MANUAL
Champ - 4
Professional quad power amplifier
INFO@APART-AUDIO.COM
Safety First!
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aution: hot and sharp surfaces ! This professional device needs to be installed by
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qualified personnel only.
Please check the carton box for any kind of damage on reception of the goods. In case of a
damaged carton, please contact your dealer before opening the carton.
!!!! Danger !!!! Exposure to extremely high noise levels may cause a permanent hearing
loss. Individuals vary considerably to noise induced hearing loss but nearly everyone will lose
some hearing if exposed to sufficiently intense noise for a sufficient amount of time. Therefore
it is recommended that all persons exposed to equipment capable of producing high sound
pressure levels, such as this amplifier, be protected by hearing protection while installing or
operating this unit.
Read all documentation before operating your equipment.
Keep all documentation for future reference.
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.
Do not spill water or other liquids into or on the unit.
Make sure power outlets conform to the power requirements listed on the back of the unit.
Do not use the unit if the electrical power cord is frayed or broken.
Always operate the unit with the AC ground wire connected to the electrical system ground.
Have gain controls on amplifiers turned down during power-up to prevent speaker damage if
there are high signal levels at the inputs.
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.
Power down & disconnect units from mains voltage before making connections.
Do not use the unit near stoves, heat registers, radiators, or other heat producing devices.
Do not operate equipment on a surface or in an environment which may distort the normal flow
of air around the unit. If the unit is used in an extremely dusty or smoky environment, the unit
should be periodically “blown free” of dust.
Do not remove the cover. Removing the cover will expose you to potentially dangerous voltages.
Do not drive the inputs with a signal level higher than that required to drive equipment to full
output.
Do not run the output of any amplifier back into another input.
Do not ground the red output terminal, never connect a red output terminal to another red
output terminal.
In case of mal-function this device should be serviced by qualified service personnel only.
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Manual contents
1.Features
2. Inputs and outputs
3. Rack mounting and wiring
4. standalone use
5. Technical specifications
1. Features
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ustom designed side mount heatsinks, four discrete class AB amplifiers in a one unit 19”
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enclosure.
Switchable high and low pass filters for easy and troublefree subwoofer/satellite applications.
Integrated APC limiter circuitry and clip indication. This intelligent circuit will prevent harsh
distortion caused by clipping, provided that the input signal itself is not distorted of course…
what goes in, comes out.
Bridgeable power amplifiers : double the output power by uniting the power of 2 amplifiers.
Minimum load impedance in bridge mode is 8 ohms.
Self-supporting low resonance frame. Torsion free front and side panel construction with
integrated heatsink assembly.
Solid aluminum brushed front panel with removable 19” brackets and handles for use in a
rack, no additional support needed. Without the 19” brackets it will be a standalone unit in
high quality audio systems.
High power toroidal transformer.
Low impedance power supply for improved dynamic response.
Solid speaker binding posts.
4 sets of banana screw plugs included.
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2. Inputs and outputs
Front panel layout:
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1
6
3
7
4
8
5
12 13 14 15
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10
11 16 17 18
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1) Volume potmeter channel 1: use this potmeter to preset the volume. In case the amplifier has been switched
to bridge mode, this potmeter sets the level for bridge operation.
2) Signal led channel 1: this led lights up green when a sufficiently strong signal is present on the first channel,
after passing the input level control. At startup, the led will light up red during a few seconds, this is perfectly
normal. When it lights up red during use, the power transformer or power amplifier is overheated or in protect
mode and is shut down. Turn off the power. The amplifier will not turn on automatically after most error
conditions. In some cases, the user MUST turn off power, remove the overload or let it cool down and
then power on again !
3) APC activity led channel 1: this led lights up when the APC circuitry is active. The APC circuitry reduces the
gain at the inputs to guarantee the full dynamic range of the power amplifier circuits, without allowing any
harsh distortion.
4) Clip led channel 1: this led lights up whenever the amplifier clips. This is a warning sign: you are pushing
things a little too far or you are overloading the amp. Reduce the input level by a few dB so that this led never
lights up anymore !
5) B
ridge led: this led lights up to indicate that the amplifier is in bridge mode.
6) S
ignal led channel 2: this led lights up green when a sufficiently strong signal is present on the left channel,
after passing the input level control. At startup, the led will light up red during a few seconds, this is perfectly
normal. When it lights up red during use, the power transformer or power amplifier is overheated or in protect
mode and is shut down. Turn off the power. The amplifier will not turn on automatically after most error
conditions. In some cases, the user MUST turn off power, remove the overload or let it cool down and
then power on again!
