BK Stereo Amplifier ST1430 Series II User Manual

B & K Components Ltd.  
P/N 12690  
 
Safety Precautions  
Purpose and function  
Design and construction  
Features  
Page 2  
Page 3  
Page 3  
Page 3  
Rear panel view  
Rear panel description  
Control muting  
Level controls  
Page 4  
Page 4 - 5  
Page 5 - 6  
Page 6  
Outputs  
Page 7  
Inputs  
Page 7 - 8  
Page 8  
System installation  
Making the connection  
Troubleshooting  
Care and cleaning  
Specifications  
Page 9  
Page 10  
Page 10  
Page 11  
page 12  
Warranty  
Manual and Power cord  
Page 1  
 
WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS UNIT  
TO RAIN OR MOISTURE.  
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 be sufficient magnitude to 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.  
Observance of polarity is essential. Double-check connections before turning  
the amplifier on. The amplifier can be damaged if polarities are incorrect.  
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 speaker system  
are capable of handling not only the power being delivered by the amplifier, but  
the energy that is likely to be generated during strong passages.  
Turn amplifier ‘off’ when plugging in or unplugging input and speaker cables!!!  
The ST1430 series II is equipped with raised feet so that continuous ventilation  
can be maintained. They help to maintain acoustic feedback into the amplifier at  
a minimum. They also provide a measure of protection against scratching any  
surface the unit might be resting on.  
Do not stack anything on top of the amplifier (preamplifier, processor,  
source...etc.).  
Leave at least 2-3 inches clearance from the top of the amplifier to the next shelf,  
component, etc., to ensure proper ventilation.  
* If you are at all unsure of what the speaker ‘ratings’ are, contact your dealer.  
Page 2  
 
The ST1430 series II is a compact, very efficient, three channel power amplifier. It is  
designed to be used in all types of audio or audio/video systems.  
The ST1430 series II 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 include state-of-the-art solid state devices, 1% metal film  
resistors, computer grade electrolytic power supply capacitors, and a high capacity  
toroidal transformer.  
The ST1430 series II operates class A predriver and AB high current MOSFET power  
output stages. It is capable of reproducing the most demanding audio signals at rated  
power levels.  
- Efficient high current transformer for improved dynamics.  
- More accurate and three dimensional reproduction of source  
material.  
- Improves low level detail for smoother, more musical sound.  
- For efficient and linear power delivery.  
- Provides short term protection from accidental shorting of output  
devices and protection from thermal overload.  
- Improve connections for better sound and minimized signal  
loss and degradation.  
- Low noise resistors for better sound and a greater degree  
of repeatability.  
- Ability to reproduce demanding recordings.  
- Large capacity computer grade electrolytic capacitors  
for extended low frequency control and improved dynamics.  
Page 3  
 
1. AC fuse holder  
4. Inputs  
2. AC Input receptacle  
3. Speaker outputs  
5. Level controls  
6. Amplifier control muting input/output  
1. AC fuse holder -  
Holds the AC Line fuse. This fuse is an 8 Amp / 250 Volt  
Slow Blow fuse. Replace with same type and value fuse  
only.  
2. AC Input receptacle - For attaching the supplied AC power cord to the  
amplifier.  
3. Speaker outputs -  
4. Inputs -  
For connecting the speakers to the amplifier. Explained  
further on page 7.  
For connecting signal patch cables (interconnects) from the  
preamplifier to the amplifier to pass signal. Explained further  
on page 7.  
Page 4  
 
5. Level controls -  
For adjusting the input level of each channel into the  
amplifier. There are level controls on the back of the  
amplifier. One level control for each channel. Explained  
further on page 6.  
6. Amplifier control muting input/output -  
To provide remote switching of mute on/off of the amplifier.  
Explained further below.  
A control is provided on each ST1430 series II amplifier to allow remote switching of  
mute on/off. The preamplifier’s control output, such as is provided with B&K series  
preamplifiers, can be utilized to provide a control signal to the ST1430 series II. If more  
than one amplifier is being controlled, the control signal can be extended to include  
each successive unit by simply running an RCA type audio cable from the CTRL OUT  
connector of the first amplifier to the CTRL IN connector of the next unit (commonly  
referred to as ‘daisy chaining’). An example of how to connect two amplifiers is  
illustrated in figure B.  
If a source other than a B&K series preamplifier is used to control multiple amplifiers,  
only the control output voltage from the source is critical. It must be within the range, as  
indicated on the rear panel, 5-24 volts DC is required. The amplifier will provide each  
successive amplifier with a control voltage of 12 volts DC for reliable operation. The  
amplifiers control output may be used as a source of 12 VDC @ 125 mA for other user  
applications as well.  
Page 5  
 
