Bl MP“
2500
Operation Manual
BIAMP
S Y S FE MOSES
10074 SW Arctic Drive Beaverton, OR 97005 503-641-7287
FEATURES OF THE 2500
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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.
(1)
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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) inte 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 + 0.5dB from 8Hz to 30KHz from 1 watt to rated output into
8 ohms. ETE E. В
Features of the 2500 include a two-speed fan and partially exposed
massive, high efficiency heat sinks, XLR balanced inputs, unbalanced
inputs and stacking outputs, 41 detent inputs level controls, arcless
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. a
(2)
Section II Brief Operating Instructions
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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 (clock-
wise) 1.4 volts will drive the amplifier to its rated output.
CU CLIPPING LED INDICATORS TS
The Red LED clipping indicators are located directly above respective
channel level controls. When the clip indicator just flashes there is
only .3 dB 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 LED's no longer glow brightly. Safe operating output is acheived
when the Red LED clipping indicators just flash on the loudest peaks.
If the LED 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.
(3)
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MODEL 2500 ue he ВЕ
STEREO AMPURER | | Merc ]
250 WATTS FER CHANNEL SIT -
| NSOWANTS PER CHANEL «it. CHANNEL A
CAUTION FOR CONTINUED UNBALANCED
PROTECTION AGAINST FIRE
HAZARD MEPLACE OMY ATH
SAME TYPE 18 AMS 2507 FUSE STACKED
OUTPUT
FOR HONS SFUDGINS OPERATICH (+) нон CALITION: 10 PrEVENT
PLACE SVATON IN MONO: BAIDOS 15 A ELECTRICAL SHOCK DO MOT
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CHANNEL À CONNECT LOAD LOW SEAVICEABALE PARTS H4300€
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SERVICE MAN MIST DISCOMMCT
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120 VAC COVER PANEL
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REAR PANEL FEATURES
COOLING FAN
The 4%" 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 4%" 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 insure 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 impedences or dead shorts will cause higher
heating. At 2.6 ohms the amplifier will produce 663 watts with a
temperature rise of 759C. (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 set the speed of the fan. In the up po-
sition the fan operates at high speed. In the down position the fan
operates at 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 reduce the amplifiers ability to cool. Keep
your 2500 clean.
(4)
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 providing more than adequate common mode
and RFI rejection.
Input impedance is 24k ohms. This impedance permits the
paralleling of numerous amplifiers without the need for line
drivers.
STACKING OUTPUT
This %" standard phone jack is not an input. The purpose of this
Jack 1s 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
X" phone input jack.
UNBALANCED INPUT
This %" standard phone jack is used for unbalanced Line Level
input signals.
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(5)
When using the balanced. XLR input, the output impedence of the stacking
output jack is 1000 ohms. Up to 20 amplifiers can be driven when the balance
input is on the initial amplifier.
STEREO/MONO SWITCH
This
mode
MONO
slide switch determines if the amplifier operates in the normal stereo
or mono bridging configuration.
BRIDGE OPERATION
А.С.
Step 1 With the amplifier A.C. Power switch turned off and both input
levels turned down, place the stereo/mono slide switch to the
MONO position. |
Step 2 Connect the input signal to the channel A balanced or unbalanced
input jack.
Step 3 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
RED binding post of the 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 its setting irrevelant.
*#*WARNING***
Because the 2500 will produce tremendous power in the mono bridge mode
(up to 1 kilowatt), great care should be taken to insure that adequate
speaker power handling capability ratings are observed. The 2500 is de-
signed to operate into an 8 ohm speaker load in mono bridge. Lower im-
pedances will result in higher operating temperatures and volt-amp
limiting. |
LINE CORD
FUSE
The power supply is designed for either U.S.A. or export operations.
100v, 120v, 200v, or 240v, 50 or 60 Hz. All U.S.A. shipments are wired
for 120v operation. If you tour abroad, internal changes will be
required but are easily acheived.
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
(6)
Section III 2500 GENERAL SPECIFICATIONS
Rated Power Output: 250 Watts 8 ohms both channels operating
450 Watts 4 ohms both channels operating
860 Watts 8 ohms mono bridge
Frequency Response: + 0.1dB 20KHz at 1 watt into 8 ohms (stereo)
+ 0.5dB 8Hz to 30KHz at 250 watts into 8 ohms
(stereo)
Harmonic Distortion: Less than .008% from 20Hz to 1KHz and increasing
linearly to .03% at 20KHz at 250 watts into 8
ohms, both channels operating.
Less than .01% from 20Hz to 1KHz and increasing
linearly to .05% at 20KHz at 450 watts into 4
ohms, both channels operating.
Less than .09% from 20Hz to 1KHz and increasing
linearly to .15% at 20KHz, 900 watts into 8
ohms (mono).
IM Distortion: Less than .008% from 0.25 watts to 250 watts int
8 ohms per channel.
Less than .05% from 0.25 watts to 450 watts inte
4 ohms per channel.
Less than .15% from 0.25 watts to 860 watts intc
8 ohms (mono).
Slewing Rate: | Greater than 60 volts per microsecond.
Damping Factor: Greater than 350.
Input Sensitivity: 1.4 volts for full output.
