BRYSTON
OWNER’S MANUAL
Instructions For Bryston
ST Series Amplifiers
Model 14B ST
GENERAL INSTRUCTIONS
Warranty Information:
Thank you for choosing a Bryston product. We
welcome any suggestions you may have, or
comments regarding the operation of your amplifier. We consider you, our customer, to be
Brystons’ most important resource, and your
opinion is very much appreciated.
Bryston products are warranted to be free from
manufacturing defects for a minimum of 20,
(twenty), years from the original date of manufacture. This includes all parts, labor and oneway return shipping. This warranty covers the
original owner and any subsequent owners. The
warranty is retroactive for any Bryston product
purchased within the last twenty years.
Bryston 14B- ST Amplifier Description:
The Bryston 14B-ST is a Stereo 2-channel
power amplifier consisting of two totally independent amplifier modules, each with its own
power transformer and +/-60V power supply.
Tampering by anyone other than factory authorized personnel voids the warranty. Warranty
service may be obtained by returning the unit to
any authorized Bryston dealer or distributor.
You may also contact the Bryston factory or national service offices directly at the location
listed on the rear page of this manual.
Please keep the original box and all packing
material. This will ensure the amplifier is protected in the unlikely event you have a problem
and must return it for service. No warranty card
is necessary to initiate your coverage. Please
refer to the back page for more detailed warranty information.
Each audio channel provides connections for
balanced or single ended input and will supply a minimum of 500 watts of power into 8
ohms or 800 watts into 4 ohms.
Installation Setup And Recommendations:
CAUTION: Your 14B ST is a Stereo Amplifier
only and the outputs should never be connected in Series/Bridged or Parallel modes.
Make Sure The Circuit Breaker Switch Is OFF
Until All Connections Are Made.
Power Switch(s): There are two power switches
on the 14B. The front panel ‘ST’ Power Switch
and the rear panel On/Off Circuit Breaker.
The 14B has two, 2-position slide- switches labeled
Power Up and Ext Trig and 1-Circuit Breaker
Factory Settings are:
POWER UP – LOCAL,
EXTERNAL TRIGGER – LOCAL,
CIRCUIT BREAKER SWITCH – OFF
PLEASE REFER TO: ‘BRYSTON’S SAFETY MANUAL’ FOR FURTHER OPERATING INSTRUCTIONS.
After confirming that all switches are in the proper
positions and all input and output connections are
correctly made, plug the amplifier into the proper
wall outlet and activate the circuit breaker switch.
The power amplified may now be turn on or off using the front panel ‘ST’ power switch.
If the rear panel power-up switch is in the ‘Local’
position and the amplifier is connected to the A/C
power source the amplifier will turn on/off using the
front panel ‘ST’ power switch. If for any reason the
power is removed from the A/C line (ex: power failure) the amplifier will turn off and will not turn on
again after A/C is restored until the front panel
‘ST’ power switch is manually reactivated.
When the rear panel power-up switch is in the
‘Auto’ position then any time A/C power is supplied (Power Bar, Switched power outlet etc.) the 14B
will automatically power-up without having to activate the ‘ST’ power switch.
BRYSTON 14B ST MANUAL
14B ST Rear Panel Connections:
Input:
The 14B ST has two inputs per channel, one
for a balanced source, and one for single
ended or unbalanced source. The BAL input
connector will accept either a 3 pin ‘XLR’ type
or a 1/4” Tip/Ring/Sleeve type. The positive (+)
terminal is pin 2 on the ‘XLR’ and tip on the
TRS. The input impedance is 15K ohms. The
input pins are gold plated. Input sensitivity is
selectable using the ‘INPUT’ slide switch. In the
‘BAL REG’ position 2 Volts in = 100 Watts at 8
ohms output. This is the recommended setting
when using Bryston preamplifiers or any pre-
Balanced Vs Unbalanced:
Balanced cable interconnects should be used
whenever possible, as they provide common
mode noise protection from external electrical
interference, and with active balanced outputs a 6 dB higher signal level flows in the cable.
The unbalanced cable interconnect is provided for preamplifiers without balanced output. Unbalanced cables should be kept to 10
feet or less. Never use longer cables than
necessary, never coil excess cable length,
and run signal wires away from and never
parallel to A/C power or speaker cables.
