AMPLIFIER MODULES

PURIFI 1ET7040SA.png
icepower1200as2

A class D amplifier is not a digital amplifier but a switching amplifier. The class D amplifier converts the analog signal (input) into a PWM waveform. The PWM modulator is not an ADC converter (as many think) but a frequency modulator that creates a sort of pulse train corresponding to the amplitude and frequency of the input signal. This process appears digital but this is analog. The signal is not "digitized", assigned to a numerical value; the PWM pulse train is an "analog" version of the input audio signal. The PWM waveform drives the push-pull MOSFET output stage fully on or off for each pulse. When one of the MOSFETs is on, the current flowing through it is high, but the voltage is very low, so the power is dissipated only during the short transitions between the on and off state. Similarly, when the MOSFET is off, the voltage across it is high, but the current is nearly zero. There is no power dissipation except in the on / off state transitions. The amplified PWM waveform, before being transferred to the speakers, is subjected to low-pass filtering to recover the audio waveform and to eliminate spurious ultrasonic noise.

 

class d amp asw.png

Converting the analog waveform to a PWM waveform is done by applying the analog waveform to one input of a comparator, while a triangular waveform is applied to the other input. The pulse width varies according to the width of the input signal.

Class D amplifiers were first made in the 1950s. Why have they only recently gained more widespread popularity? The answer involves several factors. Until the 1980s, there were no switching transistors that met the performance needs of Class D amplifiers, and it was only in the mid 1990s that Class D ICs became available. switching frequency of 250 kHz or higher. During the 1990s, the combination of dedicated integrated circuits and continuous improvements in silicon-based power MOSFETs contributed to an acceleration in the adoption of Class D in high-end audio systems.

The choice of the amplifier board is the first step for realize a custom power amplifier. To this end you will need to consider the following factors:
1) the load impedance of the speakers that you want to drive, expressed in Ohms;
2) the power that you need, espressed in watts;
3) the impedance of the input signal, expressed in Ohms;

For the less experienced, our staff is always available for any kind of advice in this regard. Requests may be made by mail at no additional cost.

