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255 South Taylor Avenue Louisville, Co 80027 U.S.A Tel: 303-495-2267 E-mail: sales@boulderamp.com Web: www.boulderamp.com
861 Stereo Power Amplifier
Boulder Amplifiers, Inc.
255 S. Taylor Avenue
Louisville, CO 80027
(303) 495-2267
www.boulderamp.com
BoulderAmplifiersInc
@boulderamplifiers
@BoulderAmps
i
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Table of Contents
Related Manuals for Boulder 861
Summary of Contents for Boulder 861
- Page 1 255 South Taylor Avenue Louisville, Co 80027 U.S.A Tel: 303-495-2267 E-mail: sales@boulderamp.com Web: www.boulderamp.com 861 Stereo Power Amplifier Boulder Amplifiers, Inc. 255 S. Taylor Avenue Louisville, CO 80027 (303) 495-2267 www.boulderamp.com BoulderAmplifiersInc @boulderamplifiers @BoulderAmps...
- Page 2 About About Boulder Amplifiers, 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 finished products are never compromised.
- Page 3 Please take a few minutes to read through this instruction manual prior to using your 861. This 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.
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Page 4: Table Of Contents
Introduction � � � � � � � � � � � � � � � � � � � � � � 3�6 Placement of the 861 Stereo Power Amplifier 3-6 Connections � � � � � � � � � � � � � � � � � � � � � � 3�7... - Page 5 Appendix � � � � � � � � � � � � � � � � � � � � � � 5�15 Technical Specifications 5-15 Weights and Dimensions 5-16 861 Stereo Power Amplifier Dimensions 5-17 Troubleshooting 5-18 No Power Indication 5-18 Power Indication but No Sound...
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Page 6: Introduction
(RF). While placement is not critical, known magnetic fields should be avoided. The 861 Stereo Power Amplifier will generate some heat. Therefore, it should be located in an area with ample air circulation. Specifically, be certain that the heat sinks are unobstructed by objects that could potentially block airflow. -
Page 7: Connections
Connections Connecting to a Network In order for the 861 to download software 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. -
Page 8: Connecting To An Unbalanced Analog Source
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. -
Page 9: Connecting To The Ac Mains Outlet
“On” position, the LED on the front panel will illuminate red for a short time. During this time the 861 is booting up. The LED will then pulse white on and off, indicating that the supervising microprocessor is powered up and the amp is ready to be turned... -
Page 10: Connecting Your Loudspeakers
Connections 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: This is a high-powered amplifier! There is high voltage potential at the terminals when driven. -
Page 11: Operation
NOTE: Because the 861 greatly reduces power consumption when in Standby mode, it is only necessary to place the amplifier in Standby when not in use. You do not need to turn the 861 off via the Master AC Switch on the rear panel. The 861 was designed for years of operation in this manner and no damage to the unit will occur. -
Page 12: Input Dc Offset Voltage Detection
Operation Input DC Offset Voltage Detection The Boulder 861 is a direct-coupled power amplifier with a servo for zeroing out DC voltage offset coming from the preamplifier or other sources connected to the amplifier’s input. If the DC at the inputs is sufficient to cause potentially damaging voltage at the output terminals, a protection circuit will mute the amplifier’s output by electronically disconnecting the... -
Page 13: Maintenance
Errors Requiring Boulder Dealer Service If the 861 Stereo Power Amplifier will not turn on and the front panel LED blinks red, an error requiring dealer service has occurred. The indicator may flash red in a specific sequence to define its error code for an authorized Boulder technician. -
Page 14: Programming
Once the page is accessed, the various programming functions can be viewed, changed, and saved. To access the 861’s HTML page, you will need a computer that is connected to the same network as the 861 to enter the 861’s network address into a web browser. -
Page 15: Appendix
Appendix Technical Specifications Continuous Power, 8 Ohms Peak Power, 8 Ohms Continuous Power, 4 Ohms Peak Power, 4 Ohms 110W Peak Power, 2 Ohms 200W Balanced Analog Inputs 1 Pair of Balanced 3 pin XLR Outputs .25" (6 mm) Binding Posts Distortion, THD 0.01% Equivalent Input Noise (EIN), 20 kHz... -
Page 16: Weights And Dimensions
Appendix Weights and Dimensions 861 Stereo Power Amplifier Chassis: 12” W x 12” D x 3.25” H (21.5 lbs) 30.5 cm W x 30.5 cm D x 8.3 cm H (9.75 kg) Shipping: 24” W x 23” D x 14” H... -
Page 17: 861 Stereo Power Amplifier Dimensions
Appendix 861 Stereo Power Amplifier Dimensions 13.541 12.000 12.000 .910 2.000 8.000 3.504 .379 1.625 8.900 1.475 5-16... -
Page 18: Troubleshooting
Remedy Master AC Power Switch on Turn on Master AC Power rear panel is not ON Switch 861 is not plugged in Connect power cord to AC mains outlet 861 boot-up is locked Turn off unit from Master AC No Power Indication... -
Page 19: Notes
Appendix Notes: 5-18...
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