Laney CA600 2 Schematic

CA600CA600

Power Amplifer

Service Information

Laney www.laney.co.uk

SystemDiagram

CA Series Power Amplifiers

Traditionally, Class A and Class A-B amplifiers have dominated the amplifier marketplace. These purely analogue
devices have low power efficiency and most integrated circuit Class A-B amplifiers fall short of true high-fidelity audio
quality.
Class D amplifiers however, solve the efficiency problem by using switching pulse-width modulation technology.
However, this produces audio quality that is far inferior to class A or AB, so efficiency is gained at the expense of audio
fidelity. The ‘Holy Grail’ of amplification: High audio quality AND high power efficiency has long eluded the market.
Enter the CA range of power amplifiers delivering audiophile performance and very high efficiency.

If you have measured the output waveforms of CA amplifiers using traditional equipment
and methods, you may have observed an unusual characteristic in the output waveform
when the amplifier is driven close its maximum output. This characteristic appears to be a
high frequency oscillation near the waveform peaks.
In reality, this apparent oscillation is an audio quality enhancement characteristic of the
CA amplifier. The apparent oscillations are well outside the audio bandwidth, and are a
unique feature of the digital power processor.

As the input signal, to any conventional amplifier is increased, at some point the output of the amplifier will distort/clip
i.e. ‘Square’ off. This is bad news because the for a split second the loudspeaker is not moving at all but still dissipating
potentially huge power levels, this is the main cause of (expensive) compression driver failure.
When the CA power amplifier goes into this distortion region, it exhibits high frequency break-up of the peaks as shown
above. This is actually the amplifier resetting the control processor overloads at a frequency far above the audible range.
This is not instability or oscillation, nor does it degrade the performance of the amplifier in any way. In addition the CA
series power amplifiers also have the ability to run almost rail-to-rail, and thus will not lose negative feedback. In other
words, it will retain control of the load at all times.

No Filtering on output

Measurement of THD%+N

Unless your distortion analyser is designed to reject out of band noise when measuring THD (And very few are), the THD
measurement actually reflects harmonic distortion plus any noise present up to the bandwidth of the analyser and so is
actually a measurement of THD+N. Since the CA range of amplifiers have energy far outside the audible frequency
range (As do inferior class D amplifiers), a test designed for linear amplifiers (such as class A, AB) will not yield valid
results when applied to a CA amplifier. A sharp cut-off low-pass filter must be inserted between the amplifiers outputs
and the test equipment’s inputs prior to making any distortion measurements. Some measurement equipment (Such as
Audio Precision2) have high quality low pass filters which can be used to limit the test bandwidth. Using these filters (as
shown below) you will achieve what ‘looks’ like a high quality linear amplifier. Even though there appears to be ‘lots
going on’ outside the audio bandwidth, the CA amplifier is designed to be well within current and future EMC guidelines,
and as such is quieter than most linear amplifiers.

Output with 30Khz Low-pass filter

D:\RST\MISC\CA Series Ampifers THD measurement.doc
Created by R&D3 On 07/11/00 Page 1/1

CA600E

CA600 EURO/UK 230V

SPECIAL MAINS LEAD

1

CA SERIES MANUAL

1

10462 CA600/1500 CARTONS 1
10702
10959

Page 1/6

CA600E

CA600 EURO/UK 230V

CA600 CHASSIS ASSY EURO/UK

-1

10M .25W RESISTOR

1

680NF 250V 22.9mm

3

3A FILTERED MAINS INLET

1

3MM SOLDER TAG

1

5MM SOLDER TAG

10

M3*8 METAL SPACER

2

M3*20 PLASTIC SPACER HEX

4

RED P402 KNOB

2

3*5mm PAN POZI

4

4mm INT. SHAKEPROOF

26

4*12mm PAN POZI

2

4*8 PAN POZI TAPTE

4

M5 INT SHAKEPROOF

2

5mm BRASS HEX NUT

1

WASHER 10MM O/D X 3 1/2MM ID

2

3 WAY IDC CONNECTOR

8

NO 6*3/8 FLANGE POZI

18

4mm NUTSERT

18

4 X 3/8 PAN POZI AB BLK POZI

6

DPST EQ MAINS SWITCH

1

EARTH WARNING LABEL

1

1/4" LG RECEPTACLE

17

POZI LOCK NYLON BOOT

16

4*10mm SMALL F/H

8

M8 * 60 ROOFING BOLT

1

POP RIVET (BLACK)

