BRYSTON 3B-3 PRO (19"") Black 3B3 and 4B3 Owner's Manual-2016-03-09.pdf

3B3 & 4B3 Amplifier

Owner’s Manual

Important Safety Instructions

The lightning flash with arrowhead symbol within an equilateral triangle, is

intended to alert the user to the presence of un-insulated “dangerous volt­age “ within the product’s enclosure that may be of sufficient magnitude to constitute
a risk of electric shock to persons.

The exclamation point within an equilateral triangle is intended to alert the user
to the presence of important operating and maintenance (servicing) instructions

in the literature accompanying the product.

1. Read these instructions.

2. Keep these instructions.

3. Heed all warnings.

4. Follow all instructions.

5. Do not use this apparatus near water.

6. Clean only with dry cloth.

7. Do not block any ventilation openings. Install in accordance with the

manufacturer’s instructions.

8. Do not install near any heat sources such as radiators, heat registers, stoves, or

other apparatus (including amplifiers) that produce heat.

9. Do not defeat the safety purpose of the polarized or grounding-type plug. A

polarized plug has two blades with one wider than the other. A grounding type
plug has two blades and a third grounding prong. The wide blade or the third
prong are provided for your safety. If the provided plug does not fit into your
outlet, consult an electrician for replacement of the obsolete outlet.

10. Protect the power cord from being walked on or pinched particularly at plugs,

convenience receptacles, and the point where they exit from the apparatus.

11. Only use attachments/accessories specified by the manufacturer.

12. Use only with the cart, stand, tripod, bracket, or table specified by the
manufacturer, or sold with the apparatus. When a cart is used use
caution when moving the cart/apparatus combination to avoid injury
from tip-over.

13 Any terminals marked with the preceding symbol are HAZARDOUS
LIVE and any wiring connected to these terminals must be installed
by an INSTRUCTED PERSON or with ready-made leads or cords.

14. Unplug this apparatus during lightning storms or when unused for long periods of

time.

15. Refer all servicing to qualified service personnel. Servicing is required when the

apparatus has been damaged in any way, such as power-supply cord or plug is
damaged, liquid has been spilled or objects have fallen into the apparatus, the
apparatus has been exposed to rain or moisture, does not operate normally, or has

been dropped.
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS
APPARATUS TO RAIN OR MOISTURE. DO NOT EXPOSE THIS EQUIPMENT TO DRIPPING OR
SPLASHING AND ENSURE THAT NO OBJECTS FILLED WITH LIQUIDS, SUCH AS VASES, ARE
PLACED ON THE EQUIPMENT. TO COMPLETELY DISCONNECT THIS EQUIPMENT FROM THE AC
MAINS, DISCONNECT THE POWER SUPPLY CORD PLUG FROM THE AC RECEPTACLE.
THE MAINS PLUG OF THE POWER SUPPLY CORD SHALL REMAIN READILY OPERABLE.

BRYSTON LIMITED WARRANTY

Bryston analog audio products are warranted to be free from manufacturing defects for twenty (20) years from the original date of manufacture. The warranty includes parts and labour.
Bryston digital products and cables are warranted for five years from the original date of manufacture. The warranty includes parts and labour.
Bryston products having motorized moving parts, excluding motorized volume controls, are warranted for three years from the original date of manufacture. The warranty includes parts
and labour.
Bryston will remedy the problem by repair or replacement, as we deem necessary, to restore the product to full performance. Bryston will pay return shipping only for the full length of
the specific product's warranty.
In the event of a defect or malfunction, contact Bryston’s repair centers for return authorization. Products must be returned using original packaging material only. Packing material may
be purchased from Bryston if necessary. 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.
As of 2006-02-22 Bryston will only warranty Bryston products purchased through authorized Bryston dealers. Bryston products with a date code of 0608 or higher (date code format is
“yyww”, where “yy” is the two least significant digits of the year and “ww” is the week of the year) must be accompanied by a copy of the bill-of-sale from a Bryston authorized dealer to
qualify for warranty service. The warranty is transferable from the original owner to a subsequent owner as long as a copy of the bill-of-sale from the original authorized Bryston dealer
accompanies the re-sale. The copy of the bill of sale to any subsequent owner need ONLY include the Name of the Bryston Authorized Dealer and the Model and Serial number of the
Bryston product The warranty will only be honored in the country of the original purchase unless otherwise pre-authorized by Bryston.

