OHMS, NI AVEC UN H.P. N EN

COMBINAISON DES H.P.

AVEC UN H.P., IL FAUT UNE CHARGE D’IMPEDANCE MINIMUM

DE 2 OHMS.

AVEC DEUX H.P., FAUT POUR CHAOUN UNE CHARGE

D’IMPEDANCE MINIMUM DE 4 OHMS.

AVEC TROIS H.P., FAUT POUR CHAOUN UNE CHURGE

D’IMPEDANCE MINIMUM DE 8 OHMS.

page 2

IMPORTANT PRECAUTIONS

 To reduce the risk of electrical shock or fire, do not expose this unit rain or

moisture.

 Do not spill water or other liquids into or on to your unit.

 Do not attempt to operate this unit if the power cord has been frayed or

broken.

 Do not attempt to remove or break off the ground prong from the electrical

cord. This prong is used to reduce the risk of electrical shock and f re in

case of an internal short.

 Disconnect main power before making any type of connection.

 Do not remove the cover under any conditions. There are no user

serviceable parts inside.

 Never plug this unit in to a dimmer pack.

 Always be sure to mount this unit in an area that will allow proper

ventilation. Allow about 6” (15cm) between this device and a wall.

 Do not attempt to operate this unit, if it becomes damaged.

 This unit is intended for indoor use only, use of this product outdoors voids

all warranties.

 During long periods of non-use, disconnect the unit’s main power.

 Always mount this unit in a safe and stable manner.

 Power cords should be routed so they are not likely to be walked on,

pinched by items placed upon or against them.

 Cleaning -The outside of the unit should be wipe down with a soft cloth and

mild cleaner when needed.

 Heat -The amplifier should be situated away from heat sources such as

radiators, heat registers, stoves, or other appliances (including amplifiers)

that produce heat.

 The fixture should be serviced by qualified service personnel when:

A. The power-supply cord or the plug has been damaged.

B. Objects have fallen, or liquid has been spilled into the unit.

C. The appliance has been exposed to rain or water.

D. The fixture does not appear to operate normally or exhibits a

marked change in performance.

Congratulations and thank you for purchasing PA-664/PA-1804 amplifier.

These amplifiers are representation of UNiKA’s continuing commitment to

produce the best and highest quality audio products at an affordable price.

These amplifiers are designed to provide a big impact in sound

reproduction. Please read and understand this manual completely before

attempting to operate your new amplifier. This booklet contains important

information concerning the proper and safe operation of your new amplifier.

UNPACKING: Every PA-664/PA-1804 amplifier has been thoroughly

tested and has been shipped in perfect operating condition. Carefully check

the shipping carton for damage that may have occurred during shipping. If

the carton appears to be damaged, carefully inspect your unit for any

damage and be sure all accessories necessary to operate the system have

arrived intact. In the event damage has been found or parts are missing,

please contact your dealer for further instructions.

INSTALLATION: These amplifiers are designed to mount into a

standard 19”rack. The front panel provides four holes used to screw the unit

into a rack. The unit also provides a way to rear mount the unit into a rack for

added security. Rear mounting the unit is especially recommended if the

unit is to mounted into a mobile rack.

INTRODUCTION

UNiKA PA-664/PA-1804

Important Precautions Introduction Front Panel Rear Panel Set Up Operating Modes Protection Specifications

FRONT PANEL

1. Rack Mounting Ears - Two front panel mounting holes are provided on

each mounting ear.

2. Rack Handle - PA Series amplifiers are designed with rack handle at

two each side. It's not only to make the entire design elegant but more

practical and convenient for users.

3. Fan Inlet Grills and Filter - PA Series amplifiers are cooled by two rear

mounted fans. Cool air from front grills is filtered and flows over the

heatsinks and exhausts to back side.

Make sure these outlets remain clear to allow unrestricted air flow.

4. AC Power Switch - PA Series amplifiers have a front-panel AC mains

power switch.

5. Power Indicator - This LED will glow when mains power is applied to

the unit. This light may continue to glow briefly after mains power has

been turned off, this is normal.

6. Channel 1-4 Signal Indicator - This LED indicates that a signal (above

a minimum threshold) is present at the amplifier input, and that the

signal is being amplified.

