Laney B1 User manual

B
Series
Service Manual
B1
b2
b3
Laney www.laney.co.uk

Drawing number 3189
Issue 1
Drawn by RJF
Date 05/12/00
Updated
Drawing number 3189
Issue 1
Drawn by RJF
Date 05/12/00
Updated
B2/B3 Combo
Wiring Details
B2/B3 Combo
Wiring Details
Power Consumption
750Watts ~50-60Hz
Power Consumption
750Watts ~50-60Hz
Made in the United Kingdom by BLT Industries Ltd.
Attention.
Debrancher le cordon d’alimentation
avant toute intervention.
Attention.
Debrancher le cordon d’alimentation
avant toute intervention.
Serial No:-Serial No:-
Avis
Risque de choc electrique - ne pas ouvrir.
Avis
Risque de choc electrique - ne pas ouvrir.
!
CAUTION
RISK OF ELECTRIC SHOCK - DO NOT OPENRISK OF ELECTRIC SHOCK -DO NOT OPEN
Warning
To reduce the risk of fire or electric shock do not
expose this appliance to rain or moisture.
Warning
To reduce the risk of fire or electric shock do not
expose this appliance to rain or moisture.
Caution
To reduce the risk of electric shock do not remove covers.
No user serviceable parts inside. Refer servicing to
qualified personnel only.
Caution
To reduce the risk of electric shock do not remove covers.
No user serviceable parts inside. Refer servicing to
qualified personnel only.
Warning This equipment must be earthed.Warning This equipment must be earthed.
Aux
In
Aux
In
Effects
Loop
Effects
Loop
Send
0dB
-10dB
Bypass
Return
Direct
Inject
Direct
Inject
Pre EqPre Eq
Post EqPost Eq
Amp ModeAmp Mode
Internal+Sub
Bi-amp
Internal Only
Internal Only
Pre-Amp
Out
Pre-Amp
Out
Footswitch
Lo
Hi
Level
Active CrossoverActive Crossover
2
4 4
2
1 1
5
3
3
5
-+0-+0
Bi-Amp/Hi
Bi-Amp/Lo
Min Load
2 Ohms
Min Load
2Ohms
Min Load
2 Ohms
Min Load
2Ohms
Sub/LoSub/Lo
Internal/Hi
115V
230V
~
~
115V
230V
~
~
Supply VoltageSupply Voltage
Push To ResetPush To Reset
L
o
c
k
L
o
c
k
U
n
l
o
c
k
U
n
l
o
c
k
L
o
c
k
L
o
c
k
U
n
l
o
c
k
U
n
l
o
c
k
Caution
Refer to users manual for recommended
speaker connections.
Caution
Refer to users manual for recommended
speaker connections.
2+
2- 1-
1+
+
2+
2- 1-
1+
+
+
+
+
--
+
--
-
2+
2- 1-
1+
+
PAD
On
Speakon - BLT Part Nos 10682Speakon - BLT Par t Nos 10682
To Internal / Hi SocketTo Internal / Hi Socket
To Sub / Lo SocketTo Sub / Lo Socket
15 inch Loudspeaker
Part Nos . 41522
(B3 only)
15 inch Loudspeaker
Part Nos . 41522
(B3 only)
2 off 10 inch Loudspeakers
Part Nos . 41026
(B2 + B3))
2 off 10 inch Loudspeakers
Part Nos . 41026
(B2 + B3))
Fostex HornFostex Horn
Cable QCable Q
Cable UCable U
View from Rear of Speaker Plate (unprinted face)
Shows switch orientation
B2 and B3 Cabinet Wiring Details

B Series Bass Amplifiers
D:\RST\MISC\B Series Ampifiers THD measurement.doc
Created by R&D3 On 08/12/00 Page 1/1
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. No Filtering on output
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.