BRYSTON SERVICE in CANADA: BRYSTON SERVICE in the USA:

Postal address: P.O. BOX 2170, Stn. Main
PETERBOROUGH, ONTARIO
CANADA K9J 7Y4

Courier address: 677 NEAL DRIVE
PETERBOROUGH, ONTARIO
CANADA K9J 6X7

PHONE: [phone]
FAX: [phone]
E-mail: [e-mail]

79 COVENTRY ST., Suite 5
NEWPORT, VERMONT
U.S.A. 05855-2100

PHONE: [phone]
FAX: [phone]
E-mail: [e-mail]

BRYSTON SERVICE outside Canada and the USA:

contact your local distributor or

CHECK OUR WEB SITE: www.bryston.com
E-MAIL BRYSTON DIRECTLY: [e-mail]
FAX BRYSTON DIRECTLY: 01-705-742-0882
PHONE BRYSTON DIRECTLY: 01-705-742-5325

Table of Contents

Important Safety Instructions ....................................2

General.........................................................................3

Welcome ................................................................3

Description ............................................................3

Features .................................................................3

Shipping Box and Packing Material ...................... 3

Installation and Usage ................................................4

Ventilation .............................................................4

Connecting to A/C Power ...................................... 4

Connecting to Loudspeakers: 2 Channel Mode ... 4

Connecting Audio Inputs ......................................4

Balanced vs. Single Ended Input .......................... 5

Power Conditioners ..............................................5

External Control Voltage ....................................... 5

Connecting to Loudspeakers: Bridged Mode ....... 6

Front Panel ..................................................................7

Rear Panel .................................................................... 8

3B3 Specications ...................................................... 10

4B3 Specications ...................................................... 10

Dimensions ................................................................ 11

General

Welcome

Thank you for your purchase of a Bryston 3B3
or 4B3 (Cubed) amplifier! Decades of ongoing
research and development have produced our
highest performing amplifiers yet. Our customers
are a tremendous resource to whom we look for a
measure of success. Please feel welcome to contact
us with feedback and suggestions.

Description

The 3B3 and 4B3 are dual mono design audio power
amplifiers with two channels capable of 200 watts
and 300 watts each respectively intended for use
in very high performance professional audio
systems. Robust yet beautiful machined aluminum
enclosures house our proprietary industry-leading
circuit designs resulting in exemplary performance
observed both in the listening space and in the
laboratory.

C-Series variants are available in your choice of 17
inch or 19 inch wide non-rack mountable aluminum
dress panels anodized in clear (silver toned) or
black. Nineteen inch wide C-Series amplifiers
include front mounted handles. PRO amplifiers

feature 19 inch wide rack mountable dress panels
with a black anodized front finish and also include
individual channel trims located on the rear panel.

Features

Bryston 3B3 and 4B3 include the following features:

• Switchable gain: 23dB or 29dB

• Balanced (XLR or TRS) input. Pin 2 positive.

• Single ended (RCA) input.

• SoStart circuitry for managing inrush current
upon initial power up.

• Wired remote control AC/DC trigger input and
passthrough with supplied connector.

• Bridged output mode available.

Shipping Box and Packing Material

Please keep the original shipping box and all
packing material. This will ensure the amplifier is
protected in future transport. In the unlikely event
you have a problem and must return it for service,
you must use the proper packing material. Ship
the amplifier only in the original packing material,
as the unit is not insurable by carriers otherwise.
Replacement packing materials consisting of a
shipping carton with plastic foam inserts is available
from Bryston for a small fee.

Installation and Usage

the following instructions.

Ventilation

Bryston has deliberately chosen to omit fans from
our amplifiers in an eort to minimize the noise
level in your listening environment. Instead, we use
only passive heat sinks which are fully capable of
maintaining a safe operating temperature of the
amplifier even under loud playback conditions. For
them to work most eectively, air must be
permitted to pass freely through the heat sink fins
and around the amplifier. Maintain a minimum of

3.5 inches of space to each side, top and back of the
amplifier when in use. Do not stack the amplifiers
immediately on top of one another in an enclosed
cabinet. If you must stack the amps, you may need
to utilize fans or another active cooling mechanism
to ensure uninterrupted operation. If you repeatedly
experience channels shutting down due to heat,
rearrange the amplifiers to have more surrounding
free space, or employ an active cooling solution.

