ETI Sound Systems, INC US-1200, US-4000, US-1800 Clip Limiters US-Series amplifiers have built

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US SERIES AMPLIFIERS

THE BEAUTY OF POWER

to the amplifier. Do not block the air vents on the front and do not block the fans on the rear panel. Make sure the open cell foam air filters behind the vents on the front of the amplifier are clean. If necessary, use a vacuum cleaner to clean these air filters.

NOTE: If the air filter become too dirty, the amplifier may not operate normally as air circulating inside the amplifier may become too hot, thereby triggering the thermal protection. If you cannot properly clean the air filters externally with a vacuum, remove the air filters from the amplifier and clean them thoroughly. This procedure SHOULD be performed BY A QUALIFIED PERSONNEL ONLY! Disconnect your amplifier completely from its power source –

YOU MUST PHYSICALLY DISCONNECT THE POWER CORD AND NOT JUST TURN OFF THE POWER SWITCH! Remove the amplifier’s top cover and locate the plastic brackets, which house the air filters. Push the two levers at the top of these plastic brackets to access the foam filters. Remove the foam air filters, clean them thoroughly and then place them back into the amplifier. Secure the filter by snapping the plastic brackets back into place.

Transformer Thermal Protection: If the power transformer gets too hot, the thermal switch in- side the transformer will trigger and will disconnect all of the secondary power. When this occurs, there will be no output signals coming from the amplifier and all LEDs, including the PROTECT LED, will be OFF. Once the transformer cools down, power to the ampli- fier will automatically restore. In normal conditions, the transformer will not overheat. Thermal protection of the transformer indicates abnormal use, such as excessive operation at a very low impedance at high signal levels. In this case, check and reconfigure your loudspeakers connection. Reducing the output level can also help.

NOTE: If the transformer overheats and

the thermal switch disconnects the power from the amplifier, it will take some time for the trans former to cool down before power is restored. It takes much longer for the transformer to cool down compared to overheated heatsinks.

Short circuit: If the output is shorted because of

faulty wiring, the thermal circuitry will automatically protect the amplifier and mute the output signals. If this occurs, the load will disconnect. Check and cor- rect the short wire condition.

DC Voltage Protection: If an amplifier chan- nel detects a DC voltage at the loudspeaker output, the protection circuitry will trigger and the amplifier will go into protection mode. In normal conditions there should not be a significant DC signal on the am- plifier outputs. DC on the outputs indicates a serious problem with the amplifier. In this instance, the ampli- fier must be referred to qualified service personnel. Subsonic Frequency Protection: Built-in high-pass subsonic filters provide subsonic frequency protection for each channel. This protection prevents subsonic audio signals, which may sometimes be present in the music program, from reaching your loudspeakers. Limiting the subsonic frequencies in the output signal improves the sound reproduction by reducing the excursion of the transducer’s cone at low frequencies and prevents excessive heating inside of the amplifier.

NOTE: US-Series amplifiers also employ switchable high-pass filters (HPF), which limit the low frequency range to 50Hz when activated. Turn these HPFs ON when connecting full range speakers to the amplifier. This will improve the bass performance of most full range speakers by limiting uncontrolled and excessive cone motion due to the lowest of frequencies. Using HPFs with full range speakers provides more power to the speaker’s rated range allowing higher SPLs. You may want to turn OFF the HPFs when using the US-Series amplifiers with quality subwoofers.

Current Limiting Protection: The output stage of the amplifier is protected by current-limiting circuitry. This circuitry is inactive under normal condi- tions. It activates only when it senses a dangerously high current through the output transistors, for exam- ple when a connected load has an impedance that is too low, or when the output of the amplifier is shorted. Current limiting protection engages only when it is needed and is not indicated on the front panel. If there is a constant over-current condition it will acti- vate the thermal protection. In this case, the PROTECT LED on the front panel will illuminate.

CLIP LIMITERS: US-Series amplifiers have built-

14 B-52 US Series Professional Power Amplifiers - Instruction Manual

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Contents US-1200 US-1800 US-3000 US-4000 Contents Unpacking and Installation Welcome to the B-52 FamilyImportant Information WHAT’S the Meaning of THIS?Important Safety Precautions Power Ratings AT a Glance US-1200 US-1800 US-3000Amplifier Features Front Panel Controls Signal IndicatorsClip Indicators Blue illuminated stripsProtect Indicators AC Power SwitchHPF High Pass Filter switch Input connectorsLink connectors Rear Panel ControlsLimiter switch US-3000 and US-4000 models only Binding Post outputsSpeakon output connectors Rear Panel ControlsAC input ProtectionCircuit breaker Clip Limiters US-Series amplifiers have built Setting UP Your US-SERIES Amplifier Bridged Mono Mode Stereo ModeParallel Mode Connecting Your Speakers SPK- to PIN Wiring Specifications US-1200 US-1800 US-3000 US-4000Limited Warranty Incidental or Consequential DamagesBeauty of Power Beauty of Power Professional

US-3000, US-4000, US-1800, US-1200 specifications

ETI Sound Systems, INC offers a range of powerful audio solutions designed to meet various sound reinforcement needs. Among their prominent offerings are the US-1200, US-1800, US-3000, and US-4000 models. Each model showcases a blend of advanced technologies and robust characteristics aimed at delivering high-quality sound.

The US-1200 is an entry-level model that makes waves in the audio landscape with its compact design and impressive performance. It features a lightweight cabinet, making it easy to transport and set up for events. The system delivers 1200 watts of peak power, ensuring clear and powerful sound reproduction. It includes a built-in amplifier, meaning users can connect their sound sources directly without needing additional equipment. The US-1200's integrated protection circuitry prevents damage from overloads, ensuring longevity and reliability.

Moving up the line, the US-1800 offers enhanced capabilities, boasting an output of 1800 watts. This model incorporates advanced digital signal processing, allowing for tailored sound adjustments to suit various environments. It features Bluetooth connectivity for wireless audio streaming, providing users the flexibility to play music from devices without the complications of cables. The US-1800 is ideal for mobile DJs and small venues looking for a powerful yet portable solution.

The US-3000 brings even greater power and sophistication to the table with 3000 watts of peak performance. It features advanced crossover technologies, optimizing the sound output across different frequency ranges. This model is designed for larger events, ensuring that every corner of the venue can experience high-quality audio. With multiple input options, including XLR and RCA, the US-3000 can accommodate various audio sources, making it a versatile choice for professional setups.

Lastly, the US-4000 stands as the flagship model in the ETI lineup. It boasts an astonishing 4000 watts of peak power and features cutting-edge audio processing technology. This powerhouse is equipped with a sophisticated feedback elimination system, ensuring clarity even at high volumes. The US-4000 is designed for large-scale events and professional installations, providing unparalleled reliability and sound quality. Its rugged construction is built to withstand the rigors of touring and extensive use.

In summary, ETI Sound Systems, INC has curated a diverse lineup with the US-1200, US-1800, US-3000, and US-4000, catering to different audio needs while incorporating advanced technologies that ensure exceptional sound quality and performance.
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