Ampro XA1000 User manual

XA1000 & XA1400
INSTALLATION AND OPERATION MANUAL

1. Save the carton and packing material even if the equipment has
arrived in good condition. Should you ever need to ship the unit, use
only the original factory packing.
2. Read all documentation before operating your equipment. Retain
all documentation for future reference.
3. Follow all instructions printed on unit chassis for proper operation.
4. Do not spill water or other liquids into or on the unit, or operate
the unit while standing in liquid.
5. Make sure power outlets conform to the power requirements listed
on the back of the unit.
6. Do not use the unit if the electrical power cord is frayed or broken.
The power supply cords should be routed so that they are not likely
to be walked on or pinched by items placed upon or against them,
paying particular attention to cords and plugs, convenience
receptacles, and the point where they exit from the appliance.
7. Always operate the unit with the AC ground wire connected to the
electrical system ground. Precautions should be taken so that the
means of grounding of a piece of equipment is not defeated.
8. Mains voltage must be correct and the same as that printed on the
rear of the unit. Damage caused by connection to improper AC voltage
is not covered by any warranty.
9. Have gain controls on amplifiers turned down during power-up
to prevent speaker damage if there are high signal levels at the inputs.
10 Power down and disconnect units from mains voltage before making
connections.
11. Never hold a power switch in the “ON” position if it won’t stay
there itself!
12. Do not use the unit near stoves, heat registers, radiators, or other heat
producing devices.
13. Do not block fan intake or exhaust ports. Do not operate equipment
on a surface or in an environment which may impede the normal flow
of air around the unit, such as a bed, rug, weathersheet, carpet,
or completely enclosed rack. If the unit is used in an extremely dusty
or smoky environment, the unit should be periodically “blown free”
of foreign matter.
14. Do not remove the cover. Removing the cover will expose you
to potentially dangerous voltages. There are no user serviceable
parts inside.
15. Do not drive the inputs with a signal level greater than that required
to drive equipment to full output.
16. Do not connect the inputs / outputs of amplifiers or consoles to any
other voltage source, such as a battery, mains source, or power supply,
regardless of whether the amplifier or console is turned on or off.
17. Do not run the output of any amplifier channel back into another
channel’s input. Do not parallel- or series-connect an amplifier output
with any other amplifier output. Australian Monitor Inc is not
responsible for damage to loudspeakers for any reason.
18. Do not ground any red (“hot”) terminal. Never connect a “hot” (red)
output to ground or to another “hot” (red) output!
19. Non-use periods. The power cord of equipment should be unplugged
from the outlet when left unused for a long period of time.
20. Service Information Equipment should be serviced by qualified service
personnel when:
A. The power supply cord or the plug has been damaged.
B. Objects have fallen, or liquid has been spilled into the equipment
C. The equipment has been exposed to rain
D. The equipment does not appear to operate normally, or exhibits a
marked change in performance
E. The equipment has been dropped, or the enclosure damaged.
THIS SAFETY INFORMATION IS OF A GENERAL NATURE AND MAY BE SUPERSEDED BY INSTRUCTIONS CONTAINED WITHIN THIS MANUAL
IMPORTANT SAFETY INFORMATION

PAGE 3XA1000 & XA1400 INSTALLATION AND OPERATION MANUAL
Congratulations on choosing Australian Monitor for your professional
amplification requirements.
The design of our XA Series Audio Power Amplifiers embraces all the aspects of
a well designed amplifier. The visual design, mechanical,
electrical and sonic parameters, along with our dedicated manufacturing
process, have all been optimized to provide a professional tool that exhibits
quality, reliability and longevity.
The XA Series amplifiers are 2 unit (3.5”) high, 19” wide, rack
mountable units.
Each channel of the amplifier comprises a balanced active input with a
buffered attenuator driving a drive stage which in turn drives a fan-cooled
output stage. The amplifier operates from a high current-capable switch-mode
power supply.
These amplifiers have been specifically designed to deliver their high power
output with minimal distortion, and provide the critical degree of control required
by your speakers.
AUS, EUR, USA
Copyright 1st August 2008
Rev A: 01/08/08
This symbol is intended to alert the user to the presence of uninsulated
“dangerous voltage” within the products enclosure that may be of sufficient
magnitude to constitute a risk of electric shock to persons.
This symbol is intended to alert the user to the presence of important
operational and maintenance (servicing) instructions in the literature
accompanying the appliance.
To prevent electric shock do not use this (polarised) plug with an extension
cord, receptacle or other outlet unless the blades can be fully inserted to
prevent blade exposure. To prevent electric shock, match wide blade of
plug to wide slot, fully insert.
Caution:
CAUTION
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER (OR BACK),
NO USER SERVICEABLE PARTS INSIDE,
REFER SERVICING TO QUALIFIED SERVICE PERSONAL.
WARNING!
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK
DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.
RISK OF ELECTRIC SHOCK
DO NOT OPEN
INTRODUCTION AND CONTENTS
INTRODUCTION 3
FEATURES 4
PROTECTION FEATURES 5
CONTROLS, CONNECTORS & INDICATORS 6–7
INSTALLATION 7–8
OPERATION 9
MAINTENANCE 10
SPECIFICATIONS 11

