AUDAC AXIR Istruzioni per l'installazione e il funzionamento
PROFESSIONALAUDIO EQUIPMENT
AXIR Design Column speaker
User Manual &
Installation Guide
AXIR
DesignColumnSpeaker
AUDAC
AUDAC PROFESSIONAL AUDIO EQUIPMENT
User Manual & Installation Guide
AUDAC
http://www.audac.eu
1
INTRODUCTION .....................................................................................................................................................................................................................2
SAFETY REQUIREMENTS....................................................................................................................................................................................................3
WARNING - CAUTION.......................................................................................................................................................................................................3
INSTALLATION.......................................................................................................................................................................................................................4
DETERMINING LISTENING AREA AND MOUNTING HEIGHT.................................................................................................................................4
OTHER POINT TO PAY ATTENTION TO ......................................................................................................................................................................7
CREATE SPECIFIC POLAR PATTERNS .........................................................................................................................................................................8
CONNECTING THE AXIR.....................................................................................................................................................................................................9
CONNECTIONS...................................................................................................................................................................................................................9
LINE TRANSFORMER POWER TAPS............................................................................................................................................................................10
CONVERT FOR USE IN LOW IMPEDANCE APPLICATIONS ...................................................................................................................................11
ADDITIONAL INFORMATION AXIR...............................................................................................................................................................................12
TECHNICAL SPECIFICATIONS......................................................................................................................................................................................12
POLAR PATTERNS...........................................................................................................................................................................................................13
PERSONAL NOTES...............................................................................................................................................................................................................14
Index
2
Introduction
This introduction briefly describes the possibilities of the AXIR design column
speaker..
he AXIR was designed to meet professional demands en proves its worth in
auditoria, conference rooms, meeting rooms, churches,… any place that requires a
great flexibility in positioning and tuning, ass well as state-of-the-art audio quality
and design.
Key features:
-High-quality 2 inch speakers, especially designed by AUDAC, make the AXIR suitable
for music and speech.
-4 selectable output power taps for 100V operation mode.
-Ultra lightweight design and strong aluminum housing.
-Especially designed metal wall brackets included
-Two separate power tap selectors for upper and lower speaker units allow you to create a
specific polar pattern. It can accommodate virtually any acoustic situation.
T
3
Warning
Only use the correct amplifier output voltage and impedance, exceeding
these limits could cause damage, fire or other failures.
Only install the speaker on surfaces that can accommodate the weight
of the speaker and the mounting bracket.
Don’t use any other mounting method than specified.
Attach a safety wire to the speaker when it’s mounted high up. This ensures
that the speaker can’t fall down in any case.
Avoid mounting the speaker in locations exposed to constant vibrations.
The mounting bracket can be damaged by excessive vibration, potentially
causing the speaker to fall down.
Caution
Avoid electric shocks: turn off the amplifier when connecting the
speaker.
Don’t operate the speaker for an extended period of time at distorted
sound. This can cause irreparable damage to the speaker.
Don’t stand or sit on it, nor hang down from the speaker as this may cause
it to fall down or drop.
Chapte
r
1
4
Installation
To achieve the best possible intelligibility and sound quality with a column speaker,
there has to be paid extra attention to the proper mounting of the speaker.
The dimensions of the desired listening area has to be determined where out the
correct mounting height and angle can be derived.
A step by step installation procedure describes the method to determine the mounting
height and angle for the AXIR.
DETERMINING LISTENING AREA AND MOUNTING HEIGHT
STEP 1:
Determine the dimensions of the desired Listening Area. This is a horizontal plane at the
level of the listeners ears. Refer to the dashed line in following figure.
Chapte
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2
5
STEP 2:
After the listening area, determine at which angle the loudspeaker array has to be
mounted. The AXIR column speaker was designed to aim the sound just above the
heads of the listeners, and it is recommended not to exceed an angle of 6°. There are
two different approaches to determine the mounting angle, each with specific
advantages and disadvantages. Which approach you choose, depends on what you want
to achieve: a maximum listening area or a minimal variation in sound pressure level.
- Approach 1: Maximum listening area
When a large listening area is desired, an angle of around 3° is recommended. When
you move away from the loudspeaker, the sound pressure level will be decreased. This
decrease depends on the reverberation of the room in which the speaker is placed.
If you want the high tones to be clearly audible, make sure the listener is able to see the
loudspeaker array.
- Approach 2: Minimal variation in sound pressure level
When a minimal variation in sound pressure level is desired, an angle of 5° is ideal for
this purpose. The size of the total listening area becomes in comparison with the
previous approach, smaller. The space nearby the loudspeaker ‘A’ does not belong to
the listening area.
(Diagram 1 shows the relationship between ‘A’ and the mounting height of the
loudspeaker when using an angle of 5°)
6
0 32,521,510,5
80
60
40
20
0
100
(cm)
(m)
Height X between listening area and speaker
Distance A between speaker and listening area
7
STEP 3:
When you’ve chosen one of the above approaches to determine your mounting angle,
you proceed by determining the mounting height. This height is determined by aiming the
0° axis of the AXIR in the desired position, precisely above the ear level of the listener
who’s the furthest away from the speaker. This can be adjusted by mounting the
loudspeaker higher and lower on the wall.
STEP 4:
When you’ve determined the mounting angle and height, you can start installing the
speaker.
OTHER POINTS TO PAY ATTENTION TO:
While mounting a column speaker, there are still some other points where has to be
paid attention to.
- Make sure that the loudspeaker array is always visible for everyone in the listening
area, to ensure a good audibility of the high tones. High tones can be compared with
light. When something is between the observer and the light source, the observer can’t
see the light source at it’s full power, this is what we call shadow.
For high tones, this is the same issue. When someone is standing between the listener
and the loudspeaker, the listener is located in the sound shadow. The sound shadow
will be experienced as a reduction of high tones.
- When the loudspeaker is installed at a very small angle, a large listening area can be
reached. Depending on the amount of reverberation in the room and the sound
shadow, the speech intelligibility on a far position may be low. In this situation, it is
recommended to use more loudspeaker arrays to split the listening area.
- When you move further than the maximum position of the listening area (further
than the maximum distance of the loudspeaker array), only the sound pressure level will
decrease. There will be almost no tone height variation. The decreasing factor of the
sound pressure level depends strongly on the reverberation of the room.
- When you are located too close to the loudspeaker array (closer than the minimum
distance) a decline of the high tones will occur very soon.
- Because the loudspeakers are designed to beam the sound just above the listeners
ears, it’s better to mount the speakers not to high above the listening area.
- When you want to determine where exactly the edges of the listening area are located
in your situation, you have to do a practical test at this location. This is a job for an
experienced listener with well-trained ears. Put pink noise through the loudspeaker
array, and reduce the lower tones for this test because they do not contribute to speech
intelligibility. Walk around in the listening area and pay attention to the high tones. The
places where the high tones decrease rapidly are the edges of the listening area.
8
CREATE SPECIFIC POLAR PATTERNS
The AXIR contains two individual speaker sections whose power can be individually
set between 20W, 10W, 5W and 2.5W. The desired power taps can be selected by a
recessed adjuster screw behind the speakers cover.
This allows us to set the total speaker power between 5W and 40W, but it also gives
the possibility to create a specific polar pattern.
By adjusting the upper and lower power taps independent from each other, the sound
transfer length can be adapted to each specific situation.
Following figure shows an example of a situation where by means of the two individual
power tap selectors a specific polar pattern can be realized. The lower speaker section
is set to a lower power than the upper speaker section. By correct focusing of the
speaker the sound transfer length of the speaker can be adapted to each specific
situation.
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