Laney B1-2-3 Series Schematic

B

Series

Service Manual

B1
b2
b3

Laney www.laney.co.uk

To Internal / Hi SocketTo Internal / Hi Socket

2+

1-

2-

1+

-

+

Warning This equipment must be earthed.Warning This equipment must be earthed.

Power Consumption

Power Consumption

~50-60Hz

750Watts ~50-60Hz

750Watts

Supply VoltageSupply Voltage

115V

~~115V

~

230V

230V

~

CAUTION

RISK OF ELECTRIC SHOCK - DO NOT OPENRISK OF ELECTRIC SHOCK - DO NOT OPEN

Made inthe United Kingdom byBLT Industries Ltd.

Toreduce the riskof electric shock donot remove covers.

Toreduce the riskof electric shock donot remove covers.

No userserviceable parts inside. Referservicing to

No userserviceable parts inside. Referservicing to

2+

2-

Serial No:-Serial No:-

Avis

Avis

Risque dechoc electrique - ne pasouvrir.

Risque dechoc electrique - ne pasouvrir.

Caution

Caution

qualified personnelonly.

qualified personnelonly.

Attention.

Attention.

Debrancher lecordon d’alimentation

Debrancher lecordon d’alimentation

avant touteintervention.

avant touteintervention.

Warning

Warning

Toreduce the riskof fire or electricshock do not

Toreduce the riskof fire or electricshock do not

expose thisappliance to rain ormoisture.

expose thisappliance to rain ormoisture.

Caution

Caution

Refer to users manual for recommended

Refer

to users manual for recommended

speaker connections.

speaker

connections.

1-

1+

+

Speakon - BLT Part Nos 10682Speakon - BLT Par t Nos 10682

Cable UCable U

Bi-Amp/Hi

k

k

Min Load

Min Load

c

c

o

o

2 Ohms

2

Ohms

L

L

k

k

c

c

o

o

l

l

n

n

U

U

Push ToResetPushTo Reset

Internal/Hi

!

Sub/LoSub/Lo

k

k

c

c

o

o

L

L

k

k

c

c

o

o

l

l

n

n

U

U

Min Load

Min Load

2 Ohms

2

Ohms

Bi-Amp/Lo

2+

2-

1+

To Sub / Lo SocketTo Sub / Lo Socket

15 inch Loudspeaker

15 inch Loudspeaker

Nos . 41522

Part Nos . 41522

Par t

(B3

(B3 only)

+

only)

Active CrossoverActive Crossover

-+0-+0

1 1

2

3

4 4

5

Amp ModeAmp Mode

Internal+Sub

Internal Only

Internal Only

5

Level

Hi

Lo

Footswitch

Bi-amp

Pre-Amp

Pre-Amp

AuxInAux

2

Out

Out

In

3

B2 and B3 Cabinet Wiring Details

Effects

Effects

Loop

Loop

Send

0dB

-10dB
Bypass

Return

Pre EqPre Eq

Direct

Direct

Inject

Inject

Post EqPost Eq

PAD

1-

Cable QCable Q

+

-

+

-

+

-

Drawing number 3189

Drawing number 3189

Issue 1

Issue

by RJF

Drawn

Drawn by RJF

Date

Date 05/12/00

Updated

Updated

1

05/12/00

B2/B3 Combo

B2/B3 Combo

Details

Wiring Details

Wiring

On

+

2 off 10 inch Loudspeakers

2 off 10 inch Loudspeakers

Nos . 41026

Part Nos . 41026

Par t

+ B3))

(B2

(B2 + B3))

-

Fostex HornFostex Horn

View from Rear of Speaker Plate (unprinted face)

Shows switch orientation

B Series Bass 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 B range of Bass Amplifiers delivering audiophile performance and very high efficiency.

If you have measured the output waveforms of B Series Bass 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
B series 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 B Series Bass 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 B Series Bass 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 loudspeaker 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 B Series 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 B Series 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 B 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\B Series Ampifiers THD measurement.doc
Created by R&D3 On 08/12/00 Page 1/1

