BIAMP 2500 Stereo Power Amplifier Instruction Manual

BIAMP 2500 Stereo Power Amplifier

FEATURES

FEATURES OF THE 2500

STABILITY (under all conditions)

• Shorted outputs
• All reactive loads
• Open circuit
• Incorrect loads
• Higher power, high-frequency conditions

SONIC SUPERIORITY

• Lowest distortion available in a professional power amplifier
• Careful selection of critical components
• Extremely fast circuitry providing greater inner detail on complex musical passages
• Quality power supply enabling full power below 15 Hz.

Introduction

• The Biamp 2500 power amplifier was designed to operate safely and continuously into a variety of load requirements.
• The 2500 provides 450 watts per channel (both channels driven) into a 4 ohm load over a band- width of 20Hz to 20 KHz with no more than .05% THD, and 250 watts (both channels driven) into an 8 ohm load over a bandwidth of 20Hz to 20KHz with no more than .03% THD.
• The frequency response of the 2500 varies no more than + 0.5d from 8Hz to 30KHz from 1 watt to a rated output of 8 ohms.
• Features of the 2500 include a two-speed fan and partially exposed massive, high-efficiency heat sinks, XLR balanced inputs, unbalanced magnets and stacking outputs, 41 detent inputs level controls, artless relay D.C. output protection, thermal protection, easily accessible mono-stereo switch, front panel clipping indicators and thermal shut- down LED, delayed turn on and noiseless turn-off.

Operating Instructions

Section II Brief Operating Instructions

FRONT PANEL CONTROLS

• A.C. POWER SWITCH
  • This rocker switch causes the green LED directly above the switch to glow when the A.C. power is ON.
  • In the event the amplifier overheats and the thermal protection switch shuts down the amplifier, this GREEN LED will change to RED indicating the A.C. has been switched off.
  • The amplifier will turn back on when cooled down to safe limits. The fan will continue to operate to assist in rapid cool down.
• LEVEL CONTROLS
  • These 41 detent rotary input level controls determine the input sensitivity of the amplifier. When the control is fully on (clockwise) 1.4 volts will drive the amplifier to its rated output.
• CLIPPING LED INDICATORS
  • The Red LED clipping indicators are located directly above the respective channel level controls. When the clip indicator just flashes there is only .3 d8 of headroom remaining before the voltage swing hits the rails (clips).
  • When the Red LED clip indicator glows, the amplifier is at the point of clipping input levels should be turned down until the LEDs no longer glow brightly. Safe operating output is achieved when the Red LED clipping indicators just flash on the loudest peaks.
  • If the Ltu flashes continuously, turn down the input level control.
  • This LED will provide accurate metering of the output regardless of variances in load on the output of the amplifier because the circuit monitors the difference between the output level of the amplifier and the power supply voltage.

REAR PANEL FEATURES

COOLING FAN

• The 43″ cooling fan draws air into the rear of the chassis across the power supply, forces air over the top of the heat sink.
• The air is then deflected downward over the cooling fins of the heat sink by the top cover plate. Make sure the fan blades are unobstructed and free to turn.
• If the amplifier is operated in an atmosphere of dust and smoke, periodic cleaning of the fan blades and heat sinks will be required.
• When cleaning the heat sinks, disconnect the A.C. line plug from the wall and remove the top cover plate. Continuous use in a dirty or dusty environment may require the installation of a filter for the 44″ square fan.
• These filters are available at local electronic distributors. If a filter is used, be sure the filter is cleaned or changed at regular intervals to ensure continuous air flow.
• Factory and field tests have shown the heat sink assembly of the 2500 has tremendous cooling capacity.
• One-third power at 4 ohms (worst heat condition) temperature rise is only 60°C.
• Higher heat conditions as a result of lower impedances or dead shorts will cause higher heating.
• At 2.6 ohms the amplifier will produce 663 watts with a temperature rise of 75°C. (single channel driven).
• Into a dead short the amplifier is completely stable and will simply thermal off until the short ot input signal is removed.
• Factory tests have shown the amplifier will operate into a dead short for 48 hours without damage.

FAN SPEED SWITCH

• This recessed slide switch sets the speed of the fan. In the up position, the fan operates at high speed.
• In the down position, the fan operates at a slow speed. Heavy demand conditions may require high-speed fan operations.
• However, most cooling requirements can be met with the fan in the low-speed position.
• Dust build-up on the fan blades and heat sink reduces the amplifier’s ability to cool. Keep your 2500 clean.

ACTIVE BALANCED LINE INPUT CONNECTOR

• This 3-pin XLR type audio connector provides a transformerless active balanced line input that optimizes noise, slew rate, and transient response yet provides more than adequate common mode and RFI rejection.
• The input impedance is 24k ohms.
• This impedance permits the paralleling of numerous amplifiers without the need for line drivers.

