Sonnet Digital Audio Acelec Model One User manual

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Owner’s Manual

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Introduction
Dear Customer,
Thank you for your decision to acquire Acelec loudspeakers.
very Acelec model features the advanced Acelec loudspeaker technology by using the
bitumized aluminum panel construction technology, resulting in music reproduction at a very
high level. This advanced technology results from many years of intense research and
development, the highest quality standards in production, and Acelec‘s passion for music.
The Acelec brand is made under the hood of Sonnet Digital Audio and is one of very few
companies who can realize such loudspeaker concepts through its own in-house
development and production facilities. To realize the highest sound quality from the
loudspeakers, some areas should be addressed, as will be explored on the following pages.
By considering the tips and suggestions, you will achieve the maximum performance and
enjoyment of the loudspeaker and it‘s advanced musical capabilities for a long time to come.
We wish you many years of enjoyment experiencing music,
You’re sincerely
Sonnet Digital Audio

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Introduction
The initial set-up of the Model One loudspeaker is relatively easy.
Please take your time reading the guidelines and more detailed
instructions on the following pages of this manual after completing
the first four steps as listed below.
1. Unpacking. Carefully remove the loudspeaker from the packaging
and position it with its underside on the floor. Remove the plastic
bag cover around the loudspeaker. We suggest that you keep the
packaging for future use.
2. Positioning. Place the loudspeaker facing the listening area at its
desired position in the room. Remove the foam plugs from the rear
bass reflex port.
3. Connecting. While the amplifier is switched off, connect each
loudspeaker to the amplifier with the speaker cable. Turn the
volume level all the way down and power the amplifier on.
4. Listening. The loudspeaker is now ready to play. Optimal
performance will only be realized after careful positioning and
running-in the speakers as described over the course of the
following pages.
Feel free to contact the Acelec Customer Service department with
further questions or for additional assistance.
https://www.acelec.nl/Support.html

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Safety Instructions
HIGH SOUND PRESSURE LEVELS CAU ION
Listening to high sound pressure levels over a longer period of time may harm your
hearing.
 To avoid auditory effect do not listen to high sound levels over a longer
period of time.

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Connecting
Fig. 1 Binding posts at rear of cabinet (example)
Connecting the loudspeakers
1. Connect a two-pole (+/-) loudspeaker cable to the binding posts, located
at rear of the cabinet (see Fig. 1). The high quality, gold plated binding
posts can accommodate different connection systems:
– 4.0 mm banana plugs: The pins can be put directly into the binding
post without any tightening necessary.
– Cable spades: Un-tighten the binding posts, insert the spade into the
opening, and secure the spade by tightening the posts (exc. mit).
– Bare wires: Un-tighten the binding posts and place the cable into the
binding posts. Tighten the posts.
Note
• With every connection system, ensure that the contact is tight and has a
proper contact area.
• Connectors with similar gold plating as binding posts will typically offer
the best results and remain corrosion-free.
• Please ensure that the positive and negative cables do not make contact
with each other. Tighten the posts, and check the contact after a few
days to make sure that it hasn’t loosened.

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Connecting
2. Connect the other cable ends to the loudspeaker outputs of your
switched off power amp (see Fig. 2).
Note
Please make sure that the red marked post of the speaker is connected to the red
marked output of the amp, and the white or black marked post to the white or black
marked output accordingly.
Bi-wiring/bi-amping
The Model One feature a carefully fine-tuned cross-over, optimized using selected
parts and an advanced circuitry to achieve a truly balanced and smooth frequency
response. Therefore, dividing the frequency sections through bi-wiring or bi-amping
is neither beneficial nor optional.
Choice of loudspeaker cable
The loudspeaker cable can have an impact on sound quality. In general, quality cable
products will yield a quality result.
The Model One is designed to be very neutral and thus are not extremely suited to any
particular type of cable. The choice of cable is as much a factor of matching the cable
to the entire audio system. Please consult your local dealer for information about
compatible loudspeaker cables that will suit both your electronics and your
loudspeakers.
Fig. 2 Amplifier loudspeaker outputs (example)