10702

SPECIAL MAINS LEAD

1

B1 USER MANUAL

1

B1 CABINET ASSY

-1

B1 CHASSIS ASSY EURO/UK

-1

10M .25W RESISTOR

1

22K 1W RESISTOR

2

10000UF 100V CAPACITOR/SAMWHA

2

680NF 250V 22.9mm

3

3MM BLUE DIFFUSED LED

6

M3*20 PLASTIC SPACER HEX

2

CHASSIS MOUNT MAINS FILTER

1

3A FILTERED MAINS INLET

1

3A THERMAL RELEASE SWITCH

1

7.5mm ROUND BLACK

4

3MM SOLDER TAG

1

5MM SOLDER TAG

11

6mm SOLDER TAG

2

LARGE GRIPPACLIP

2

ECC83 VALVE

1

100mm TIE WRAP

20

10 WAY (T) CONNECTOR

3

NOB P670-90F SPLINE

1

SHORT BOARD SPACER 12.7MM

14

DB SERIES LARGE KNOB/30MM

1

RBG CHROME KNOB 18mm

8

18MM KNURLED KNOB

8

3mm HEX NUT

4

3mm INT SHAKEPROOF

4

3*12mm Z/B PAN POZI

4

4mm HEX NUT

13

4mm INT. SHAKEPROOF

19

4*20mm PAN POZI

5

4*25 CSK BLACK POZI

2

4*8 PAN POZI TAPTE

12

5*12mm PAN POZI

1

5mm BRASS HEX NUT

1

5mm CAGE NUT

4

6 WAY END CONNECTOR

4

3 WAY IDC CONNECTOR

2

NO 6*3/8 FLANGE POZI

6

NO 4*1/4 PLASTITE

22

4mm NUTSERT

8

35A BRIDGE RECTIFIER

1

DPST EQ MAINS SWITCH

2

SPEAKON SOCKET

3

EARTH WARNING LABEL

1

HC25/50 4.8 FASTON

18

1/4" LG RECEPTACLE

17

POZI LOCK NYLON BOOT

12

4*10mm SMALL F/H

18

M8 * 60 COACH BOLT

1

8mm SHKPRF WASHER

1

POP RIVET (BLACK)

