Eficion F250 User manual

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The loudspeaker that sings
Owner’s Manual
F250

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Dear Customer,
We would like to thank you for choosing a pair of our speakers
and congratulate you on your choice. This manual is to provide you
information for properly setting up the speakers and to optimize the per-
formance.
Safety Precautions
Do not place any magnetic sensitive electronic devices, such as mag-
netic data storage systems and computers, within approximately two
feet of the speaker.
Please refer to Fig. 2 for proper speaker cable connections.
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Open the top &
Take out the top foam
Lay on the side (side of the speaker) &
Slide out the speaker along with foams
Fig. 1 unpacking
Note: accessaries such as spikes are contained in the
concave spaces of a packaging foam.

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+ AMPAMP -
F200
(A) Bi-wiring connections
(B) Single-wiring connections
Fig. 2 speaker cable connections
-+
+ AMP
AMP -
F200
-+
Jumper
Note: the jumpers removed
Jumper

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Unpacking and Handling
The F250 is both heavy and relatively delicate, and must be handled
with care. When moving the speaker still in the cardboard box, gentle
rolling is generally allowed. But dropping from any height should abso-
lutely be avoided. It is preferable to unpack the speakers close to the
position at which they are to be used.
Fig. 1 illustrates a way to take the speaker out of the box. Please note
that accessories, such as spikes, are placed in the concave spaces of a
packaging foam.
Speaker Placement
The speakers should be placed 7 to 9 feet apart (measured between
nearest sides) for a natural sound stage. Too far apart, while focus still
maintains, the sound stage may become artificially wide. An ideal
listener to speaker distance should be that the two speakers and the
listener are at three corners of an equilateral triangle. Ideally, the speak-
ers should be at least one foot away from the back and side walls.
Moving the speakers further from the walls will generally reduce the
volume of bass. Space behind the speakers will also help to expend
depth of the sound stage. Because of the uniform sound dispersion of
an air motion transformer (AMT) tweeter being employed by the F250,
distance to the side wall of the F250 is not as critical as that of dome
tweeter speakers. For the same reason, toe-in (speakers pointing at the
listener) is generally not needed, in fact, not preferred as less toe-in may
fill the room better.
Most room treatment experiences are developed based on the widely
used dome tweeter which beams sound and tends to have problems
with rooms. Because the F250’s AMT tweeter, which is a dramatic depar-
ture from traditional dome tweeters, has a wide and uniform horizontal
dispersion pattern, the F250 is less affected by the room, and placement
is relatively more forgiving. However, since the F250 produces substan-
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tial amount of bass, bass traps, especially at the corners, can often
make quite a difference. Hanging heavy fabrics at the corners can be a
simple yet elegant solution.
Bulky objects, such as a tall equipment rack or a rear-projection TV set,
placed directly between two speakers have negative effect on the sound
stage. They should either be moved as far back as possible or at least
be covered with a sound absorbing material, such as a heavy curtain.
Speaker Installation
It is important to ensure that the speakers stand firmly on the floor
using the height adjustable spike feet supplied whenever possible. The
spike feet are designed to press the carpet to the floor surface. For hard
surface floor, place a puck supplied underneath each spike foot.
Tapes covering the tweeters need to be removed before powering up
the speakers. First you need to gently pull off the grilles, then you will
see the tapes.
The F250s can be connected in either single-wiring or bi-wiring configu-
ration. Fig. 2 illustrates cable connections for the speakers. In the
bi-wiring configuration shown in Fig. 2A, jumpers are removed. For each
speaker, a pair of speaker cables is used to connect the upper and lower
bonding posts on the back of the speakers separately to the amplifer. In
the single-wiring configuration, a jumper is used to connect the upper
and lower bonding post on the back of the speaker. Then for each
speaker, only one speaker cable is used to connect either the upper
(preferred) or lower bonding posts to the amplifier. Generally, bi-wiring
is preferred, especially when the amplifier has ample power.
Keeping cable as short as possible may be more beneficial than an
expensive but long cable, as inductance, which affects high frequency
response, is proportional to the cable length. See inductance equation
in straight wire conductor:
5
)1
4
(ln08.5 −⋅⋅= dl lL

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where L = inductance (nH), l = length ofconductor (in), and d = diam-
eter of conductor (in). Apparently increasing diameter is far less effec-
tive in reducing the inductance than reducing length of the wire.
Break-in Period
The performance of the speaker will change subtly during the initial
listening, as the suspension materials of the drivers need time to loosen
up. Generally 8 hours of break-in will get you most of the performance.
However, as many as 80 hours may be needed to fully break in the
woofer.
To some people, the break-in process is also a psychological one, as our
brains need to re-tune to a new kind of sound. Fully appreciating the
F250 may not happen until after about a week of listening to it.
Aftercare
The cabinet surfaces usually only require dusting. Soft cloth damped
with warm water may be enough to remove grease. If you wish to use
chemical agents, chose with caution and always test first on a small area
on the back of the speaker. Avoid products that are abrasive, or contain
acid, alkali or anti-bacterial agents. Do not use cleaning agents on
diaphragms of the drivers. Do not cause strong air flow to or from the
tweeter diaphragms.
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Specification
Design: 3-way vented box.
Frequency response: 30 Hz - 35 kHz.
Sensitivity: 90 dB/2.83V/1m.
Impedance: 8 ohms (minimum 6.4 ohms).
Tweeter: air motion transformer, diaphragm area: 2-1/3" x 1".
Midrange: 5", non-woven carbon fiber sandwich cone.
Woofer: 10", non-woven carbon fiber sandwich cone.
Crossover: 2000 Hz and 210 Hz.
Dimensions (HWD): 42.5″×14.2″×15.4″.
Weight (net): 104 lb/pc.
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