If the control function is desired, each unit in the system must remain connected at all  
times and the control must be enabled. To enable the control function, the CTRL  
ENABLE button must be out for each controllable amplifier in the system. For more  
information on the amplifiers output status under various control conditions, refer to the  
table below.  
@ CTRL IN  
Signal  
Button position  
Output status  
Sound  
@ CTRL OUT  
Signal  
OUT  
IN  
Signal  
Sound  
Signal  
No Signal  
No Signal  
OUT  
IN  
Mute  
No Signal  
Signal  
Sound  
The level controls are an option that can be added to the amplifier. If your amplifier has  
this option, the balanced inputs are not present.  
There are three level controls on the back of the amplifier. One level control for each  
channel.  
When using the level controls, first start with them turned all the way up (clockwise).  
Then adjust them according to your system requirements to match the sound level  
coming from each speaker.  
Page 6  
 
Five way binding posts are provided. One pair for each channel. They are designed to  
accept a banana-type plug or spade lug connector (shown below) and are color coded  
for easy identification. The red (+) post should always be connected to the speakers (+)  
jack. The black (-) post should always be connected to the speakers (-) jack.  
Spade connector Banana jack  
Here is a typical amplifier setup:  
Unbalanced - RCA type connectors accept line input from the preamplifier’s  
unbalanced output connectors. There are three input connectors, one  
for each channel, that may be used to connect the amplifier to the  
preamplifier.  
RCA cable connector -  
Page 7  
 
Here is a typical input setup:  
There will most likely be a number of cables involved in the installation of your home  
entertainment system. Pre-planning is essential in order to maximize system efficiency.  
We recommend the following as a means of helping you reach that goal:  
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 on the diagram for future  
reference.  
Cable runs are critical in that they must be kept away from sources of power  
radiation (amplifiers, power cords, heaters, etc...). For the sake of safety, they  
should also be kept out of traffic 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 cables is not your strength, your dealer should be able to help you  
with that as well.  
When possible, use a separate AC power line for the amplifier, one that is not  
shared by any other component in the system of any other house hold  
component.  
Page 8  
 
Before doing anything, ensure that the power switch on the amplifier’s front panel  
is in the ‘off’ position. Again, it is recommended that you locate a separate AC  
power outlet for the amplifier, one that is  
shared by any other audio  
component in the system or any other house hold component. This will eliminate  
the possibility of the amplifier ‘modulating’ the power being supplied to the  
component and compromising the signal originating from that component.  
Locate the AC power cord provided with the amplifier and plug it into the power  
input receptacle in the rear panel.  
Connect the audio cables from your preamplifier’s output to the corresponding  
input connector on the amplifier.  
Connect the wires from your speakers to the appropriate output on the amplifier.  
It is absolutely essential that you observe correct polarity in these connections.  
Double check all connections.  
Plug the amplifier’s power cord into the AC power source. Turn the amplifier’s  
power switch ‘on’. The panel light should be illuminated. Leave the preamplifier  
turned off. Before proceeding to the next step turn the amplifier off and wait 30  
seconds for the amplifier to discharge. Both the preamplifier and amplifier  
should be off.  
Connect a playback unit (CD, VLD, Tuner, etc...) to the preamplifier. Turn the  
volume on the preamplifier to minimum. Turn on the preamplifier, then the  
amplifier (in that order). Set source on the preamplifier to the playback unit  
you’ve just connected. Turn volume up slowly and music should be heard from  
all channels. If this is not the case, double check your installation.  
Should you encounter any problems that cannot be traced to the source or the  
material being played, consult the “TROUBLESHOOTING” section on page 10.  
Page 9  
 
