ETI Sound Systems, INC US-3000, US-4000, US-1800, US-1200 Setting UP Your US-SERIES Amplifier

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THE BEAUTY OF POWER

US SERIES AMPLIFIERS

in limiter circuitry for improved performance when overloading. The limiter activates at “clipping” when the output voltage reaches the power supply voltage rails. Without limiters, the output voltage will grossly distort if the signal elevates beyond this point. The signal wave form is flattened (“clipped”), producing excessive high frequency distortion not present in the original signal. This makes music sound “dirty” and increases stress on the high frequency transducers, significantly shortening their life span (most loud- speaker manufacturers will not honor warranties if high frequency drivers are “burnt” due to a clipped signal overload). Clip limiters effectively solve this

problem by compressing the signal at clipping. US- Series amplifiers use intelligent clipping circuitry to protect both the loudspeakers and amplifier.

NOTE: US-1200 and US-1800 amplifiers have a built-in limiter circuitry which is constantly activated. The US-3000 and US-4000 amplifiers have an external switch located on the rear panel, which activates and deactivates the clip limiters. B-52 recommends the clip limiter switch on both the US-3000 and US-4000 remain ON. You may choose to turn OFF the limiters when using the US-3000 and US-4000 to power subwoofers.

SETTING UP YOUR US-SERIES AMPLIFIER

CLIP LIMITER: Clipping is the result of an amplifier running into a power supply limitation. The maximum output voltage that any amplifier can produce is limited by its power supply. Attempting to output a voltage level that exceeds the power supply voltage rails results in a flattening effect of the signal causing it to clip. A clipped waveform exhibits severe distor- tions, making it sound harsh. The clip limiter detects this condition and reduces the gain to minimize the amount of overdrive. To preserve as much of the program dynamics as possi- ble, the limiter reduces the average program level until the peaks barely clip. Each channel has its own clip limiter and you can switch it ON or OFF (only on US-3000 and US-4000). The clip limiter allows brief clipping which is not detectable to the ear. It activates when a clip condition repeats, to avoid prolonged distortion. When driving full-range speakers, clip limiting reduces the high frequency distortion caused by low frequency overload. It also protects higher frequency drivers from excess overdrive and harsh clipping harmonics.

NOTE: You may want to keep the limiters OFF when connecting the US-3000 and US-4000 to power subwoofers.

HPF (High-Pass Filter): High Pass Filters (HPF) are also known as low-cut filters. HPFs on the US-Series amplifiers cut off signals below 50Hz. As a result, bass reproduction is optimized, since ultra-low frequencies, which most speakers cannot reproduce anyway, are eliminated and more power becomes available for the reproduction of the remainder of the music signal.

NOTE: You should set the filters to best suit the frequency response of your speakers as some speakers are particularly sensitive to over-excursion. The 50Hz filters on the US-Series amplifiers work well with most full-range speakers.

NOTE: For most subwoofers and in studio applications keep the HPF in the OFF position.

B-52 US Series Professional Power Amplifiers - Instruction Manual 15

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Contents US-1200 US-1800 US-3000 US-4000 Contents Welcome to the B-52 Family Unpacking and InstallationWHAT’S the Meaning of THIS? Important InformationImportant Safety Precautions US-1200 US-1800 US-3000 Power Ratings AT a GlanceAmplifier Features Blue illuminated strips Signal IndicatorsClip Indicators Front Panel ControlsAC Power Switch Protect IndicatorsRear Panel Controls Input connectorsLink connectors HPF High Pass Filter switchBinding Post outputs Limiter switch US-3000 and US-4000 models onlyRear Panel Controls Speakon output connectorsProtection Circuit breakerAC input Clip Limiters US-Series amplifiers have built Setting UP Your US-SERIES Amplifier Stereo Mode Parallel ModeBridged Mono Mode Connecting Your Speakers SPK- to PIN Wiring US-1200 US-1800 US-3000 US-4000 SpecificationsIncidental or Consequential Damages Limited WarrantyBeauty 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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