7) APC activity led channel 2: this led lights up when the APC circuitry is active. The APC circuitry reduces the
gain at the inputs to guarantee the full dynamic range of the power amplifier circuits.
8) C
lip led channel 2: this led lights up whenever the amplifier clips. This is a warning sign: you are pushing
things a little too far or you are overloading the amp. Reduce the input level by a few dB so that this led never
lights up anymore ! Don’t ignore this !
9) V
olume potmeter channel 2: use this potmeter to preset the volume. In bridge mode, this potmeter has no
function.
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10) P
ower switch and power led: flip the switch to power on the amplifier. The blue led will light up to indicate
that mains power is present.
11) Volume potmeter channel 3: use this potmeter to preset the volume. In case the amplifier has been switched
to bridge mode, this potmeter sets the level for bridge operation.
12) S
ignal led channel 3: this led lights up green when a sufficiently strong signal is present on the first channel,
after passing the input level control. At startup, the led will light up red during a few seconds, this is perfectly
normal. When it lights up red during use, the power transformer or power amplifier is overheated or in
protect mode and is shut down. Turn off the power. The amplifier will not turn on automatically after
most error conditions. In some cases, the user MUST turn off power and remove the overload and
then power on again !
13) APC activity led channel 3: this led lights up when the APC circuitry is active. The APC circuitry reduces the
gain at the inputs to guarantee the full dynamic range of the power amplifier circuits.
14) C
lip led channel 3: this led lights up whenever the amplifier clips. This is a warning sign: you are pushing
things a little too far or you are overloading the amp. Reduce the input level by a few dB so that this led
never lights up anymore ! Don’t ignore this !
15) B
ridge led: this led lights up to indicate that the amplifier is in bridge mode.
16) S
ignal led channel 4: this led lights up green when a sufficiently strong signal is present on the left channel,
after passing the input level control. At startup, the led will light up red during a few seconds, this is perfectly
normal. When it lights up red during use, the power transformer or power amplifier is overheated or in
protect mode and is shut down. Turn off the power. The amplifier will not turn on automatically after
most error conditions. In some cases, the user MUST turn off power and remove the overload and
then power on again !
17) APC activity led channel 4: this led lights up when the APC circuitry is active. The APC circuitry reduces the
gain at the inputs to guarantee the full dynamic range of the power amplifier circuits.
18) C
lip led channel 4: this led lights up whenever the amplifier clips. This is a warning sign: you are pushing
things a little too far or you are overloading the amp. Reduce the input level by a few dB so that this led
never lights up anymore ! Don’t ignore this !
19) V
olume potmeter channel 4: use this potmeter to preset the volume. In bridge mode, this potmeter has no
function.
Note : signal leds 2, 6 , 12 and 16 have multiple functions: during the first few seconds of startup they
light up red, this is perfectly normal. When a strong audio signal is present on the amplifier circuit,
the leds light up green. When an error occurs during operation, they will turn red to indicate an error
condition and the speaker relays will switch off automatically. Possible causes can be : amplifier error
or DC on the output, amplifier overheat or transformer* overheat. In such cases, remove the error
condition or overload and wait until the unit has cooled down before powering on again.
*In case the transformer is overheated, it may take a long time before the amplifier has cooled down sufficiently.
In such cases, you may have overloaded the amplifier too much. Power off the amplifier immediately, correct the
error and wait until the amplifier has cooled down.
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Rear panel layout:
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2
3
4
5
6
7
8
9
10
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12
13 14
1) C
hannel 4 unbalanced input on cinch connectors: use the top or bottom cinch connector to apply an
unbalanced signal on channel 4. These connectors are wired in parallel, this means you can use the second
connector as a signal link connector.
2) C
hannel 3 unbalanced input on cinch connectors: use the top or bottom cinch connector to apply an
unbalanced signal on channel 3. These connectors are wired in parallel, this means you can use the second
connector as a signal link connector. In case of bridge operation of channel 3 and 4, use this connector and
leave channel 4 input unused.
3) M
ode switch : enables to switch to normal 2 channel stereo operation, 2 channels mixed and each playing
this mono mix, or single channel bridge mode. In case of bridge mode, only the channel 3 volume control is
used. This is indicated by the bridge led on the front panel.
4) G
round lift switch: use this switch to lift or connect audio ground to safety ground. This can be usefull in case
of hum.
