BK Stereo Amplifier 2002 S2 User Manual

B&K Components, Ltd.  
User Manual  
REFERENCE 200.1 S2 (Monoblock)  
REFERENCE 200.2 S2  
One or Two Channel Amplifier  
13743 0604  
 
1
TABLE OF CONTENTS  
ACCESSORIES AND LIMITED WARRANTY  
ii  
SPECIFICATIONS  
Back Cover  
Product Information  
Date of Purchase:  
Amp Model #:  
Amp Serial #:  
Purchased From:  
Address:  
Phone #:  
 
 
2
SAFETY PRECAUTIONS  
Installation Considerations  
CAUTION  
R I S K O F E L E C T R I C S H O C K  
D O N O T O P E N  
WARNING: to prevent fire or shock hazard, do not expose this unit to rain or moisture. Care should  
be taken to prevent objects or liquid from entering the enclosure. Never handle the power cord with  
wet hands.  
The lightning flash with arrowhead, within an equilateral triangle, is intended to alert the user of the  
presence of uninsulated "dangerous voltage" within the product's enclosure that may constitute a risk  
of electric shock to you.  
The exclamation point within an equilateral triangle is intended to alert the user of the presence of  
important operating and maintenance (servicing) instructions in the literature accompanying the unit.  
Caution: To prevent the risk of electric shock, do not remove cover. No user-serviceable parts  
inside. Refer servicing to qualified service personnel.  
Unplug the amplifier from the AC outlet when plugging in or unplugging cables, when left unused for  
an extended period of time, moving the amplifier, or when you suspect lightning in your area.  
Prevent damage to the power cord. Do not bend, pull, place objects on, alter, etc. Replace the  
power cord if it becomes damaged. Always grasp the plug on the power cord when plugging in or  
unplugging the amplifier from the AC outlet.  
Your system may produce sound levels capable of causing permanent hearing loss. Do not operate  
for extended periods of time at high volume levels.  
Make sure the amplifier is placed on a level surface.  
The amplifier is equipped with raised feet to provide ventilation, reduce acoustic feedback, and pro-  
vide protection against scratching the surface the unit is resting on. We advise against removing or  
altering feet.  
Do not stack anything on top of the amplifier (processor, source, etc.) Leave a minimum of 3"  
clearance from the top of the amplifier to the next shelf (or component) to insure proper ventilation.  
The amplifier should be located away from other sources that may be sensitive to heat.  
Do not perform any internal modifications to the amplifier.  
Always connect the amplifier's power cord to an unswitched, dedicated AC outlet for normal operation.  
If young children are present, adult supervision should be provided until the children are capable of  
following all rules for safe operation.  
Mistaking CONTROL OUTPUT or CONTROL INPUT connectors for audio/video inputs or outputs  
may damage your amplifier or other components.  
Damage can occur to your speakers if the power rating of each individual driver is exceeded by the  
amplifier. Ensure that all the drivers in your system are capable of handling not only the average  
power being delivered by the amplifiers, but also the peak power that is likely to be generated during  
strong passages.  
Reference 200.1 S2 or Reference 200.2 S2 amplifiers can have drivers connected in parallel to  
each amp channel. System impedance SHOULD NOT fall below the nominal impedance of the  
amplifier, i.e two 8speakers in parallel = 4(system impedance). Minimum stability refers to the  
periodic audio passages that demand large amounts of current at which time the output impedance  
drops.  
The amplifier should be serviced by qualified personnel when:  
A.  
B.  
C.  
D.  
The amplifier is not functioning properly.  
Objects have entered the chassis.  
The amplifier was exposed to rain or other type of moisture.  
The amplifier was dropped, or the chassis is damaged.  
 