6

50mm CAPACITOR CLAMP

2

MX500 CAP STRAP

-1

B1 FACIA DWG NO 3057

-1

B1 REAR DWG NO 3135

-1

B1 CHASSIS DWG NO 3107

-1

B1 HEATSINK EXTR DWG NO 3148

-2

B1 MAINS TX + CRIMPS

-1

B1 MAINS 115/230 TX

-1

B1 PREAMP ASSY PCB 9331

-1

27KSM 1206 1% RESISTOR

1

100K .5W 1% RESISTOR

2

ORO SHORTING LINK

47

100R 5% RESISTOR

1

2K2 5% RESISTOR

20

10K 5% RESISTOR

38

68K 5% RESISTOR

2

1M 5% RESISTOR

2

100K 5% RESISTOR

17

470R 5% RESISTOR

10

4K7 5% RESISTOR

4

8K2 5% RESISTOR

2

47K 5% RESISTOR

2

10958
20480
7904 B1 CHASSIS ASSY 1

7904

->001048

->001401

->002022

->002204

->003043

->005632

->005320

->005319

->005321

->005503

->005510

->005511

->005512

->005536

->005548

->005558

->005574

->005625

->005659

->005660

->005664

->005664/CP

->009150

->009151

->009154

->009160

->009161

->009163

->009166

->009167

->009173

->009181

->009189

->009190

->009199

->009200

->009204

->009217

->522032

->530027

->530066

->540038

->541004

->541053

->541071

->582007

->586003

->586023

->588006

->589041

->5P-50036

->8P-9244

->8P-9245

->8P-9246

->8P-9248

->8T-6142A

->->8T-6142

->007905

->->001046

->->001207

->->001300

->->001303

->->001305

->->001306

->->001308

->->001309

->->001310

->->001311

->->001312

->->001314

->->001315

Page 1/5

->->001316

22K 5% RESISTOR

11

3K3 5% RESISTOR

4

1K 5% RESISTOR

7

330R 5% RESISTOR

4

220K 5% RESISTOR

5

330K 5% RESISTOR

2

150K 5% RESISTOR

1

470K 5% RESISTOR

2

10K 5W RESISTOR

2

ZERO OHM RESISTOR

26

47UF 50V RADIAL

3

10UF 50V CAPACITOR

11

10uf 400V RADIAL

3

2.2UF 63V RADIAL

2

1UF 63V RADIAL

2

4.7UF 63V RADIAL

1

220N 5MM BOX POLY CAPACITOR 63V

6

330N 5MM BOX POLY CAPACITOR 63V

1

100NF 400V 15MM

2

4.7NF 100V 5mm

1

100NF 63V 5mm

24

22NF 100V 5mm

2

47NF 100V 5mm

9

15NF 100V 5mm

1

33N 100V 5MM

1

47PF 50V 10% COG

11

100PF 50V 10% COG

2

470PF 50V 10% COG

1

4N7 1000V CERAMIC

4

1N4007 DIODE

4

3V9 .5W ZENER DIODE

2

5V1 .5W ZENER DIODE

1

10V .5W ZENER DIODE

4

3mm GREEN LED

1

3mm LED RED

2

5MM FERRITE BEAD

3

3MM BLUE DIFFUSED LED

13

BAS16 DIODE

13

BC847B TRANSISTOR

5

TMPF3820 TRANSISTOR

8

34072 IC (SMD TL072)

15

LB1413 BARGRAPH DRIVER

2

7815 IC VOLT'REGULATOR

1

7915 IC VOLT'REGULATOR

1

CD4069UBE IC

1

0-9/9V PCB MOUNT TRANSFORMER

1

1K HORIZ PRESET

1

470K HORIZ PRESET

1

10K HORIZ PRESET

2

A100K 27.5mm POT

2

A10K 27.5mm POT

2

B10K DUAL 27.5MM POT

1

B10K 27.5MM POT

4

B10K ILLUMINATED SLIDER

6

HEATSINK TV5

2

90o 10 WAY HEADER

1

6W 90o LOCKING HEADER

1

3 WAY 90 DEGREE LOCKING HEADER

1

0.9A POLY SWITCH/MF-R090

1

8.5mm VERTICAL PUSH SWITCH

4

6.3MM PHONE JACK

3

B9A VALVE BASE

1

LED SPACER 12.7mm

16

4.8MM TERMINAL SPADE

4

B1 PREAMP ISSUE 6

1

SSM2018P VOLT'CONTROL AMP'

1

HC25/50 4.8 FASTON

2

POP RIVET (BLACK)

