Air Motion Transformer-eng.indd

HOLOGRAPHIC SOUND DEVICES - Air Motion Transformer
AMT 2530 / 2540
150*102*20 mm (l*w*h)
AMT 2830 / 2930
185*116*25 mm (l*w*h)
AMT 2340
AMT 2440
130*102*20 mm
(l*w*h)
With the HOLOGRAPHIC SOUND
DEVICES we introduce you to the
latest product line from our establishment:
Sound transducers of the highest
quality from our own development
and production. Stimulated by and
based on the know-how of more than
20 years of successful development
and manufacture of audiophile components,
we have rethought progressive
and successfully applied concepts
such as the Air Motion Transformer
or magnetostatic transducers and optimised
them step by step.
Based on principle, Air Motion Transformers
boast a much greater distortion-free
dynamic range than other
types of transducers (linear dynamic).
The given nonlinearity in the high frequency
range was fi nally able to be
virtually completely eliminated with
constructive innovations. The result is
an extraordinarily neutral transducer
with considerable dynamic potential.
Of course, the fi nest dynamic nuances
are reproduced, as well as the greatest
dynamic leaps are brilliantly mastered.
For instance, Qualifi ed Engineer Bernd
Timmermanns from the HOBBY HiFi
measuring laboratory also reported
the following about our AMT 2340: “…
with perfect linear sound pressure
frequency response and excellent
decay behaviour… as a result, this
tweeter is one of the most low-distortion
tweeters that Hobby HiFi has
ever examined in the laboratory”
(HH 1/2005, Page 17), and he writes
further about the musical qualities:
“What makes the ‘debut’ so special
is its ability to allow music to fl ow.
This fl ow lives from the fi ne overtones,
from gentle nuances that do not
languish between the major signals,
but stand their ground in an enti-
AMT 2340 AMT 2440 AMT 2530 AMT 2540 AMT 2630 AMT 2640 AMT 2730
Dimension (mm) 130*102*20 150*102*20 200*100*20 276*100*20
Purpose
HiFi / High End
Impedance 3.9 Ohm 3.5 Ohm ~3.5 Ohm ~3.8 Ohm ~3.4 Ohm ~3.4 Ohm 5.5 Ohm
Frequency range (Hz) 2,200-23,000 2,600-30,000 1,300-22,000 1,500-26,000
estimate:
1,200-21,000
estimate:
1,300-26,000 1,000-21,000
Sensitivity (dB)
(1watt/1meter)
90 90 98 98 100 100 100
Power handling 100 Watt 100 Watt 80 Watt 80 Watt 130 Watt 130 Watt 150 Watt
rely unencumbered and matter-offact
manner. …of course, the piano,
with its astoundingly perceptible
outlines also seems to be so close
you can touch it… in particular, live
recordings gain enormously”.
Our Air Motion Transformer (AMT)
series currently consists of fi ve
models: The AMT 2340 and AMT
2440, provided in identical housing,
differ in the used membrane and the
frequency response generated thereby.
Both measurements are given for
comparison. It is also available in the
2530/2540 two membranes.
Succeeding you will see the measurements
.

110
100
90
80
70
60
800 900 1k 2k 3k 4k 5k 6k 7k 8k 9k10k 20k 30k
Hz
Phase
180
dB
90
00
-90
1.8
1.6
1.4
1.2
1.0
[%]
0.8
0.6
0.4
0.2
0.0
1k 2k 3k 4k 5k 6k 7k 8k 9k 10k
signal K2 K3 [Hz]
AMT 2340 - ATB Precision
0
AMT 2340 - SPL 0.1 m / 1 m - 2 Volt
-180
800 900 1k 2k 3k 4k 5k 6k 7k 8k 9k10k 20k 30k
Hz
AMT 2340 - ATB Precision
0.3 0.4 0.5 0.6 0.7 ms 0.8 0.9 1.0 1.1 1.2
0 dB
-50 dB
[db]
-5
-10
-15
AMT 2340 - ATB Waterfal
-20 00 10000
-80
-70
-60
Diagrams of: AMT 2340
4 2
6
8
10
12
14
16
18
20
[Hz]
measuring ���������� equipment ��� �������� � � ���
microphone �������� ��������� ������ �� ���
��������� ������ �� ���
��������� ������ �� ���
rotary ��������� table ������� � �� � � �� �
computer �������� �������� � � ������� � � � ���
Amplifi �������������� er
���� ��� ������
���� �� ��� ��� � � �� ���� � � ���
� � ��� ���� � � ���
The driver ��� ������������ unit was mounted ����� on a ��baffl ����� e 30 ���������� x 30 cm with �� an �additional �� ��
volume. �� The ����� volume ���encloses �� ������ the magnet ������� system � ��� and ���� 15 �������� mm of felt (33 � mm
total depth x 90 mm x 150 mm).