6

S/A SQUARE RUBBER FOOT20MMx8MM

4

MX500 CAP STRAP

-1

CA600 SUB FACIA DWG 3137

-1

CA1500/600 CHASSIS DWG 3104

-1

CA1500/600 REAR DWG 3105

-1

CA1500/600 LID DWG 3145

-1

CA600 MAINS TX 115/230

-1

7908

->001048

->002022 10000UF 100V CAPACITOR/ SAMWHA 2

->002204

->005319

->005321 3A THERMAL RELEASE SWITCH 1

->005510

->005511

->005558 100mm TIE WRAP 20

->005612

->005632

->005659 SHORT BOARD SPACER 12.7MM 4

->005666

->009152

->009160 4mm HEX NUT 19

->009161

->009162

->009163 4*20mm PAN POZI 6

->009167

->009171

->009173 5*12mm PAN POZI 1

->009181

->009183

->009190 6 WAY END CONNECTOR 4

->009199

->009200

->009204 NO 4*1/4 PLASTITE 4

->009217

->009235

->522032 35A BRIDGE RECTIFIER 1

->530027

->540038

->541004 HC25/50 4.8 FASTON 6

->541053

->541071

->582005 4*25 PAN POZI 4

->582007

->586002

->586023 8mm SHKPRF WASHER 1

->588006

->589020

->589041 50mm CAPACITOR CLAMP 2

->5P-50036

->8P-5066

->8P-5064 CA1500/600 TRIM FACIA DWG NO 3126 -1

->8P-5065

->8P-9250

->8P-5067 CA1500/600C CHASSIS PARTITION DWG -1

->8P-5069

->->8T-6144

Page 2/6

CA600E

CA600 EURO/UK 230V

CA SERIES INPUT PCB 9339 ASSY

-1

22K 1206 1% RESISTOR

2

ORO SHORTING LINK

17

1K 5% RESISTOR

2

56KSM 1206 1% RESISTOR

2

10KSM 1206 1% RESISTOR

12

100NF 63V 5mm

6

47PF 50V 10% COG

2

3mm LED YELLOW

2

5MM FERRITE BEAD

4

MC33078 IC

3

7815 IC VOLT'REGULATOR

1

10K HORIZ PRESET

2

STEREO JACK SOCKET

2

6 WAY LOCKING HEADER

2

XLR SOCKET FEMALE

2

3 WAY NON LOCKING

2

LEDS-02-12-26 SPACER

1

3 WAY IDC CONNECTOR

1

PCB ISSUE 2

1

SHORTING LINK (IDC)