POWER RATING LIST
BRAND
MODEL
P.R. 2Ω
P.R. 4Ω
P.R. 8Ω
MAX CURRENT
ICEPOWER
400A2
-
2x400W
2x200W
20A
ICEPOWER
300A2
-
2x300W
2x150W
20A
ICEPOWER
300AS1
-
300W
150W
20A
ICEPOWER
2000AS1
-
2000W
1400W
38A
ICEPOWER
2000AS2
-
2x1000W
2x1000W
38A
ICEPOWER
700AS1
-
700W
350W
30A
ICEPOWER
700AS2
-
2x550W
2x370W
30A
ICEPOWER
1200AS2
-
2x700W
2x600W
38A
ICEPOWER
1200AS1
-
1200W
600W
38A
POWERSOFT
LITEMOD 4HV
2x2000W (PTL)
2x2000W (PTL/BTL)
2x2000W (BTL)
100A
POWERSOFT
LITEMOD 4HC
2x1400W (PTL)
2x750W
2x1400W (BTL)
30A
POWERSOFT
LITEMOD HV
-
n.d.
2x700W
31A
POWERSOFT
LITEMOD LV
-
2x600W
2x400W
31A
PASCAL
L-PRO2S
2x900W
2x800W
2x400W
40A
PASCAL
M-PRO2
-
2x800W
2x400W
21A
PASCAL
S-PRO2
2x725W
2x490W
2x245W
30A
PURIFI
1ET7040SA
950W
500W
250W
40A
PURIFI
1ET400A
450W
450W
227W
25A
HYPEX
NC500MP
400W
500W
250W
27A
HYPEX
NC502MP
2x450W
2x500W
2x350W
27A
HYPEX
NC252MP
2x180W
2x250W
2x200W
17,5A
HYPEX
NC250MP
180W
250W
130W
17,5A
HYPEX
NC122MP
2x115W
2x125W
2x75W
12,5A
HYPEX
NC2K
2000W
2500W
1600W
48A
HYPEX
NC1200
1200W
700W
400W
40A
HYPEX
NCx500
700W
700W
380W
28A
HYPEX
NC500
550W
700W
400W
28A
DATASHEET  SPECS
BRAND
MODEL
Zload min.
Dynamic range
THD+N
SNR
Frequency Response
CMRR
Output noise
ICEPOWER
400A2
3,5Ω
121,5dB
0.001% @ 100Hz, 10W, 4 Ω
n.d.
20Hz-70kHz
n.d.
35µV
ICEPOWER
300A2
3,5Ω
123,5dB
0.0008% @ 100Hz, 10 W, 4Ω
n.d.
20Hz-70kHz
n.d.
25µV
ICEPOWER
300AS1
2,5Ω
113dB
0,006% @ 100Hz, 1W, 4Ω
n.d.
20Hz-70kHz
n.d.
75µV
ICEPOWER
2000AS1
127,5dB
0,001% @ 1kHz, 10W, 4Ω
n.d.
3hz-40Khz
n.d.
38µV
ICEPOWER
2000AS2
127,5dB
0,001% @ 1kHz, 10 W, 4Ω
n.d.
3hz-40Khz
n.d.
38µV
ICEPOWER
700AS1
2,5Ω
117dB
0.005% @ 1kHz, 1W, 4Ω
n.d.
1,5hz-40Khz
n.d.
70µV
ICEPOWER
700AS2
2,5Ω
117dB
0.005% @ 1kHz, 1W, 4Ω
n.d.
1,5hz-40Khz
n.d.
70µV
ICEPOWER
1200AS2
2,7Ω
127dB
0,003% @ 1kHz, 10W, 4Ω
135dB
3hz-50Khz
n.d.
30µV
ICEPOWER
1200AS1
2,7Ω
127dB
0,003% @ 1kHz, 10W, 4Ω
135dB
3hz-50Khz
n.d.
30µV
POWERSOFT
LITEMOD 4HV
n.d.
<0.08% from 1 W to 1/2 full power
117dB
10Hz – 30kHz
n.d.
n.d.
POWERSOFT
LITEMOD 4HC
n.d.
< 0.05% from 1 W to 1/2 full power
115dB
10 Hz - 30 kHz
n.d.
n.d.
POWERSOFT
LITEMOD HV
n.d.
< 0.08% from 1 W to full power
119dB
20Hz - 33kHz
n.d.
n.d.
POWERSOFT
LITEMOD LV
3,5Ω
n.d.
< 0.08% from 1 W to full power
115dB
20Hz - 33kHz
n.d.
n.d.
PASCAL
L-PRO2S
2,7Ω
120dB
0.0028% @ 1kHz, 1W, 8Ω
n.d.
20Hz – 20kHz
n.d.
54µV
PASCAL
M-PRO2
120dB
0.003% @ 1kHz, 1W, 8Ω
n.d.
20Hz – 20kHz
n.d.
55µV
PASCAL
S-PRO2
2,7Ω
120dB
0.003% @ 1kHz, 1W, 8Ω
n.d.
20Hz – 20kHz
n.d.
40µV
PURIFI
1ET7040SA
129dB
<0.00035% @ 200W, 4Ω, 1kHz
129dB
0-60kHz
>60dB
14µV
PURIFI
1ET400A
131dB
<0.00017% @ 100W, 4Ω, 20-20kHz
131dB
0-60kHz
>60dB
11.5μV
HYPEX
NC500MP
n.d.
0,0020% (20Hz<f<20kHz, 4Ω. Pout<PR/2)
124dB
10hz-50Khz
71dB
40µV
HYPEX
NC502MP
n.d.
0,0018% (20Hz<f<20kHz, 4Ω. Pout<PR/2)
124dB
10hz-50Khz
63dB
40µV
HYPEX
NC252MP
n.d.
0,0015% (20Hz<f<20kHz, 4Ω. Pout<PR/2)
121dB
10hz-50Khz
71dB
30µV
HYPEX
NC250MP
n.d.
0,0015% (20Hz<f<20kHz, 4Ω. Pout<PR/2)
121dB
10hz-50Khz
71dB
30µV
HYPEX
NC122MP
n.d.
0,0015% (20Hz<f<20kHz, 4Ω. Pout<PR/2)
121dB
10hz-50Khz
71dB
30µV
HYPEX
NC2K
n.d.
0,002% (20Hz<f<20kHz, 4Ω. Pout<PR/2)
133dB
0-50Khz
55dB
18µV
HYPEX
NC1200
n.d.
0,004% (20Hz<f<20kHz, 4Ω. Pout<PR/2)
128dB
0-50Khz
65dB
20µV
HYPEX
NCx500
n.d.
0,0006% (20Hz<f<20kHz, 4Ω. Pout<PR/2)
136dB
0-75Khz
65dB
7µV
HYPEX
NC500
n.d.
0,001% (20Hz<f<20kHz, 4Ω. Pout<PR/2)
135dB
0-50Khz
65dB
10µV