 
3
PURPOSE AND FUNCTION  
PURPOSE AND FUNCTION  
The Reference 200.1 S2 (Single channel Monoblock) or Reference 200.2 S2 (Two channel) is a high power  
amplifier that is designed for use in all types of audio or audio/video systems.  
DESIGN AND CONSTRUCTION  
The Reference 200.1 S2 or Reference 200.2 S2 amplifier utilizes high quality electronic circuitry to achieve  
an environment wherein a detailed, transparent, and highly musical sound can be realized. The high quality  
parts complement includes: state-of-the-art solid state devices, 1% metal film resistors, computer grade elec-  
trolytic power supply capacitors, and a high capacity toroidal transformer. All B&K products are designed  
and hand assembled in Buffalo, NY U.S.A.  
The Reference 200.1 S2 or Reference 200.2 S2 operates with a class A predriver and AB MOSFET power  
output stages. These high power amplifiers are capable of delivering full range while reproducing the most  
demanding music passages effortlessly into the most demanding audiophile speakers.  
FEATURES  
High Current - Ability to cleanly, accurately, and reliably reproduce demanding recordings or source materials  
into low impedance drivers and speaker systems.  
Class A Predriver - Improves low level detail and clarity for smoother, more musical sound.  
AB MOSFET Output - Provides efficient and linear power delivery, as well as protection from thermal overload.  
Gold Plated Connectors - Improved sound with minimum signal loss and degradation.  
Five Way Binding Posts - High quality binding posts accommodate up to 4 gauge wire.  
Control Output - One 3.5mm (1/8”) 10-12 VDC @ 200 mA output for controlling other amplifiers or control-  
ling external systems that use a voltage trigger.  
Control Input - One 3.5mm (1/8”) jack that allows standby on/off with a 5-24 VDC control signal.  
Toroidal Transformer - Efficient, high current, shielded transformer that supplies the amplifier with a clean  
and constant supply of power, even during highly demanding source material passages.  
Discrete Circuitry - Dynamically provides a full, accurate, and three dimensional reproduction of source  
material.  
1% Metal Film Resistors - High quality resistors used in all active circuitry to reduce noise and obtain better  
sound purity.  
Computer Grade Capacitors - Large capacity computer grade electrolytic capacitors for extended low fre-  
quency control, increased power supply, and improved dynamics.  
Balanced Inputs - Balanced inputs deliver the quietest and most accurate signal path between the preampli-  
fier and amplifier.  
Full Power Operation - Capability to operate at full power with a square wave input.  
Differential Input Stage - A current source load assures DC stability and wide bandwidth linearity.  
5 Year Factory Warranty - All B&K products sold through an authorized dealers are covered by a 5 year  
parts and labor factory Warranty.  
Available Faceplates  
17” Black (Standard)  
17” Silver (Optional)  
19” Black Rack Mount (Optional)  
19” Silver Rack Mount (Optional)  
 
 
4
BACK PANEL  
8
7
6
5
CONTROL I/O  
CHANNEL  
1
INPUT  
CHANNEL  
2
INPUT  
High Performance  
Audio/Video Systems  
CTRL  
IN  
XLR (BALANCED)  
XLR (BALANCED)  
Hand-Made in the U.S.A.  
CTRL  
OUT  
12VDC  
200mA  
RCA INPUT  
XLR INPUT  
RCA INPUT  
XLR INPUT  
RCA (UNBALANCED)  
RCA (UNBALANCED)  
FUSE  
CAUTION: FOR CONTINUED  
PROTECTION AGAINST RISK  
OF FIRE REPLACE ONLY WITH  
SAME TYPE AND RATING.  
CHANNEL  
1
OUTPUT  
CHANNEL  
2
OUTPUT  
B
&
K
SERIAL  
#
SIMPLY BETTER!  
POSITIVE  
NEGATIVE  
POSITIVE  
NEGATIVE  
R I S K O F E L E C T R I C S H O C K  
D O N O T O P E N  
AC LINE  
1
2
3
4
1. AC Fuse Holder - Holds the AC line fuse. This fuse is a 12 amp / 250 volt slow bow fuse. Replace only  
with the same type and value fuse.  
2. AC Input Receptacle - For attaching the supplied AC power cord to the amplifier.  
3. Speaker Outputs - For connecting the speakers to the amplifier. Explained further on page 6.  
4. Speaker Fuses - For protection against amplifier damage in the case of shorted speaker wires. Replace  
fuse with the same type and value 6 amp slow blow.  
5. Balanced (XLR) Input - For connecting signal patch cables (interconnects) from the preamplifier to the  
amplifier. Explained further on page 5 and 6.  
6. Balanced/Unbalanced Input Select - This switch is used to configure a SINGLE AMPLIFIER CHANNEL  
for use as either balanced (XLR) or unbalanced (RCA) line inputs. This switch controls the amplifier channel  
and allows signal patch cables (interconnects) to be sourced from either balanced or unbalanced, preamplifi-  
er/processor or line outputs. Explained further on page 5 and 6.  
7. Unbalanced (RCA) Input - For connecting signal patch cables (interconnects) from the preamplifier to the  
amplifier. Explained further on page 5 and 6.  
8. Amplifier Control Input/Output - Provides remote switching of the amplifier's standby on/off feature.  
Explained further on page 8.  
 
