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General
Welcome
Thank you for your purchase of a Bryston 28B
(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 28B
is a mono design audio power amplifier
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with one channel capable of 1000 watts 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.
28B³ Amplifiers 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. All models feature rear handles. Nineteen
inch wide amplifiers include front mounted handles.
Features
Bryston 28B
includes the following features:
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•
Balanced XLR input. Pin 2 positive.
•
Single ended (RCA) input.
•
SoftStart circuitry for managing inrush current
upon initial power up.
•
Wired remote control AC/DC trigger input and
passthrough with supplied connector.
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
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shipping carton with plastic foam inserts is available
from Bryston for a small fee.
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Installation and Usage
Ventilation
Bryston has deliberately chosen to omit fans from
our amplifiers in an effort 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 effectively, 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 sink temperature may exceed 85°C!
Never operate the amplifier in a vertical
position.
Connecting to A/C Power
Please check the Data Plate on the rear of the
amplifier to verify power requirements agree with
your location. See "9. Data Plate:" on page 9.
Before plugging in the power cord, make sure the
Master Circuit Breaker ("5. Master Circuit Breaker:"
on page 8) 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 "8. Power Status
Indicator:" on page 9. The amplifier is now ready
to be powered on.
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