PROBLEM  
POSSIBLE CAUSE  
POSSIBLE SOLUTION  
No sound  
(‘on’ LED not illuminated)  
1.  
2.  
3.  
Power cord not plugged in. 1.  
Reconnect power cord.  
Power off at AC source.  
AC power inlet fuse blown  
or faulty.  
2.  
3.  
Check AC switch or fuse.  
Check for shorts or  
overloading.  
4.  
Control switch in the wrong 4.  
position.  
Place control switch in  
proper position. (Page 5)  
No sound on some or all  
selected channels (‘on’  
LED illuminated)  
1.  
2.  
3.  
4.  
Speaker leads loose or  
faulty.  
Line stage to amp. cables  
loose. or faulty.  
Source to line stage cables 3.  
loose or faulty.  
Line stage or source not  
correctly selected.  
1.  
2.  
Tighten, repair, or  
replace cable.  
Tighten, repair or replace  
cable.  
Tighten, repair or replace  
cable.  
Check all switch settings.  
4.  
Sound lacks direction,  
bass weak  
1.  
Speakers connected out of 1.  
phase.  
Check connections  
making sure that cables  
are connected (+) to (+)  
and (-) to (-).  
Loud hum or buzz on one  
or more channels  
1.  
1.  
Poor ground connection in  
interconnect cables.  
1.  
1.  
Check all connectors and  
repair as necessary.  
Low output from amplifier  
Balanced switch in  
balanced mode when  
using unbalanced inputs.  
Put balanced switch in  
correct position.  
Channel sounds distorted  
and low in output  
1.  
Blown rail fuse.  
1.  
Replace blown rail fuse  
inside amplifier.  
** Note: If unit continues to blow power inlet fuses,  
have it serviced.  
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 damp cloth to remove any dirt or  
dust that accumulates on it. Do not let any liquid enter the amplifier thru the vents in  
the top cover. You may clean the connectors on the rear panel with isopropyl alcohol  
annually.  
Page 10  
 
Power rating: 8 ohms  
4 ohms  
125 watts @ 1 kHz  
185 watts @ 1 kHz  
Frequency response  
Input sensitivity  
THD (S+N)  
5 Hz - 45 kHz  
1.0 Volts  
0.09 % @ 1 kHz  
Input impedance  
Damping factor  
Current (peak to peak)  
Slew rate  
33.2 k ohms  
100  
30 Amps  
14 V / )sec  
Dynamic headroom  
S/N (A-weighted)  
Voltage gain  
1.0 dB  
95 dB  
28  
Line voltage  
120/220/240 VAC switchable  
17"(w) X 15.5"(d) X 5.75"(h)  
37 lbs  
Dimensions (O.A.)  
Weight  
Power consumption  
680 watts max  
7.5 Amps max current draw  
60 watts @ no input  
Replacement fuses  
Line - 8 Amp/250 Volt Slow Blow  
Rails - 4 Amp/250 Volt Slow Blow  
Page 11  
 
B&K Components Ltd., referred to herein as B&K, warrants your B&K equipment against all defects in  
material and workmanship for a period of five years from the date of purchase. This warranty applies  
only to the original purchaser and only to equipment in normal residential use and service. Defective  
equipment must be returned to B&K, prepaid, accompanied by sufficient payment to cover the cost of  
return shipping and handling, and will be repaired or replaced at the discretion of B&K whose decision  
as to the method of reparation will be final.  
This warranty shall not apply to any equipment which is found to have been improperly installed,  
incorrectly fused, misused, abused, or subjected to harmful elements, used in any way not in  
accordance with instructions supplied with the unit, or to have been modified, repaired or altered in any  
way without the expressed, written consent of B&K. This warranty does not apply to the cabinet, the  
remote controller, or appearance items such as the faceplate, control buttons, or display lenses, nor  
does it cover any expenses incurred in shipping the unit to and from the manufacturer’s service depot.  
No warranty, implied or otherwise created by State law shall extend beyond the terms of this warranty  
and B&K shall not be liable for any incidental or consequential damage arising out of a defect in material  
or workmanship of the unit during the terms of this warranty or thereafter. Some States do not allow the  
exclusion or limitation of incidental or consequential damages and the foregoing exclusions may not  
apply to you.  
This warranty gives you specific legal rights. Your may also have other rights which vary from State to  
State.  
No agent, representative, dealer or employee of B&K has the authority to increase or alter the  
obligations or terms of this warranty.  
B&K Components Ltd.  
No equipment may be returned to B&K Components Ltd. Without a RETURN AUTHORIZATION.  
Should you find it necessary to return equipment to B&K, for any reason, a RETURN AUTHORIZATION  
(RA) number must be issued by B&K in respect of the equipment being returned. You may request an  
RA number by calling B&K at the numbers below. We ask that you provide the following information at  
that time.  
1.  
2.  
3.  
Your name, address, and phone number.  
The model and serial number of the equipment being returned.  
A description of the problem being experienced.  
Your call will be referred to a Technical Service Representative who will work with you to resolve the  
problem. If it is determined that the unit must be returned for repair, an RA number will be issued.  
B&K Components Ltd. 2100 Old Union Road, Buffalo New York 14227  
1-800-543-5252 or 1-716-656-0023  
Page 12  
 
B&K Components, Ltd., 2100 Old Union Road, Buffalo, New York 14227  
 
B&K Components, Ltd.  
2100 Old Union Road  
Buffalo, New York 14227  
716-656-0023  
 

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