Senal asm-3 User manual

ASM-3
USER’S GUIDE
Table of Contents:
Introduction ................... 2
Overview ........................ 3
Precautions .................... 4
Setting Up ..................5-9
Specifications ........ 10-11
Troubleshooting ....12-13
Warranty ....................... 14

2
Thank you for choosing Senal.
The ASM-3 Two-Way Active Speakers are a pair of powered
stereo speakers designed for near-field monitoring in
professional audio applications. Their convenient size
makes them equally ideal for desktop audio systems. The
ASM-3 features active filter technology and a dual-channel
power amplifier, driven by a 3″ woofer and 0.8″ metal dome
tweeter that deliver a wide and flat frequency response with
pristine audio reproduction and accurate sound imaging. The
cabinet’s curved port tube provides natural low-frequency
output and minimizes distortion, while the ellipsoidal
design and rigid, high-intensity aluminum alloy construction
prevent diffraction and cabinet resonance. This meticulous
engineering allows the ASM-3 to handle high sound pressure
levels in an ultracompact cabinet size.
Fine-tune settings allow the user to adjust the high, mid, and
low frequencies to compensate for the listening environment,
speaker placement, and audio source. Each ASM-3 comes
with a rubber base that isolates the speaker from its resting
surface to prevent resonant coupling, and makes it easy to
adjust the vertical angle of the speaker to down fire or up fire.
The speakers can also be mounted on a wall or a stand via the
mounting threads on the cabinet.
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Introduction

3
Overview
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Fine-tune settings
HF High frequency
MF Mid frequency
LF Low frequency
Overview
Power LED
Also Included:
Stereo 3.5 mm to RCA Y-cable
Two (2) AC power cables
User manual
SE TTING
HF M F L F
Tweeter
Woofer
Power switch
Volume control
Vent
Mounting threads
Rubber base
SET TING
HF MF LF
Frequency adjust terminal
Power input
RCA input
Mounting thread

4
Precautions
▪ Please read and follow these instructions, and keep this
manual in a safe place.
▪ Exposure to high sound levels can cause permanent
hearing loss. Avoid listening at high volumes for extended
periods of time.
▪ Keep this product away from water, moisture, and any
flammable gases or liquids.
▪ Make sure this product is powered off when plugging it
into a power source.
▪ Use only the correct, recommended voltage.
▪ Do not attempt to disassemble or repair this product.
There are components inside that can produce a
hazardous electric shock.
▪ Handle this product with care.
▪ Clean this product with only a soft, dry cloth.
▪ Keep this product away from children.
▪ All photos are for illustrative purposes only.
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Precautions

5
Setting Up
Mounting the Speaker
For desktop placement,
place the speaker on the
included rubber base. This
base serves to isolate the
speaker from its resting
surface and prevent
resonant coupling. The base
is designed to make it easy
for you to adjust the vertical
angle of the speaker to
down fire or up fire, so you
can aim the acoustic axis at
the listener’s ear.
The speaker may also be mounted on a wall via the mounting
threads on the rear of the cabinet, or on a speaker stand via
the threaded mount on the bottom of the cabinet. To mount
the speaker on a wall, you can use the Senal speaker bracket
kit, sold separately.
Setting Up
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3.5˝
R
R
R
RCL
L
L
C
L
LS RS
LS RS
110°
30°
R
R
R
RCL
L
L
C
L
LS RS
LS RS
110°
30°

6
Speaker Placement and Positioning
Position the speakers 2.3′ to 6′ (0.7
to 1.8 m) from where the listener will
be situated, and aim the tweeter
at the approximate height of the
listener’s ears. There should be no
obstructions between the speakers
and the listener. Each speaker
should be 7.9″ (20 cm) or more from
the wall to prevent early reflections,
which can interfere with stereo
imaging.
For stereo placement, space the two speakers equally to form
an equilateral triangle with the listener at the third point of
the triangle.
For optimal audio performance, the listener should be on the
centerline of the room.
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Setting Up
R
R
R
RCL
L
L
C
L
LS RS
LS RS
110°
30°
R
R
R
RCL
L
L
C
L
LS RS
LS RS
110°
30°
7.9˝

7
The Listening Environment
A room with dimensions that are multiples of each other,
such as a room that is twice as wide as it is tall, may result
in standing waves that can blur the bass frequencies. Large
areas of a smooth material like glass will cause acoustic
reflections and may interfere with sound-field reproduction
and imaging. You can avoid reflections by strategically
placing sound-absorbing materials like acoustic foam,
carpeting, and heavy curtains around the room.
Connecting the Speaker
1. Plug the stereo 3.5 mm connector of the included audio
cable into the audio output of your audio source.
2. Plug the left and right RCA connectors into the audio
inputs of the left and right speakers.
3. Use the included AC power cables to plug the speakers
into an AC power source.
4. Turn on your audio source and the speakers.
Setting Up
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Audio Source
Power Source

8
5. Use the volume controls on the speakers and your audio
source to adjust the audio level. When using an audio
source that has its own master level, such as a recording
console, turn the volume on the speakers all the way up,
and control the volume through the master level on the
console.
Fine-Tune Settings
You can fine-tune the frequency response of the speaker via
four fine-tune settings on the rear of the cabinet.
You can adjust the high frequency (HF) by ±1 dB and the low
frequency (LF) by ±2 dB. We recommend adjusting these to
suit the listening environment.
You can adjust the mid frequency (MF) by
-2 and -4 dB. We recommend adjusting
these to suit your speaker placement.
When the speaker is placed on a stand or
mounted on a wall, we recommend setting
the MF switch to 0. When the speaker is
placed on a desk or table and its face is
3.1″ to 9.8″ (8 to 25 cm) from the edge of
the desk, we recommend setting the MF
switch to -2. When the speaker is more than
9.8″ (25 cm) from the edge of the desk,
we recommend setting the MF switch to
-4. These measurements are approximate
and will depend on your specific listening
environment.
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Setting Up
HF MF LF
HF MF LF
HF MF LF

9
Setting Up
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The frequency adjust terminal is for testing and adjusting the
curve. It had been adjusted in an anechoic chamber to its
optimal position, and we strongly recommend that you do
not adjust this setting.