2

->007909

->->001071

->->001072 39K 1206 1% RESISTOR 2

->->001300

->->001327

->->001920 ZERO OHM RESISTOR 2

->->001923

->->001924

->->002013 10UF 50V CAPACITOR 6

->->002419

->->002602

->->002605 470PF 50V 10% COG 2

->->003034

->->003041

->->003500 BAS16 DIODE 12

->->003509

->->003901

->->003902 7915 IC VOLT'REGULATOR 1

->->004019

->->005003

->->005030 HEATSINK TV5 2

->->005036

->->005054

->->005063 3 WAY LOCKING HEADER 4

->->005065

->->005331

->->005610 2 POLE 2 WAY (MX) 1

->->009199

->->009339

->->530023 4P 3W SLIDE SWITCH 1

->->543508

Page 3/6

CA600E

CA600 EURO/UK 230V

CA600 OUTPUT ASSY PCB 9333

-1

5R6 1W 5% WW RESISTOR

4

33R 2W5 5% RESISTOR

2

ORO SHORTING LINK

2

2K2 5% RESISTOR

1

10K 5% RESISTOR

11

4K7 5% RESISTOR

4

47K 5% RESISTOR

3

6K8 5% RESISTOR

1

1K 5% RESISTOR

2

1K 2.5W RESISTOR

2

680R 5W RESISTOR

1

47UF 50V RADIAL

4

1000UF 25V RADIAL

3

100UF 35V RADIAL

1

1UF 63V RADIAL

3

100N 100V 5MM BOX POLY

6

100UF 100V RADIAL CAP

2

100N 250V 5MM POLYESTER CAPACITOR

2

100NF 400V 15MM

2

47PF 500V CERAMIC

2

1N4007 DIODE

6

15V 1.3W ZENER

1

1.5A 200V BRIDGE

1

3mm GREEN LED

2

5MM FERRITE BEAD

5

MPSA42/43 TRANSISTOR

2

TA0104A TRIPATH DIGITAL AMPLIFIER

2

STW34NB20 MOSFET

4

BAS16 DIODE

7

BC857B TRANSISTOR

1

34072 IC (SMD TL072)

1

7815 IC VOLT'REGULATOR

1

7915 IC VOLT'REGULATOR

1

10K HORIZ PRESET

2

HEATSINK TV5

3

1/4" SPADE TERMINAL

7

3 WAY LOCKING HEADER

3

0.9A POLY SWITCH/MF-R090

3

8W PCB SOCKET

2

12W PCB SOCKET

2

ALUMINIUM OXIDE FET WASHER

4

->007910

->->001068

->->001069 OR01 2W5 5% WIREWOUND RESISTOR 4

->->001073

->->001300

->->001302 47R 5% RESISTOR 1

->->001305

->->001306

->->001309 1M 5% RESISTOR 4

->->001312

->->001315

->->001316 22K 5% RESISTOR 2

->->001318

->->001327

->->001400 10K 1W RESISTOR 1

->->001511

->->001705

->->001920 ZERO OHM RESISTOR 1

->->002004

->->002009

->->002013 10UF 50V CAPACITOR 1

->->002014

->->002025

->->002029 220UF 25V CAPACITOR 1

->->002035

->->002036

->->002039 220N 250V POLYPROPYLENE CAP 2

->->002041

->->002410

->->002419 100NF 63V 5mm 8

->->002818

->->003000

->->003007 3V9 .5W ZENER DIODE 2

->->003014

->->003017

->->003018 10V .5W ZENER DIODE 1

->->003022

->->003041

->->003042 BYW100-200-FAST RECOVERY DIODE 4

->->003411

->->003423

->->003424 LM7812 12V REGULATOR 1

->->003425

->->003500

->->003503 BC847B TRANSISTOR 3

->->003504

->->003508

->->003610 TIP31C TRANSISTOR 2

->->003901

->->003902

->->003905 7805 IC 1

->->004019

->->005030

->->005036 6 WAY LOCKING HEADER 1

->->005038

->->005063

->->005076 290MM TIE WRAP 1

->->005103

->->005316

->->005317 11.3UH 20A INDUCTOR 2

->->005318

->->005322

Page 4/6

CA600E

CA600 EURO/UK 230V

30A RELAY

2

4.8MM TERMINAL SPADE

6

3mm INT SHAKEPROOF

7

CA/B1 DIGITAL OUTPUT PCB

1

3*20mm PAN POZI

7

POP RIVET (BLACK)

3

CA/B1 OUTPUT TRAY DWG NO 3130

-1

->->005558 100mm TIE WRAP 2

->->005609

->->005686

->->009150 3mm HEX NUT 7

->->009151

->->009333

->->543508 SHORTING LINK (IDC) 2

->->581018

->->588006

->->588058 M3*10mm HEX TAPPED 5

->->8P-9243

Page 5/6

CA600E

CA600 EURO/UK 230V

CA600 VU/SS/O/P ASSY

-1

1K .25W RESISTOR

1

2K2 5% RESISTOR

2

10K 5% RESISTOR

3

1K 5% RESISTOR

4

10UF 50V CAPACITOR

2

220NF 250V 15MM DIPPED POLYSTER

2

5V1 .5W ZENER DIODE

1

SURGE GUARD SCK20-10-8A

1

3mm LED RED

4

LB1413 BARGRAPH DRIVER

2

10K VERTICAL PRESET

2

3 WAY 90 DEGREE LOCKING HEADER

4

8 WAY 90 DEGREE LOCKING HEADER

1

PCB ISSUE 3

1

SHORTING LINK (IDC)

2

->007911

->->001003

->->001300 ORO SHORTING LINK 1

->->001305

->->001306

->->001311 470R 5% RESISTOR 2

->->001327

->->002013

->->002401 22NF 400V 10MM 2

->->002402

->->003011

->->003022 3mm GREEN LED 7

->->003031

->->003033

->->003503 BC847B TRANSISTOR 1

->->003805

->->004113

->->004110 B10K 27.5MM POT 2

->->005072

->->005073

->->005657 LED SPACER 12.7mm 2

->->009335

->->543508

->->571014 10 TURN CHOKE 2

Page 6/6

CA600US

CA600 115V

SPECIAL MAINS LEAD

1

CA SERIES MANUAL

1

10462 CA600/1500 CARTONS 1
10702
10959
7917 CA600 CHASSIS ASSY 115V -1

Page 1/4

CA600US

CA600 115V

CA600 CHASSIS ASSY 115V

-1

10M .25W RESISTOR

1

680NF 250V 22.9mm

3

6 AMP FILTERED MAINS INLET

1

3MM SOLDER TAG

1

5MM SOLDER TAG

10

M3*8 METAL SPACER

2

M3*20 PLASTIC SPACER HEX

4

RED P402 KNOB

2

3*5mm PAN POZI

4

4mm INT. SHAKEPROOF

26

4*12mm PAN POZI

2

4*8 PAN POZI TAPTE

4

M5 INT SHAKEPROOF

2

5mm BRASS HEX NUT

1

WASHER 10MM O/D X 3 1/2MM ID

2

3 WAY IDC CONNECTOR

8

NO 6*3/8 FLANGE POZI

18

4mm NUTSERT

18

4 X 3/8 PAN POZI AB BLK POZI

6

DPST EQ MAINS SWITCH

1

EARTH WARNING LABEL

1

1/4" LG RECEPTACLE

17

POZI LOCK NYLON BOOT

16

4*10mm SMALL F/H

8

M8 * 60 ROOFING BOLT

1

POP RIVET (BLACK)