2

B1 EFFECTS LOOP ASSY PCB 9332

-1

ORO SHORTING LINK

12

10R 5% RESISTOR

4

47R 5% RESISTOR

2

100R 5% RESISTOR

2

10K 5% RESISTOR

20

100K 5% RESISTOR

3

22K 5% RESISTOR

1

3K3 5% RESISTOR

1

->->001326

->->001327

->->001329

->->001330

->->001332

->->001334

->->001336

->->001714

->->001920

->->002004

->->002013

->->002015

->->002024

->->002025

->->002027

->->002037

->->002038

->->002410

->->002417

->->002419

->->002420

->->002425

->->002426

->->002428

->->002602

->->002603

->->002605

->->002804

->->003000

->->003007

->->003011

->->003018

->->003022

->->003033

->->003041

->->003043

->->003500

->->003503

->->003506

->->003508

->->003805

->->003901

->->003902

->->003910

->->003932

->->004000

->->004016

->->004019

->->004103

->->004104

->->004109

->->004110

->->004112

->->005030

->->005035

->->005062

->->005072

->->005103

->->005304

->->005309

->->005579

->->005657

->->005686

->->009331

->->521010

->->541004

->->588006

->007907

->->001300

->->001301

->->001302

->->001303

->->001306

->->001310

->->001316

->->001326

Page 2/5

->->001327

1K 5% RESISTOR

2

330R 5% RESISTOR

2

33K 5% RESISTOR

4

150K 5% RESISTOR

4

47UF 50V RADIAL

6

10UF 50V CAPACITOR

7

22NF 400V 10MM

2

220NF 250V 15MM DIPPED POLYSTER

2

100NF 63V 5mm

6

10NF 100V 5mm

4

100PF 50V 10% COG

3

470PF 50V 10% COG

2

SURGE GUARD SCK\20-10-8A

1

5MM FERRITE BEAD

12

BAS16 DIODE

2

34072 IC (SMD TL072)

5

4mm 10K LIN POT

1

5 WAY DIN SOCKET

1

SLIM JACK SOCKET-S1BNB

6

90o 10 WAY HEADER

2

6 WAY LOCKING HEADER

2

16A 24V RELAY

1

2 POLE 2 WAY (MX)

1

XLR SKT MALE 90DEG

1

4.8MM TERMINAL SPADE

4

B1 FX LOOP PCB ARRAY

1

4P 3W SLIDE SWITCH

2

10 TURN CHOKE

2

B1/CA OUTPUT ASSY PCB 9333

-1

5R6 1W 5% WW RESISTOR

4

OR01 2W5 5% WIREWOUND RESISTOR

4

18KSM 1206 1% RESISTOR

2

33R 2W5 5% RESISTOR

2

ORO SHORTING LINK

2

47R 5% RESISTOR

1

2K2 5% RESISTOR

1

10K 5% RESISTOR

11

1M 5% RESISTOR

4

4K7 5% RESISTOR

4

47K 5% RESISTOR

3

6K8 5% RESISTOR

1

1K 5% RESISTOR

2

10K 1W RESISTOR

1

1K 2.5W RESISTOR

2

680R 5W RESISTOR

1

ZERO OHM RESISTOR

1

47UF 50V RADIAL

4

1000UF 25V RADIAL

3

10UF 50V CAPACITOR

1

100UF 35V RADIAL

1

1UF 63V RADIAL

3

220UF 25V CAPACITOR

1

100N 100V 5MM BOX POLY

6

100UF 100V RADIAL CAP

2

220N 250V POLYPROPYLENE CAP

2

100N 250V 5MM POLYESTER CAPACITOR

2

100NF 400V 15MM

2

100NF 63V 5mm

8

47PF 500V CERAMIC

2

1N4007 DIODE

6

3V9 .5W ZENER DIODE

2

15V 1.3W ZENER

1

1.5A 200V BRIDGE

1

10V .5W ZENER DIODE

1

3mm GREEN LED

2

5MM FERRITE BEAD

5

BYW100-200-FAST RECOVERY DIODE

4

MPSA42/43 TRANSISTOR

2

STW38NB20 N CHANNEL MOSFET T0247

4

TA0104A TRIPATH DIGITAL AMPLIFIER

2

LM7812 12V REGULATOR

1

BAS16 DIODE

7

BC847B TRANSISTOR

3

BC857B TRANSISTOR

1

34072 IC (SMD TL072)

1

TIP31C TRANSISTOR

2

7815 IC VOLT'REGULATOR

1

->->001329

->->001331

->->001334

->->002004

->->002013

->->002401

->->002402

->->002419

->->002421

->->002603

->->002605

->->003031

->->003041

->->003500

->->003508

->->004082

->->005016

->->005032

->->005035

->->005036

->->005047

->->005610

->->005624

->->005686

->->009332

->->530023

->->571014

->007906

->->001068

->->001069

->->001070

->->001073

->->001300

->->001302

->->001305

->->001306

->->001309

->->001312

->->001315

->->001318

->->001327

->->001400

->->001511

->->001705

->->001920

->->002004

->->002009

->->002013

->->002014

->->002025

->->002029

->->002035

->->002036

->->002039

->->002041

->->002410

->->002419

->->002818

->->003000

->->003007

->->003014

->->003017

->->003018

->->003022

->->003041

->->003042

->->003411

->->003422

->->003423

->->003424

->->003500

->->003503

->->003504

->->003508

->->003610

->->003901

Page 3/5

->->003902

7915 IC VOLT'REGULATOR

1

7805 IC

1

10K HORIZ PRESET

2

HEATSINK TV5

3

6 WAY LOCKING HEADER

1

1/4" SPADE TERMINAL

7

3 WAY LOCKING HEADER

3

290MM TIE WRAP

1

0.9A POLY SWITCH/MF-R090

3

8W PCB SOCKET

2

11.3UH 20A INDUCTOR

2

12W PCB SOCKET

2

ALUMINIUM OXIDE FET WASHER

4

100mm TIE WRAP

2

30A RELAY

2

4.8MM TERMINAL SPADE

6

3mm HEX NUT

7

3mm INT SHAKEPROOF

7

CA/B1 DIGITAL OUTPUT PCB

1

SHORTING LINK (IDC)

2

3*20mm PAN POZI

7

POP RIVET (BLACK)