Heat sinks may be up to 85° Celsius! Take
caution to prevent burns! Never operate the

amplier in a vertical position.

Connecting to A/C Power

Please check the Data Plate on the right rear of the
amplifier to verify power requirements agree with
your location. See “12. Data Plate:” on page 9.
Before plugging in the power cord, make sure the
Master Circuit Breaker (“8. Master Circuit Breaker:”
on page 9) is switched to the ‘ON’ position. Plug
the IEC-320 C14 end of the power cord into the
amplifier, then plug the other end into an approved
and grounded A/C receptacle. The STATUS LED
should flash green, then switch to red indicating A/C
power is present in the unit. See “11. Power Status
Indicator:” on page 9. The amplifier is now ready
to be powered on.

Connecting to Loudspeakers:
2 Channel Mode

Connection to loudspeakers is accomplished by
attaching high quality speaker cable to the Output
Binding Posts (see “Rear Panel” on page 8) per

The RED binding post is connected to the channel
output. Connect this post to the (+) terminal on the
loudspeaker.

The BLACK binding post is connected to signal
ground. Connect this post to the (-) terminal on the
loudspeaker.

The output binding posts provide three dierent
interconnect options. Combinations may be used
when bi-wiring. Cables should be kept as short
as practical and should never be terminated with
connectors that may become confused for AC
power connectors. Cables should be dressed away
from input and power cables.

Banana plugs oer a quick disconnect option.
Before inserting a banana plug into the binding
post, be sure to tighten the post nut to avoid rattling
and to provide full insertion of the banana plug.
Gold plated locking banana plugs are available from
Bryston.

Spade lugs provide high contact area and secure
fastening. Lugs should be gold
plated. Post diameter is 5/16”
(8mm ), lug width 5/8” (16 mm).
Gold plated spade lugs are
available from Bryston.

Stripped bare wire up to 3 gauge can be inserted
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. Do not over tighten or the
binding post may become damaged. Note that
copper wire is malleable and may require further
tightening aer the initial installation.

To prevent the risk of equipment damage or
personal harm, use only Class 2 rated loudspeaker
wire properly terminated and connected securely to
the binding posts.

4

4B3 & 3B3 Amplifiers

Connecting Audio Inputs

The Bryston Cubed amplifier can receive analog
audio from any preamp or surround processor with
volume controlled line-level outputs. Balanced XLR
and TRS as well as singled ended RCA inputs are
both available and can be selected using the Input
Select switch on the rear panel of the amplifier.

Balanced vs. Single Ended Input

The balanced input requires a balanced pre-amp
source. Balanced systems provide noise rejection
from external electrical interference, so cable
length can be very long—50 meters or longer. The
single ended or unbalanced input is provided for
pre-amps without balanced output. Single-ended
cables should be kept to 20 feet (6 meters) or less.
In general never use longer cables than necessary,
never coil excess cable length, and keep signal wires
away from AC power or speaker cables.

Power Conditioners

Bryston urges caution in choosing a power
conditioner for your audio/video system. Large
power amplifiers can draw very substantial current
from the wall plug, and many so-called power
conditioners can in fact hinder the supply of current
by inserting resistances in series with the line cord.
However, there are now power conditioners that
can reduce or eliminate RF and ‘hash’ from the AC
supply and may actually improve current delivery
to your system. This type of power conditioner
(exemplified by Bryston BIT products) uses the
energy storage in a large toroidal transformer to
provide high instantaneous power and reduce
the substantial AC output resistance of the wall
socket and house wiring. This resistance can be in
the range of 0.5 to 1 Ohm and is typically reduced
to only a few milliohms by the power conditioner.
That in turn considerably reduces voltage drop in
the power line on high current surges and quite
substantially increases the stability of the power line
improving audio (and video) focus, precision and
clarity.

External Control Voltage

To power-up the amplifier using an external control
voltage, supply a 5V to 12V (AC or DC) control
voltage to the ‘IN’ terminals of connector (g. 1). Use
paired wire of 22 to 18 gauge between the source
device and the Bryston Cubed series amplifier. The
appropriate mating connector is supplied with each
amplifier.

