ETI Sound Systems, INC US-4000, US-1800, US-1200 Stereo Mode, Parallel Mode, Bridged Mono Mode

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US SERIES AMPLIFIERS

THE BEAUTY OF POWER

MODE SELECT:

Stereo Mode

In STEREO mode, both channels operate independently, with their respective input gain controls. Signal at the Channel 1 input produces output at Channel 1, while the signal at Channel 2 input produces output at Channel 2. The minimum load impedance for STEREO operation is 2 Ohms per channel.

Parallel Mode

When set to PARALLEL mode, a signal applied to Channel 1’s input will be amplified and appear at both of the Channel 1 and 2 outputs. The level control knobs will oper- ate on their respective channels. Channel 2’s input is inactive in the PARALLEL mode. The PARALLEL mode is well-suited for applications when you need to feed two speakers with the same signal but each speaker is powered by its own amplifier channel. Mini- mum load impedance for PARALLEL operation is 2 Ohms per channel.

Bridged Mono Mode

Bridged mono mode combines both amplifier channels to make a powerful single-chan- nel amplifier. One channel ”pushes” and the other channel “pulls” the signal equally, doubling the voltage. When the voltage is doubled, the power is quadrupled if the same impedance load is used.

In a BRIDGE mode, the signal must be applied to Channel 1’s input only and

Channel 1’s gain control is used to adjust the signal level. The gain control of Channel 2 is not used and input 2 is inactive in BRIDGE mode.

NOTE: Minimum load impedance in BRIDGE mode is 4 Ohms. Connecting a lower impedance load to the amplifier in the BRIDGE mode may trigger the protection circuitry. In some instances it may cause severe damage to the amplifier, which is not covered by the warranty.

WARNING: Make sure the impedance of the speakers connected in a bridge mode are not lower than specified!!!

WARNING: Do not connect two 4 ohms subwoofers in parallel in bridge mode, as the total impedance halves in such a parallel connection. The total impedance will be 2 ohms, and will cause constant overheating and distortion of amplifier. It will also cause constant triggering of the AC circuit breaker and could damage your amplifier.

NOTE: In the BRIDGE mode a speaker is connected to both of the channels’ outputs and is not connected to the ground of the amplifier on both ends.

DO NOT ATTEMPT TO GROUND YOUR SPEAKER!

16 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 Signal Indicators Clip IndicatorsFront Panel Controls Blue illuminated stripsProtect Indicators AC Power SwitchInput connectors Link connectorsHPF High Pass Filter switch Rear Panel ControlsLimiter switch US-3000 and US-4000 models only Binding Post outputsSpeakon output connectors Rear Panel ControlsCircuit breaker ProtectionAC input Clip Limiters US-Series amplifiers have built Setting UP Your US-SERIES Amplifier Parallel Mode Stereo ModeBridged Mono 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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