7. Channel 1-4 Clip Indicator - This LED will begin to flash when the

channel begins to overload (clip), at this point the channel will begin to

distort. Under heavy clipping activity, lower the channel's gain control to

reduce the risk of damage to your speakers and amplifier. This LED may

glow when the unit has been turned off, this is normal.

8. Channel 1-4 Gain Control - This rotary knob is used to control the

output signal level of the channel. Turning the knob in clockwise

direction will increase output signal level.

9. UNiKA Logo and Model No - PA Series have 2 types of 2U models PA-

664/PA-1804.

page 3

Figure 1

UNiKA PA-664/PA-1804

Clip Clip Clip Clip

Signal Signal Signal Signal

POWER

CH 1

CH 2

CH 3

CH 4

Min Min Min MinMax Max Max Max

4Ch POWER AMP

UNiKA

18 0 4

5 6 7 8 9

Important Precautions Introduction Rear Panel Set Up Operating Modes Protection Specifications Front Panel

10. Fan Outlet Ports - Dual 2-speed cooling fans. Cooling air enters the

amplifier through the front grills and exhausts through the fans. Be

sure not to block these ports when installing the amplifier or other

associated equipment. Air must flow unimpeded through these ports.

11. Channel 1-4 Balanced 1/4" TRS & XLR Input Connectors - This is

the input terminal of the audio signal that can be connected to the

balanced 1/4” TRS and XLR input plugs.

XLR pin setting: Pin-3/signal negative, Pin-2/signal positive, Pin-

1/ground;

TRS pin setting: TIP/signal positive, RING/signal negative,

SLEEVE/ground

12. Channel 1-4 Output Jack / 5-Way Binding Post - Connect each

speaker to channel 1-4 output terminal respectively. Red is positive

signal and Black is negative signal.

13. Parallel Input Switch - Input signal of channels 1 and 2, 2 and 3, or 3

and 4 in parallel mode. When switch “ON”, it's “Parallel Mode” state,

otherwise it's “Stereo Mode” state when switch “OFF”.

14. Mono Bridge Switch - Input signal of channel 1 and 2 or 3 and 4 in

bridge mode. When switch “ON”, it's “Bridge Mode” state, otherwise

it's “Stereo Mode” state when switch “OFF”.

15. Channel 3 Subwoofer Mode ON/OFF Switch - This switch will enable

the channel 3 to be a subwoofer channel or bypass the subwoofer

function.

16. Channel 3 Frequency Adj. - This pot adjust the frequency level from

20Hz to 200Hz sent to your speaker on channel 3 when using your

amplifier in subwoofer mode.

17. Ground Lift Switch - This switch is used to disconnect the internal

ground signal from the amplifier chassis ground. This may reduce the

buzz that is caused from an electrical 50Hz/60Hz cycle.

18. Breaker - This breaker is an AC protection circuit from short circuit.

Just press the switch to reset it.

19. AC Power Input - Plug this cable in to a standard 110 or 220V wall

outlet. Be sure that supplied voltage matches that of the required

voltage of your amplifier. Never plug your amplifier in to a wall outlet

that does not match the required voltage of your amplifier, serious

damage may occur to your unit.

REAR PANEL

page 4

Figure 2

UNiKA PA-664/PA-1804

CH4 & CH3 CH2 & CH1

CH 4 CH 3

INPUT

PARALLEL

INPUT

PARALLEL

BRIDGE BRIDGE

CH 1CH 2

CH-3

CH-4

+ +

BRIDGE

MONO

BRIDGE

MONO

CH-1

CH-2

AC IN

BREAKER

RESET

4 CHANNEL INPUT BALANCE

CAUTION

2 OHMS MINIMUM IMPEDANCE PER CHANNEL

4 OHMS MINIMUM IMPEDANCE IN MONO BRIDGE MODE

GROUND

LIFT

200Hz20Hz

~120VAC 60Hz

1500 WATTS

FREQUENCY

SUB WOOFER

ON / OFF

CH3 & CH2

PARALLEL

CH 4 CH 3

CH 2 CH 1

17 19

15161413 13 1413

Important Precautions Introduction Front Panel Set Up Operating Modes Protection Specifications Rear Panel

