Rotel RKB-8100 - 8 Channels x 100W Theater or Multi-Room Amplifier

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Besides theater and multi-room I could see someone using this great and capable amplifier for bi-amping 3 or 4-way speakers that allow it, or perhaps an active speaker system.

This amp is in very clean condition with little signs of use. It was tasted fully in our lab were it performed admirably

More from Rotel:
Rotel’s RKB amplifiers are the result of a great deal of research into what custom installers require for today’s multizone audio configurations. They incorporate an extended feature set with rugged reliability and superb audio performance. 

It’s no secret the typical long runs of speaker cable in custom installations present real challenges to amplifiers. The best way to maximize the sound quality of custom speakers is to provide them with plenty of high quality power.

Identical in terms of features to its 50 Watt per channel cousins, but with a full 8 x 100 Watts per channel, all channels driven at 8 ohms, the RKB-8100 and RKB-D8100 are Rotel’s most sophisticated and powerful custom installation amplifiers.

At only 2U height, with a dual-fan cooled chassis, four front panel trim pots, selectable power control options, a rear panel RS2323 connection and improved input linking, they are the perfect solution for higher performance multizone audio systems.

Specifications:
DIMENSIONS (W × H × D)
430 × 97 × 424mm
17" × 3.9" × 16.7"
 
FRONT PANEL HEIGHT
2U / 88.1mm (3.5")
 
POWER REQUIREMENTS
120V, 60Hz
 
POWER CONSUMPTION
300W
 
STANDBY POWER CONSUMPTION
<0.5W
 
NET WEIGHT
9.6kg (21lbs.)
 
BTU RATING (4Ω, 1/8th power)
279 BTU/h

CONTINUOUS POWER OUTPUT
100W/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)
108dB
 
GAIN
30dB

Recommended Cables:

Kimber Kable - RCA Interconnects - Better

Kimber Kable - RCA Interconnects - Best

Kimber Kable - Speaker Cables - Better

Kimber Kable - Power Cords - Better

The SkyFi Testing Process for Solid State Amplifiers:

We start with a visual inspection of all internal components to make sure that there are no signs of heat stress or damage. Capacitors are checked for telltale signs of predictive failure including bulging, shrunken wrappers, or physical leakage. We also inspect the PCBs for discoloration from resistors or transistors that may have been running hot. On vintage units we often spot check select capacitors for value and ESR.

If the amplifier passes visual inspection, we move on to a controlled power on sequence using a Sencore safety analyzer to monitor current draw in real time. Once the amplifier is determined to be safe to operate, we connect it to full AC mains for function and power testing. We connect the speaker outputs of the amplifier to a Sencore PA81 Power Analyzer which acts as a dummy load, DC offset monitor, and oscilloscope interface. We start with a low level 1KHz test signal at the amplifier’s input and slowly increase its amplitude while monitoring the output on an oscilloscope for signs of noise, clipping, distortion, or improper channel balance. We continue increasing the signal level until the amplifier reaches clipping. At this point we take an output power measurement and compare it to the spec sheet of the amplifier to verify proper performance. If the device under test has both balanced and single ended inputs they are both tested at this time. We finish off the bench evaluation with a 1KHz square wave check and a 20Hz to 20KHz sine sweep to assess the amplifier’s frequency response characteristics. This battery of tests will usually reveal if the amplifier has any issues that need further attention.

Before the device leaves the bench, we perform a listening test with actual music using a variety of preferred test tracks. Our benches are outfitted with familiar monitor speakers which help us identify inconsistencies that will not always show up on our test gear. The main things that we are listening for are hum or noise with no signal present, proper center image, clicks, pops, or any other obvious undesirable audio characteristics.

If the unit passes all of these tests it is moved to our long term testing rig where we simulate real word operating conditions for 6-8 hours. This allows us to monitor the unit for signs of thermal runaway or intermittent issues that only crop up when the unit has fully come up to temperature.