High-performance sound had always meant separate components, a lot of cables and large space requirements. Simple, integrated solutions fell short of the mark when it came to sound quality. In short, convenience came with compromise.
Until Boulder’s 865.
Please contact your authorized Boulder dealer for availability
Massive, shielded, toroidal transformer and multiple filter capacitors for immediate power transfer
Efficient heatsink design means high power in a small chassis without excessive heat
Four pairs of inputs, each capable of custom configuration and naming
One pair of auxiliary outputs that can be set for fixed (to drive secondary systems) or variable operation (to drive a subwoofer or additional amplifier)
Fully balanced input circuitry for maximum resolution and sound quality
Rugged, easy-to-connect, high-current speaker terminals require no tools
Boulder's own precision stepped volume control, the same as in the 2010 preamplifier
Input and preamplifier sections are housed in steel casework to eliminate interference from other portions of the amplifier
Supervising microprocessor controls all preamplifier functions, monitors protection circuits, and communicates with other Boulders
Continuous Output Power, 8 / 4 ohms
150W
Peak Output Power
300W into 4 ohms
Balanced Line Inputs
4 pairs
Auxiliary Balanced Outputs
1 pair (switchable: fixed or variable)
Loudspeaker Output Connectors
1 pair/channel, 6 mm/.250-inch wingscrews
THD at Continuous Power
20 Hz to 2 kHz: 0.0035%, 20 kHz: .018%
Signal-to-Noise Ratio (re: 150W/8 ohms)
-108 dB, unweighted, 20 Hz to 22 kHz
Frequency Response, 20 to 20 kHz
+0.00, -0.07 dB
Frequency Response, - 3 dB
0.015 Hz, 95 kHz
Maximum Input Level
6.0 Vrms
Input Impedance
100 kΩ balanced, 50 kΩ unbalanced
Common Mode Rejection (Balanced Only)
60 Hz: 90 dB, 10 kHz: 70 dB
Crosstalk, L to R or R to L
-112 dB or better, 20 Hz to 20 kHz
Crosstalk, Adjacent Inputs
-112 dB or better, 20 Hz to 20 kHz
Volume
100 dB range in 0.5 dB steps
Maximum Voltage Gain
46 dB
Gain at Auxiliary Outputs
Balanced: +4 dB, unbalanced: +2 dB
Control Systems Supported
Boulder Link, 12V Trigger In & Out
Weight
Amplifier: 47 lbs. (21.3 kg)
Shipping: 54 lbs. (24.5 kg)
Power Requirements
100, 120 220-240 VAC, 50-60 Hz
3W Standby, 850W maximum