PAGE 4 XA1000 & XA1400 INSTALLATION AND OPERATION MANUAL
FEATURES
> Custom designed, 2RU heavy duty steel chassis
> Front carry handles
> Symmetrical layout – even-weight distribution
> Class G operation
> High efficiency switch mode power supply
> Efficient front to back cooling
> Variable speed axial fans
> Balanced inputs and buffered attenuators
> Input signal strapping (loop through) connectors
> Suppression of inrush current at mains turn-on
> Input muting at turn-on
> Input overvoltage protection
> Radio-frequency interference suppression
> Short-circuit protection and indication
> High overload mains breaker
> Thermal sensing
> Signal ground lift switch
> Built in limiter circuit
> Stereo, bridged or parallel operation
> Binding post and 4 pole speaker output connection
> VU meter
> Output clip indication
> Multi-role output fault indication
> High-quality, close-tolerance components throughout
> Lightweight
PROTECTION FEATURES

PAGE 5XA1000 & XA1400 INSTALLATION AND OPERATION MANUAL
CONTROLS, CONNECTORS & INDICATORS
37
Front Panel
The XA Series differ only slightly across all models and all share the same
features on their front panels.
Figure 1 shows the panel layout of an XA amplifier.
The functions of the controls and indicators are as follows:
1Power Switch
Press the switch to up for power on and down for power off. At start-up
(turn-on), the input to the amplifier is muted for approximately two seconds.
2 Australian Monitor Installation Series Logo/On Indicator
The Australian Monitor Installations Series logo will illuminate and indicates that
the amplifier is on and receiving mains power.
3 Fault Indicator
This red LED indicates a problem with the amplifier or that it has over heated. In
the advent of a thermal overload, the internal operating temperature of one or
both amplifier channels has exceeded a safe level of operation and the channels
will be automatically muted. The fans will continue to run and once the effected
channel/s have cooled, they will unmute and return to normal operation.
4 Attenuator
Level control for your amplifier is provided by a potentiometer on the front panel
and indicates gain. There are two controls on all XA models. Each control is
labelled for the channel which it operates.
5 VU Meter
This is a blue LED lamp which displays the level of the output stage signal.
The attack and decay time (ballistics), of the status circuit are those of a Peak
Programme Meter (P.P.M.)
6 Clip
This red LED will illuminate when clip occurs.
Clipping can occur under extreme operating conditions such as:
> complex or very low loads
> over driving the amplifier
It should be noted that the minimum load for the amplifier is 2 ohms per
channel (4 ohm bridged).
Note: The amplifier is not damaged by running into clipping, but
speakers may be. To maximise the life of your speakers, try to keep
clipping infrequent.
The clip detection circuit works by using the feedback circuit where the input
is continually compared to the output. When the input differs from the output
either due to rail clipping or current limiting the clip circuit is triggered.
This point also controls the voltage limiter so the voltage will limit at precisely
the clip point no matter what the load is or where the mains voltage level is.
7 Bridge Indicator
This amber LED will illuminate when the input switch is set to bridge.
8Fan Grill
This is where air is drawn into the amplifier for cooling.
Note: You should always ensure that the fan grille is kept clean and
free from the build up of dust and lint. This will ensure longer operation
of your amplifier and reduce the possibility of it prematurely going into
thermal shutdown mode. See the section “Installation – Cooling”
on page 14 for recommended cooling procedures.
1 2
6
5
8
4