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

Page 1/5
10702
SPECIAL MAINS LEAD
1
10958
B1 USER MANUAL
1
20480
B1 CABINET ASSY
-1
7904 B1 CHASSIS ASSY 1
7904
B1 CHASSIS ASSY EURO/UK
-1
->001048
10M .25W RESISTOR
1
->001401
22K 1W RESISTOR
2
->002022
10000UF 100V CAPACITOR/SAMWHA
2
->002204
680NF 250V 22.9mm
3
->003043
3MM BLUE DIFFUSED LED
6
->005632
M3*20 PLASTIC SPACER HEX
2
->005320
CHASSIS MOUNT MAINS FILTER
1
->005319
3A FILTERED MAINS INLET
1
->005321
3A THERMAL RELEASE SWITCH
1
->005503
7.5mm ROUND BLACK
4
->005510
3MM SOLDER TAG
1
->005511
5MM SOLDER TAG
11
->005512
6mm SOLDER TAG
2
->005536
LARGE GRIPPACLIP
2
->005548
ECC83 VALVE
1
->005558
100mm TIE WRAP
20
->005574
10 WAY (T) CONNECTOR
3
->005625
NOB P670-90F SPLINE
1
->005659
SHORT BOARD SPACER 12.7MM
14
->005660
DB SERIES LARGE KNOB/30MM
1
->005664
RBG CHROME KNOB 18mm
8
->005664/CP
18MM KNURLED KNOB
8
->009150
3mm HEX NUT
4
->009151
3mm INT SHAKEPROOF
4
->009154
3*12mm Z/B PAN POZI
4
->009160
4mm HEX NUT
13
->009161
4mm INT. SHAKEPROOF
19
->009163
4*20mm PAN POZI
5
->009166
4*25 CSK BLACK POZI
2
->009167
4*8 PAN POZI TAPTE
12
->009173
5*12mm PAN POZI
1
->009181
5mm BRASS HEX NUT
1
->009189
5mm CAGE NUT
4
->009190
6 WAY END CONNECTOR
4
->009199
3 WAY IDC CONNECTOR
2
->009200
NO 6*3/8 FLANGE POZI
6
->009204
NO 4*1/4 PLASTITE
22
->009217
4mm NUTSERT
8
->522032
35A BRIDGE RECTIFIER
1
->530027
DPST EQ MAINS SWITCH
2
->530066
SPEAKON SOCKET
3
->540038
EARTH WARNING LABEL
1
->541004
HC25/50 4.8 FASTON
18
->541053
1/4" LG RECEPTACLE
17
->541071
POZI LOCK NYLON BOOT
12
->582007
4*10mm SMALL F/H
18
->586003
M8 * 60 COACH BOLT
1
->586023
8mm SHKPRF WASHER
1
->588006
POP RIVET (BLACK)
6
->589041
50mm CAPACITOR CLAMP
2
->5P-50036
MX500 CAP STRAP
-1
->8P-9244
B1 FACIA DWG NO 3057
-1
->8P-9245
B1 REAR DWG NO 3135
-1
->8P-9246
B1 CHASSIS DWG NO 3107
-1
->8P-9248
B1 HEATSINK EXTR DWG NO 3148
-2
->8T-6142A
B1 MAINS TX + CRIMPS
-1
->->8T-6142
B1 MAINS 115/230 TX
-1
->007905
B1 PREAMP ASSY PCB 9331
-1
->->001046
27KSM 1206 1% RESISTOR
1
->->001207
100K .5W 1% RESISTOR
2
->->001300
ORO SHORTING LINK
47
->->001303
100R 5% RESISTOR
1
->->001305
2K2 5% RESISTOR
20
->->001306
10K 5% RESISTOR
38
->->001308
68K 5% RESISTOR
2
->->001309
1M 5% RESISTOR
2
->->001310
100K 5% RESISTOR
17
->->001311
470R 5% RESISTOR
10
->->001312
4K7 5% RESISTOR
4
->->001314
8K2 5% RESISTOR
2
->->001315
47K 5% RESISTOR
2

Page 2/5
