Audio U-PRO1, U-PRO2 User Manual

U-PRO1&2 Amplifier Module

Data Sheet

U-PRO1

Content of t

Amplifier Module

his data sheet is subject to change without prior notice

2 Amplifier Modu

U-PRO

le

Table of Contents

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1



Features and description ................................................................................................................. 3

2



General specifications ...................................................................................................................... 4

2.1Audio specifications ..................................................................................................................... 4

2.2Input & output loading ................................................................................................................. 5

2.3Audio input/output interfacing ..................................................................................................... 5

2.4AC Mains & thermal specification ................................................................................................. 6

2.5Auxiliary power supply specification ............................................................................................ 7

3



Audio measurements ....................................................................................................................... 8

3.1Frequency response Ch1 (LF) ....................................................................................................... 8

3.2Frequency response Ch2 (HF) ...................................................................................................... 8

3.3Total Harmonic Distortion + Noise (THD+N) Ch1 (LF) .................................................................. 9

3.4Burst power Ch1 (LF) .................................................................................................................... 9

3.5Total Harmonic Distortion + Noise (THD+N) Ch2 (HF) ............................................................... 10

3.6Noise spectrum .......................................................................................................................... 10

3.7Intermodulation Distortion (CCIF, TIM) Ch1(LF) .......................................................................... 11

3.8Intermodulation Distortion (CCIF, TIM) CH2(HF) ......................................................................... 11

3.9Cross talk & output resistance ................................................................................................... 12

3.10Output voltage vs. frequency ..................................................................................................... 12

4



Control and readout specification .................................................................................................. 13

4.1Control pins ................................................................................................................................ 13

4.2Readout pins .............................................................................................................................. 14

5



Protection features ........................................................................................................................ 15

5.1U-PRO functional blocks ............................................................................................................. 16

5.2Single Ended (SE) 2 channel amplifier ........................................................................................ 17

5.3Single Ended (SE) 1 channel amplifier ........................................................................................ 17

6



U-PRO1 and U-PRO2 connections ................................................................................................... 18

6.1Mains Power connector .............................................................................................................. 19

6.2Signal and Control connector ..................................................................................................... 19

6.3Speaker Output connector ......................................................................................................... 20

6.4DC-Supply connector .................................................................................................................. 20

7



Mechanical specifications .............................................................................................................. 21

8



Regulatory compliance .................................................................................................................. 23

8.1Safety compliance ...................................................................................................................... 23

8.2Electro Magnetic Compliance ..................................................................................................... 23

8.3ESD precautions ......................................................................................................................... 24

8.4Changes ..................................................................................................................................... 24

8.5CE marking ................................................................................................................................. 24

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U-PRO1&2_Data_Sheet-1_1 Page 2 of 24

1 Features and description

Features

 1 x 280W (U-PRO1) or 1 x 280W + 1 x 100W

SE (U-PRO2) amplifier channel(s) using
Pascal’s UMAC
sonic performance.

 Universal mains regulated power supply with

PFC using Pascal’s UREC
technology

 Auxiliary power supply for external circuitry

like DSP Front End solutions

 ErP (1275/2008/EC) & Energy Star compliant

standby consumption of < 0.5W

 Wake on Music ready with selectable timing
 Full protection scheme
 Ultra-compact size
 Unmatched total system efficiency
 Multiple readouts (temperature, amplifier

output voltage, clip monitor, amplifier
protect/mute, VAC)

 Safety approved and verified for EMC

compliance

TM

technology for unmatched

TM

power supply

Product summary

Parameter Typical Value

Total Output power
(1% THD+N, 1kHz @ 4/8)

Total system efficiency
(SE, 250 W @ 8)

Peak output current
(CH1)
(CH2)
THD+N
(1kHz @ 1W)
Dynamic range 119 dB(A)
Idle noise 49 V(A)
Output resistance
(1kHz)
Mains input voltage 85VAC – 265VAC
Standby consumption 0.23 W

280W + 100W

88 %

25 A
10 A

0.003 %

22.5 m

Description

The U-PRO1/2 modules are 1 or 2 channel Class-D
amplifiers with integrated universal mains power
supply with PFC.

The U-PRO2 is an asymmetric 2 channel amplifier
with a high-power channel intended for LF/MF
drivers and a low-power channel intended for HF
drivers.

The U-PRO1/2 offers an ultra-compact size with an
unmatched total system efficiency to ease the
integration of the U-PRO modules into any audio
solution.

In addition, the U-PRO1/2 modules offer a number
of readouts and controls, which allow for external
DSP control of the modules. The built-in auxiliary
power supply makes it easy to supply a DSP Front
End.