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Positioning
Fig. 3 Positioning the loudspeakers
Acelec loudspeakers consist of classic bass reflex loudspeaker designs with no
unusual or extraordinary positioning demands. very room will still have its own
particular sound characteristics. Any room is also shaped and decorated uniquely, and
therefore remains independent regarding options for positioning loudspeakers. The
following steps are general suggestions that will make the correct positioning easier to
achieve.
General recommendations
Following explanations refer to Fig. 3:
• The distance between each loudspeaker and your listening position should be the
same (B). Try to achieve an isosceles triangle.
• The distance between the loudspeakers should be the same or better slightly less
than the distance between each loudspeakers and your listening position (A, B).
• The closer the listening position is in relation to the loudspeakers, the closer the
speakers can be positioned to each other.
• As a starting point, it is recommended that the speakers be about 2 meters apart
from each other for the best results (A).
• If the speakers are positioned too close to each other, the stereo image will not
seem realistic; if that distance is too wide, the image may leave an acoustic hole
in the middle.
• Paying attention to the image during listening tests will help dictate optimum
placement during experimentation and set-up.

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Positioning
Distance to back and side walls
very loudspeaker not only disperses sound energy directly into the room, but also to
the side and even backwards. As a result, time-delayed reflections occur and add to
the original music signal. Thus, when loudspeakers are positioned too close to walls,
the sound quality can be restricted.
Acelec loudspeakers were developed to be placed free-standing, and therefore they
reach their optimum performance when positioned as clear of any walls as possible.
 To minimize potential influences from the back and side wall boundaries, it is
recommended that the distance from the speakers to each is at least 0.5 meters,
and ideally the distance from each speaker to the back and side wall should not
be equal.
Adapting the bass reflex port
To minimize low frequency reflections, which will be heard as a thickening of the
sound, the loudspeaker models can be adapted to the room’s acoustic character by
using foam plugs in the bass reflex port. This will essentially attenuate the room-
induced boost in the low frequency range by dampening the deep frequencies,
yielding a more clear and tight sound when the loudspeaker is positioned near rear
Fig. Distance to walls
walls.
 Fully insert the foam port plugs packed with your loudspeaker into the bass reflex
tube, to attenuate the bass output (if required).

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Positioning
Floor-standing loudspeaker set-up
The floor-standing models feature a special base construction, which offers both an
ideal performance and mechanical basis. Integrated into the base plinth are four
individual spike assemblies. These stabilize the cabinet on an extremely small contact
area, and therefore prevent any wobbling while offering optimal resonance control. The
individually adjustable spikes allow leveling of the cabinet on uneven floors.
CAU ION SPIKES WI H SHARP PEAKS
The sharp peaks of the spikes may cause injuries and damage sensitive surfaces like
hardwood flooring or tile.
 Be careful when handling the loudspeakers.
 Place plates between the spikes and the surface to protect the underlying
surface.
Compact loudspeaker set-up
The Model One is designed to offer exceptional performance while taking up minimal
space. The Model One will realize his optimum performance when used in conjunction
with a dedicated stand to position them at the proper height while absorbing any
resonance.
Due to its dimensions, you can also place the loudspeaker on a ledge or shelf or on
top of furniture. But to avoid the possibility of any negative influence on sound quality,
one should take care to utilize a stable surface offering a wide enough space in front
of the loudspeakers as to not limit the sound quality and performance.
In such applications or if placing the speakers in enclosed audio/video furniture, the
bass reflex port can usually be left unplugged as long as there is minimal clearance
to the boundaries at the top and rear of the loudspeaker cabinet.

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Positioning
Loudspeaker oe-In
Depending on your personal listening environment and room dimensions, the
loudspeakers may be angled in towards the listening area to focus the sound
radiation. This positioning will typically improve imaging and is especially
recommended by Acelec (see Fig. 5).
Room and furniture influence
The sound quality of any loudspeaker is influenced by the furniture, wall
materials and other objects in the listening room. For example, large rooms
without much furniture and many clean, hard wall surfaces can give a bright and
diffuse sound with diverse echoing frequencies. A room with thick carpet,
curtains and soft furniture surfaces will give a warmer, darker and less lively
sound.
Fig. 5 Angle inwards loudspeakers to
improve imaging.