-50
-40
-30
-20
-90
2 0 -2 -4 -6 -8 -10
AMT 2340 - ATB Precision 0.2 m
-10
0
1 kHz
10
-10
20
30
40
-8 -6 -4 -2
Attention: on the scale of 2dB
50
0
60
70
[periods]
80
-80
-90
2 0 -2 -4 -6 -8 -10
-80
-70
-70
-60
-60
-50
-50
-40
-40
-30
-30
-20
-20
-10
-90
2 0 -2 -4 -6 -8 -10
-80
-70
-60
-50
-40
-30
-20
2
90 -90
2 0 -2 -4 -6 -8 -10
AMT 2340 - ATB Precision 0.2 m
-10
5 kHz
0 10
10 kHz
0 10
-10
AMT 2340 - ATB Precision 0.2 m
-10
0
-10
AMT 2340 - ATB Precision 0.2 m
20
20
30
30
40
-8 -6 -4 -2
Attention: on the scale of 2dB
40
-8 -6 -4 -2
Attention: on the scale of 2dB
10
-10
20
30
40
-8 -6 -4 -2
20 kHz Attention: on the scale of 2dB
50
50
50
0
0
0
60
60
60
70
70
80
90
2
80
90
2
70
80
90
2

dB
[%]
120
110
100
90
80
70
-180
800 1k 2k 3k 4k 5k 6k 7k 8k 9k10k 20k 30k 40k
Hz
Distortion AMT 2440 - membrane 20 / 20 µm - 2 Volt - 0.1 m
10.0
0 dB
0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
SPL AMT 2440 - membrane 20 / 20 µm - 2 Volt - 0.1 m & 1 m
800 1k 2k 3k 4k 5k 6k 7k 8k 9k10k 20k 30k 40k
Hz
180
90
00
-90
phase
0.0
900 1k 2k 3k 4k 5k 6k 7k 8k 9k 10k
signal K2 K3 [Hz]
AMT 2440 - ATB Precision
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0
ms
-50 dB
[db]
-5
-10
-15
-20
-25
-30
-80
-90
5
ATB Waterfal AMT 2440 - membrane 20 / 20 µm - 2 Volt - 0.1 m
1000 10000
Diagrams of: AMT 2440
4 2
6
10 8
12
14
16
18
20
[Hz]
The AMT 2440 and the AMT2340 have identical
dimensions, but the AMT 2440 has a strongly expanded
frequency response for higher frequencies.
The lower frequency limit is also somewhat higher.