Typical applications

 Professional Audio Solutions
 Self-Powered Loudspeakers
 Consumer Audio Solutions
 Hi-Fi Audio Solutions
 Installation Systems

U-PRO1&2_Data_Sheet-1_1 Page 3 of 24

2 General specifications

2.1 Audio specifications

Electrical Characteristics @ Ta = 25°C (unless otherwise specified)

Symbol Parameter Conditions Min Typ Max Unit

V

Peak output voltage Ch1 & Ch2 Unloaded - ± 70 - V

out,max

I

out,peak_Ch1(LF)

I

out,peak_Ch2(HF)

P

Total module output power1

o,tot

Po

Po

Po

Po

THD+N THD+N @ 1W, 1kHz, RL = 82 0.003 %

V

noise Ch1(LF)

V

noise Ch2(HF)

DR

Ch1(LF)

DR

Ch2(HF)

A Voltage gain @ 1kHz, Ch1 & Ch2 SE - 26 - dB

A

var_Ch1(LF)

A

var_Ch2(HF)

BWup

BWup

BW

low

R

o_Ch1(LF)

R

o_Ch2(HF)

V

out,offset

IMD

CCIF_Ch1(LF)

IMD

TIM_Ch1(LF)

IMD

CCIF_Ch2(HF)

IMD

TIM_Ch2(HF)

Table 2-1: Audio specifications

Peak output current - 25 - A

Peak output current - 10 - A

280
250
245
245
280
250
175
175
110
110

66
49
66

49
117
119
117
119

0.3

0.1

0.3

0.3

0.2

0.1
85
65

100

85
65

22.5
256

35

245

- W

- W

- W

- W

- W

- V

- V

RMS

RMS

- dB

- dB

- dB

- dB

- kHz

- kHz

- m

- m

Output power @ 1% THD+N, 1kHz
Ch1(LF), single channel driven R
Output power @ 1% THD+N, 1kHz2
Ch1(LF), single channel driven RL=4
Output power @ 1% THD+N, 1kHz
Ch2(HF), single channel driven R
Output power @ 1% THD+N, 1kHz2
Ch2(HF), single channel driven R

Output idle noise - Ch1(LF)

Output idle noise – Ch2(HF)

Dynamic Range - Ch1(LF)

Dynamic Range – Ch2(HF)

Frequency response variance
Ch1(LF) @ 20Hz – 20kHz

Frequency response variance
Ch2(HF) @ 20Hz – 20kHz

Upper bandwidth @ -3dB
Ch1(LF)

Upper bandwidth @ -3dB
Ch2(HF)

Lower bandwidth @ -3dB
Ch1 & Ch2

Output resistance3

Output resistance3

2

=8

L

2

=8

L

=4

L

230VAC
120V

AC

230V
120V

AC

AC

230VAC
120VAC
230V
120V
230V
120V

AC

AC

AC

AC

Unweighted
A-weighted
Unweighted
A-weighted
Unweighted
A-weighted
Unweighted
A-weighted

-

-

-

-

-

-

-

-

-

Open Load
8

­4
Open Load
16

­8
RL = 8

= 4

R

L

R

= 16

L

= 8

R

L

= 4

R

L

-

-

All loads - 1.6 - Hz

1 kHz
20 kHz
1 kHz
20 kHz

-

-

Amplifier output DC Offset Ch1 or Ch2 8 - ±7 - mV

Intermodulation distortion (CCIF),
Ch1(LF)

Transient Intermodulation distortion
(TIM), Ch1(LF)

Intermodulation distortion (CCIF),
Ch2(HF)

Transient Intermodulation distortion
(TIM), Ch2(HF)

18kHz &
19kHz

- 0.006 - %
Po = 10W, 8

Po = 10W, 8 - 0.003 - %

18kHz &
19kHz

- 0.0046 - %
Po = 10W, 8

Po = 10W, 8 - 0.0028 - %

Note 1: Maximum total power is limited by the power supply.
Note 2: Measured using the Audio Precision AES-17 filter.
Note 3: Measured using “APx Output Impedance Utility” at the mating part of the output connector, thereby including contact
resistance of the connectors.

