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Operation Manual
Quad Amplifier
QD-4240/4480/4960
QX-4960
* Rack mount products in the Western Hemisphere(North America, South America, and the Caribbean) do not have handles installed due to customer preference.
QUAD AMPLIFIER
Contents |
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Welcome .......................................................................................................................................... |
1 |
Installation |
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Environment.................................................................................................................................... |
2 |
Important Safety Instructions............................................................................................................. |
2 |
Features............................................................................................................................................ |
3 |
Operation ........................................................................................................................................ |
3 |
Suggested Applications................................................................................................................. |
3 |
Front Panel ...................................................................................................................................... |
4 |
Rear Panel ....................................................................................................................................... |
5 |
Speaker Connections .................................................................................................................... |
8 |
Speaker Connection Procedures ............................................................................................... |
12 |
Troubleshooting ........................................................................................................................... |
14 |
Applications ................................................................................................................................. |
15 |
Block Diagram .............................................................................................................................. |
18 |
Specifications ................................................................................................................................ |
22 |
Service |
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Procedures.................................................................................................................................... |
23 |
Schematic ..................................................................................................................................... |
23 |
Parts List ....................................................................................................................................... |
23 |
Variations and Options ............................................................................................................... |
23 |
Warranty ....................................................................................................................................... |
23 |
QUAD AMPLIFIER
Welcomel
A personal welcome to you from the management and employees of Inter-M
All of the co-workers here at Inter-M are dedicated to providing excellent products with inherently good value, and we are delighted you have purchased one of our products.
We sincerely trust this product will provide years of satisfactory service, but if anything is not to your complete satisfaction, we will endeavor to make things right.
Welcome to Inter-M, and thank you for becoming part of our worldwide extended family!
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK.
DO NOT REMOVE COVER (OR BACK).
NO USER-SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
WARNING
To prevent fire or shock hazard, do not expose the unit to rain or moisture.
This symbol 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 persons.
This symbol is intended to alert the user to the presence of important operation and maintenance (servicing) instructions in the literature accompanying the appliance.
Caution: To prevent electric shock do not use this (polarized) plug with an extension cord, receptacle or other outlet unless the blades can be fully inserted to prevent blade exposure.
Attentions: Pour prévenir les chocs électriques ne pas utiliser cette fiche polarisée avec un prolongateur, une prise de courant on une autre sortie de courant, sauf si les lames peuvent étre insérées à fond sans en laisser aucune partie à découvert.
*Do not install this equipment in a confined space such as a book case or similar unit.
*The apparatus shall not be exposed to dripping or splashing and no objects filled with liquids, such vases, shall be placed on the apparatus. *Worded: “WARNING FOR YOUR PROTECTION PLEASE READ THE FOLLOWING-WATER AND MOISTURE: Unit should not be used near water(e.g. near a bathtub, washbowl, kitchen sink, laundry tub, in a wet basement, or near a swimming pool, etc). Care should be taken so than objects do not fall and liquids are not spilled into the enclosure through openings.”
QD -4240/4480/4960, QX-4960 1
QUAD AMPLIFIER
Unpacking
Although your QD-4240/4480/ 4960/ QX-4960 is neither complicated nor difficult to operate, we recommend you take a few minutes to read this brief manual and familiarize yourself with the important information regarding product features, setup and operation.
As with most electronic devices, we strongly recommend you retain the original packaging. In the unlikely event the product must be returned for servicing, the original packaging (or reasonable equivalent) is required.
InstallationI t ll ti
Environment
Never place this product in an environment which could alter its performance or reduce its service life. Such environments usually include high levels of heat, dust, moisture, and vibration.
Important Safety Instructions
1.Read these instructions.
2.Keep these instructions.
3.Heed all warnings.
4.Follow all instructions.
5.Do not use this apparatus near water.
6.Clean only with dry cloth.
7.Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.
8.Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
9.Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.
10.Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.
11.Only use attachments/accessories specified by the manufacturer.
12.Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.
13.Unplug this apparatus during lightning storms or when unused for long periods of time.
14.Refer all servicing to qualified service personnel. Servicing is required when the
apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
S3125A
S3125A
2 QD -4240/4480/4960, QX-4960
QUAD AMPLIFIER
Featurest
-FOUR CHANNEL AMPLIFIER
Four channels in a single chassis.
-ADVANCED PROTECTION CIRCUITRY
Thermal overload protection, DC detection circuitry and power-on delay help protect your amplifier and system components.
-BRIDGED MONO OPERATION
Can operate in monaural mode for high-power and performance.