-70
-60
-50
-40
-30
AMT 2440 - 0.5 m - red = horizontal / blue = vertical
-20
-10
0 -5 -10 -15 -20 -25
0
2.5 kHz
10
-25
20
30
40
-20 -15 -10 -5
50
0
60
[periods]
70
80
-80
-90
5
-80
-70
-90
5
-80
-70
-70
90
5
-90
5
-60
-60
-60
-50
-40
-40
-30
-30
AMT 2440 - 0.5 m - red = horizontal / blue = vertical
Attention: ACHTUNG: on skaliert the scale in Schritten of 5dB von 5 dB
16 kHz Attention: ACHTUNG: on skaliert the scale in Schritten of 5dB von 5 dB
-20
-10
0 -5 -10 -15 -20 -25
-50
-10
0
6,3 kHz
AMT 2440 - 0.5 m - red = horizontal / blue = vertical
-20
0 -5 -10 -15 -20 -25
-50
-40
-30
0
10 kHz
0
10
-25
20
30
40
50
60
ACHTUNG: Attention: on skaliert the scale in Schritten of 5dB
von 5 dB
10
-25
AMT 2440 - 0.5 m - red = horizontal / blue = vertical
-20
-10
0 -5 -10 -15 -20 -25
-20 -15 -10 -5
20
30
40
-20 -15 -10 -5
50
0
60
Attention: ACHTUNG: on skaliert the scale in Schritten of 5dB von 5 dB
10
-25
20
30
40
-20 -15 -10 -5
50
0
0
60
70
70
80
90
5
80
90
5
70
80
90
5

0
110
100
90
80
70
dB 120
800 900 1k 2k 3k 4k 5k 6k 7k 8k 9k 10k 20k 30k
Hz
180
90
00
-90
AMT 2530 - SPL - 2.8 Volt 0.1 m - 1 m
phase
-180
800 900 1k 2k 3k 4k 5k 6k 7k 8k 9k 10k 20k 30k
Hz
-20
00 10000
110
100
90
80
70
dB 120
800 900 1k 2k 3k 4k 5k 6k 7k 8k 9k 10k 20k 30k
Hz
180
90
00
-90
AMT 2540 - SPL - 2.8 Volt 0.1 m - 1 m
phase
-180
800 900 1k 2k 3k 4k 5k 6k 7k 8k 9k 10k 20k 30k
Hz
AMT 2530 - 2.8 Volt 0.1 m / mounted on a baffl e 26 x 120 cm
0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2
ms
[db]
-5
-10
-15
-80
-70
-60
-50
Diagrams of: AMT 2530 and AMT 2540
-40
AMT 2530 - Waterfal - 2.8 Volt 0.1 m / mounted on a baffl e 30 x 30 cm
-30
-10
-90
5 0 -5 -10 -15 -20 -25
AMT 2530 - Polar - red = horizontal / blue = vertical
-20
0
2.5 kHz
10
-25
20
4
[Hz]
2
6
10 8
12
14
16
18
20
30
40
-20 -15 -10 -5
Attention: on the scale of 5 dB
50
0
60
70
[periods]
80
-80
-70
-60
-50
-40
-30
-10
-90
5 0 -5 -10 -15 -20 -25
-80
-70
-60
-40
-30
AMT 2530 - Polar - red = horizontal / blue = vertical
-20
-10
-90
5 0 -5 -10 -15 -20 -25
-80
-70
-60
-50
-50
-40
-30
0
6.3 kHz
0
10
-25
20
30
40
-20 -15 -10 -5
Attention: on the scale of 5 dB
AMT 2530 - Polar - red = horizontal / blue = vertical
-20
-10
90
5 -90
5 0 -5 -10 -15 -20 -25
10
-25
20
30
40
-20 -15 -10 -5
10 kHz Attention: on the scale of 5 dB
AMT 2530 - Polar - red = horizontal / blue = vertical
-20
0
10
-25
20
30
40
-20 -15 -10 -5
16 kHz Attention: on the scale of 5 dB
50
50
50
0
0
0
60
60
60
70
80
90
5
70
70
80
90
5
80
90
5

120
110
100
90
80
dB 130
500 600 700 800 1k 2k 3k 4k 5k 6k 7k 8k 9k 10k 20k 30k
Hz
phase
180
90
00
-90
AMT 2730 - SPL - membrane 25/50 - 2.8 Volt / 0.1 m - 1 m - chassis & baffl e 30 x 30cm
-180
500 600 700 800 1k 2k 3k 4k 5k 6k 7k 8k 9k 10k 20k 30k
Hz
10.0
0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
AMT 2730 - Distorsion - membrane 25/50 - 2.8 volt - chassis & baffl e 30 x 30cm