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Running-in / Care & Maintenance
Running-in the loudspeakers
The moving parts of a newly manufactured Model One loudspeaker have been
acoustically checked after production, but nevertheless are not as flexible as they need
to be for optimum results to be realized. The higher the quality of any driver system, the
more demanding the loudspeaker will be regarding time for running-in the system.
A newly unpacked Model One loudspeaker therefore requires several weeks running/
playing to reach its optimum performance capability. After that period, a couple of
minutes before every listening session will be helpful to “warm up” the loudspeakers.
Power rating
Due to the construction and the driver technology The Model One loudspeakers can be
driven with very high power levels. With a high quality amplifier, delivering undistorted
signals, the speaker can achieve high levels without any compromises in sound quality.
Attention must be given to amplifiers with very low power and adjustable tone controls
or switches. These types may soon overreach their own performance limits and may
send distorted output signals to the speakers, compromising even high quality techno-
logy. Any damage caused under such circumstances is not covered by the Acelec
warranty and is easily avoided in the first place by consulting Sonnet Digital Audio for
advice regarding the choice of amplifier.
CAU ION DIS OR ED OU PU SIGNALS
Distorted output signals from too weak, defective or overloaded amplifiers may
damage the loudspeakers.
 Use high quality amplifiers only and run loudspeakers and amplifiers within
specified power ratings.

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Running-in / Care & Maintenance
The Model One requires no special treatment apart from the kind of careful
handling you would normally apply to any high tech product in your home.
AGGRESSIVE CLEANING FLUIDS CAU ION
All
-in-one cleaning materials, aggressive cleaning fluids or special furniture polishes
may damage the cabinet surface or other speaker parts.
Use a soft dry or slightly damp cloth when cleaning the cabinet and other
plain parts.
Cleaning the loudspeakers:
Switch off all components of your system when cleaning any of these
components.
Avoid touching the AMT tweeter as any change of their shape may have an
impact on sound quality.
Clean the cabinet and other plain parts with a soft dry or slightly damp cloth only.
Remove dust on the woofer diaphragms with a fine furniture brush.
All materials used by Model One are integrated with exceptional care. By taking care
of your loudspeakers , you will preserve the finish and build quality for very long time

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Technical specs.
Acelec Model One
System Format 2-way
Housing 15 mm bituminized aluminum
Bass Alignment Low Q alignment Vented port system.
Frequency Response (-6 dB) 45 Hz – 35 kHz Max. deviation ± 2.5 dB
Sensitivity (1W@1M) 84 dB
Nominal Impedance 8 ohms
Minimum Impedance 5 ohms at 375 Hz
Maximum SPL 110 dBA (Pair)
Power Handling (RMS) 120 W
Recommended Amplifier Requirements 25 – 100 W
Crossover Frequency 1.8 kHz
Drive Unit Complement 15cm bass / mid transducer, 18 mmAir Motion Transformer
Cabinet Dimensions (H x W x D) 285 x 195 x 300 mm
Finish Silver or black finish. Special versions or colors on request
Weight 17 kg

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Warranty
Acelec
provides a transferable limited manufacturer’s warranty of two years. This warranty
only covers faults or defects in material and production. Damage caused as a result of
abuse, misuse or defective electronics is not covered by the warranty. All warranty
claims must be accompanied by a copy of the original purchase invoice and war-
ranties are only valid in the country or market of original origin or distribution. Should
warranty service be required, it must be arranged for in the country of purchase by an
authorized Acelec dealer. All performance criteria are strictly controlled. In the whole
production procedure – from raw materials to the final assembly – Acelec thoroughly
inspects all parameters along every step of way.
acelec is a brand name of:
Sonnet Digital Audio BV
Daviottenweg 9-11,
5222 BH 's-Hertogenbosch
The Netherlands
https://www.acelec.nl