5) Top switch: when pushed in, an active highpass filter at 100 Hz, 12 dB/octave is applied to channels 3 and 4,
when not pushed in, channels 3 and 4 operate as full range channels.
6) C
hannel 4 speaker binding post: this connector accepts speaker cable as well as 4 mm banana plugs.
Remove the protective cover from the middle of the red/black binding post in case you want to use banana
plugs. For bridge mode applications, you MUST use the red binding posts only: channel 4 red plug is
bridge mode negative speaker connector.
7) C
hannel 3 speaker binding post: this connector accepts speaker cable as well as 4 mm banana plugs.
Remove the protective cover from the middle of the red/black binding post in case you want to use banana
plugs. For bridge mode applications, you MUST use the red binding posts only: channel 3 red plug is
bridge mode positive speaker connector.
8) M
ains cable connector: plug the mains cable connector here, this socket also contains a mains fuse holder.
Replace this fuse only with the type as indicated on the rear panel.
9) C
hannel 2 speaker binding post: this connector accepts speaker cable as well as 4 mm banana plugs.
Remove the protective cover from the middle of the red/black binding post in case you want to use banana
plugs. For bridge mode applications, you MUST use the red binding posts only: channel 2 red plug is
bridge mode negative speaker connector.
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10. Channel 1 speaker binding post: this connector accepts speaker cable as well as 4 mm banana plugs.
Remove the protective cover from the middle of the red/black binding post in case you want to use banana
plugs. For bridge mode applications, you MUST use the red binding posts only: channel 1 red plug is
bridge mode positive speaker connector.
11. With this switch, you can acivate/deactivate the integrated subwoofer filter circuitry. Standard crossover
frequency is lowpass at 100 Hz. The position marked ‘AP’ has been optimized for use with optionally available
APart-audio passive subwoofers.
12. Mode switch : enables to switch to normal 2 channel stereo operation, 2 channel mixed (mono) operation or
single channel bridge mode. In case of bridge mode, only the channel 1 volume control is used. This is indicated
by the bridge led on the front panel.
13. Channel 2 unbalanced input on cinch connectors: use the top or bottom cinch connector to apply an
unbalanced signal on channel 2. These connectors are wired in parallel, this means you can use the second
connector as a signal link connector.
14. Channel 1 unbalanced input on cinch connectors: use the top or bottom cinch connector to apply an
unbalanced signal on channel 1. These connectors are wired in parallel, this means you can use the second
connector as a signal link connector. In case of bridge operation of channel 1 and 2, use this connector and
leave channel 2 input unused.
What is bridge mode ?
In bridge mode, you can unite the power of 2 small amplifiers into 1 giant amp.
The resulting power usually is more than double the power of both amplifiers used
individually with the same load. There is a simple reason for this power boost:
because the speaker load is wired to the channel’s positive (hot) connectors, the
amplifiers ‘feel’ half of the actual speaker’s impedance. This means that, despite
the fact that you connect for example an 8 ohm speaker, the amp thinks there is a 4
ohm load, resulting in higher power output per amplifier, and since both amplifiers
work in bridge mode, this increased power is doubled. As a result, the minimum load
impedance in bridge mode is limited to 8 ohms, because every amplifier only ‘feels’
half of this impedance. Set the speaker impedance selector of channel 1 to the 4-8
ohms position for 8 ohms(or higher) loads in bridge mode.
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3. Rack mounting and wiring
hamp-4 can be mounted in a 19” rack, taking up only 1 rack space. Always allow a good airflow
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around the amplifier’s front, rear, side, top and bottom. When installing in a rack with multiple
audio devices, it is compulsory to leave one rack space between units. Fill the empty rack
spaces with meshed blind panels for improved ventilation. Never mount the amplifier in a sealed
cabinet, unless adequate forced ventilation is provided. The amplifier may not be able to meet the
specifications when installed in a poorly ventilated environment. Support the unit at the rear when
installing in a rack!
Always remember: excessive heat is one of your amplifier’s biggest enemies!
