impact 400
impact 400
Owner’s Manual
impact 400
Thank you choosing Amphion Impact 400 subwoofer. The Impact 500 is made to
the highest standard and will provide you with years of listening pleasure when
properly cared for. Follow these instructions to ensure that you get the maximum
performance from your subwoofer.
Safety Instructions
This product is designed and manufactured to meet strict quality and safety standards. However, you should
be aware of the following installation and operation precautions:
1. You should read all the safety and operating instructions before operating this appliance. Retain this
manual for future reference and adhere to all warnings mentioned here or on the appliance.
2. The presence of electricity near water can be dangerous. Do not use the appliance near water,
for example next to kitchen sink, washbowl, bathtub, in a wet basement or a swimming pool area etc.
3. Take care that objects do not fall or liquid spilled into the enclosure through any openings. Liquid filled
objects such as vases should not be placed on top or near the subwoofer.
4. We recommend a minimum distance of 50mm (2 inches) from the rear of the appliance (heat sink) to provide adequate ventilation.
5. Place the product away from naked flames or heat producing equipment such as radiators, stoves or other appliances (including other amplifiers) that produce heat.
6. The appliance has been designed for use in moderate climates.
7. Unplug the unit from the mains supply before cleaning. Do not use paint thinners or other chemical solvents for cleaning.
8. Power supply chords should be positioned so that they are not likely to be walked on or crushed by items placed upon or against them.
9. Ensure that the mains voltage selector is in proper position referring the voltage used in your country (115/230V).
10.Locate any outdoor antenna/aerial away from power lines.
11.If an abnormal smell or smoke is detected from the appliance, turn the power off immediately and
unplug the unit from the wall outlet. Contact your dealer immediately.
12.You should not attempt to service the appliance beyond that described in this handbook. All other
servicing should be referred to qualified service personnel.
13.The appliance 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 spilled into the appliance
c) the appliance has been exposed to rain
d)the appliance does not appear to operate normally or exhibits a marked change in performance
e)the appliance has been dropped or the enclosure damaged
This product has been designed to meet the IEC 60065 international electrical safety standards.
Connections and subwoofer controls
Mains voltage switch
Power switch
Fuse box *)
Power cord socket
Speakers out connection
Speakers in connection
Volume control
8. Indicator light (green=on, red=stand-by)
9. Auto-power-on switch **)
10.Low pass crossover adjustment
11.Subwoofer crossover adjustment by-pass switch
12.Phase switch
13.Line level input (RCA input)
14.Line level output (RCA output)
*) Subwoofer fuse is housed in a fuse box which is located in the power cord housing. The fuse box can be opened by pulling it out –
place a small screwdriver to the slot which is inside the opening of power cord socket housing. Always replace the burned fuse with
one of the same value. The correct values are also indicated in the subwoofer control panel.
**) Subwoofer is equipped with auto power-on function, which switches on the power when the subwoofer detects an incoming signal.
If no signal is detected in 10-15 minutes the subwoofer is switched off automatically. Auto power on is selected by placing the Auto-on
switch to ON position.
Liittimet ja säätimet
impact 400
Connecting your subwoofer
Subwoofer can be connected to either a hi-fi or home theater system in various ways depending on usage
and listening habits.
NOTE! When connecting the subwoofer all the power must be turned off both from the subwoofer
and the equipment to which the subwoofer is being connected to.
1. Moderate listening levels, best sound quality
(Picture 1)
3. Connecting between the pre- and power
amplifiers (Picture 3)
When optimum sound quality especially with music is required the subwoofer will be collected as
•Connect the speaker from the amplifier to the
speakers (L and R). Use another pair of speaker
wires to extend the wires from the speaker
terminals to the subwoofer’s SPEAKER LEVEL INPUT (L and R).
• Place INTERNAL X-OVER/DIRECT-switch to position “internal x-over”.
In some systems it is possible to connect the subwoofer between pre- and power amplifiers, when
the filtering of bass frequencies works better than
when connected to speaker signal (connection method 2). The connection takes place as follows:
•Connect “preamplifier out” with RCA equipped
interconnects to the subwoofer LINE LEVEL INPUT
incoming connectors (L and R) and connect the
subwoofer’s LINE LEVEL OUTPUT outgoing connector
RCA inter-connects
•Place INTERNAL X-OVER/DIRECT switch to position
“internal x-over”
This position does not limit the signal in any way, so
it is possible that small main speakers with limited
power handling can become strained with high listening levels. The possibility of this occuring is reduced
when larger speakers are used.
2. High listening levels, good sound quality
(Picture 2)
When high listening levels are used the subwoofer
should be connected as follows
•Connect the speaker from the amplifier to the subwoofer’s SPEAKER LEVEL INPUT (L and R).
Use another pair of speaker cables from the
subwoofer’s SPEAKER LEVEL INPUT (L and R) to the
speaker’s left and right terminals.
•Place the INTERNAL X-OVER/DIRECT switch to
position “internal x-over”.
This connection method filters out the lowest bass
frequencies, so that the main speakers do not become strained.
