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THE BEAUTY OF POWER US SERIES AMPLIFIERS
US-SERIES
PROFESSIONAL POWER AMPLIFIERS
US-1200
US-1800
US-3000
US-4000
OWNERS MANUAL
B-52 US Series Professional Power Amplifiers - Instruction Manual
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US SERIES AMPLIFIERS THE BEAUTY OF POWER CONTENTS Introduction ................................................... 3 Warnings and Safety Instructions ..................... 4-5 Features ........................................................ 5 Power Ratings at a Glance .............................. 6 US-Series Features .......................................... 7 Front Panel Controls ....................................... 8-9 Rear Panel Controls ........................................ 10-13 P
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THE BEAUTY OF POWER US SERIES AMPLIFIERS WELCOME TO THE B-52 FAMILY Thank you for purchasing a US-Series Professional Power Amplifier. At B-52, we believe in over- building all of our products and the US-Series Professional Power Amplifiers are no exception. We took our time in de- signing these stellar looking amps to outperform the competition on any stage, in the clubs and on the road. To achieve studio quality audio reproduction we utilized low noise, low distortion circuitry and high curre
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US SERIES AMPLIFIERS THE BEAUTY OF POWER IMPORTANT INFORMATION Please keep this instruction manual for future reference and for the duration of owning your US-Series Professional Power Amplifier(s). Please carefully read and comprehend the instructions inside this manual before attempting to operate the amplifier. This instruction manual includes essential safety information regarding the use and maintenance of the US-Series Amplifier. Take special care to heed all warning symbols and signs
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THE BEAUTY OF POWER US SERIES AMPLIFIERS IMPORTANT SAFETY PRECATIONS u 1. REAd INSTRuCTIONS – All the safety and amplifier should be unplugged from the outlet when proper ventilation as per the manufacturer’s instruc- operating instructions should be read before this left unused for a long period of time. tions have been adhered to. product is operated. 14. OBECT j ANd LIquId ENTRY – Care should 18. gROuNdINg – Always maintain reliable 2. RETAIN INSTRuCTIONS – The safety and be taken so that
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US SERIES AMPLIFIERS THE BEAUTY OF POWER POWER RATINgS AT A gLANCE u S-1200 u S-1800 u S-3000 u S-4000 Rated Output Power STEREO BOTH CHANNEl D RIvEN 8 Ohms 210 watts 300 watts 500 watts 700 watts 4 Ohms 330 watts 475 watts 800 watts 1100 watts 2 Ohms 430 watts 700 watts 1200 watts 1600 watts Rated Output Power BRIDgED MONO 8 Ohms 650 watts 950 watts 1600 watts 2200 watts 4 Ohms 850 watts 1400 watts 2400 watts 32
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THE BEAUTY OF POWER US SERIES AMPLIFIERS AMPLIFIER FEATuRES The US-Series features four professional heavy-duty power amplifiers, covering a wide range of output power ratings. The models are US-1200, US-1800, US-3000 and US-4000. US-Series amplifiers are built on a rugged, heavy gauge steel chassis with a sturdy aluminum front panel. The amplifiers use advanced circuitry and a well-designed PCB layout to ensure quality sound and enhanced reliability. Large aluminum heatsinks and an oversize
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US SERIES AMPLIFIERS THE BEAUTY OF POWER FRONT PANEL CONTROLS Opposite page 1 3 3 2 2 1 1. RACk MOUNTINg POINTS signal is amplified with maximum gain. When the LEVEL is set fully clockwise, the amplifier produces Points to bolt your amplifier into a rack. 2. AIR VeNTS its rated output power at a 4 Ohm load with +4dBu US-Series amplifiers are cooled by two rear-mounted (1.23V r ms) signal applied to the inputs. All detents are marked in dBs showing the attenuation of fans (US-1200 has one f
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THE BEAUTY OF POWER US SERIES AMPLIFIERS 7 6 8 10 7 6 9 4 4 11 5 5 Reduce the output volume using the specific channel’s the amplifier’s outputs, this indicates a fault. level controls until the clipping disappears or until the Immediately tur n the amplifier OFF , disconnect CLIP LEDs flash only occasionally . the power cord from the AC outlet, and refer the 7. PROTeCT INdICATORS amplifier to ser vice personnel. Authorized B-52 These yellow LEDs indicate that the channel i
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US SERIES AMPLIFIERS THE BEAUTY OF POWER 6 4 5 4 5 1 3 2 2 3 REAR PANEL CONTROLS 1. FAN(S) information about balanced and unbalanced connections in the CONNECTIONS section later Cooling fans with variable speed controls. Air enters the amplifier through vents located on the front alu- in this manual. minium panel. Do not block the front vents or the fans NOTe: For BRIDGED MONO or P ARALLEL MONO use the Channel 1 input jack only . on the rear panel of the amplifier. 2. INPUT CONNeCTO
