Boulder 861 Manual de usuario
i
255 South Taylor Avenue Louisville, Co 80027 U.S.A Tel: 303-495-2267 E-mail: sales@boulderamp.com Web: www.boulderamp.com
Boulder Ampliers, Inc.
255 S. Taylor Avenue
Louisville, CO 80027
(303) 495-2267
www.boulderamp.com
BoulderAmpliersInc
@boulderampliers
@BoulderAmps
861 Stereo Power Amplier
1-1
About Boulder Ampliers, Inc.
Boulder was founded in 1984 and is the last high-performance audio manufacturer operating
in North America to still perform all of its own design, engineering and manufacturing in-
house. While this form of production may be more costly than outsourcing, the resulting quality
control and reliability of the nished products are never compromised.
In 2016, Boulder moved into a new, purpose-built production facility to increase manufacturing
eciency and oer space for expansion to meet the needs of future growth.
2-2
Congratulations and thank you for selecting the Boulder 861 Stereo Power Amplier for your
high-performance sound system. We are certain it will provide you with many years of listening
pleasure.
e 861 represents the concerted eorts of numerous Boulder designers, engineers, and
technicians working to bring you the best audio playback components in the world. Please take a
few minutes to read through this instruction manual prior to using your 861. is will help you
understand the many functions and capabilities of the device. It will also allow you to maximize
the convenience and performance for which it was engineered.
Your Boulder 861 has undergone extensive laboratory tests for safety, functionality and technical
excellence. In addition, it has been individually subjected to rigorous listening trials in our
sound room utilizing a wide range of musical material. No product ever leaves our factory until
we are totally satised that it achieves its full potential.
2-3
Table of Contents
About - - - - - - - - - - - - - - - - - - - - - - - - 1-1
ank You - - - - - - - - - - - - - - - - - - - - - - 2-2
Introduction - - - - - - - - - - - - - - - - - - - - - - 3-6
Placement of the 861 Stereo Power Amplier 3-6
Connections - - - - - - - - - - - - - - - - - - - - - - 3-7
Connecting to a Network 3-7
Connecting to a Balanced Source 3-7
Connecting to an Unbalanced Analog Source 3-8
Connecting to the AC Mains Outlet 3-9
Connecting Your Loudspeakers 3-10
Operation- - - - - - - - - - - - - - - - - - - - - - 3-11
Powering Up 3-11
Input DC Oset Voltage Detection 4-12
Clip Detection 4-12
ermal Protection 4-12
Maintenance 4-13
Errors Requiring Boulder Dealer Service4-13
Operational Errors 4-13
2-4
Programming - - - - - - - - - - - - - - - - - - - - 4-14
HTML Programming 4-14
Appendix - - - - - - - - - - - - - - - - - - - - - - 5-15
Technical Specications 5-15
Weights and Dimensions 5-16
861 Stereo Power Amplier Dimensions 5-17
Troubleshooting 5-18
No Power Indication 5-18
Power Indication but No Sound 5-18
Notes: 5-19
3-5
Placement of the 861 Stereo Power Amplier
Your Boulder 861 Stereo Power Amplier is designed to reduce interference from external
magnetic and radio elds (RF). While placement is not critical, known magnetic elds should be
avoided.
e 861 Stereo Power Amplier will generate some heat. erefore, it should be located in an
area with ample air circulation. Specically, be certain that the heat sinks are unobstructed by
objects that could potentially block airow. Do not place the amplier on deep carpet and be
sure that the amplier has a minimum of 3 inches (8 cm) of free airspace on all sides.
You may want to have access to the rear panel for cable changes. Although input cables can be as
long as necessary, it is suggested that speaker cables be as short as possible.
3-6
Connecting to a Network
In order for the 861 to download soware updates as necessary, it will need to be connected to
a network with an active Internet connection. Connect a network cable between the 861 and a
network router or switch. Use the Ethernet connector on the rear panel of the 861.
Connecting to a Balanced Source
To fully realize the sonic potential of your 861 Stereo Power Amplier, always use balanced
connections. Balanced cables minimize interference from magnetic and RF sources.
Connect the cables from your source or preamplier outputs to the input connections provided
on the rear panel of the 861.
Input
3-7
Connecting to an Unbalanced Analog Source
Although the inputs and outputs are all of the 3-pin XLR type, an unbalanced source can easily
be accommodated by using an unbalanced to balanced cable. is cable has an RCA phono-type
connector on the source end and a 3-pin XLR connector for the input/output on the 861 end.
e negative input (pin 3) should be wired to ground only at the RCA phono connector. is
brings the inverted input reference of the 861 to the unbalanced source ground, thus reducing
ground loops.
Another option for connecting unbalanced sources is the Boulder ABL2 input adapter. It
converts a balanced input into an RCA phono input at the rear of the 861. Like the above cable,
the negative input of the 861 is connected to the ground of the RCA phono. However, this
negative side will then share the shield wire with the chassis ground and will not have the best
hum rejection.
3-8
Connecting to the AC Mains Outlet
Your 861 Stereo Power Amplier is supplied with a mains power cable suitable for the location
where it was purchased. It is constructed of large enough wire gauge and a plug appropriate for
your AC line voltage. Do not substitute another power cable.
Exact voltage and frequency compatibility is stated in the specications section. See page 5-1.
Once the 861 Stereo Power Amplier is connected to a live mains outlet and the rear panel
switch is moved to the “On” position, the LED on the front panel will illuminate red for a
short time. During this time the 861 is booting up. e LED will then pulse white on and o,
indicating that the supervising microprocessor is powered up and the amp is ready to be turned
on using the front panel Standby button.
3-9
Connecting Your Loudspeakers
Do not use a wrench or any other type of tool on the output terminal binding posts. Tighten
these connectors by hand only.
WARNING: is is a high-powered amplier! ere is high voltage potential at the
terminals when driven. Connections should only be made with the AC mains disconnected!
Select speaker cable spade terminals that will accept .250-inch (6 mm) diameter binding posts.
Note: ere is no provision for the use of banana plugs. Banana plugs are proven to lose spring
tension and come loose over time, increasing contact resistance and distortion. We also do not
recommend the use of banana plugs at the speaker end for these reasons.
Outputs
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