6

S/A SQUARE RUBBER FOOT20MMx8MM

4

MX500 CAP STRAP

-1

CA600 SUB FACIA DWG 3137

-1

CA1500/600 CHASSIS DWG 3104

-1

CA1500/600 REAR DWG 3105

-1

CA1500/600 LID DWG 3145

-1

CA600 115V MAINS TX

-1

7917

->001048

->002022 10000UF 100V CAPACITOR/ SAMWHA 2

->002204

->005323

->005324 5A THERMAL RELEASE SWITCH 1

->005510

->005511

->005558 100mm TIE WRAP 20

->005612

->005632

->005659 SHORT BOARD SPACER 12.7MM 4

->005666

->009152

->009160 4mm HEX NUT 19

->009161

->009162

->009163 4*20mm PAN POZI 6

->009167

->009171

->009173 5*12mm PAN POZI 1

->009181

->009183

->009190 6 WAY END CONNECTOR 4

->009199

->009200

->009204 NO 4*1/4 PLASTITE 4

->009217

->009235

->522032 35A BRIDGE RECTIFIER 1

->530027

->540038

->541004 HC25/50 4.8 FASTON 6

->541053

->541071

->582005 4*25 PAN POZI 4

->582007

->586002

->586023 8mm SHKPRF WASHER 1

->588006

->589020

->589041 50mm CAPACITOR CLAMP 2

->5P-50036

->8P-5066

->8P-5064 CA1500/600 TRIM FACIA DWG NO 3126 -1

->8P-5065

->8P-9250

->8P-5067 CA1500/600C CHASSIS PARTITION -1

->8P-5069

->->8T-6145

Page 2/4

CA600US

CA600 115V

CA SERIES INPUT PCB 9339 ASSY

-1

22K 1206 1% RESISTOR

2

ORO SHORTING LINK

17

1K 5% RESISTOR

2

56KSM 1206 1% RESISTOR

2

10KSM 1206 1% RESISTOR

12

100NF 63V 5mm

6

47PF 50V 10% COG

2

3mm LED YELLOW

2

5MM FERRITE BEAD

4

MC33078 IC

3

7815 IC VOLT'REGULATOR

1

10K HORIZ PRESET

2

STEREO JACK SOCKET

2

6 WAY LOCKING HEADER

2

XLR SOCKET FEMALE

2

3 WAY NON LOCKING

2

LEDS-02-12-26 SPACER

1

3 WAY IDC CONNECTOR

1

PCB ISSUE 2

1

SHORTING LINK (IDC)

2

->007909

->->001071

->->001072 39K 1206 1% RESISTOR 2

->->001300

->->001327

->->001920 ZERO OHM RESISTOR 2

->->001923

->->001924

->->002013 10UF 50V CAPACITOR 6

->->002419

->->002602

->->002605 470PF 50V 10% COG 2

->->003034

->->003041

->->003500 BAS16 DIODE 12

->->003509

->->003901

->->003902 7915 IC VOLT'REGULATOR 1

->->004019

->->005003

->->005030 HEATSINK TV5 2

->->005036

->->005054

->->005063 3 WAY LOCKING HEADER 4

->->005065

->->005331

->->005610 2 POLE 2 WAY (MX) 1

->->009199

->->009339

->->530023 4P 3W SLIDE SWITCH 1

->->543508

Page 3/4

CA600US

CA600 115V

CA600 VU/SS/O/P ASSY

-1

1K .25W RESISTOR

1

2K2 5% RESISTOR

2

10K 5% RESISTOR

3

1K 5% RESISTOR

4

10UF 50V CAPACITOR

2

220NF 250V 15MM DIPPED POLYSTER

2

5V1 .5W ZENER DIODE

1

SURGE GUARD SCK20-10-8A

1

3mm LED RED

4

LB1413 BARGRAPH DRIVER

2

10K VERTICAL PRESET

2

3 WAY 90 DEGREE LOCKING HEADER

4

8 WAY 90 DEGREE LOCKING HEADER

1

PCB ISSUE 3

1

SHORTING LINK (IDC)

2

->007911

->->001003

->->001300 ORO SHORTING LINK 1

->->001305

->->001306

->->001311 470R 5% RESISTOR 2

->->001327

->->002013

->->002401 22NF 400V 10MM 2

->->002402

->->003011

->->003022 3mm GREEN LED 7

->->003031

->->003033

->->003503 BC847B TRANSISTOR 1

->->003805

->->004113

->->004110 B10K 27.5MM POT 2

->->005072

->->005073

->->005657 LED SPACER 12.7mm 2

->->009335

->->543508

->->571014 10 TURN CHOKE 2

Page 4/4