PAGE 6 XA1000 & XA1400 INSTALLATION AND OPERATION MANUAL
CONTROLS, CONNECTORS & INDICATORS
Rear Panel
9Balanced Input
A female 3-pin combined XLR/TRS type connector is provided on each input:
Pin 1/Sleeve = Signal Ground;
Pin 2/Tip = Hot (non-inverting or in phase);
Pin 3/Ring = Cold (inverting or reverse phase).
9a Signal Strapping
A male 3-pin XLR type connector is provided and wired in parallel with the
female input XLR for strapping / looping signal between amplifiers.
10 Signal Ground Lift Switch
When this switch is engaged it disconnects signal ground from the input
connectors on both channels. It is intended to be used when “hum” is caused by
earth loops (due to different ground potentials between source equipment and
the amplifier) or stray magnetic field pick up on the input ground/shield wiring.
(It does not interrupt signal ground continuity on the strapping connector). The
amplifier should be turned off before engaging this switch!
11 Binding Post Outputs
Touch proof binding posts (banana jacks) are provided for speaker output
termination with banana plugs or bare wire. The red post is used as positive
and the black post is used as negative. For bridge connection, use only the red
posts.
11a Speaker Output Connector
A 4 pole speaker connector is provided as an additional speaker output. This
standard of loudspeaker-to-amplifier connection allows access to both channels
of the amplifier via the one connector for bi-amp applications. Channel-A is
considered the dominant channel and has both channels wired to the speaker
connector. See the installation section of this manual for detailed information on
speaker connector wiring.
9
10 11
11a
14 9a 15 12
13
12 Mains Connection
Your amplifier is fitted with an internationally recognised IEC mains inlet
connector.
Please ensure that the connecting mains lead for use with the IEC connector is
of an approved type and is of sufficient current carrying ability.
Note: Your unit must always be earthed!
13 Circuit Breaker
The amplifier is fitted with a resettable circuit breaker.
If the circuit breaker trips, allow 3 mins for the contacts to reset thermally
before pushing the reset button to reset it mechanically.
14 Stereo/Bridge/Parallel Mono Switch
When set to STEREO, your amplifier operates as two independant channels.
When set to PARALLEL, your amplifier will only accept signal applied to Channel
A’s input XLR. Channel B’s output signal will come from A’s input but both
channels will have independant attenuator control.
When set to BRIDGE mode of operation your amplifier will only accept
signal applied to channel A’s input XLRs and the level of both channels
will be controlled by the channel A attenuator. The output from channel B
will automatically be of the opposite polarity (reversed phase) and speaker
termination should be sourced from the red binding-post outputs. Alternatively,
the speaker could be connected to poles 1+ & 2+ of the 4 pole speaker
connector (see Installation – Output Wiring on page 11).
15 Gain Setting
This switch adjusts the sensitivity of your amplifier. When set to 0dB a 0dBu
signal applied to the input with the attenuator at max will deliver maximum
power to the output.