When wiring an audio rack, it is a good installation practice to route all AC wiring
along one side of the rack and all audio wiring along the other side to avoid coupling
mains cable interference into the audio path. Please use only high quality signal
and speaker cables and connectors. Pay special attention to avoiding ground loops
when installing audio devices in metal racks, use special insulating rack mounting
hardware, such as the so called ‘humfrees’. This mounting hardware will make sure
that several devices mounted in a rack will be electrically isolated from the rack, and
thus are a great help in avoiding ground loops. Any damage caused by user induced
ground loops are not covered by warranty! Ground loops can cause hum or other
strange side effects that will affect stable and safe operation of audio hardware and
peripheral devices. Ground loops are often created by connecting tuners to cable
distribution sockets. Always use a RF isolating transformer whenever there is a cable
signal tuner or digital TV tuner in the audio path!
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4. Stand alone use
It is possible to integrate Champ-4 in a high quality audio chain. In order to adapt the front panel
dimensions to the dimensions of other equipment, it is possible to remove the 19” brackets and
handles for an even more sleek and refined look.
Remove the two screws marked in red circles and slide off the handles.
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5. Technical specifications
RATED OUTPUT POWER, BOTH CHANNELS DRIVEN:
dynamics program power, all channels driven
bridge-mono operation 8 ohm
230 W
8 ohm / ch
75 W
4 channel mode 4 ohm
125 W
dynamics capacity at 2* ohm / single ch
180 W
* this value represents the dynamics at impedance dips at certain frequencies of some speakers,
* this amplifier is NOT designed to drive full 2 ohm loads (example 2 or 3 speakers of 8 ohm in parallel)
Sine wave power, both channels driven (not recommended, for reference only)
This amplifier is designed for an audiophile music experience, not for lab testing!
Bridge-mono operation 8 ohm
130 W
4 channel mode 8 ohm
60 W / ch
4 channel mode 4 ohm
80 W / ch
GENERAL TECHNICAL SPECIFICATIONS:
Input impedance / sensitivity unbalanced (RCA) / 4
ohm
10 KOhm / 1 V 0dBV
Frequency response
20 Hz – 40 KHz
THD
< 0.1 %
IMD
< 0.15 %
Noise
>100 dBA
Gain
26 dB (32 dB in bridged mode)
Damping factor
>100
Dynamics and level control
APC limiter
Protection circuits
DC, clip, overcurrent, short-circuit
Active filter channel 1 and 2 ‘100’ position
lowpass at 100Hz/12 dB/oct
Active filter channel 1 and 2 ‘AP’ position
APart-audio specific filter characteristic optimized for
APart-audio passive subs
Active filter channels 3 and 4
highpass at 100Hz/12 dB/oct
Temperature protection
90°C/ch + transformer 105°C
Cooling
convectional, no fan
Power consumption
26 VA idle, 400VA full program
Mains power requirements
230VAC, 50-60Hz
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PHYSICAL SPECIFICATIONS:
Net dimensions (cm) (W x H x D)
48.3 x 4.4 x 36
Gross dimensions (cm) (W x H x D)
56 x 10 x 55
Net weight
7.5 kg
Gross weight
9.0 kg
APart-Audio general warranty conditions:
APart-Audio warrants this product to be free of defects in material and workmanship for a period
of one* year for parts and for a period of one* year for labor from the date of original end-user
purchase. This warranty is valid only for the original end-user and cannot be transferred.
During the warranty period APart-Audio orone of its authorized service partners shall either repair
or replace any product, free of charge, that proves to be defective on inspection by APart-Audio or
its authorized service representative.
All warranty claims must be accompanied by a detailed description of the problem. All returns
must be sent to APart-Audio or an authorized APart-Audio repair centre, postage prepaid, insured
and properly packaged. Proof of purchase must be presented in the form of a valid invoice or
some other positive proof that the product is within the warranty period.
This warranty does not cover any defects caused by faulty installation, damage due to abuse,
neglect, alteration or attempted repair by unauthorized personnel, system mismatch, insufficient
maintenance or any damage caused by excessive mechanical stress and is strictly limited to
failures arising during normal use that are due to defects in material or workmanship in the
product.
Under no circumstance, APart-Audio or one of its service centres can be held responsible for the
loss of data caused by a repair or exchange operation.
APart-Audio reserves the right to change or improve the design and/or specification of the product
at any time without prior notice.
*warranty period may be different for your country. Please consult your local dealer.
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ANY SUGGESTION?
They are well appreciated and eventually rewarded!
Send your ideas or suggestions to
suggestions@apart-audio.com
Company names, product names, and names of formats etc. are the trademarks or registered trademarks of
their respective owners.
© 2009 APart-Audio specifications subject to change without notice.
CHAMP-4 is developed by
Audioprof nv
Lanteernhofstraat 90
BE-2100 Deurne
BELGIUM
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