 
5
INPUTS  
INPUTS  
The Reference 200.1 S2 or Reference 200.2 S2 allows signal patch cables (interconnects) to be sourced  
from either balanced or unbalanced preamplifier/processor outputs. A switch is used to configure a SINGLE  
AMPLIFIER CHANNEL for use with either a balanced (XLR) or unbalanced (RCA) output.  
CHANNEL  
1
INPUT  
XLR (BALANCED)  
RCA INPUT  
XLR INPUT  
RCA (UNBALANCED)  
XLR BALANCED  
There is one balanced (XLR) input connector on the Reference 200.1 S2 and two balanced (XLR) input con-  
nectors on the Reference 200.2 S2. These connectors accept balanced volume level output from the pream-  
plifier's balanced output connectors.  
Amplifier Balanced Input Connector  
Balanced Interconnect Cable  
PIN 2 (+)  
PIN 1 ((GND)  
PIN 2 (+)  
PIN 1 ((GND)  
PIN 3 (-)  
1
2
2
1
3
3
PIN 3 (-)  
RCA UNBALANCED  
There is one unbalanced (RCA) input connector on the Reference 200.1 S2 and two unbalanced (RCA) input  
connectors on the Reference 200.2 S2. These connectors accept an unbalanced (RCA) output from the pre-  
amplifier's (RCA) volume level outputs.  
Ground  
RCA connector  
Signal  
 