0.0
1k 2k 3k 4k 5k 6k 7k 8k 9k 10k
signal K2 K3
Hz
AMT 2730 - 2.8 Volt / 0.1 m / chassis & baffl e 30 x 30cm
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0
ms
0 dB
-50dB
[db]
-5
-10
-15
-20
-25
-30
-80
-70
-60
-50
AMT 2730 - Waterfal - membrane 25/50 -2.8 Volt / 0.1 m / chassis & baffl e 30 x 30 cm
1000 10000
-40
-30
-90
5 0 -5 -10 -15 -20 -25
Diagrams of: AMT 2730
AMT 2730 - Polar - red = horizontal / blue = vertical
-20
-10
0
2.0 kHz
10
-25
20
4
[Hz]
2
6
10 8
12
14
16
18
20
30
40
-20 -15 -10 -5
Attention: on the scale of 5 dB
50
0
60
70
[periods]
80
-80
-70
-60
-50
-40
-30
-90
5 0 -5 -10 -15 -20 -25
-80
-70
-60
-50
-40
-30
90 -90
5 5 0 -5 -10 -15 -20 -25
AMT 2530 - Polar - red = horizontal / blue = vertical
-20
-10
-10
-90
5 0 -5 -10 -15 -20 -25
-80
-70
-60
-50
-40
-30
0
6.3 kHz
0
10
-25
20
30
40
-20 -15 -10 -5
Attention: on the scale of 5 dB
AMT 2730 - Polar - red = horizontal / blue = vertical
-20
-10
10
-25
20
30
40
-20 -15 -10 -5
10 kHz Attention: on the scale of 5 dB
AMT 2730 - Polar - red = horizontal / blue = vertical
-20
0
10
-25
20
30
40
-20 -15 -10 -5
16 kHz Attention: on the scale of 5 dB
50
50
50
0
0
0
60
60
60
70
80
90
5
70
70
80
90
5
80
90
5

dB
180
90
00
-90
AMT 2830 - SPL 2 Volt 0.1 m and 1 m / mounted on a baffl e 30 x 30 cm
120
110
100
[db]
90
80
-5
70
500 600 700 800 1k 2k 3k 4k 5k 6k 7k 8k 9k 10k 20k 30k
Hz
-10
phase
-180
500 600 700 800 1k 2k 3k 4k 5k 6k 7k 8k 9k10k 20k 30k
Hz
AMT 2830 - ATB precision
-30
1000 10000
5.0
0 dB
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
800 900 1k 2k 3k 4k 5k 6k 7k 8k 9k 10k
signal K2 K3
Hz
0
AMT 2830 - ATB precision
-50 dB
0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3
ms
1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3
-15
-20
-25
-75
-60
-45
-30
-90
2 0 -2 -4 -6 -8 -10
AMT 2830 - ATB Waterfal
Diagrams of: AMT 2830
The „large“ AMT is offered as AMT 2830 for Hifi applications.
The frequency range goes from approx. 1,200 Hz to 21,000 Hz.
-15
AMT 2830 AMT 2930 AMT 3140
Dimension (mm) 185*116*25
276*116*25
Purpose HiFi / PA
PA
Impedance ~3.4 ohm ~3.4 ohm 4.3 ohm
Frequency range (Hz) 1,200-21,000 1,200-20,000
Sensitivity (dB)
(1watt/1meter)
104 108
Power handling
150 watt
AMT 2830 - ATB precision
0
1 kHz
-10
15
30
45
-8 -6 -4 -2
Attention: on the scale of 2dB
0
60
75
[periods]
-75
-60
4
[Hz]
2
6
10 8 -90
12
2 0 -2 -4 -6 -8 -10
14
16
18
20
estimate:
700-21,000
estimate:
108
-75
-60
-45
-45
-30
-30
-15
-15
-90
2 0 -2 -4 -6 -8 -10
-75
-60
-45
-30
-15
2
90 -90
2 0 -2 -4 -6 -8 -10
AMT 2830 - ATB precision
0
5 kHz
0
10 kHz
16 kHz
-10
AMT 2830 - ATB precision
-10
AMT 2830 - ATB precision
0
-10
15
15
15
30
45
-8 -6 -4 -2
Attention: on the scale of 2dB
30
45
-8 -6 -4 -2
Attention: on the scale of 2dB
30
45
-8 -6 -4 -2
Attention: on the scale of 2dB
0
0
0
60
60
60
75
90
2
75
90
2
75
90
2