->->001316
22K 5% RESISTOR
11
->->001326
3K3 5% RESISTOR
4
->->001327
1K 5% RESISTOR
7
->->001329
330R 5% RESISTOR
4
->->001330
220K 5% RESISTOR
5
->->001332
330K 5% RESISTOR
2
->->001334
150K 5% RESISTOR
1
->->001336
470K 5% RESISTOR
2
->->001714
10K 5W RESISTOR
2
->->001920
ZERO OHM RESISTOR
26
->->002004
47UF 50V RADIAL
3
->->002013
10UF 50V CAPACITOR
11
->->002015
10uf 400V RADIAL
3
->->002024
2.2UF 63V RADIAL
2
->->002025
1UF 63V RADIAL
2
->->002027
4.7UF 63V RADIAL
1
->->002037
220N 5MM BOX POLY CAPACITOR 63V
6
->->002038
330N 5MM BOX POLY CAPACITOR 63V
1
->->002410
100NF 400V 15MM
2
->->002417
4.7NF 100V 5mm
1
->->002419
100NF 63V 5mm
24
->->002420
22NF 100V 5mm
2
->->002425
47NF 100V 5mm
9
->->002426
15NF 100V 5mm
1
->->002428
33N 100V 5MM
1
->->002602
47PF 50V 10% COG
11
->->002603
100PF 50V 10% COG
2
->->002605
470PF 50V 10% COG
1
->->002804
4N7 1000V CERAMIC
4
->->003000
1N4007 DIODE
4
->->003007
3V9 .5WZENER DIODE
2
->->003011
5V1 .5WZENER DIODE
1
->->003018
10V .5WZENER DIODE
4
->->003022
3mm GREEN LED
1
->->003033
3mm LED RED
2
->->003041
5MM FERRITE BEAD
3
->->003043
3MM BLUE DIFFUSED LED
13
->->003500
BAS16 DIODE
13
->->003503
BC847B TRANSISTOR
5
->->003506
TMPF3820 TRANSISTOR
8
->->003508
34072 IC (SMD TL072)
15
->->003805
LB1413 BARGRAPH DRIVER
2
->->003901
7815 IC VOLT'REGULATOR
1
->->003902
7915 IC VOLT'REGULATOR
1
->->003910
CD4069UBE IC
1
->->003932
0-9/9V PCB MOUNT TRANSFORMER
1
->->004000
1K HORIZ PRESET
1
->->004016
470K HORIZ PRESET
1
->->004019
10K HORIZ PRESET
2
->->004103
A100K 27.5mm POT
2
->->004104
A10K 27.5mm POT
2
->->004109
B10K DUAL 27.5MM POT
1
->->004110
B10K 27.5MM POT
4
->->004112
B10K ILLUMINATED SLIDER
6
->->005030
HEATSINK TV5
2
->->005035
90o 10 WAY HEADER
1
->->005062
6W 90o LOCKING HEADER
1
->->005072
3 WAY 90 DEGREE LOCKING HEADER
1
->->005103
0.9A POLY SWITCH/MF-R090
1
->->005304
8.5mm VERTICAL PUSH SWITCH
4
->->005309
6.3MM PHONE JACK
3
->->005579
B9A VALVE BASE
1
->->005657
LED SPACER 12.7mm
16
->->005686
4.8MM TERMINAL SPADE
4
->->009331
B1 PREAMP ISSUE 6
1
->->521010
SSM2018P VOLT'CONTROL AMP'
1
->->541004
HC25/50 4.8 FASTON
2
->->588006
POP RIVET (BLACK)
2
->007907
B1 EFFECTS LOOP ASSY PCB 9332
-1
->->001300
ORO SHORTING LINK
12
->->001301
10R 5% RESISTOR
4
->->001302
47R 5% RESISTOR
2
->->001303
100R 5% RESISTOR
2
->->001306
10K 5% RESISTOR
20
->->001310
100K 5% RESISTOR
3
->->001316
22K 5% RESISTOR