 
6
INPUT/OUTPUT CONNECTIONS  
Use either RCA unbalanced or XLR balanced to connect the preamplifier to amplifier.  
RCA Unbalanced Connections  
FRONT LEFT  
FRONT RIGHT  
CHANNEL  
1
INPUT  
CHANNEL  
2
INPUT  
High Performance  
Audio/Video Systems  
XLR (BALANCED)  
XLR (BALANCED)  
B
&K  
Hand-Made in the U.S.A.  
SIMPLY BETTER!  
RCA INPUT  
RCA INPUT  
XLR INPUT  
XLR INPUT  
RCA (UNBALANCED)  
RCA (UNBALANCED)  
BUTTON  
OUT  
BUTTON  
OUT  
OR  
Audio/Video Systems  
CHANNEL  
2
INPUT  
CHANNEL  
1
INPUT  
High Performance  
XLR (BALANCED)  
XLR (BALANCED)  
B
&K  
Hand-Made in the U.S.A.  
SIMPLY BETTER!  
RCA INPUT  
RCA INPUT  
XLR INPUT  
XLR INPUT  
RCA (UNBALANCED)  
RCA (UNBALANCED)  
R
BUTTON  
PUSHED IN  
BUTTON  
PUSHED IN  
FRONT LEFT  
FRONT RIGHT  
XLR Balanced Connections  
SPEAKER OUTPUTS  
Binding posts are provided for speaker connections. There is one pair provided  
for each amplifier channel output. They are designed to accept a banana-type  
plug, spade-lug connector (shown right), terminal posts, or bare wire. They are  
color coded for easy identification. The positive (+) RED post should always be  
connected to the speakers (+) RED jack. The negative (-) BLACK post should  
always be connected to the speakers (-) BLACK jack.  
Spade Connector  
Banana Jack  
CONTROL I/O  
CHANNEL  
1
INPUT  
CHANNEL  
2
INPUT  
High Performance  
Audio/Video Systems  
CTRL  
IN  
Shown right is the ampli-  
fier to speaker connec-  
tions (4 gauge (AWG)  
wire maximum).  
XLR (BALANCED)  
XLR (BALANCED)  
Hand-Made in the U.S.A.  
CTRL  
OUT  
12VDC  
200mA  
XLR INPUT  
XLR INPUT  
RCA INPUT  
RCA INPUT  
RCA (UNBALANCED)  
RCA (UNBALANCED)  
FUSE  
CAUTION: FOR CONTINUED  
PROTECTION AGAINST RISK  
OF FIRE REPLACE ONLY WITH  
SAME TYPE AND RATING.  
CHANNEL  
1
OUTPUT  
CHANNEL  
2
OUTPUT  
B
&
K
SERIAL  
#
SIMPLY BETTER!  
**NOTE: 200.1 S2 has  
two pairs of binding  
posts for bi-wiring.  
POSITIVE  
NEGATIVE  
POSITIVE  
NEGATIVE  
R
I
S
K
O F E L E C T R I C S H O C K  
D O T O P E N  
O
N
AC LINE  
( + ) ( - )  
( + ) ( - )  
Channel 1  
Channel 2  
 
 
7
SYSTEM INSTALLATION  
There will most likely be a number of cables involved in the installation of your home entertainment system.  
Preplanning is essential in order to maximize system efficiency. We recommend the following as a means of  
helping you reach that goal.  
When possible, use a dedicated AC power line for the amplifier, one that is not shared by any other  
household component. THIS IS VERY IMPORTANT!!  
Make a diagram of your proposed system by laying out the relative location of each component in  
the system. Then lay out the proposed cable runs between them. Number each cable and record its  
length.  
Cable runs are critical in that they must be kept away from the sources of power radiation (ampli-  
fiers, power cords, heaters, appliances, etc.). For safety reasons, they should also be kept out of traf-  
fic areas.  
The process of optimizing the system will include the type of cable, the length of the run, and the  
obstructions it must deal with along its run. Your dealer can advise you on the products available and  
their relative merits. If building custom length audio cable is not your strength, you dealer should be  
able to help you with that as well.  
Tip: Take a piece of string (longer than the longest cable run) and mark it at each foot of length. Then do a  
mock cable run using the string, dressing it neatly along the way. Count the divisions to the next full foot, and  
add one foot to all for some movement of the components. This will provide you with ideal cable length.  
MAKING THE CONNECTION  
Refer to back panel on page 4  
As a precaution, insure that the power switch on the amplifier's front panel is in the 'off' position and  
AC power is disconnected before making any connections.  
Connect the wires from your speakers to the appropriate output channels on the amplifier. It is  
essential that correct polarity is observed in all connections.  
Connect the audio cables from the preamplifier's audio outputs to the amplifier input channels using  
either balanced (XLR) or unbalanced (RCA) interconnects.  
Example: Connect Front Left output of the preamplifier to channel 1 of the amplifier, connect the Front Left  
speaker wires to channel 1's outputs. Always observe polarity when connecting speakers, i.e. amplifier  
(+) RED to the speaker (+) RED and amplifier (-) BLACK to speaker (-) BLACK..  
Double-check all connections.  
It is recommended that a dedicated AC power outlet is used for the amplifier, one that is not shared  
by any other audio or household component.  
Locate the AC power cord provided with the amplifier and plug it into the power input receptacle in  
the rear panel. Make sure front panel power switch is off (out). Do not connect to the AC power until  
speaker connections are complete!  
Connect a playback unit (CD, DVD, SAT, Tuner, etc.) to the preamplifier. Turn on the preamplifier,  
turn the volume on the preamplifier to a minimum level, and then turn on the amplifier using the power  
switch on the front panel (in this order). Set the source on the preamplifier to the playback unit con-  
nected. Turn the volume up slowly and listen for music from all channels.  
If a problem is encountered that cannot be traced to the hardware connections or to the material being  
played, consult the "TROUBLESHOOTING" section on page 9.  
Note: If the control triggers are not being used, the amplifier should always be turned off first, then the preamplifier.  
Before turning anything on, insure the preamplifier is at a low volume level.  
 