PAGE 7XA1000 & XA1400 INSTALLATION AND OPERATION MANUAL
INSTALLATION
Power Requirements
Power consumption for your model of the XA Series amplifier is indicated on the
rear panel for maximum output.
Ensure that your mains voltage is the same as the rear panel mains voltage
marker (+/- 10%).
Mounting
Your amplifier is designed for standard 19” rack mounting and occupies 2 EIA
rack units (3.5”). The mounting centres are:
Vertical: 3.0” (76.2mm)
Horizontal: 18.2” (461.2mm) to 18.7” (473.8mm).
The slots in the mounting flange will accept bolt diameters up to 1/4” (6.35mm).
We recommend that you provide additional support for the amplifier, especially
if road use is planned, as the weight could bend some rack frames. This support
can be provided by secure shelving on support rails.
Cooling
Your XA Series amplifier is cooled by an axial fan which draws cool air from
the front of the amplifier and expels the heated air out the rear of the amplifier.
These amplifiers offer variable speed fans which run at half speed up to to full
speed when the internal heatsink temperature exceeds 60° C (128° F).
An unrestricted airflow into and out from the amplifier must be provided. Any
restriction of the air flow will cause heat to build up within the unit and possibly
force the unit into its thermal shutdown mode.
If the amplifiers are to be operated in an environment where the airflow is
restricted such as sealed racks, the cooling should be supplemented by extra
cooling fans to evacuate the heated air and aid the flow of cool air through
the unit.
Input Wiring
IMPORTANT: Do not directly connect pin 1 on the amplifier’s input or
strapping XLR, to the amplifier’s chassis, speaker ground or power
ground!
WARNING: Input signal ground is not to be used as a safety
ground (earth).
The input to your amplifier is a balanced 3-pin configuration and requires all
three pins to be connected. Only high quality twin-core shielded cable should
be used.
When wiring for a balanced source, the connector going to the input of your
amplifier should be wired as follows:
Pin 1/Sleeve = GROUND / SHIELD.
Pin 2/Tip = HOT (In Phase - non inverting).
Pin 3/Ring = COLD (Reverse Phase - inverting).
When wiring from an unbalanced source you must ensure that pin 3 is
connected to pin 1 (input ground), either by linking the pins in the input
connector or by the source equipment’s output wiring.
When wiring for an unbalanced source:
Pin 1/Sleeve = GROUND/SHIELD
Pin 2/Tip = HOT (in phase with the amplifier’s output),
Pin 3/Ring = GROUND/SHIELD (joins to pin 1).
Note: In-line XLR connectors often have a termination lug that connects
directly to the chassis of the connector.
IMPORTANT: Do not link this lug to pin 1 at the amplifier’s input as it
will defeat the amplifier’s input grounding scheme.
Output Wiring
When wiring to your speakers always use the largest gauge wire your connector
will accept. The longer the speaker lead, the greater the losses will be, resulting
in reduced power and less damping at the load. We recommend using a heavy
duty, two core flex (four core flex if bi-amping) 10 to 12 gauge (2mm2 to
2.5mm2 or 50/0.25 or equivalent) as a minimum.
Binding Post Outputs
When terminating to the 4 mm binding post (banana jack) output connectors,
banana plugs or bare wires can be used. The red terminal is positive and the
black terminal is negative (ground).
If running in BRIDGE mode, only the red binding posts are used.
When bridging, Channel A provides the positive output to the load and channel
B provides the negative output to the load.
Speaker Outputs
When using the 4 pole speaker connector for speaker output, use only the
mating 4 pole in-line connector. This connector is designed so that both
channels can be fed from a single connector.
Two speaker connectors are provided on the amplifier.
The ”Channel A” speaker connector actually carries both channel A and channel
B outputs (see Speaker Connector Wiring Diagrams).
The ”Channel B” speaker connector carries the Channel B output only.
This arrangement allows you the option of connecting to the outputs separately
or together. Connecting through a single connector has the advantage of
minimising connections, preserving phasing and simplifying channel allocation,
which is particularly important when bi-amping or in bridge mode.
IMPORTANT: Do not overload your amplifier by connecting the
channel B output twice!
Channel A is used as the “dominant” channel and when sourcing a dual output
from Channel A, the following standard should normally be used (depending on
speaker system wiring):
Channel A = Left or Low Frequencies.
Channel B = Right or High Frequencies.
When in bridge mode:
Pin 1+ = Bridge Output Positive
Pin 2+ = Bridge Output Negative