U-PRO1&2_Data_Sheet-1_1 Page 4 of 24

2.2 Input & output loading

Electrical Characteristics @ Ta = 25°C (unless otherwise specified)

Symbol Parameter Conditions Min Typ Max Unit

Z

Input impedance

INPUT

Z

L,Ch1(LF)

Z

L,Ch2(HF)

Z

L,BTL

Z

L,C

Loudspeaker nominal impedance range
Ch1(LF) Single Ended (SE)
Loudspeaker nominal impedance range
Ch2(HF) Single Ended (SE)
Loudspeaker nominal impedance range
Ch1 – Ch2 Bridge Tied Load (BTL)*
Maximum purely capacitive loading of
amplifier output

Balanced
Unbalanced

-

Ch1(LF) 41 8  

Ch2(HF) 4

1

Ch1 – Ch2 * * * 

- - 1 F

7.2

3.6

- k

8  

Table 2-2: Input and output loading

Note 1: U-PRO is fully protected for ZL < ZL Min. Connection of loads < ZL Min is not recommended as a low load impedance in
combination with the amplifier current limit will limit maxim output power.

* Using the U-PRO2 Amplifier module in BTL mode (Bridge Tied Load) is not allowed, as the two output channels have asymmetrical
power ratings, and current limits.

2.3 Audio input/output interfacing

Electrical Characteristics @ Ta = 25°C (unless otherwise specified)

Symbol Parameter Value Unit

In+

max

In-

Absolute maximum audio input voltage ±20 Vp

max

In+
In-

Absolute maximum audio input voltage ±20 Vp

Audio input voltage (In+) – (In-)
voltage swing

for full output

max

1

V

±3.5

p

Table 2-3: Audio input voltage rating

Note 1: Internal input stage is supplied from an internal ±5V.

U-PRO1&2_Data_Sheet-1_1 Page 5 of 24

2.4 AC Mains & thermal specification

Electrical Characteristics @ Ta = 25°C (unless otherwise specified)
When values differ between U-PRO1 and U-PRO2, U-PRO2 data is added in parentheses.

Symbol Parameter Conditions Min Typ Max Unit

VAC Range Operational voltage range 45Hz - 65Hz 85 - 265 VAC

P

120VAC NS

P

230VAC NS

P

120VAC NS

P

230VAC NS

P

AC_PN

P

AC_PN

P

AC_PN

P

AC_PN

P

AC_PN

P

AC_PN

P

Loss

P

Loss

P

Loss

P

Loss

P

Loss

P

Loss

Mains power input
No signal applied
Pascal U-PRO I/O-board attached
Mains power input
No signal applied
Pascal U-PRO I/O-board attached