3

M3*10mm HEX TAPPED

5

CA/B1 OUTPUT TRAY DWG NO 3130

-1

CA1500/600/B1 FET CLAMPING BAR

2

->->003905

->->004019

->->005030

->->005036

->->005038

->->005063

->->005076

->->005103

->->005316

->->005317

->->005318

->->005322

->->005558

->->005609

->->005686

->->009150

->->009151

->->009333

->->543508

->->581018

->->588006

->->588058

->->8P-9243

->->8P-5071

B2 CABINET

005560 SPST MINI ROCKER 2.000
008645 DB X'VER PCB 1.000
10039 CORNER C1839K 6.000
10044 C1823K CORNER 2.000
10057 SMALL LANEY BADGE 1.000
10059 RUBBER CABINET FOOT 8.000
10116 CASTOR 2.000
10117 RUBBER CUP 4.000
10118 BOTTOM HANDLE 1.000
10120 SIDE HANDLE RECESS 2.000
10200 M5 x 10mm TEENUT 8.000
10204 5mm X 25mm PAN POZI 20.000
10224 35mm FINISHED NAILS 40.000
10231 No8x1/2" FLANGE POZI 26.000
10232 NO10x1 1/2 FLANGE HD 6.000
10233 M5*30 FLANGE POZI BK 4.000
10240 10 * 1 CSK POZI 4.000
10241 NO8x1 1/4"FLANGE 4.000
10243 NO4*1/2 TYPE B CSK 2.000
10244 FLAT SPIRE CLIP 2.000
10247 NO8*1/2 FLANGE POZI 4.000
10256 8*1 FLANGE POZI 4.000
10312 15mm PLYWOOD 0.450
10314 18mm MDF 0.100
10326 BLACK CARPET 2.000
10502 DB FOSTEX HORN 1.000
10600 32/18 STAPLES 12.000
10622 POLY BAG 48(0) X 48 1.000
10680 GROMET 1.000
10681 SPEAKER CABLE 0.480
10682 NL2 SPEAKON 1.000
10804 CARTON B210/TE700 1.000
41026 10" LOUDSPEAKER 2.000
541004 HC25/50 4.8 FASTON 4.000
541051 1/4" SML RECEPTACLE 18.000
582007 4*10mm SMALL F/H 6.000
80050 B2 CHASSIS(USE B1) 1.000
8G-B2 GRILL 1.000
8P-5034 B2/B3 SIDE WING 2.000
8P-5083 SPEAKER PLATE 1.000
8P-8502 CABINET VENT PLATE 1.000
8P-8857 BLACK CR VENT 1.000

Page 4/5

B3 CABINET

8

4

1

2

2

12

3

16

4

0.1

0.35

12

1

0.02

1

1

8

-2

005560 SPST MINI ROCKER 2.000
008645 DB X'VER PCB 1.000
10039 PENN CORNER C1839K 6.000
10044 C1823K CORNER 2.000
10057 SMALL LANEY BADGE 1.000
10059 RUBBER CABINET FOOT 8.000
10109 DB115 PORT HOLE 2.000
10116 CASTOR 2.000
10120 SIDE INSERT HANDLE 2.000
10200 M5 x 10mm TEENUT 36.000
10204 5mm X 25mm PAN POZI 36.000
10224 35mm FINISHED NAILS 40.000
10231 No8x1/2" FLANGE POZI 26.000
10232 NO10x1 1/2 FLANGE HD 4.000
10233 M5*30 FLANGE POZI BK 4.000
10240 10 * 1 CSK POZI 4.000
10243 NO4*1/2 TYPE B CSK 2.000
10244 FLAT SPIRE CLIP 2.000
10247 NO8*1/2 FLANGE POZI 4.000
10312 15mm PLYWOOD 1.000
10314 18mm MDF 0.200
10326 BLACK CARPET 2.500
10502 DB FOSTEX HORN 1.000
10600 32/18 STAPLES 20.000
10622 POLY BAG 48(0) X 48 1.000
10680 GROMET 2.000
10681 CABLE 1.500
10682 NL2 SPEAKON 2.000
10804X carton 1.000
41026 10" LOUDSPEAKER 2.000
41522 CS115 LOUDSPEAKER 1.000
541004 HC25/50 4.8 FASTON 2.000
541051 1/4" SML RECEPTACLE 20.000
582007 4*10mm SMALL F/H 6.000
80050 B2 CHASSIS(USE B1) 1.000
8G-B3 GRILL 1.000
8P-5034 WING 2.000
8P-5084 SPEAKER PLATE 1.000
8P-8502 CABINET VENT PLATE 1.000
8P-8857 BLACK CR VENT 1.000

B1CAB

10039 PENN C1839K
10055 PLASTIC CABINET FOOT
10100 STRAP HANDLE
10200 M5 x 10mm TEENUT
10202 5mm X 25mm CSK POZI
10224 35mm FINISHED NAILS
10225 STAPLES 97/12
10234 No 8 X 3/4 CSK POZI
10250 M5*45 FLANGE
10301 18mm CHIPBOARD
10326 BLACK CARPET
10600 32/18 STAPLES
10621 POLY. BAG 30(0) X 36
10629 MASKING TAPE 1.5"
10880 CARTON CR120
10893 CR120/CR150 INSERT
584000 NO6*1/2 FLANGE POZI
8P-8857 BLACK CR VENT

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