PAGE 8 XA1000 & XA1400 INSTALLATION AND OPERATION MANUAL
INSTALLATION
Hum Problems
Most equipment is designed for minimum hum when used under ideal
conditions. When connected to other equipment, and to a safety earth in an
electrically noisy environment, problems may occur.
The three ”E”s of hum and hum related noise which can plague your audio
system are:
a) Electrostatic radiation,
b) Electromagnetic radiation, and
c) Earth loops
Electrostatic radiation capacitively couples to system elements, causing an
interference voltage that mainly affects higher impedance paths, such as
amplifier inputs. The source is generally a nearby high voltage, such as a mains
lead or a speaker lead. The problem can usually be reduced by moving the
offending lead away, or by providing additional electrostatic shielding (i.e. an
earthed conductor which forms a barrier to the field).
Electromagnetic radiation induces interference currents into system elements
that mainly effect lower impedance paths. Radio transmitters or stray magnetic
fields from mains transformers are often the cause of this problem. It is
generally more difficult to eliminate this kind of interference, but again, moving
the source away or providing a magnetic shield (i.e. a steel shield) should help.
Earth loops can arise from the interfacing of the various pieces of equipment
and their connections to various safety earths.
This is by far the most common cause of hum, and it occurs when source
equipment and the amplifier are plugged into different points along the safety
earth where the safety earth wiring has a current flowing through it. The current
flowing through the wire produces a voltage drop due to the wire’s resistance.
This voltage difference between the amp earth and source equipment earth
appears to the amplifier’s input as a signal and is amplified as hum.
There are three things you can do to avoid earth loop problems:
Ensure the mains power for the audio system is “quiet” i.e. without equipment
on it such as air-conditioning, refrigeration or lighting which may generate noise
in the earth circuit.
Ensure all equipment within the system shares a common ground/ safety
earth point. This will reduce the possibility of circulating earth currents, as the
equipment will be referenced to the same ground potential.
Ensure that balanced signal leads connecting to the amplifier are connected to
earth at one end only.
Signal Ground-Lift Switch
When proper system hook-up has been made, you may still have some hum
or hum related noise. This may be due to any of the previously mentioned
gremlins.
Your XA Series amplifier has a “Signal Ground Lift” switch which disconnects
the input ground wiring from the amplifier. A substantial drop in hum and/or
hum related noise can result from the judicious use of this switch.
Note: If the input ground lift switch is used, you must ensure adequate
shielding of the input wiring. If the signal source equipment does not
provide adequate shielding (i.e. a definitive connection to ground), you
must disconnect the shield from the input connector’s ground pin (Pin-1)
and re-connect it to the ”drain” contact on the input connector. This will
ensure the shield on your input wiring actually goes to the amplifier
chassis and subsequently to earth.
IMPORTANT: Do not connect pin-1 directly to the drain connection.
You will defeat the amplifiers internal grounding scheme and possibly
cause instability to the amplifier.
Always ensure that your amplifier is off and the attenuators are down when
you engage this switch. This switch should only be used when the amplifier is
operated from a balanced signal source.
Note: Be wary of quasi-balanced outputs, these are often no more
than floating unbalanced outputs.
Speaker Connector Wiring Diagram

PAGE 9XA1000 & XA1400 INSTALLATION AND OPERATION MANUAL
OPERATION
IMPORTANT: All signal source equipment should be adequately earthed.
This not only ensures your safety but everybody else’s as well. Faults
can and do occur in mains connected equipment where the chassis
can become “live” if it is not properly earthed. In these instances,
the fault in a “floating” (ungrounded) piece of equipment will look for the
shortest path to ground, which could possibly be your amplifier’s input.
If the fault current is large enough, it will destroy the input to your
amplifier and look for the next available path, which may be you!
Before making any connections to your XA Series amplifier, observe the
following:
Ensure the mains voltage supply matches the label on the rear panel of your
amplifier (+/- 10%).
Ensure that the power switch is OFF.
Ensure that all system grounds (earth) are connected from a common point.
Avoid powering equipment within a system from multiple power sources that
may be separated by large distances.
Check the continuity of all interconnecting leads to your amplifier; ensure that
there are no open or short circuited conductors.
Ensure that the power handling of your load (speakers) can adequately cope
with the power output of the amplifier.
Before operating your XA Series amplifier, ensure that:
> The attenuators are at the “OFF” position (fully anticlockwise).
> The GROUND LIFT Switch is not engaged (should be in the “out” position).
> The BRIDGE Switch is not engaged if you are not running the amp in
bridged mode.
Powering Up
REMEMBER: The amplifier should be the last piece of equipment that
you turn on and the first piece of equipment that you turn off.
We recommend turning the attenuators on your amplifier down when turning
the unit on.
When you power up your XA Series, your amplifier goes through an initialising
period before it will accept signal. The Inrush Current Suppression (ICS) circuit
is in operation for the first 0.2 seconds. This limits the mains current, to prevent
”nuisance-tripping” of circuit breakers.
During this period you will hear a couple of relays “click”, indicating mains is
now directly applied to the amplifier and the signal path is connected.
While the ICS circuit operates there is also a 30dB mute on the signal input.
After two seconds this mute will release, allowing any applied signal to pass
un-attenuated.
When switching the amplifier off, wait a couple of seconds before switching the
amplifier on again. This allows the ICS circuit to reset.
Level Matching
The normal operating position for the attenuator is the max position (fully
clockwise, no attenuation). In this position the amplifier operates at full gain.
Turning the attenuator back (anticlockwise) reduces the input sensitivity.
Note: If full power output is required, you should operate your amplifier
with the front panel attenuator above the half way (12o’clock) position,
otherwise clipping of the input circuitry and its resultant distortion will
occur before full output power is achieved.
Sensitivity
Your amplifier is a linear device operating with a fixed input to output voltage
gain (less attenuation). The maximum output voltage swing is determined by the
applied mains voltage, load, load type and the duty cycle of the applied signal.
The input sensitivity for your XA Series amplifier when the attenuator is at
maximum position (fully clockwise) is nominally:
0dBu (0.775 volts in) for rated power into a 4 ohm load.
Each channel of your XA Series amplifier has a nominal balanced input
impedance of 20kOhms (@1kHz) and should not present a difficult load for any
signal source.
Your signal source (i.e. the equipment feeding signal to the amplifier) should
have an output impedance of 600 Ohms or lower to avoid unwanted high
frequency loss in the cabling.
Input overload occurs at +20.5dBu(8.25volts).