Set the External Turn-On switch to “External” See
“10. Remote Power Up:” on page 9. Place the
front panel switch in the ON position. The amplifier
will now power-up only when the control voltage is
present (on). Immediately following power-up, the
control voltage will appear at the ’OUT’ terminals
of connector for the control of other equipment.
The removal of the control voltage (0v) causes the
amplifier to turn ‘o’, and the control voltage at the
‘OUT’ terminals is interrupted.

In the “Local” setting of the External Turn-On switch
the amplifier will ignore the control voltage and
power up only by using the front panel push-button
power switch. If a control voltage is present at the
‘IN’ terminals, it will still be available at the ‘OUT’
terminals aer the power-up sequence.

Note:

The ‘OUT’ terminals are connected to the ‘IN’
terminals once the amplifier has powered-up.
The control current is determined by the source
equipment. The carrying current of the ‘OUT’ relay
is 2 amps. The amplifier’s control circuitry itself
draws less than 2 mA from the control current when
operating.

REMOTE POWER TURN-ON

PLUG-IN CONNECTOR

Insert stripped ends of insulated wires revealing
approx. 1/4" of bare, stranded copper wire between
24 and 12 AWG (.5mm to 2mm dia.) into open elevator
style wire clamps & tighten with a slot screw driver.
Do not over tighten or wires may eventually come
lose. Maximum tightening torque is 4.5 lb-in (0.5Nm)

Figure 1

5

Connecting to Loudspeakers:

O

N

F

F

O

o

I

Bridged Mode

“Bridged mode” connects the individual channels
in series to form a single amplifier channel. The
primary reason for doing this is to achieve a single
amplifier channel with much greater output power.
When two 3B3 channels or two 4B3 channels are
bridged, the combined single channel will output
up to two times the original voltage and therefore,
theoretically, four times the power of a single
individual channel. In practice, the actual output
power achieved is limited by the capability of the
power supply as well as the ability of the amplifier
to dissipate the increased heat that is generated.
It should noted that the usual minimum load
connected to a pair of bridged 3B3 or 4B3 channels
should be greater than or equal to 8 Ohms.

To prevent the risk of equipment damage or
personal harm, use only Class 2 rated loudspeaker
wire properly terminated and connected securely to
the binding posts.

Connections are only to be made in areas
highlighted in the diagram below.

• Only Channel #1 input is used.

• The input can be either balanced or un-

balanced.

• Only the two RED binding post connectors

are used (i.e. the BLACK ones are NOT used
and must have nothing connected).

• The Channel 1 RED binding post is the

positive polarity and connected to (+) on
the loudspeaker. Channel 2 RED binding
post connector is negative polarity and
connected to (-) on the loudspeaker.

• The bridged output is floating with respect

to ground. DO NOT CONNECT EITHER
OUTPUT TERMINAL TO GROUND.

• To engage bridged mode, place the MODE

switch, located on the rear panel, into the
BRIDGED position, but before doing so,
make sure all input and output connections
are correct for bridged mode operation.

CAN ICES-3 (B)/NMB-3(B)
This device complies with FCC
Part 15, subpart B

CAUTION

CAUTION

RISK OF ELECTRIC SHOCK - DO NOT OPEN

PRECAUTION

ATTENTION

RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR

300W INTO 8Ω

WARNING
RISK OF HAZARDOUS
ENERGY. MAKE PROPER
SPEAKER CONNECTIONS.
USE CLASS 2 WIRING.

AVERTISSEMENT
RISQUE DE ÉNERGIE
DANGEREUSE. FAIRE
CONNECTIONS ENCEINTE
ADÉQUAT. UTILISATION
CÂBLAGE DE CLASSE 2.

Speaker (-)

2

BALAN CED

SINGLE ENDED

INDIVIDUAL

Terminal

2 1

+

G

3

1

3

MAINS SWITCH & BREAKER

_

GAIN

29 dB

IN DIVI DUA L

23 dB

BR IDGE D

LEVE L

BRIDGED

-

(8Ω minimum load)

IEC-320 C14 POWER INLET

+

INPUTSMODE

BALANCED

SINGLE
ENDED

LEVE L

REMOTE POWER-UP

EXTERNAL

LOCAL

_

+

G

2

1

3

BALANC ED

SING LE ENDED

OUT

IN

STATUS

Speaker (+)
Terminal

From Pre-Amp

PETERBOROUGH, ONTARIO, CANADA

MADE IN/FABRIQUE AU CANADA

Model Number
Data Sticker

3

00W INTO 8Ω

INDIVIDUAL

--

++

WARNING
RISK OF HAZARDOUS
ENERGY. MAKE PROPER
SPEAKER CONNECTIONS.
USE CLASS 2 WIRING.