1
->->001326
3K3 5% RESISTOR
1

Page 3/5
->->001327
1K 5% RESISTOR
2
->->001329
330R 5% RESISTOR
2
->->001331
33K 5% RESISTOR
4
->->001334
150K 5% RESISTOR
4
->->002004
47UF 50V RADIAL
6
->->002013
10UF 50V CAPACITOR
7
->->002401
22NF 400V 10MM
2
->->002402
220NF 250V 15MM DIPPED POLYSTER
2
->->002419
100NF 63V 5mm
6
->->002421
10NF 100V 5mm
4
->->002603
100PF 50V 10% COG
3
->->002605
470PF 50V 10% COG
2
->->003031
SURGE GUARD SCK\20-10-8A
1
->->003041
5MM FERRITE BEAD
12
->->003500
BAS16 DIODE
2
->->003508
34072 IC (SMD TL072)
5
->->004082
4mm 10K LIN POT
1
->->005016
5 WAY DIN SOCKET
1
->->005032
SLIM JACK SOCKET-S1BNB
6
->->005035
90o 10 WAY HEADER
2
->->005036
6 WAY LOCKING HEADER
2
->->005047
16A 24V RELAY
1
->->005610
2 POLE 2 WAY (MX)
1
->->005624
XLR SKT MALE 90DEG
1
->->005686
4.8MM TERMINAL SPADE
4
->->009332
B1 FX LOOP PCB ARRAY
1
->->530023
4P 3W SLIDE SWITCH
2
->->571014
10 TURN CHOKE
2
->007906
B1/CA OUTPUT ASSY PCB 9333
-1
->->001068
5R6 1W 5% WW RESISTOR
4
->->001069
OR01 2W5 5% WIREWOUND RESISTOR
4
->->001070
18KSM 1206 1% RESISTOR
2
->->001073
33R 2W5 5% RESISTOR
2
->->001300
ORO SHORTING LINK
2
->->001302
47R 5% RESISTOR
1
->->001305
2K2 5% RESISTOR
1
->->001306
10K 5% RESISTOR
11
->->001309
1M 5% RESISTOR
4
->->001312
4K7 5% RESISTOR
4
->->001315
47K 5% RESISTOR
3
->->001318
6K8 5% RESISTOR
1
->->001327
1K 5% RESISTOR
2
->->001400
10K 1W RESISTOR
1
->->001511
1K 2.5W RESISTOR
2
->->001705
680R 5W RESISTOR
1
->->001920
ZERO OHM RESISTOR
1
->->002004
47UF 50V RADIAL
4
->->002009
1000UF 25V RADIAL
3
->->002013
10UF 50V CAPACITOR
1
->->002014
100UF 35V RADIAL
1
->->002025
1UF 63V RADIAL
3
->->002029
220UF 25V CAPACITOR
1
->->002035
100N 100V 5MM BOX POLY
6
->->002036
100UF 100V RADIAL CAP
2
->->002039
220N 250V POLYPROPYLENE CAP
2
->->002041
100N 250V 5MM POLYESTER CAPACITOR
2
->->002410
100NF 400V 15MM
2
->->002419
100NF 63V 5mm
8
->->002818
47PF 500V CERAMIC
2
->->003000
1N4007 DIODE
6
->->003007
3V9 .5WZENER DIODE
2
->->003014
15V 1.3WZENER
1
->->003017
1.5A 200V BRIDGE
1
->->003018
10V .5WZENER DIODE
1
->->003022
3mm GREEN LED
2
->->003041
5MM FERRITE BEAD
5
->->003042
BYW100-200-FAST RECOVERY DIODE
4
->->003411
MPSA42/43 TRANSISTOR
2
->->003422
STW38NB20 N CHANNEL MOSFET T0247
4
->->003423
TA0104A TRIPATH DIGITAL AMPLIFIER
2
->->003424
LM7812 12V REGULATOR
1
->->003500
BAS16 DIODE
7
->->003503
BC847B TRANSISTOR
3
->->003504
BC857B TRANSISTOR