INPUTS - The PA Series amplifier allows you to use two types of input connectors per channel, a XLR female jack for balanced connections

and a 1/4” TRS female jack that will accept balanced and unbalanced connectors. Use these connections to connect the output signal from a

mixer, cross-over or EQ to your PA Series amplifiers. A balanced connection is recommended for cable runs longer than 20ft. When constructing

your own XLR cables follow the pin configuration described below for proper connections. For cable runs shorter than 20ft., you may choose the

1/4” TS unbalanced input option. The 1/4” TS unbalanced input option may be more convenient for most users due to the abundant supply of

prefabricated cables available at your local audio dealer.

BINDING POST/BANANA PLUG: Connect your speakers to the binding post outputs on the rear of the amplifier. The speaker wire may be

connected by bare wire (directly connected, usually for permanent connections), banana plug, or spade connector. Connections are made to

channel one and channel two outputs for Stereo Mode or across the red terminals of channel one and channel two for Mono Bridge Mode.

IMPORTANT NOTICE: Although a speaker will operate with the positive and negative leads plugged into either terminal on the amplifier binding

post, be sure to plug the negative lead into the black terminal and positive lead into the red terminal. Ensuring proper polarity will avoid speakers

being out of phase that can cause a loss of bass response.

2 Hot (+data)

Male XLR Pin Configuration

Figure 3

1 Ground / Return / 0v

3 Negative (-data)

Balanced TRS 1/4” Plug

Hot (+)

Negative (-)

Ground/Shield

Figure 4

Unbalanced TS 1/4” Plug

Hot (+)

Negative (-)

Figure 5

page 5

SET UP

OUTPUTS -

UNiKA PA-664/PA-1804

Important Precautions Introduction Front Panel Rear Panel Operating Modes Protection Specifications Set Up

When connecting your speakers to the amplifier using bare wire, unscrew the red and black caps on the

binding post, be sure not to completely remove or unscrew the red and black caps. Strip back the wire

insulation 1/2” (13mm). Insert the bare wire into the hole that was revealed by unscrewing the binding

post cap. After inserting the wire into the binding post hole, screw the binding post cap down on the wire.

To reduce the risk of shock or damage to your amplifier, be sure that the wire connected to one binding

post does not come in contact with that of another.

SPADE CONNECTOR : (Figure 8)

When connecting your speakers to the amplifier using spade connector; unscrew the red and black caps

on the binding post, be sure not to completely remove or unscrew the red and black caps. Insert the spade

connector into the binding post and tighten the caps down on the spade connector. To reduce the risk of

shock or damage to your amplifier, be sure that the wire connected to one binding post does not come in

contact with that of another.

MONO BRIDGE CONNECTIONS : (Figure 9)

Mono bridge operation connections will follow the above descriptions, however, when operating in mono

bridge operation the speaker connections will run between the two positive (red) leads. Use channel two

positive output terminal for the negative connection and the channel one positive output terminal for the

positive connection.

page 6

BARE WIRE CONNECTION : (Figure 7)

BANANA PLUG : (Figure 6)

When connecting your speakers to the amplifier using banana plugs, be sure that the red and black

caps on the binding post are completely screwed in. Insert the banana plugs into the caps of the binding

post, be sure that the banana plugs are inserted securely to avoid the risk of popping out.

UNiKA PA-664/PA-1804

Typical speaker output using bare wire.

Insert bare wire into the binding post and tighten.

Typical speaker output using spade connectors.

Insert bare wire into the binding post and tighten.

Figure 8

1/5"

13mm

Figure 7

Figure 6

Figure 9

BRIDGE

MONO

CH-1

CH-2

4 CHANNEL INPUT BALANCE

CAUTION

2 OHMS MINIMUM IMPEDANCE PER CHANNEL

4 OHMS MINIMUM IMPEDANCE IN MONO BRIDGE MODE

200Hz

FREQUENCY

CH 2 CH 1

Important Precautions Introduction Front Panel Rear Panel Operating Modes Protection Specifications Set Up

page 7

OPERATING MODES

STEREO OPERATION : Connect your inputs into channels one and two, also channels three and four of the amplifier. Connect your speakers to the outputs on

the rear of the amplifier. Be sure that your front gain controls are turned down to their lowest level (fully counterclockwise). Turn your amplifier on. Turn your input

source level up. Use your front gain controls to regulate the output volume. Be sure not to raise the volume to the clip level, however an intermittent clip signal is

acceptable.