 
8
CONTROL TRIGGERS  
A control (trigger) system is provided on the Reference 200.1 S2 or Reference 200.2 S2 amplifiers to allow  
remote switching of the amplifier's standby on/off feature. The control input is designed to operate with a  
source (trigger) of 5-24 volts DC. All B&K A/V processors and preamplifiers utilize control output triggers to  
easily integrate an amplifier into an audio system.  
In addition, your amplifier has a control output circuit to allow control of an external device such as another  
power amplifier, projection screen, power strip, etc. The control output has the capability to source 10-12VDC  
@ 200 mA (on) or 0 VDC (off).  
If more than one amplifier is being controlled, the control output may be extended to include each successive  
unit by simply connecting a 3.5mm (1/8”) mini-jack cable from the CTRL OUT connector of the first amplifier  
to the CTRL IN connector of next amp (commonly referred to as 'daisy chaining'). An example of how to con-  
nect two amplifiers is illustrated in the diagram below.  
Daisy Chained Control I/O  
CONTROL I/O  
CONTROL I/O  
CONTROL IN ALLOWS AMPLIFIER  
OPERATION WHEN A 5-24V SIGNAL  
IS APPLIED WITH A 3.5mm MINI JACK  
CONTROL IN ALLOWS AMPLIFIER  
OPERATION WHEN A 5-24V SIGNAL  
IS APPLIED WITH A 3.5mm MINI JACK  
CTRL  
IN  
CTRL  
IN  
Daisy chain to  
other amplifiers  
Connects to  
preamp control output  
CTRL  
CTRL  
OUT  
12VDC  
200mA  
OUT  
12VDC  
200mA  
Rear view of second  
amplifier with control I/O  
Rear view of first amplifier  
with control I/O  
DO NOT POWER MOTORS WITH THE CONTROL OUT CIRCUIT!!!  
If the control function is desired, each unit in the system must remain connected. The control is enabled when  
the 3.5mm jack is inserted into the CTRL IN. For more information on the amplifier's output status under vari-  
ous control conditions, refer to the table below.  
*Note: The control input voltage is intended for standby on/off control only. For best amplifier operation, each  
amplifier is recommended to have its own source of AC power.  
Operational Outline  
Hardware (3.5mm)  
@ CTRL IN  
Output Status  
@ CTRL OUT  
Not Connected  
Connected  
No Voltage  
No Voltage  
Voltage  
Sound  
No Sound  
Sound  
+12V  
0V  
Connected  
+12V  
 