1
->->003508
34072 IC (SMD TL072)
1
->->003610
TIP31C TRANSISTOR
2
->->003901
7815 IC VOLT'REGULATOR
1

Page 4/5
->->003902
7915 IC VOLT'REGULATOR
1
->->003905
7805 IC
1
->->004019
10K HORIZ PRESET
2
->->005030
HEATSINK TV5
3
->->005036
6 WAY LOCKING HEADER
1
->->005038
1/4" SPADE TERMINAL
7
->->005063
3 WAY LOCKING HEADER
3
->->005076
290MM TIE WRAP
1
->->005103
0.9A POLY SWITCH/MF-R090
3
->->005316
8W PCB SOCKET
2
->->005317
11.3UH 20A INDUCTOR
2
->->005318
12W PCB SOCKET
2
->->005322
ALUMINIUM OXIDE FET WASHER
4
->->005558
100mm TIE WRAP
2
->->005609
30A RELAY
2
->->005686
4.8MM TERMINAL SPADE
6
->->009150
3mm HEX NUT
7
->->009151
3mm INT SHAKEPROOF
7
->->009333
CA/B1 DIGITAL OUTPUT PCB
1
->->543508
SHORTING LINK (IDC)
2
->->581018
3*20mm PAN POZI
7
->->588006
POP RIVET (BLACK)
3
->->588058
M3*10mm HEX TAPPED
5
->->8P-9243
CA/B1 OUTPUT TRAY DWG NO 3130
-1
->->8P-5071
CA1500/600/B1 FET CLAMPING BAR
2
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 SMALLLANEY 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 10mmTEENUT 8.000
10204 5mm X 25mm PANPOZI 20.000
10224 35mm FINISHED NAILS 40.000
10231 No8x1/2" FLANGEPOZI 26.000
10232 NO10x1 1/2 FLANGE HD 6.000
10233 M5*30 FLANGEPOZI BK 4.000
10240 10 * 1 CSKPOZI 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 FLANGEPOZI 4.000
10256 8*1 FLANGEPOZI 4.000
10312 15mm PLYWOOD 0.450
10314 18mmMDF 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 5/5
B3 CABINET
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 SMALLLANEY 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 10mmTEENUT 36.000
10204 5mm X 25mm PANPOZI 36.000
10224 35mm FINISHED NAILS 40.000
10231 No8x1/2" FLANGEPOZI 26.000
10232 NO10x1 1/2 FLANGE HD 4.000
10233 M5*30 FLANGEPOZI BK 4.000
10240 10 * 1 CSKPOZI 4.000
10243 NO4*1/2 TYPE B CSK 2.000
10244 FLAT SPIRE CLIP 2.000
10247 NO8*1/2 FLANGEPOZI 4.000
10312 15mm PLYWOOD 1.000
10314 18mmMDF 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
8
10055 PLASTIC CABINET FOOT
4
10100 STRAP HANDLE
1
10200 M5 x 10mm TEENUT
2
10202 5mm X 25mm CSK POZI
2
10224 35mm FINISHED NAILS
12
10225 STAPLES 97/12
3
10234 No 8 X 3/4 CSK POZI
16
10250 M5*45 FLANGE
4
10301 18mm CHIPBOARD
0.1
10326 BLACK CARPET
0.35
10600 32/18 STAPLES
12
10621 POLY. BAG 30(0) X 36
1
10629 MASKING TAPE 1.5"
0.02
10880 CARTON CR120
1
10893 CR120/CR150 INSERT
1
584000 NO6*1/2 FLANGE POZI
8
8P-8857 BLACK CR VENT
-2