Rotel RKB-850 Eight Channel Amplifier

Rotel RKB-850 Eight Channel Amplifier

Free UK Delivery


Home delivery

Collect in Store



Audio experts Rotel have been designing, engineering and manufacturing some of the most prestigious power amplifiers for over half of a decade, claiming many awards as well as the ears and hearts of music lovers all over the world. This impressive level of experience and expertise has most recently been applied to their new range of rack-mountable custom installation amplifiers. These new amplifiers boast a bar-raising level of reliability, performance capability, and ease of installation. 

This new range consists of four Class D amplifiers, all of which come in two 8-channel configurations, possessing 50 watts channel and 100 watts per channel with all channels being driven at the same time. The RKB-850 contains analogue-only input functionality, while it's big brother, the RKB-D850 features both digital and analogue inputs.

The RKB850 and RKB-D850 have been rated at 8 x 50 watts RMS in to 8ohms all channels driven, and double that output into 4 ohms as a result of the intricacy and sophistication of their efficient Class D design. These amplifiers are highly durable and extremely reliable. Rotel have gone the extra mile in building a product that truly maximises its long-service life, featuring dual thermostatically controlled fans to alleviate heat from the output models and the power supply.

Both of the 50-watt channel models of the new RKB range feature input linking, through input A on the rear panel unit to allow the analogue (and digital in the case of the RKB-D850) signal on input A to be routed to all three other channels. This saves time and the need for additional wiring. Analogue Input A can also be used to reproduce a mono signal, allowing to channels of summed stereo-to-mono output.



Model  RKB-850 
 Continuous Power Output
(20Hz-20kHz, <0.1% THD, 8 ohms)
50 watts per channel,
8 channels driven 
 Total Harmonic Distortion
(20Hz-20kHz, 8 ohms)
 Intermodulation Distortion
(60 Hz : 7 kHz, 4:1)
 Damping Factor >150 
Input Impedance/Sensitivity 100,000 ohms / 0.9v
 Amplifier Gain 30dB 
 Frequency Response 20Hz - 20kHz, +0dB/-1.4dB 
 Signal to Noise Ratio (IHF A) 108dB 
 Crosstalk/Separation  >60dB
 Speaker Impedance Minimum of 4 ohms 
Power Requirements USA: 120 Volts, 60 Hz
EC:  230 Volts, 50 Hz
Power Consumption 150 watts
Idle: 40 watts
Standby: < 0.5 watts
  Dimensions (W x H x D) 430 x 97 x 424 mm 
 Front Pannel Height  2U (88.1mm)
Net Weight 9.3Kg, 20.5lbs
Included Accessories Rack Mount Kit


Power Requirements:


Providing your item is in stock, the order is usually dispatched within 24 hours. Please remember that postage and packing is completely free for orders over £50*. Out of stock items will be dispatched as soon as they become available, out of stock items can take between 4 to 21 days for dispatch.

Deliveries usually take 1-3 working days. The majority of orders are sent via our couriers'; Interlink Express on a next-day-delivery service. Smaller, low value or light-weight items are normally posted using Royal Mail Recorded or Royal Mail Special Delivery.

Once your product has been dispatched, you will be notified via email and sent a unique consignment number, you can use this number at to check the status of your delivery. If you have provided a mobile telephone number, Interlink's Predict service will notify you by text (and email) of a one-hour delivery window. If the window they suggest is inconvenient, you can change the date of delivery to a later one via text or email.

*We ship free of charge to mainland UK addresses, excluding the Scottish Highlands or 'Out-Of-Reach' Scottish locations. Please consult the post-codes below to see if your location falls within this category. If you are still unsure, please contact us on 01432 354921. We also ship to Northern Ireland, Channel Islands, Scilly Isles, Scottish Isles and Scottish Highlands, however delivery to these locations will incur a charge and can only be sent via a 2-day service.

Shipping CostsMainland UK (Next-Day)Offshore/Out-of-reach (2-day)Northern Ireland, Channel Islands, Isle of Man, Scottish Islands, Scilly IslandsRepublic of Ireland (2-day)
Under £50 Orders £7.50 £12.50 £15.00
Over £50 Orders FREE £19.99 £29.99
Surcharge Orders £50.00 £69.99 £79.99
Saturday Delivery £12.99 N/A N/A
Sunday Delivery £12.99 N/A N/A
Saturday by 12 Delivery £35 N/A N/A


Post codes exempt from the free delivery service include:

Scottish Highlands Post Codes: AB30-38, AB41-42, AB44-56, FK17-99, G83, IV1-28, IV30-39, IV52-54, IV63, KW1-14, PA21-33, PA34-40, PH15-26, PH31-41, PH49-50
Islands Post Codes: HS1-9, IV40-51, IV55-56, KA27-28, KW15-17, PA20, PA41-49, PA60-78, PH42-44, ZE1-3
Northern Ireland: All BT postcodes
Channel Islands Post Codes: JE, GY
Scilly Isles Post Codes: TR21, TR22, TR23, TR24, TR25

Press & Awards