THE BEAUTY OF POWER

US SERIES AMPLIFIERS

NOTE: Match the pin designations printed next to the output connectors on rear panel to ensure proper connections.

9.Circuit breaker

The circuit breaker protects the amplifier from faults at the AC supply and serves as protection when the amplifier fails.

If the circuit breaker trips, cutting AC power supply to your amplifier, it may indicate a serious malfunction or failure. Wait for the circuit breaker to cool before resetting it by simply pressing the reset knob. If the circuit breaker repeatedly trips, especially when there is no signal on the inputs or outputs, this indicates a failure of your amplifier. DISCONNECT the power cord from the amplifier immediately and contact an authorized B-52 Service Center.

There are rare instances when the circuit breaker acts on a constant heavy overload with a very low imped- ance load connected to amplifier, protecting your amplifier against such improper usage. In such cases you need to check and correct your load (loudspeak- ers) to provide for the proper load impedance, and/or reduce output signal.

10. AC input

IEC connector for the AC power cable. Connect the supplied heavy-gauge 3-pin IEC power cable.

NOTE: Never disconnect the EARTH pin from the AC connection. It will defeat safety measures used in your power amplifier and void the warranty.

PROTECTION

US-Series amplifiers feature comprehensive protection circuitry that protects both the loudspeakers and the electronics from malfunctioning. The protection is non- intrusive, sonically transparent and does not affect the sound unless there are extreme conditions that acti- vate the protection circuitry.

The PROTECT LEDs on the front panel illuminate when the protection is active during the power-up sequence, when thermal protection is activated, or when there is a malfunction. When the PROTECT LEDs are ON, the amplifier’s outputs are muted.

Initial power-up:The protection circuitry will activate for about two to three seconds from the time you turn ON the amplifier. The speaker outputs are muted during this period. If the amplifier is operating normally, the protection circuitry will deactivate and the amplifier will switch to operation mode.

NOTE: It is normal for the PROTECT LED to fade gradually after the amplifier is turned OFF.

Thermal Protection: Excessive heat-sink tem- peratures will engage the thermal protection circuitry to avoid damage to your amplifier. The speaker output will mute and the PROTECT LED will illuminate. Thermal protection only engages on the channel

which has the overheating heatsink, except the US- 1200 where both channels will be muted. The thermal protection will automatically restore to normal opera- tion mode automatically once the heatsink tempera- ture drops to a safe level.

NOTE: If the thermal protection constantly activates, check the impedance of your loud- speakers and the condition of the air filters on front of the amplifier. The loudspeakers impedance must not be lower than what is specified in this manual for 2-channel and BRIDGE operation. 8 Ohms and 4 Ohms speaker loads per channel (8 Ohms and 16 Ohms in BRIDGE mode) should not trigger the thermal protection circuitry if the air access is not blocked and the air filters are clean. 2 Ohms speaker loads per channel (4 Ohms in BRIDGE mode) can cause the thermal protection circuitry to activate occasionally. If this occurs, decrease the signal level and consider reconthe speakers connections to reduce the load on the amplifier (for example, do not connect too many speakers in parallel to the same channel).

NOTE: Make sure there is adequate air access

B-52 US Series Professional Power Amplifiers - Instruction Manual 13

Page 12 Page 14
Page 13
Image 13
ETI Sound Systems, INC US-1800, US-4000, US-1200, US-3000 owner manual Protection, Circuit breaker, AC input
Page 12 Page 14

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.
Top Page Image Contents