10
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Specifications
Specifications
System series: Professional monitor active filter
speaker system
System type: Two-way vented
Drivers configuration: 3″ (76.2 mm) midwoofer, 0.8″
(20 mm) metal dome tweeter
Frequency range: 75 Hz to 20 kHz
(±2.5 dB, free space)
Harmonic distortion: 330 Hz to 20 kHz ≤1% (85 dB/1 m)
Filter type: Professional active filter
Rated power: 28 W RMS/channel
Active crossover
frequency:
3.0 kHz
Bass adjustment range: + 2, 0, -2 dB (100 Hz)
Mid-low adjustment
range:
0, - 2, -4 dB (200 Hz)
Treble adjustment range: +1, 0, -1 dB (10 kHz)
Signal-to-noise: >96 dB
Input sensitivity: 350 mV
Input impedance: 12,000 Ω
Maximum input: 3,000 mV
Finish: High-intensity aluminum alloy
cabinet
Dimensions per speaker: 5″ × 7″ × 4.8″
(127 × 177.8 × 121.9 mm)
Weight per speaker: 3.5 lb. (1.6 kg)

11
Specifications
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Distortion Curve
Total Harmonic Distorion：SPL,2H,3H, Harmonic Distortion：
100
80
60
dB
40
20
0
20 200Hz 2k 20k
Harmonic Distortion: 100mV/1m (Fund, 2H, 3H)
0
-20
-40
dB
-60
-80
20 200Hz 2k 20k
Total Harmonic Distortion: dB and % (THD)
10%
1%
0.1%
Distortion Curve
Total Harmonic Distorion：SPL,2H,3H, Harmonic Distortion：
100
80
60
dB
40
20
0
20 200Hz 2k 20k
Harmonic Distortion: 100mV/1m (Fund, 2H, 3H)
0
-20
-40
dB
-60
-80
20 200Hz 2k 20k
Total Harmonic Distortion: dB and % (THD)
10%
1%
0.1%
Distortion Curve

12
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Troubleshooting
Troubleshooting
Problem Reason Solution Comment
There is no
sound coming
from the
speaker.
The power
cable is not
connected.
Connect the
power cable.
The speaker is
turned off.
Turn the
speaker on.
There is a
short circuit
or the audio
source is not
connected to
the speaker.
Check
whether the
audio cable
has a short
circuit or is
disconnected
from the
speaker. If
necessary,
plug the
cable into the
speaker.
If the audio
cable
connector
is oxidized,
worn out, or
corroded, we
recommend
replacing the
connector or
the cable.
The volume
control is
turned down.
Turn up
the volume
control on the
speaker or the
audio source.
There is
no sound
coming from
one of the
channels in a
multichannel
setup.
The
balance of
the audio
source is
not set
properly.
Adjust the
balance of
the audio
source.
This usually
occurs
when
configuring
two or
more
channels.

13
Troubleshooting
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Problem Reason Solution Comment
The sound is
distorted or
noisy.
The speaker
is not placed
correctly or
the listening
environment
is poor.
Place the
speaker
correctly
or improve
the listening
environment
according
to the
instructions in
this manual.
The fine-tune
settings on
the speaker
are not
adjusted
correctly.
Adjust the
fine-tune
settings
according
to the
instructions in
this manual.
The fine-tune
settings can
be adjusted to
compensate
for the listening
environment,
speaker
placement, and
audio source.
The audio
source has a
malfunction
or the quality
of the audio
source is poor.
Check your
audio source
to determine
the cause
of the
malfunction.
The
connection
between the
audio cable
and the
speaker is
poor.
Make sure
the audio
cable is fully
plugged into
the speaker
and the audio
source. If
necessary,
plug the
cable into the
speaker.
We suggest
using one of
the included
high-quality
audio cables
or a cable of
comparable
quality.

14
Warranty
Senal provides a limited warranty that this product is free
from defects in materials and workmanship to the original
purchaser under normal use for a period of one (1) year
from the original purchase date or thirty (30) days after
replacement whichever occurs later. Our responsibility with
respect to this limited warranty shall be limited solely to
repair or replacement, at its option, of any product which fails
during normal consumer use.
To obtain warranty coverage during the Warranty Period,
contact your place of purchase (“Seller”) to obtain a return
merchandise authorization (“RMA”) number, and return to
Seller the defective product along with proof of purchase and
the RMA number.
This warranty does not extend to damage or failure
which results from misuse, neglect, accident, alteration,
abuse, improper installation or maintenance. EXCEPT
AS PROVIDED HEREIN, SENAL MAKES NEITHER ANY
EXPRESS WARRANTIES NOR ANY IMPLIED WARRANTIES,
INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE. This warranty provides you with specific legal
rights, and you may also have additional rights which vary
from state to state.
© Copyright 2013 Gradus Group
All other trademarks are the property of their respective owners.
All photos are for illustrative purposes only.
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Warranty

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