MONO BRIDGE OPERATION : Be sure your amplifier and all other audio equipment are powered down. Press the Bridge button. Connect input signals to

channels one and two, or three and four. Connect your speaker across the red output binding post on the rear of your amplifier. Turn your equipment on (your amplifier

should always be the last item you turn on). Apply an input source signal to your amplifier. Use the channel one and three gain controls to regulate your amplifier output.

PARALLEL MONO : Parallel ties each two channel line inputs together, channels one and two, two and three or three and four, that they will be driven by the same

signal, without the need for external jumpers or wiring. Four amplifier channels will operate independently. Though they carry the same signal, their gain controls affect

only their respective channels, and they both must use their respected speaker outputs. Never attempt to parallel the speaker outputs, this may cause serious damage

to your amplifier! To run in parallel mono mode connect your system as you would if you were going to run in stereo mode. Then press the Parallel button. Be sure the

amplifier is off or the power is disconnected before making any changes.

SUBWOOFER MODE : This mode sends low frequencies to your speakers without the use of an external cross-over. The subwoofer operation can be operated in

mono only. Set the subwoofer mode switch of the channel three to the “ON” position. Use the frequency selector to adjust the subwoofer output frequency from 20Hz to

200Hz. In addition, the channel two and channel three “PARALLEL” switch sets these two channels in parallel mode, therefore when the “Subwoofer” switch is set to

ON, channel two will simultaneously operated as a subwoofer channel same as channel three.

ONE CHANNEL NORMAL / ONE CHANNEL SUBWOOFER (BI-AMP) - You may also use your amplifier to bi-amp your system. You may use one side of the amplifier

to power a subwoofer and the other side to power a full range speaker. Follow the set-up guides listed above to mix and match your operations.

UNiKA PA-664/PA-1804

Figure 10 Mono Bridge Mode Connection

MONO SUBWOOFER SPEAKER

SPEAKER IMPEDANCE MINIMUM 8 OHM

Set to Bridge

Negative (-) Lead

Positive (+) Lead

PA-1804 Rear Panel

Set to Bridge

MONO SUBWOOFER SPEAKER

SPEAKER IMPEDANCE MINIMUM 8 OHM

Negative (-) Lead

Positive (+) Lead

CH4 & CH3 CH2 & CH1

CH 4 CH 3

INPUT

PARALLEL

INPUT

PARALLEL

BRIDGE BRIDGE

CH 1CH 2

CH-3

CH-4

+ +

BRIDGE

MONO

BRIDGE

MONO

CH-1

CH-2

AC IN

BREAKER

RESET

4 CHANNEL INPUT BALANCE

CAUTION

2 OHMS MINIMUM IMPEDANCE PER CHANNEL

4 OHMS MINIMUM IMPEDANCE IN MONO BRIDGE MODE

GROUND

LIFT

200Hz20Hz

~120VAC 60Hz

1500 WATTS

FREQUENCY

SUB WOOFER

ON / OFF

CH3 & CH2

PARALLEL

CH 4 CH 3

CH 2 CH 1

Important Precautions Introduction Front Panel Rear Panel Set Up Protection Specifications Operating Modes

page 8

UNiKA PA-664/PA-1804

PA-1804 Rear Panel

Negative (-) Lead

Positive (+) Lead

Negative (-) Lead

Positive (+) Lead

Negative (-) Lead

Positive (+) Lead

STEREO MODE FULL RANGE CONNECTION

SPEAKER IMPEDANCE MINIMUM 4 OHM

Set to Bridge

MONO BRIDGE MODE CONNECTION

SPEAKER IMPEDANCE MINIMUM 8 OHM

(Can be Set as A Subwoofer Channel)