4. Connecting to home theater amplifiers LFE
output (Picture 4)
When the subwoofer is used with small satellite
speakers in a home theater setup, one recommended way is to the connect the subwoofer to the
surround amplifier´s LFE output as follows:
•Connect an RCA-signal cable from the home
theater amplifier’s LFE output to the subwoofer’s
•Place the INTERNAL X-OVER/DIRECT switch to the
‘direct’ position
In all scenarios also experiment by blocking the bass
reflex tubes, which allows the speakers to integrate
with the subwoofer in the best possible manner.
impact 400
Picture 1
Picture 2
4 pcs male/male RCA-cable
Picture 3
male/male RCA-cable
Picture 4
impact 400
Subwoofer positioning
Reversed location search
All speakers - subwoofers included - require proper positioning to provide maximum performance.
Improperly placed and adjusted speakers will degrade the sound quality, therefore reducing listening
pleasure. In many cases ‘perfect’ placement may not
be possible and finding the most suitable position for
your environment will probably require some experimentation. Please try different locations during the
setup process to find out what works best in your
listening room.
In same cases it is easier to find the ideal location by
positioning the subwoofer in the listening place and
moving around the room at floor level. Locate the
places where the bass reproduction throughout the
all lower frequencies is most even. The stability of
stereo image and matters relating to room aesthetics and interior decoration also often dictates the
placement of the subwoofer. Please note that when
using this method the subwoofer should be located
in a position around 1 meter from the floor.
General guidelines for subwoofer placement
Adjusting the subwoofer
Place the subwoofer along the same wall as the
main speakers. Normally the best possible position
is somewhere between the main speakers. Do not
place the subwoofer in the centre point of the back
wall as this is the minimum point of the lowest
standing wave. This leads to a dip in the systems
frequency response in the middle of the bass area
and results in a reduction of these frequencies.
Usually the best place is found behind the centre
point of the wall and the other main speaker, slightly
away from the back wall. If there is no space between the speakers, it is possible to locate the subwoofer outside the main speakers but this may lead
to a slight reduction in the stereo image and bass
possibly being localised to the subwoofer.
The Subwoofer can be adjusted to match the main
speakers by the controls on the back panel. Depending on the size and sensitivity of the main speakers,
the subwoofer’s crossover and level are adjusted
via LOW-PASS CROSSOVER and VOLUME controls. It is
also possible to reverse the phase of the sub by the
PHASE switch.
Various factors, such as main speakers, room acoustics and listening preferences affect the settings and
therefore a ‘rule of thumb’ exists. It’s best to experiment to find the best settings for your own listening
Crossover frequency (LOW-PASS CROSSOVER)
Finding the best location by listening
The best location for the subwoofer can be located
by listening and experimenting with different locations. Special low frequency information test records
- which may make this easier - are also available.
Listen to a recording containing low frequencies and
move the subwoofer around until you find a position
where the reproduction of various frequencies are
as balanced as possible. Having someone to help
move around the subwoofer will make it easier to
compare different locations. It is possible that there
are more than one places which generate an even
frequency response. Stereo imaging and interior
decorative issues will help to choose between those
places which have an even response.
The first task is to find the correct crossover frequency. The acoustical properties of a room and standing
waves affect the bass response and also the required crossover settings. Therefore the best result can
be only achieved by listening. Using a test disc helps
evaluate the point in the crossover where bass response starts to dip.
Finding the correct phase (PHASE)
The next step is to adjust the phase of the subwoofer. The correct phasing depends on the position
of the subwoofer in relation to the main speakers.
The goal is to ensure that the main speakers and
subwoofer are in the same phase at the crossover
frequency. The correct setting will be achieved by
testing both settings, phase 0 and phase 180. Listen
to either a test signal or music based around the
impact 400
crossover frequency and listen to the subwoofer in
both phase settings. The setting is correct when the
bass response sounds more powerful and natural.
With incorrect phase the bass response the is more
vague and reduced.
Sound level (VOLUME)
The final stage of the set up process is finding the
right volume level to the subwoofer. At the correct
volume setting the subwoofer will form an integral part of a complete loudspeaker system. If the
volume is too high the reproduction will be “heavy”
and mask lower frequencies. This will also lead to a
situation where the subwoofer can be localized and
creates a separate sound source.
Filtering incorporates Amphion proprietary CSC
technology (Cumulative Stage Coupling), where
the steepness of filtering increases gradually when
frequency increases. This ensures that the phase
changes are as linear as possible and group delay
is minimized. At rejection band (>150Hz) the 5th
order filtering is used (30dB/oktave) which leads
to effective filtering of upper frequencies and solid
stereo imaging. Filter can be by-passed by x-over/
direct- switch when connecting subwoofer to the LFE
channel of the home theatre amplifier.
Technical specifications
• Class-D
• RMS 500W output
• T.H.D. --- <1%
• Line voltage 115/230 vac switchable
• Anti-clipping circuit
• Over load protection circuit
• Phase control switch --- 0-180°
• Auto-on switch
• Auto turn-on level --- 3 mV
• Time to stand-by --- 10-15 min
• Volume control, range --- >70dB
• Variable crossover control, adjust range --- 30-100 Hz
• X-over/direct switch
• Line level input (R,L), max. sensitivity --- 80mV
• Line level output (R,L)
• Speaker level input (R,L), max sensitivity --- 2V
• Speaker level output
• Twin color LED indicator for signal ON/OFF
• Power switch
• Fuse T5AL 250V for 230V input or T9AL 250V for 115V input
• Long stroke high power 10” unit with nomex- cone
• Frequency range: –3dB: 19Hz
• Measurements: 350 x 350 x 387 mm
Warranty: General: 5 years parts and labour
Amplifier module: 12 months from the date of purchase
Amphion Loudspeakers Ltd.
P.O.Box 6
70821 Kuopio
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