PAGE 10 XA1000 & XA1400 INSTALLATION AND OPERATION MANUAL
MAINTENANCE
Only competent or qualified persons should attempt any service or maintenance
of your amplifier. Your XA Series amplifier will need minimal maintenance.
No internal adjustments need to be made to the unit to maintain optimum
performance. To provide years of unhindered operation we suggest a
maintenance inspection be carried out on a regular basis, say every 12 months
or so.
Fans
Due to the openness of the air path through your XA Series amplifier, very little
dust should settle within the amplifier. The unit has been designed so that any
dust and/or foreign particles that do settle within the amplifier will not unduly
hinder the cooling of the amplifier.
The grille in front of the fans will act to limit the amount of dust and lint
entering the amplifier. You will find in time that there will be a build up of dust
and lint on the grille which may start to hinder the airflow through the amplifier.
You should periodically remove the dust and keep the grille clean. Removal of
dust from the rear grille will also aid cooling.
Over time, dust may build up on the leading edge of the fan blades and reduce
their cooling efficiency. The time taken for this to happen will depend on the
environment and the amount of use.
The fan blades are accessible once the lids are removed and can be easily
cleaned. You need only hold the fan rotor still and wipe the dust off the blades.
Many users stall the fan and use compressed air to blow the dust off the fan
blades. It is important to note that the fan blades must be held still whilst
blowing air over the blades otherwise you may burn out the bearings in the fan.
SPEAKER
CONNECTOR
(BRIDGE)

PAGE 11XA1000 & XA1400 INSTALLATION AND OPERATION MANUAL
SPECIFICATIONS
Output Power 1% THD @ 1kHz 2ohm single channel 2ohm both channels
driven 4ohm 8ohm
Stereo 550W 500W 300W x 2 200W x 2
Bridged 1000W 600W
XA1000
Distortion (re 4ohm, 1dB below clip) THD (@ 1kHz) 0.1%
Input Impedance 20kohms
Input Sensitivity -6/0/+6dBu
Signal/Noise Ratio 100dB
Damping factor (@ 1kH re 8 ohms) 300:1
Frequency Response (+/0.5dB) 20Hz–20kHz
Thermal Dissipation Both channels, 2ohm 1/8th power 370W (1163btu/hr)
Current Draw Both channels driven, 2ohm load, 230Vac 1/8th power 2.7A
Dimensions (H x W x D) 88mm x 482mm x 400mm
Weight 9.0 Kg
Shipping Dimensions (H x W x D) 190mm x 600mm x 560mm
Shipping Weight 11.5kg
Output Power 1% THD @ 1kHz 2ohm single channel 2ohm both channels
driven 4ohm 8ohm
Stereo 800W 700W 500W x 2 350W x 2
Bridged 1400W 1000W
XA1400
Distortion (re 4ohm, 1dB below clip) THD (@ 1kHz) 0.1%
Input Impedance 20kohms
Input Sensitivity -6/0/+6dBu
Signal/Noise Ratio 100dB
Damping factor (@ 1kH re 8 ohms) 300:1
Frequency Response (+/0.5dB) 20Hz–20kHz
Thermal Dissipation Both channels, 2ohm 1/8th power 565W (1928btu/hr)
Current Draw Both channels driven, 2ohm load, 230Vac 1/8th power 3.8A
Dimensions (H x W x D) 88mm x 482mm x 400mm
Weight 9.5 Kg
Shipping Dimensions (H x W x D) 190mm x 600mm x 560mm
Shipping Weight 12kg

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