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THE BEAUTY OF POWER US SERIES AMPLIFIERS 9 8 1 10 7 5. lIMITeR switch (US-3000 and mono signal cable to a remote power amplifier(s), and then connecting speakers to both of the channels US-4000 models only) When the sound source signal is too high, the out- in order to reproduce the same signal. In P ARALLEL put signal will distort. To prevent this, both channels mode the input of channel 2 is inactive and should not be used in this configuration. feature clip limiters to prevent gross dis
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US SERIES AMPLIFIERS THE BEAUTY OF POWER REAR PANEL CONTROLS (cont.) 9 8 6 5 4 4 5 1 1 10 3 2 2 7 3 binding posts offer a variety of connection options. in BRIDGED mode is 4 Ohms. NEVER Use speaker wires with stripped ends (do not strip CONNECT 2 Ohms rated loudspeaker(s) or them more than ½” or 12.5mm), using the holes on a combination of speakers to the amplifier in the the bottom of the binding posts. Ensure that no par t of BRIDGED mode. the speaker wire is exposed when connect
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THE BEAUTY OF POWER US SERIES AMPLIFIERS NOTe: Match the pin designations printed next There are rare instances when the circuit breaker acts on a constant heavy overload with a very low imped- to the output connectors on rear panel to ensure proper connections. ance load connected to amplifier, protecting your 9. CIRCUIT BReAkeR amplifier against such improper usage. In such cases you need to check and correct your load (loudspeak- The circuit breaker protects the amplifier from faults
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US SERIES AMPLIFIERS THE BEAUTY OF POWER to the amplifier. Do not block the air vents on faulty wiring, the thermal circuitry will automatically the front and do not block the fans on the rear protect the amplifier and mute the output signals. If panel. Make sure the open cell foam air filters this occurs, the load will disconnect. Check and cor- behind the vents on the front of the amplifier are rect the short wire condition. clean. If necessary, use a vacuum cleaner to dC VOl TAge
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THE BEAUTY OF POWER US SERIES AMPLIFIERS in limiter circuitry for improved performance when problem by compressing the signal at clipping. US- overloading. The limiter activates at “clipping” when Series amplifiers use intelligent clipping circuitry to the output voltage reaches the power supply voltage protect both the loudspeakers and amplifier. rails. Without limiters, the output voltage will grossly NOTe: US-1200 and US-1800 amplifiers have distort if the signal elevates beyond this poi
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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 P ARALLEL mode, a signal applied to Channel 1’ s input will be amplified and appear at both of the Channel
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THE BEAUTY OF POWER US SERIES AMPLIFIERS CONNECTINg YOR SPEA u kERS Stereo Mode _ _ + + 5-Way Output Binding Posts B A or or B A Parallel Mode _ _ + + 5-Way Output Binding Posts B A or A Bridged Mono _ + 5-Way Output Binding Posts A or Bridged / Mono A B-52 US Series Professional Power Amplifiers - Instruction Manual 17
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US SERIES AMPLIFIERS THE BEAUTY OF POWER Stereo Mode _ _ _ _ + + + + or or B A B A B A SPK+ to PIN 2+ SPK+ to PIN 1+ SPK+ to PIN 1+ SPK+ to PIN 1+ SPK- to PIN 2- SPK- to PIN 1- SPK- to PIN 1- SPK- to PIN 1- Parallel Mode _ _ + + _ _ or B A + + A SPK+ to PIN 1+ SPK+ to PIN 1+ SPK- to PIN 1- SPK- to PIN 1- B A SPK+ to PIN 2+ SPK+ to PIN 1+ SPK- to PIN 2- SPK- to PIN 1- Bridged Mono _ + SPK+ to PIN 1+ or A SPK- to PIN 2+ A Bridged / Mono B-52 US Series Professional Power Amplifiers - Instruction M
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THE BEAUTY OF POWER US SERIES AMPLIFIERS WIRINg There are multiple ways to connect a US-Series ampli- fier to other audio equipment. The US-Series features balanced inputs and link outputs, which allows you to connect both balanced and unbalanced signals. For speaker connections, you can use either binding posts or Speakon™ connectors. NOTe: Use speaker wires with the lowest gauge available. The thicker the speaker wires are, the less output signal you will lose. TM SPeAkON OUTPUT CON
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US SERIES AMPLIFIERS THE BEAUTY OF POWER SPECIFICATIONS u S-1200 u S-1800 u S-3000 u S-4000 Rated Output Power STEREO BOTH CHANNElS D RIvEN @ 1KHz, 1%THD 8 Ohms 210 watts 300 watts 500 watts 700 watts 4 Ohms 330 watts 475 watts 800 watts 1100 watts 2 Ohms 430 watts 700 watts 1200 watts 1600 watts Rated Output Power BRIDgED MONO @ 1KHz, 1%THD 8 Ohms 650 watts 950 watts 1600 watts 2200 watts 4 Ohms 850 watts 1400 watts 2400 watts 3200 watts Inp