STACKING OUTPUT

• This ¼” standard phone jack is not an input.
• The purpose of this jack is to permit paralleling the inputs of more than one power- amplifier from a single input source without resorting to “y” cords.
• The stacking output jack can be used when an input signal is applied to either the XLR balanced input or the unbalanced ¿” phone input jack.

UNBALANCED INPUT

• This %” standard phone jack is used for unbalanced Line Level input signals.
• When using the balanced XLR input, the output impedance of the stacking output jack is 1000 ohms. Up to 20 amplifiers can be driven when the balanced input is on the initial amplifier.

STEREO/MONO SWITCH

• This slide switch determines if the amplifier operates in the normal stereo mode or mono bridging configuration.

MONO BRIDGE OPERATION

• Step 1

  •   * With the amplifier A.C. Power switch turned off and both input levels turned down, place the stereo/mono slide switch in the MONO position.

• Step 2
  • Connect the input signal to the channel A balanced or unbalanced input jack.
  • Use only the RED (+) speaker binding posts. Channel A RED (+) binding post is the positive (+) terminal of the amplifier and should be connected to the +(red) terminal of the speaker. The
• Step 3
  • RED binding post of channel B is the negative (-) or black speaker terminal.
• Step 4
  • Turn on the A.C. rocker switch.
• Step 5
  • Use the channel A input level control to set the proper level.
  • The channel B input level control will be out of the circuit and it’s setting irrelevant.

WARNING

• Because the 2500 will produce tremendous power in the mono bridge mode (up to 1 kilowatt), great care should be taken to ensure that adequate speaker power handling capability ratings are observed.
• The 2500 is de-signed to operate into an 8-ohm speaker load in the mono bridge.
• Lower impedances will result in higher operating temperatures and volt-amp limiting.

A.C. LINE CORD

• For 120v operation. If you tour abroad, internal changes will be required but are easily achieved.

FUSE

• The fuse type is 15 amp 3AG.

RECOMMENDED FUSE RATINGS

Line Voltage

• 100v 20 AMP 3 AG
• 120v 15 AMP 3 AG.
• 200v 10 AMP
• 220v 10 AMP
• 240v 10 AMP

GENERAL SPECIFICATIONS

LIMITED WARRANTY

• BIAMP SYSTEMS, INC. warrants to the original consumer purchaser of each BIAMP product that the unit is free from defects in materials and workmanship.
• This express warranty commences on the date of purchase from an authorized BIAMP dealer and extends for one year.
• Completion and return of the warranty registration card enclosed with each unit within ten days of the date of purchase is a condition day of precedent to coverage and performance under this express warranty.

EXCLUSIONS AND LIMITATIONS:

• This warranty will be VOIDED if the serial number has been removed or defaced, or if the unit has been subjected to abuse, alterations, or attempted repair by any not authorized by the warrantor to make repairs, or installation contrary to the warrantor’s instructions. Cosmetic feet, and blemishes, such as handles, feet, and knobs are not warranted.
• All implied warranties, including the warranty of MERCHANTABILITY, are limited to the duration of this express warranty, and, if the registration card is not promptly returned, the implied warranties are limited to the duration of the express warranty if it had been effective.
• BIAMP SYSTEMS, for incidental or consequential damages, except for injury to the person.

HOW TO OBTAIN REMEDY:

• Carefully pack your BIAMP product and return it to one of the BIAMP Authorized Service Centers or write the BIAMP Customer Service Department at the address below for giving your name and address.
• You are responsible for freight and insurance charges to the Authorized Service Center or the factory.
• WHAT BIAMP WILL DO: BIAMP will repair or, at its option, this warranty the factory will be returned to the owner freight collection.
• Units brought to Authorized Service Centers will be held for pickup by the owner for a period established by the individual Authorized Service Center, or, at the owner’s option, returned to the owner freight collect.
• This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
• For instance, some states do not allow limitations on how long an implied warranty lasts, or the exclusion or limitation of incidental or consequential damages, so the above limitations or exclusions may not apply to you.
  • BIAMP CUSTOMER SERVICE DEPARTMENT
  • Biamp Systems, Inc.
  • 11000 S.W. 11th
  • Beaverton, OR 97005

POWER MODULE REPLACEMENT

• Step one: Remove the top Cover.
• Step two: heat scents, from the bottom plate used to secure
• Step three: Remove handle bolts with a 5/32″ Allen wrench. (2)
• Step four: Remove the rear bolts to free the module. (2)
• Step five: Pivot module outward as shown. Remove all connections and remove the module.
• Step six: (if necessary) To remove the P.C. board from the heat sink simply remove (6) bolts from the plastic insulators plus (1) screw securing the bias transistor to the heat sink. (Accessible through the large hole in the P.C. board.) Then pull directly upward to separate output devices from the circuit.

Note: All replacement modules will have the mono stereo switch attached to the P.C. board. When replacing channel “A” desolder remove this switch before mounting.

• 10074 SW Arctic Drive
• Beaverton, OR 97005
• 503-641-7287

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