Output:
Gold plated output binding posts provide different interconnect options. Stripped bare
wire up to 3 Ga. can be passed through the
hole in the binding post and held in place by
tightening the post knob. Additional tightening
pressure can be achieved using a coin in the
slots of the knob. Wire terminated with banana plugs, spade lugs, or pins are also accommodated by the binding posts. Please observe correct polarity (Red/Black) when making these connections. We recommend gold
plated connectors to prevent corrosion and
amplifier having active balanced outputs. This
setting also produces the lowest amplifier noise
floor. The ‘BAL+6dB’ setting adds 6 dB of gain
to provide an input sensitivity of 1 Volt in = 100
Watts at 8 ohms output. This setting is primarily for balanced outputs that are transformer
coupled, or other low level sources.
The ‘UNBAL’ setting selects the gold plated
‘RCA’ type tip/sleeve connector. The input impedance is 50K ohms. The output is in phase
with the input and the sensitivity is 1 Volt in for
100 Watts into 8 ohms output.
signal distortion. (Bryston has gold plated
5/16 inch spade lugs available). Speaker wire
should be kept as short as practical and
should never be terminated with connectors
that may become confused with A/C power
connectors. Speaker cables should be
dressed away from input and power cables,
and even each other when runs are long.
Remote Power Control:
You can turn the power amplifier on/off using
a 4 -12 volt A/C or D/C voltage using the 4
position screw terminal connector (see rear
panel diagram page 4). Insert the 4 -12 volt
wire into the input labeled ‘IN’ (polarity is not
important) and then place the ‘Ext
Trig’ (external trigger) switch into the
‘Rem’ (remote) position. The power amplifier
will now power on and off when the control
voltage is applied or removed.
The connector positions labeled ‘OUT’ can be
used to power another amplifier in sequence.
The 4/12 volt control voltage does not appear
at the ‘OUT’ terminals until after the 14B has
completely powered up so this allows sequencing of your power amps without large
turn-on surges.
WHEN THE ‘EXT TRIG’ IS IN THE ‘LOCAL’ POSITION THE 14B WILL IGNORE THE 4/12
CONTROL VOLTAGE AND WILL POWER-UP ONLY WITH THE MANUALLY ACTIVATED
FRONT PANEL ‘ST’ POWER SWITCH.
Page 3
BRYSTON 14B ST MANUAL
Clipping Indicators:
The 14B uses tricolor LEDs with green indicating power on, flashing red indicating actual
overload or distortion and yellow/orange indicating thermal shutdown. Upon power-up the
14B’s LED’s will remain “red” until all voltages
stabilize and the unit comes out of mute and the
LED turns green.
If the LED indicator contains a substantial red
content, when program is present, it should be
considered as a sign that the level is too high
and may cause speaker damage if it continues.
It should be remembered that the Bryston ST
series are powerful amplifiers, and that it is possible to damage almost any speaker if an ampli-
Bryston 14B ST Back Panel:
fier is used in a thoughtless or abusive manner.
Bryston will not be responsible for speaker damage caused in this manner.
The clip-sensing circuit uses an AC comparator
to detect any source of signal distortion including clipping, short circuits in cabling, excessive
DC or supersonic signals, whether at the input
or output. Most conditions which could cause
the red LED to light for more than a moment or
two can be dangerous to your loudspeakers
and should be corrected immediately.
If a specific LED remains ‘yellow/orange’ without signal present,
it may indicate a thermal shutdown condition and the channel
will remain inoperative until safe operating temperatures return.
Page 4
BRYSTON 14B ST MANUAL
SPECIAL INSTRUCTIONS FEATURES AND SPECIFICATIONS:
Maximum continuous output power with both channels driven can only be realized
on a 120 Volt 20 Amp or 230 Volt 10 Amp version of the 14B ST
Music is a “Dynamic and Transient” condition and the power requirements fluctuate
up and down over time with the audio signal. Therefore, under most listening conditions the 15Amp/120 Volt version will be all
that is required for the majority of domestic audio/video systems.