Figure 11

CH4 & CH3 CH2 & CH1

CH 4 CH 3

INPUT

PARALLEL

INPUT

PARALLEL

BRIDGE BRIDGE

CH 1CH 2

CH-3

CH-4

+ +

BRIDGE

MONO

BRIDGE

MONO

CH-1

CH-2

AC IN

BREAKER

RESET

4 CHANNEL INPUT BALANCE

CAUTION

2 OHMS MINIMUM IMPEDANCE PER CHANNEL

4 OHMS MINIMUM IMPEDANCE IN MONO BRIDGE MODE

GROUND

LIFT

200Hz20Hz

~120VAC 60Hz

1500 WATTS

FREQUENCY

SUB WOOFER

ON / OFF

CH3 & CH2

PARALLEL

CH 4 CH 3

CH 2 CH 1

STEREO MODE FULL RANGE CONNECTION

PARALLEL MODE FULL RANGE CONNECTION

SPEAKER IMPEDANCE MINIMUM 4 OHM

PA-1804 Rear Panel

Negative (-) Lead

Positive (+) Lead

Negative (-) Lead

Positive (+) Lead

SPEAKER IMPEDANCE MINIMUM 4 OHM

Set to Parallel

Negative (-) Lead

Positive (+) Lead

Negative (-) Lead

Positive (+) Lead

Figure 12

CH4 & CH3 CH2 & CH1

CH 4 CH 3

INPUT

PARALLEL

INPUT

PARALLEL

BRIDGE BRIDGE

CH 1CH 2

CH-3

CH-4

+ +

BRIDGE

MONO

BRIDGE

MONO

CH-1

CH-2

AC IN

BREAKER

RESET

4 CHANNEL INPUT BALANCE

CAUTION

2 OHMS MINIMUM IMPEDANCE PER CHANNEL

4 OHMS MINIMUM IMPEDANCE IN MONO BRIDGE MODE

GROUND

LIFT

200Hz20Hz

~120VAC 60Hz

1500 WATTS

FREQUENCY

SUB WOOFER

ON / OFF

CH3 & CH2

PARALLEL

CH 4 CH 3

CH 2 CH 1

Important Precautions Introduction Front Panel Rear Panel Set Up Protection Specifications Operating Modes

page 9

PROTECTION

1. SWITCH ON MUTE PROTECTION - The mute circuit is used at the inputs when the unit switched ON, output of between a few seconds the amplifier will

be muted. This is done so that turn-on/off noises from mixers and other gear is blocked in case the entire system is powered up at once.

2. SHORT CIRCUIT PROTECTION - The PA series comes with built-in Output Short Circuit Protects. The Output Short

Circuit Protection protects the output devices of the amplifier from short circuits and stressful loads. If your speaker lines

shorted, the amplifier automatically detects this problem and discontinued operation for that channel. If one side of your

amplifier becomes shorted and goes into protect mode, the other side will continue to operate normally. Channel output during

the “Short Circuit Protection" will be interrupted (i.e. no sound output). Short Circuit Protection can usually be traced back to the

signal output line (i.e. speaker line). Check the line from the output terminal of the amplifier to the speaker. If this line is good,

check the internal speaker connections and components. A short circuit will usually be traced to a bad cable or a bad speaker

component and is rarely traced to the amplifier itself.

UNiKA PA-664/PA-1804

3. OVERHEATING PROTECTION - The PA series amplifiers are cooled by Dual 2-speed fans, and always are kept at moderate temperature. During low

level output the fans run at normal speeds. During high output and as heat raises, (exceeding 50°C.), the fans will run at higher speeds to aid the cooling process.

If the heatsink temperature exceeds 91°C., the amplifier will mute until the amplifier cools down. When the amplifier cools below 90°C., the amplifier will return to

normal operations. Be sure not to operate your amplifier below the minimum load ratings to reduce the risk of overheating problems.

4. DC CIRCUIT PROTECTION - If dangerous subsonic frequencies or direct current (DC) is detected in the amplifier's output, the unit will activate its DC/low-

frequency protection circuitry and the amplifier will be muted. This protects the loads and prevents oscillations. The unit will resume normal operation while the

amplifier no longer detects dangerous low-frequency or DC output.

Important Precautions Introduction Front Panel Rear Panel Set Up Operating Modes Specifications Protection