Distribution Amplifier


RKB-D850 shares the same power rating and features as the RKB-850 but includes digital inputs.

Power8 x 50 Watts of

Class DClass D amplifier

IC24-bit/192kHz Digital to
Analogue Converters

Rack MountRack ears included

Automatic signal sensingAutomatic signal sensing

Engineered with care.

RKB-D850 Internal View

Dimensions (W × H × D)
430 × 97 × 424mm
17" × 3.9" × 16.7"
Front Panel Height
2U / 88.1mm (3.5")
Power Requirements
230V, 50Hz
Power Consumption
Standby Power Consumption
Net Weight
9.3kg (20lbs.)
BTU Rating (4Ω, 1/8th power)
180 BTU/h


Continuous Power Output
50W/Ch (All channels driven, 8Ω)
Total Harmonic Distortion (THD)
(20Hz–20kHz) <0.08%
Frequency Response
10Hz - 100kHz +0dB, -1.4dB
S/N Ratio (IHF "A" Weighted)
Line Level Inputs: 108dB
Digital Inputs: 95dB
Product Description 

The RKB-D850 is essentially the same amplifier as the RKB-850 in terms of power output and features. However, the RKB-D850 also features four optical digital TOSLINK inputs with individual stereo DACS for each pair of channels in addition to the four analogue RCA inputs. Each digital input supports up to 24-bit/192kHz LPCM audio.

The RKB-850 and RKB-D850 share many common features including 12-volt triggers, 5-way speaker binding posts, input linking, signal sense, a buffered analogue audio pre-output to connect additional RKBs, and an IEC power receptacle with detachable cord.

More Specifications 
Intermodulation Distortion (60Hz:7kHz, 4:1)
Damping Factor
Speaker Impedance
4Ω minimum
Crosstalk / Separation
Input Sensitivity
Line Level Inputs: 0.6V
Digital Inputs: -10dBfs
Input Impedance
Optical Digital Signals
SPDIF LPCM (up to 192kHz/24-bit)

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