AVERTISSEMENT
RISQUE DE ÉNERGIE
DANGEREUSE. FAIRE
CONNECTIONS ENCEINTE
ADÉQUAT. UTILISATION
CÂBLAGE DE CLASSE 2.

6

4B3 & 3B3 Amplifiers

1 2

Front Panel

1. Power/Standby Switch:

The front panel features a push-on/push-o
type latching power switch used to apply or
remove A/C line power to the SoStart circuitry.
Note that the rear circuit breaker must be on for
the amplifier to power-up.

2. LED Indicators:

Each amplifier channel has an LED indicator to
monitor the following conditions:

Unlit Amplifier not powered on (OFF

MODE)

Red Channel is muted during power up

Green Channel operation is normal

Flashing

Orange Thermal protection mode

POWER UP SEQUENCE

Aer pushing the power switch, each channel
LED will turn from unlit to red (mute). When the
power supplies have stabilized, the channel will
come out of mute and the LED will change to
green (normal operation).

Channel is clipping. Reduce input

Red

level!

CLIPPING (flashing red)

Clipping occurs when the channel output level
no longer can follow the level increase at the
input (over driven input condition). When a
channel is driven into clipping, the channel
LED will change from green to red then back to
green when the level is reduced. Momentary
clipping can be tolerated, however it indicates
that maximum undistorted power has been
surpassed and potential speaker damage
may result if overload conditions persist. Any
amplifier that is constantly operated into
clipping indicates a more powerful amplifier is
needed for that application.

THERMAL SHUTDOWN (orange)

Each channel has thermal shutdown circuitry
to prevent damage due to overheating. Should
thermal shutdown occur, the channel will mute,
and the channel LED will turn orange. When
the channel has cooled to a safe operating
condition, the channel will return to normal
operation. Persistent thermal shutdown
indicates steps need to be taken to increase
airflow across the channel or channels heat
sink. See “Ventilation” on page 4.

UNLIT LED (No power)

The amplifier channel LED when unlit indicates
no A/C mains power is present at the channel
power transformer. If both channel LEDs are
unlit, the amplifier probably needs only to be
powered on.

In some markets the LED indicators, which are
normally red/green, may be red/blue instead.
When red/blue LEDs are supplied green is
replaced with blue and orange is replaced with
magenta in the above descriptions.

7

O

O

O

O

O

O

O

O

O

O

O

O

O

O

O

O

O

O

O

N

N

N

N

N

N

N

N

F

F

O

o

III

12 3 1254

CAN ICES-3 (B)/NMB-3(B)
This device complies with FCC
Part 15, subpart B

CAUTION

CAUTION

RISK OF ELECTRIC SHOCK - DO NOT OPEN

PRECAUTION

ATTENTION

RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR

300W INTO 8Ω

WARNING
RISK OF HAZARDOUS
ENERGY. MAKE PROPER
SPEAKER CONNECTIONS.
USE CLASS 2 WIRING.

AVERTISSEMENT
RISQUE DE ÉNERGIE
DANGEREUSE. FAIRE
CONNECTIONS ENCEINTE
ADÉQUAT. UTILISATION
CÂBLAGE DE CLASSE 2.

INDIVIDUAL

2

3

BALA NCED

SINGLE ENDED

MAINS SWITCH & BREAKER

2 1

+

1

3

_

Rear Panel

1. Input Select Switch:

Select either Balanced or Single Ended audio
input.

GAIN

29 dB

IN DIVI DUA L

G

23 dB

LEVE L

BR IDGE D

BRIDGED

-

(8Ω minimum load)

IEC-320 C14 POWER INLET

+

INPUTSMODE

BALANCED

SINGLE

ENDED

LEVE L

REMOTE POWER-UP

EXTERNAL

LOCAL

6 78 9 10 11

single-ended or from a transformer coupled
balanced source. This is the typical for single
ended or un-balanced operation. The 29dB
setting provides the most amplifier gain and
equates to 100w @ 8 ohms output for a 1V input.