 
9
TROUBLESHOOTING  
PROBLEM  
No sound  
(power 'on' LED not illu- 2. Power off at AC source.  
minated). 3. AC power inlet fuse blown or 3. Check for shorts or overloading.  
faulty. 4. Supply Control IN with a 5-24 Volt  
POSSIBLE CAUSE  
POSSIBLE SOLUTION  
1. Reconnect power cord.  
2. Check AC switch or fuse.  
1. Power cord not plugged in.  
4. Control voltage not activated. DC supply (Page 8).  
5. Power switch in off position 5. Push in power switch.  
(out).  
No sound on some or all 1. Speaker leads loose or faulty. 1. Tighten, repair or replace cable.  
selected channels 2. Preamp to amp cables loose 2. Tighten, repair or replace cable.  
(power 'on' LED illuminat- or faulty.  
3. Tighten, repair or replace cable.  
4. Check all source settings.  
5. Check all speaker fuses and replace  
ed).  
3. Source to line stage cables  
loose or faulty.  
4. Line stage or source not cor- if blown. Replace fuse with same type  
rectly selected.  
and value.  
5. Speaker fuse blown.  
6. Balanced button “in” when  
using RCA’s.  
6. Press balanced button to switch bal-  
anced inputs off (out position).  
Sound lacks direction  
weak bass.  
1. Speakers connected out of  
phase.  
1. Check all connections making sure  
that cables are connected (+) to (+) and  
(-) to (-).  
Loud hum or buzz on  
one or more channels.  
1. Poor ground connection in  
inter-connect cables.  
1. Check all connectors and repair as  
necessary.  
Channel sounds  
distorted and low output.  
1. Blown rail fuse.  
1. WARNING: Blown rail fuses can be  
an indication of a larger problem.  
Replace ONLY with same type and  
value. If fuses continue to blow, con-  
sult a service professional.  
Rail fuses require internal service.  
***Note: If unit continues to blow power fuses, DO NOT USE A HIGHER RATED FUSE, please con-  
tact customer service to have the unit serviced. When servicing fuses always disconnect AC power  
before replacing.  
CARE AND CLEANING  
Under normal use, the amplifier will not require any special care. Over time you may wish to clean  
the exterior of the unit by wiping it with a cloth to remove any dirt or dust that accumulates on it.  
Unplug the amplifier and be sure that it has completely powered down before cleaning. Do not let  
any liquid enter the amplifier through the vents in the top cover. LIQUIDS CONDUCT ELECTRICI-  
TY!!! You may clean the connectors on the back panel with isopropyl alcohol annually.  
 
 
SPECIFICATIONS  
REFERENCE 200.1 S2 Monoblock & REFERENCE 200.2 S2  
Power Rating: 8200.1 / 200.2  
250 watts / 225 watts  
450 watts / 375 watts  
Power Rating: 4200.1 / 200.2  
Number of Channels  
Current (peak to peak)  
Dynamic Headroom  
Total Harmonic Distortion (THD)  
Signal to Noise (S/N)  
Input Impedance  
1
/
2
150 Amps / 75 Amps  
1.4 dB  
0.09 %  
95 dB  
33.2 kΩ  
750  
/
1.2 dB  
Damping Factor (50 Hz)  
Frequency Response  
Slew Rate  
/
450  
5 Hz - 45 kHz  
14 V / µsec  
1.4 Volt  
Input Sensitivity RCA Unbalanced  
Input Sensitivity XLR Balanced  
Gain  
2.8 Volts | Pin 1 = Gnd, Pin 2 = In +, Pin 3 = In -  
28.3AV* or 28dB  
AC Line Voltage  
120 / 220 / 240 VAC (optional / switchable)  
Level Controls  
No  
Binding Post Maximum Wire Gauge  
Balanced Inputs  
4 AWG  
Yes  
Control Input  
5 - 24 VDC  
10 - 12VDC 200mA  
Control Output  
Dimensions in Inches  
(Cutout Dimensions)  
Width  
Height  
Depth  
17.00 (17.12)  
5.78 (5.90)  
15.63 (16.75)  
Shipping Weight  
42 lbs.  
875 watts max  
Power Consumption  
9 Amps max current draw  
75 watts @ no input  
AC Line - 12 Amp / 250 Volt Slow Blow  
Rails: 200.1 - 12 Amp / 250V Slow Blow  
200.2 - 6 Amp / 250V Time-Lag  
Replacement Fuses  
Speakers - 6 Amp / 250 Volt Slow Blow  
*AV - Amplified Voltage  
 

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