Instruction Manual
www.calyxaudio.com
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Thank you for purchasing calyx product
Music is the most important messenger of human emotion as well as a meaning of its expression
since human beings appeared on this earth. Music created by amazing inspiration of many gifted
composers makes people moved and our normal lives enriched.
The absolute sound and real music performed in real space like concert halls are the most
important experience that makes people get to the musical essence. Besides, audio products re-
producing music are a way of modern civilization making our lives better.
Since 1999, the year of establishment, Digital & Analog Co., Ltd. (as known as D&A) has been
providing class-D I.C.s to various audio OEM companies. And D&A started to make its own high-
end audio products since 2008 and as a result, we succeeded to build audio products with
excellent measured performance which any other amplifiers were not able to reach so far. Calyx is
the by-product of such an effort based on D&A’s many experiences like designing, manufacturing
and selling of class-D ICs and supporting its customers to make their audio products using D&A’s
I.C.s. Calyx has been tested subjectively as well as objectively under a lot of test circumstances.
A great Chinese poet ‘Bai Ju Yi’ of the Tang Dynasty expressed sound as followings in on of his
book;
“A poem has passion as its root, words as its buds, sound as its flower and meanings as its fruits”
So we named our products as Calyx, in the meaning of corolla of music described as flower by
the renowned poet.
Calyx will enrich your life as a strong support of musical flower. This coincides exactly with our
slogan;
“Technology making the world affluent.”
Calyx is high-end products, which you can be proud of possessing it.
Digital & Analog Co., Ltd. has developed class-D amplification technology with many patents on
the technology.
From now on, we provide high-end audio products to music lovers like you
Thanks and enjoy the music.
Seungmok Yi
CEO/President
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Contents
1. WARNINGS--------------------------------------------------------------------4
2. Unpacking---------------------------------------------------------------------5
3. Preparation--------------------------------------------------------------------5
4. Description of Functions-----------------------------------------------------6
5. Connection Diagram ---------------------------------------------------------8
6. Guaranteed Specifications--------------------------------------------------11
7. Trouble-shootings-----------------------------------------------------------16
8. Warranty---------------------------------------------------------------------17
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1. WARNINGS
Please take a moment to read these notes before installing your Calyx Femti Amplifier, as they will
enable you to get the best performance and prolong the life of the unit.
As our engineers are striving for the constant research and development to develop the quality of products,
shape or structure of our model can be changed without previous notice.
※ We advise you follow all instructions, read all warnings and keep the instructions for future reference.
This symbol indicates that dangerous voltage which
can cause electric shock is present inside this unit.
Do not overload outlets or extension cords
▶ This can result in a risk of fire or electric shock.
Never touch the power cords or the unit with wet
hands.
▶ This can result electric shock.
Never use the frayed or damaged or cracked or
This symbol alerts you to important operating and
maintenance instructions accompanying the unit.
Do not put any objects on top of the unit.
▶ If the objects fall, it may cause harm to the user.
Please ensure there is ample ventilation
▶ The unit will become hot when in use
To clean the unit, please follow next instructions.
▶ Wipe its case with a dry, lint-free cloth.
broken power cords.
▶ This can result in a risk of fire or electric shock.
Do not expose the unit to rain or moisture.
▶ This can result in a risk of fire or electric shock..
Do not expose the unit to direct sun radiation or other
heat sources.
▶ This could lead to overheating and malfunction of
the unit.
During thunderstorms, disconnect the power cords
from the wall outlet.
▶ Voltage peaks due to lightning could damage the
unit.
Never attempt to repair, disassemble or reconstruct
Do not move the unit, while it is powered on.
▶ This can cause harm to the unit
Do not place the unit on an unstable surface or shelf.
▶ If the unit falls, it may cause harm to the unit or to
the user.
Do not use attachments not recommended by your
dealer
▶ This may cause harm to the unit
Do not listen to loud music for a long time.
▶ This may cause harm to user’s hearing ability
the unit.
▶ Serious electric shock could result.
Do not use any cleaning fluids containing alcohol,
ammonia or abrasives.
Do not spray an aerosol at or near the amplifier.
※ If the product needs repair, please contact your local Calyx dealer.
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2. Unpacking
Be sure to check the following items within the package.
1. Calyx FEMTI Amplifier Unit
2. Power Cord
3. Owner’s Manual
3. Preparation
● Calyx FEMTI Amplifier is set to 100~120V or 210V~230V depending on your local
requirement. If you want to change the voltage, please contact your Calyx audio retailer.
● Turn off the unit when selecting the output mode.
Calyx Femi Amplifier has three output modes. (Stereo mode, Mono mode, Bridged
mode).
● Unbalanced cable is sensitive to environmental noise and we recommend that you use
shorter length. Care must be taken when the Calyx FEMTI Amplifier is used in bridged
mono mode as its power is increased 4 times.
● The Calyx FEMTI Amplifier is designed to be very stable, but the unit may generate some
heat after a prolonged period of operation. Rest assure that is normal.
● Calyx FEMTI Amplifier’s speaker output is designed as balanced + and -. Care should be
taken not to touch the chassis or exposed speaker connectors of touching each other.
● On and Off sequence
Power On : Preamplifier on -> Calyx FEMTI Amplifier
Power Off : Calyx FEMTI Amplifer off -> Preamplifier off
● Do not remove the cover unless you are a certified technician.
● The Calyx FEMTI Amplifier is designed to exacting standard by applying highly technical
tuning and expert listening test. Your warranty will be void if you tune, modify or change
any part of the unit without prior consent from the manufacture.
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4. Description of Functions
Front Panel
Real Panel
`
AC-INLET INPUT SPEAKER OUTPUT
50 / 60Hz
OUTPUT MODE
SELECTOR
M
S
B
LED INDICATOR
M / B
IN
RL
+
R
+
L
BRIDGED BRIDGED
AC100 ~ 120V AC210 ~ 230V
1 Power Switch
This is located on the right side panel when you see from the front.
Press once to turn the unit on and once more to turn it off.
2 LED
Violet
The violet LED light indicates that the amplifier is normal status.
Blue
The blue LED turns on if a short circuit is detected on the speaker output terminals.
Red
The red LED turns on if the amplifier temperature becomes too high.
Calyx Audio
Made in Korea
+
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