OUT

_

+

G

2

1

IN

3

BALANC ED

SING LE ENDED

STATUS

PETERBOROUGH, ONTARIO, CANADA

MADE IN/FABRIQUE AU CANADA

Model Number
Data Sticker

3

00W INTO 8Ω

INDIVIDUAL

--

++

WARNING
RISK OF HAZARDOUS
ENERGY. MAKE PROPER
SPEAKER CONNECTIONS.
USE CLASS 2 WIRING.

AVERTISSEMENT
RISQUE DE ÉNERGIE
DANGEREUSE. FAIRE
CONNECTIONS ENCEINTE
ADÉQUAT. UTILISATION
CÂBLAGE DE CLASSE 2.

2. Balanced Audio Input:

This input connector accepts standard XLR (pin
1 = Ground, pin 2 = Positive, pin 3 = Negative) or
1/4” Phone plugs (sleeve = Ground, tip = Positive,
ring = Negative). Use quality, 100% shielded
cables with gold plated connectors.

3. Single Ended Audio Input:

This input connector accepts standard ‘RCA’ or
‘Phono’ connectors. Use quality, 100% shielded
cables with gold plated connectors.

4. Gain Select Switch:

The optimum gain setting will depend upon the
source pre-amp operating level, and or personal
preference.

The 29dB setting is used when the source is

8

The 23dB setting is used when the source
output is actively balanced. This is the typical
setting for balanced operation. Or use this
setting whenever less gain is required. The 23dB
setting equates to an output of 100w @ 8 ohms
for 2V input.

The noise is referenced in dB below rated
output. Dierent input configurations result
in slightly dierent noise readings. The above
noise ratings represent minimum readings.
Actual readings may be better.

5. Mode Switch:

The individual setting is for two channel
operation. Bridged mode is for single channel
op eration . See “Bridged Mode” on page 6.

4B3 & 3B3 Amplifiers

6. Channel Level Attenuators (PRO
ONLY):

The level control will attenuate the input signal
level from 0dB through -14dB.

7. Output Binding Posts:

The RED binding post is connected to the
amplifier output. Connect to this post the (+)
terminal on the loudspeaker for normal (non­bridged or individual) operation.

The BLACK binding post is connected to signal
ground. Connect to this post the (-) terminal
on the loudspeaker for normal (non-bridged or
individual) operation.

Only use Class 2 Rated Wiring. No other wiring is
permitted for use.

The output binding posts provide three dierent
interconnect options: banana plugs, spade lugs,
and bare wire. Combinations may be used when
bi-wiring. Cables should be kept as short as
practical and should never be terminated with
connectors that may become confused for AC
power connectors. Cables should be dressed
away from input and power cables.

8. Master Circuit Breaker:

The Cubed series amplifier uses a magnetic­trip circuit breaker to protect the amplifier.
This breaker is not an on o switch and must
be in the ‘ON’ position during the installation
and normal operation. Use the front panel
push-button power switch or an external
control voltage to power-up or power-down
the amplifier. Should the breaker trip, or switch
“OFF”, lower or remove the amplifier input
signals. Remove the AC power by disconnecting
the power cord from the amplifier for 20
seconds. Switch the breaker to the ‘ON’ position.
Reconnect the power cord, then power the unit
up normally. The circuit breaker must be ‘ON’
at all times for the Cubed Series amplifier to
operate.

9. A/C Power Input:

An IEC-320 C14 power inlet provides for
connection of an IEC-320 C13 equipped power
cord. Before connecting the power cord to the
amplifier, check that the voltage rating on the
data plate or ratings label conforms with your
locality. With the circuit breaker ‘ON’ insert the
power cord into the Cubed series amplifier, then
plug the other end to an appropriate A/C power
outlet.

10. Remote Power Up:

When in External position, the Power On state
is governed by voltage applied to IN terminals
of the Remote Power Up connector. The front
panel power switch must remain in the ‘ON’
position. “External Control Voltage” on page
5 for instructions regarding connection and
usage.

11. Power Status Indicator:

Plugging in the power cord applies power to
the amplifier. The status indicator will initially
flash green. The number of flashes indicates the
revision of the so start circuit soware. This
puts the amplifier in Standby mode and the LED
turns red indicating power is present.