-SLIM DESIGN, COMPACT SIZE
Streamlined design fits in a compact 2RU space.
-INTEGRATED CROSSOVER
The QX-4960 features a built-in crossover for easy and convenient system integration.
Accessories
One detachable AC power cord is provided for use with this product.
Operationi
Make certain that speakers and input sources are properly connected before switching on.
Keep volume levels at minimum gain before switching on.
NOTE: The system’s operation is delayed by approximately three seconds after pressing the AC Mains power switch. This is due to the built-in protection circuitry, designed to protect speakers and other system components.
Suggested Applicationsli i
-Home Theater/Multimedia
-Surround-Sound Playback or Mixing
-Stereo System with Subwoofer
-Distributed Sound Installations
QD -4240/4480/4960, QX-4960 3
QUAD AMPLIFIER
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1. PROTECTION INDICATOR
This LED indicates the state of the amplifier’s protection circuitry. When the Protection LED is on (illuminated), the protection circuitry is active, indicating that the unit is not operating normally. This is typically due to overheating or power limiting. Please check the Input and Output condition of the amplifier.
2. CLIP INDICATORS
These LEDs light when the channel’s level reaches approximately 0.5%, indicating excessive input levels. When the Clip Indicators glow steadily, reduce the input to the amplifier.
3. SIGNAL INDICATORS
These LEDs light when the channel’s level exceeds approximately 2Vrms, indicating the presence of audio signal input to the amplifier channel.
4. INPUT ATTENUATORS
These are 21-step detented input signal attenuators, used to increase or decrease the input level to the amplifier.
5. HANDLES
Heavy-duty handles are provided to easily carry or position the amplifier.
6. POWER SWITCH
This switch switches the unit on, as indicated by the Power LED directly above the switch.
4 QD -4240/4480/4960, QX-4960
QUAD AMPLIFIER
Reall Panell
- QD-4240/4480
A NOTE ABOUT VENIILATION : The fan vents provide hot air out of the unit. It is important to keep them free of obstructions, to prevent the unit from overheating. It us also important to operate the unit in a dust-free environment.
- QD-4960, QX-4960
1. AC POWER INPUT
Connect the supplied standard AC input cable here.
2. AUDIO INPUTS 1-4
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hybrid XLR/TRS jacks. The XLR connectors |
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are wired with Pin 1 as Ground, Pin 2 as |
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QD -4240/4480/4960, QX-4960 5
QUAD AMPLIFIER
The TRS connectors are wired as Tip as hot (+), Ring as cold (-), and sleeve as ground, as shown below.
COLD
GROUND HOT
3. SPEAKER OUTPUT TERMINALS
These five-way binding posts are used to connect speakers to the unit. Do not connect the two outputs of a single channel by connecting them together, or in parallel with any other amplifier.
Speakers may be connected in Stereo or Bridged Mono mode. Pleaser refer to the illustrations below.
- STEREO MODE |
- BRIDGED MODE |
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4. MODE SELECTOR
Use this switch to select the amplifier’s mode of operation.
-STEREO MODE
In this mode, each channel operates independently, with channels 1 and 2 operating as a stereo pair, and channels 3 and 4 operating as a second stereo pair. In this mode the minimum speaker impedance is 4Ω.
-BRIDGED MODE
In this mode, all four channels are bridged together and function as a single mono amplifier. In this mode the minimum speaker impedance is 8Ω. (Note that in this mode the volume controls for channels 2 and 4 are inactive.)
-PARALLEL MODE
In this mode, channels 1 and 2 operate as two separate mono amplifiers. In this mode the minimum speaker impedance is 4Ω. (Note that in this mode the volume controls for channels 3 and 4 operate identically to the volume controls for channels 1 and 2.)
5.CROSSOVER MODE SWITCH (QX-4960 ONLY)
This switch selects the operational mode of the built-in crossover circuitry.
-BYPASS: Select this setting when using the amp in bridged mono mode. The crossover is not used.
-X-Over: Select this mode when running in bi-amped mode. Amp channels 1 and 3 are used for high frequencies, channels 2 and 4 are used for low frequencies. Crossover frequency range is 60Hz ~ 250Hz.
-X-Over x 10: In this mode the crossover frequencies from 60Hz to 250Hz or from 600Hz to 2.5kHz are
chosen by the Crossover Frequency Adjustment switch (6).
IMPORTANT: To prevent speaker damage, switch off the power before changing Crossover Mode.
6 QD -4240/4480/4960, QX-4960
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