Qutput Impedance: Less than 2.75 milliohms in series with less
than 2 microhenries. (stereo)
Less than 5.25 ,illiohms in series with less
than 4 microhenries. (mono)
Load Impedance: Rated for 16, 8 and 4 ohm usage, safe with all
loads. (stereo)
Rated for 16 and 8 ohm usage, safe with all loac
(mono) .
Input Signal : Unbalanced, dual channel. (stereo) % phone jack
Balanced dual channel. (stereo) XLR type
Balanced single channel. Channel À controls are
active: Channel B inactive but not removed from
operation. (mono)
(7)
Voltage Gain:
General Protection:
D.C. Output Offset:
Hum and Noise:
Input Impedance:
Output Impedance:
High Voltage Power Supply:
Low Voltage Power Supply:
Power Requirements:
Turn On:
D.C. Output Protection:
Controls:
Displays:
Connectors:
30 dB + 1.2dB at maximum gain. (stereo)
36 dB + 1.2dB at maximum gain. (mono)
Protection circuitry limits the output level to
protect the output transistors. Output stage ove
heating causes a shutdown of the A.C. power
to the transformer while the fan continues to
operate to cool the amplifier.
Arcless relay protection prevents D.C. being
passed to the speakers in the event of power amp
malfunction D.C. is blocked at the input by
electroytic capacitors.
Delayed turn on and noiseless turn off prevents
spurious noises caused by discharging capa-
citors and transients.
(Shorted input) + 10 millivolts.
105 dB below rated output (20Hz-20KHz)
(XLR balanced) 24K ohms.
(phone jack unbalanced) 24K ohms.
(Phone jack unbalanced stacking output) 1000 ohm
One 2100 VA transformer with computer grade capa
citors totalling 42000 microfarads.
+ 15v DC
50-60Hz AC with adjustable taps for 100, 120, 20
220, and 240v, + 10% operation. Draws 100 watts
or less at idle, 1200 watts at 250 watts per
“channel into 8 ohms.
Two second delay after applying power. No dan-
gerous transients. |
Arcless relay circuiting instantanuously re-
moves the speaker load from the amplifier at
1 volt D.C. at 7Hz (full power).
On/Off rocker switch. Channel A and Channel 8
level controls. FAN SPEED AND STEREO/MONO
slide switches are located on the rear panel.
A green LED over the On/Off switch indicates
the A.C. mains are on. This LED turns Red when
the amplifier overheats and shuts down the A.C.
to the transformer. The Red LED's located above
each input level control indicate amplifier
clipping conditions for that respective channel.
Balanced Input - 3 - pin XLR type
Unbalanced Input - standard %" phone jack
Unbalanced Stacking Output - standard %" phoneje
(8)
Connectors (cont.)
Modular Design:
Construction:
Heat Sink and Cooling:
Dimensions:
Weight:
Finish:
Output - color coded dual binding posts on
standard %" centers; spaced %" apart for
mono (balanced) output connection.
Independent power amplifier heat sink modules
with locking "quick disconnect" connectors
to facilitate quick servicing and removal.
‘Chassis - 14 guage cold-rolled steel, transforme:
brackets of 14 guage cold-rolled steel are weldet
to main chassis at front panel. Power supply
filter capacitors vertically mounted for longer
life and bolted to the main chassis. P.C. boards
glass based epoxy double-sided with plated throu
holes.
High efficiency forced air cooling utilizing
massive heat sink extrusion with 30 fins on each
extrusion. A two speed fan mounted on the rear
panel forces air across the power transformer
fins and down the sides of the amplifier. Becaust
the heat sinks are exposed on the sides the unit
will operate at full power into 8 ohms without
a fan with an ambient temperature of 25°C.
19" (48.36cm) rack mounting x 7" (17.78cm) high
x 11" (27.94cm) depth behind panel mounting sur-
face. Handles protrude 2" (5.08cm) in front of
panel mounting surface.
52 pounds (23.66Kg) net weight
Satin black anodized front panel, handles and he:
sinks. Black textured duracron paint on chassis
and top cover plate. Silk screen nomenclature in
cluding block diagram on the cover plate.
(9)
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
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, attempted repair by any
person not authorized by warrantor to make repairs, accident, or
installation contrary to.the warrantor's instructions. Cosmetic
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. In no event will BIAMP SYSTEMS, INC. be responsible
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
instructions on how to return your unit to the factory. Pack a
letter with the unit explaining the nature of the problem and
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,
replace each unit covered by this warranty. Units sent to the
factory will be returned to the owner freight collect. Units
brought to Authorized Service Centers will be held for pickup
by the owner for a period of time 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
(10)
Step one:
Step two:
Step three:
Step four:
Step five:
Step six:
(if necessary)
POWER MODULE REPLACEMENT
OC
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Remove top Cover.
Remove screws from the bottom plate used to secure
heat sink. (3)
Remove handle bolts with a 5/32" allen wrench. (2)
Remove rear bolts to free the module. (2)
Pivot module outward as shown. Remove all con-
nections and remove the module.
To remove P.C. board from heat sink simply remove
(6) bolts from plastic insulators plus (1) зстем
securing bias transistor to thé heat sink. (Acces-
sible 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 and remove this switch prior to mounting.
(11)
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