Engaging the front panel on/o switch initializes
the startup sequence. During the so start ramp
up, operation the status led will turn orange
when connected to 60Hz power or red when
connected to 50Hz power. The Status LED
switches to green when the ramp up sequence
ends. Turning o the front panel on/o switch
returns the amplifier to the Standby mode.

12. Data Plate:

Unit specific information is printed here
including model number, operating voltage,
frequency, and serial number.

4B3-17-SIL-120
~120V 60Hz 1000W
Serial No: 4B3-000000
Date: 1530 REV: 1234

9

3B3 Specifications

4B3 Specifications

Power Output

Per Channel

(Watts)

Gain High: 29dB

Sensitivity

(into 8Ω)

Input

Impedance

IMD ≤0.005%, Typ. ≤0.002%

THD+N 20Hz-20kHz @ 200W, 8Ω ≤0.005%

Noise

SE input

shorted,

Balanced open

Weighted, filter:

22Hz-22kHz

Slew Rate Individual Mode

Bandwidth 0-3dB <1Hz to >100kHz

Frequency

Response

Damping 20Hz, 8Ω >500

Weight Pounds:

Power

Consumption

(Watts)

Heat Load

(BTU/Hour)

Bridged Mono 8Ω Load:

SE: High: 29dB

SE: Low: 23dB

Bal: High: 29dB

Bal: Low: 23dB

Bridged Mode

Bridged: 500W 8Ω:

2 Ch. 200W 8Ω:

Bridged: 500W 8Ω:

8Ω Load:
4Ω Load:

Low: 23dB

High: 1.00V
High: 1.41V

Low: 2.00V
Low: 2.82V

Individual Mode

Single Ended

Balanced +

Balanced -

Bridged Mode

Single Ended

Balanced +

Balanced -

0±0.1dB 20Hz - 20kHz

Kilograms:

Standby:

Idle:

200W 8Ω:

Idle:

200
300
500

28.28 V/V

14.14 V/V

100W
200W
100W
200W

≈30kΩ
≈30kΩ
≈6kΩ

≈7.5kΩ
≈5kΩ
≈5kΩ

<-104dB
<-110dB
<-105dB
<-111dB

>120V / µS

34.4

15.6

<0.5
≤60
700
1300

205
2388
4435

>60V / µS

Power Output

Per Channel

(Watts)

Gain High: 29dB

Sensitivity

(into 8Ω)

Input

Impedance

IMD ≤0.005%, Typ. ≤0.002%

THD+N 20Hz-20kHz @ 300W, 8Ω ≤0.005%

Noise

SE input
shorted,

Balanced open

Weighted, filter:

22Hz-22kHz

Slew Rate Individual Mode

Bandwidth 0-3dB <1Hz to >100kHz

Frequency

Response

Damping 20Hz, 8Ω >500

Weight Pounds:

Power

Consumption

(Watts)

Heat Load

(BTU/Hour)

Bridged Mono 8Ω Load:

SE: High: 29dB

SE: Low: 23dB

Bal: High: 29dB

Bal: Low: 23dB

Bridged Mode

Bridged: 900W 8Ω:

2 Ch. 300W 8Ω:

Bridged: 900W 8Ω:

8Ω Load:
4Ω Load:

Low: 23dB

High: 1.00V
High: 1.73V

Low: 2.00V
Low: 3.46V

Individual Mode

Single Ended

Balanced +

Balanced -

Bridged Mode

Single Ended

Balanced +

Balanced -

0±0.1dB 20Hz - 20kHz

Kilograms:

Standby:

Idle:

300W 8Ω:

Idle:

300
500
900

28.28 V/V

14.14 V/V

100W
300W
100W
300W

≈30kΩ
≈30kΩ
≈6kΩ

≈7.5kΩ
≈5kΩ
≈5kΩ

<-111dB
<-116dB
<-112dB
<-118dB

42.1

19.1

<0.5
≤80
1000
1700

273
3412
5801

>60V / µS
>120 / µS

10

Dimensions

4B3 & 3B3 Amplifiers

Minimum recommended
clearance for heat dissipation

11

Bryston Limited | 677 Neal Drive | Peterborough, Ontario K9J 6X7

Canada | Phone: [phone] | www.bryston.com

300043-5 2016-03-09