14B-120-Volt 15 Amp Version:
Power rating: 500 Watts into 8 Ω
800 Watts into 4 Ω
Input impedance:
balanced 15 k Ω
unbalanced 50 k Ω
Sensitivity:
bal input reg 2 Volt in = 100 Watts / 8 Ω
bal input +6 1 Volt in = 100 Watts / 8 Ω
unbal 1 volt in = 100 Watts / 8 Ω
14B-120-Volt 20 Amp Version:
Power rating: 500 Watts into 8 Ω
800 Watts into 4 Ω
Input impedance:
balanced 15 k Ω
unbalanced 50 k Ω
Sensitivity:
bal input reg 2 Volt in = 100 Watts / 8 Ω
bal input +6 1 Volt in = 100 Watts / 8 Ω
unbal 1 volt in = 100 Watts / 8 Ω
If more power is required, then a 14B - 20
Amp version is also available. You must
have a minimum of 12 Gauge household
electrical wire and a dedicated 20 Amp
wall plug in order to utilize this feature.
The other option available is to wire for a
240 Volt 10 Amp service and use the 230
Volt 10 Amp European model.
Distortion:
Thd + N .005% 20Hz to 20kHz at 500 watts /8 ohms
IMD .005% 60 Hz + 7kHz mixed 4 to 1
Noise – 115db 20Hz to 22kHz bandpass
Current consumption:
Both channels at full power with 8 ohm loads = 19.1A.
Both channels at full power with 4 ohm loads = 30.7A.
Both channels idle = 1.3 Amps
Distortion:
Thd + N .005% 20Hz to 20kHz at 500 watts /8 ohms
IMD .005% 60 Hz + 7kHz mixed 4 to 1
Noise – 115db 20Hz to 22kHz bandpass
Current consumption:
Both channels at full power with 8 ohm loads = 19.1A.
Both channels at full power with 4 ohm loads = 30.7A.
Both channels idle = 1.3 Amps
14B-230-Volt 10 Amp Version
Power rating: 500 Watts into 8 Ω
800 Watts into 4 Ω
Input impedance:
balanced 15 k Ω
unbalanced 50 k Ω
Sensitivity:
bal input reg 2 Volt in = 100 Watts / 8 Ω
bal input +6 1 Volt in = 100 Watts / 8 Ω
unbal 1 volt in = 100 Watts / 8 Ω
Distortion:
Thd + N .005% 20Hz to 20kHz at 500 watts /8 ohms
IMD .005% 60 Hz + 7kHz mixed 4 to 1
Noise – 115db 20Hz to 22kHz bandpass
Current consumption:
Both channels at full power with 8 ohm loads = 9.5A.
Both channels at full power with 4 ohm loads = 15.3A.
Both channels idle = 1.3 Amps.
Note: Continuous 2 channel power is limited by specific circuit breaker limitations.
Page 5
BRYSTON 20 -YEAR WARRANTY
Bryston products are warranted to be free from
manufacturing defects for a minimum of twenty
years from the original date of manufacture. This
includes parts, labour and return shipping to the
first owner and all subsequent owners. Warranty
coverage is automatic and commences with the
original date of manufacture which is kept on file
at Bryston.
In the event of a defect or malfunction, Bryston
will remedy the problem by repair or replacement,
as we deem necessary, to restore the product to
full performance.
This warranty is considered void if the defect,
malfunction or failure of the product or any
component part was caused by damage ( not
resulting from a defect or malfunction ) or abuse
while
in the possession of the customer. Tampering by
persons other than factory authorized service
personnel, or failure to fully comply with Bryston
operating instructions, voids the warranty.
This warranty gives you specific legal rights and
you may also have other rights which may vary
from province to province and country to
country.
BRYSTON SERVICE CANADA:
24 STEINWAY BLVD., UNIT 48
ETOBICOKE, ONTARIO
CANADA M9W 6T8
PHONE: 416-675-2585
FAX: 416-675-3103
BRYSTON SERVICE OUTSIDE NORTH AMERICA:
P.O. BOX 2170, 677 NEALDRIVE
BRYSTON LTD.
PETERBOROUGH, ONTARIO
CANADA K9J 7Y4
PHONE: 705-742-5325
FAX: 705-742-0882
CONTACT YOUR LOCAL DISTRIBUTOR
OR
CONTACT BRYSTON DIRECTLY
OR
www.bryston.ca
BRYSTON SERVICE U.S.A.:
30 COVENTRY ST.
NEWPORT, VERMONT.
U.S.A. 05855
PHONE: 802- 334-1201
FAX: 802-334-6658
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