Mains power input
No signal applied

Mains power input
No signal applied

Mains power input 230V
U-PRO1. Pink Noise

= 1/8th 250W for RL = 8

P

out,RMS

= 1/8th 280W for RL = 4

P

out,RMS

Mains power input 120V
U-PRO1. Pink Noise

= 1/8th 250W for RL = 8

P

out,RMS

= 1/8th 250W for RL = 4

P

out,RMS

AC

AC

Mains power input 100VAC
U-PRO1. Pink Noise

= 1/8th 250W for RL = 8

P

out,RMS

P

= 1/8th 250W for RL = 4

out,RMS

Mains power input 230V

, U-PRO2,

AC

Pink Noise, Load Ch1: 4 / Ch2: 16 
P
P
Mains power input 120V

ch1 = 1/8th 224W @ 4

out,RMS

ch2= 1/8th 56W @16

out,RMS

, U-PRO2,

AC

Pink Noise, Load Ch1: 4 / Ch2: 16 
P
P
Mains power input 100V

ch1 = 1/8th 200W @ 4

out,RMS

ch2= 1/8th 50W @16

out,RMS

, U-PRO2,

AC

Pink Noise, Load Ch1: 4 / Ch2: 16 
P
P
Module power loss at 230V

ch1 = 1/8th 200W @ 4

out,RMS

ch2= 1/8th 50W @16

out,RMS

AC

U-PRO1. Pink Noise

= 1/8th 250W for RL = 8

P

out,RMS

= 1/8th 280W for RL = 4

P

out,RMS

Module power loss at 120V

AC

U-PRO1. Pink Noise

= 1/8th 250W for RL = 8

P

out,RMS

P

= 1/8th 280W for RL = 4

out,RMS

Module power loss at 100V

AC

U-PRO1. Pink Noise

= 1/8th 250W for RL = 8

P

out,RMS

= 1/8th 280W for RL = 4

P

out,RMS

Mains power input U-PRO2, Pink
Noise, Load Ch1: 4 / Ch2: 16 
P

= 1/8th 200W for RL = 4

out,RMS

= 1/8th 50W for RL = 16

P

out,RMS

Mains power input U-PRO2, Pink
Noise, Load Ch1: 4 / Ch2: 16 
P

= 1/8th 200W for RL = 4

out,RMS

= 1/8th 50W for RL = 16

P

out,RMS

Mains power input U-PRO2, Pink
Noise, Load Ch1: 4 / Ch2: 16 

= 1/8th 200W for RL = 4

P

out,RMS

P

= 1/8th 50W for RL = 16

out,RMS

Standby
Mute

­Idle
Standby
Mute

­Idle
Standby
Mute

­Idle
Standby
Mute

­Idle

R

= 8

L

RL = 4

= 8

R

L

= 4

R

L

R

= 8

L

= 4

R

L

230V

- 67 - W

AC

120V

- 68 - W

AC

100V

- 68 - W

AC

R

= 8

L

= 4

R

L

R

= 8

L

= 4

R

L

R

= 8

L

RL = 4

230V

17 W

AC

120V

15 W

AC

100V

15 W

AC

-

-

-

-

0.37

3.8 (4.4)

4.4 (6.1)

0.45

4.1 (4.5)

4.9 (6.8)

0.17

2.4 (2.9)

3.6 (5.3)

0.24

2.6 (3.0)

4.1 (5.9)

44
50

43
46

43
46

11
15

10
13

10
13

W

W

W

RMS

RMS

RMS

RMS

RMS

RMS

RMS

RMS

RMS

RMS

RMS

RMS

RMS

RMS

RMS

RMS

-

-

-

- W

- W

- W

- W

- W

W

W

U-PRO1&2_Data_Sheet-1_1 Page 6 of 24



tot,8



tot,4

PF8

PF4

TSD

System efficiency @ 1 x 8 Ch1(LF)
U-PRO1, (1x250W

@ 1kHz)

out

System efficiency @ 1 x 4 Ch1(LF)
U-PRO1, (1x250W

@ 1kHz)

out

Power Factor @ 1 x 8 Ch1(LF) U­PRO1, (1x100W

@ 1kHz)

out

Power Factor @ 1 x 4 Ch1(LF) U­PRO1, (1x100W

@ 1kHz)

out

Temperature @ thermal shutdown
Thermal hysteresis = 5°C1

230VAC
120VAC
230V

AC

120V

AC

230VAC
120VAC
230V

AC

120V

AC

-

-

-

-

88
84
84
82

0.92

0.97

0.92

0.97

- %

- %

-

-

- 85 - °C

Table 2-4: AC Mains & thermal specifications

Note 1: 5°C but minimum 10s.

2.5 Auxiliary power supply specification

Electrical Characteristics @ Ta = 25°C (unless otherwise specified)

Symbol Parameter Conditions Min Typ Max Unit

V

+7.5V voltage

+7.5V

V

+15V voltage 15.5 V

+15V

V

-15V voltage -15.5 V

-15V

V

Drive

I

+7.5V current rating2 0 800 mA

+7.5V

I

+15V current rating2 0 250 mA

+15V

I

-15V current rating2 -250 0 mA

-15V

I

V

VDrive

P

Maximum total output power2 0 9 W

tot

Vdrive voltage Ref. to -70V 12.4 V

current rating2 0 200 mA

Drive

Table 2-5: Auxiliary power supply specification

7.7 V

Note 1: For details see U-PRO Application Manual covering Powered Speaker
Note 2: The Auxiliary power supply cannot be loaded with the maximum rated load current for all four outputs simultaneously as this
will violate the 9 Watt total output power limit. Use the typical Voltage levels from Table 2-5 in combination with the actual load
currents to calculate the total power consumption. The calculated total power consumption must comply with the 9 Watt total output
power limit.

U-PRO1&2_Data_Sheet-1_1 Page 7 of 24

3 Audio measurements

3.1 Frequency response Ch1 (LF)

+32

+30.8

+29.6

+28.4

+27.2

d
B

+26

g

A

+24.8

+23.6

+22.4

+21.2

+20

20 100k 50 100 200 500 1k 2k 5k 10k 20k 50k

Hz

Figure 3-1: Frequency response (Top curves: Amplitude, Bottom curves: Phase)

4 (green), 8 (red) and Open Load (blue)

+180

+160

+140

+120

+100

+80

+60

+40

+20

+0

-20

-40

-60

-80

d
e
g

3.2 Frequency response Ch2 (HF)

+32

+30.8

+29.6

+28.4

+27.2

d
B

+26

g

A

+24.8

+23.6

+22.4

+21.2

+20

20 100k 50 100 200 500 1k 2k 5k 10k 20k 50k

Hz

Figure 3-2: Frequency response (op curves: Amplitude, Bottom curves: Phase)

4 (green), 8 (red) and Open Load (blue)

+180

+160

+140

+120

+100

+80

+60

+40

+20

+0

-20

-40

-60

-80

d
e
g

U-PRO1&2_Data_Sheet-1_1 Page 8 of 24