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Precise Control and Plenty of Power for Movies and Multi-channel Music
Although offering slightly less muscle than its big brother, the RM-1585, the Rotel RMB-1555 is a remarkable multichannel amplifier with power output conservatively rated at 120 Watts per channel into 8 ohms – all channels driven! With all but the most demanding speakers located in extraordinarily large rooms, the RMB-1555 exerts the kind of precise control that presents both nuance and bombast correctly from the faintest flute overtones to the subterranean rumble of an approaching apocalypse.
The RMB-1555 employs a high current, toroidal transformer matched to discrete output transistors with their higher thermal stability and freedom from the designed-in compromises that characterize their integrated circuit cousins. The Class AB amplifier configuration assures the best balance between power output and thermal efficiency.
"The Rotel Was the Winner"
"No issues powering all my gear to reference levels in my smaller room. The amp sounds great, very solid and never gets hot, even when pushed hard," notes Eric Granato, avforums.com. "I looked at a few different brands… (there was a shop not too far away that was importing from the U.S.) and all sounded good, but for the money, build quality, and sound quality, the Rotel was the winner."
"The RMB-1555 is a five channel, 120 watts per channel offering that should please all but the most demanding of users," reports Tom Andry in his review for audioholics.com. "For them, there is the 200 watt RMB-1585. The biggest change from the last generation of home theater amps from Rotel? The switch back from Class D to Class A/B. In our opinion this was a good move as linear amps tend still provide the most reliable amplification for the widest range of loudspeakers."
"The amp is very neutral meaning it does add or remove anything from the sound. For home cinema it is great," observes Wayden, avforums.com. " or music… what I found is if the source is not up to scratch, you will hear it."
Powerful, High-Current Output
An oversized factory-built toroidal transformer and high efficiency capacitors drive an array of high current output transistors ensuring fast transient timing, accurate detail and controlled consistency of low frequency. Maintaining crucial timing and energy while delivering effortless power is a signature trait of this amplifier. The power supply uses special “slit foil” capacitors to provide completely stable power to the output stage. Slit foil capacitors have the ability to charge and discharge extremely quickly, thereby ensuring signal fidelity during orchestral crescendos or repetitive kick-drum impacts, for example.
Critical evaluation of the circuit design and meticulous selection of each acoustic audio components ensures accuracy, power and efficiency all coupled with an unsurpassed build quality ensuring this amplifier proudly wears the Rotel name.
Protection Circuitry
The RMB-1555 features thermal and over-current protection circuits that protect against potential damage in the event of extreme or faulty operating conditions. Unlike many designs, these protection circuits are independent of the audio signal and have no impact on sonic performance. Instead, the protection circuits monitor the temperature of the output devices and the current they are handling and shut down the amplifier if operating conditions exceed safe limits.
Most likely, you will never see this protection circuitry in action. However, should a faulty condition arise, the amplifier will stop playing and the LED indicator on the front panel will light up.
Built-in Cooling Fan
The Rotel RMB-1555 amplifier is equipped with dual cooling fans to help ventilate the internal components. The rear panel includes a three-position fan speed selection switch including Fan Off, Fan Low Speed and Fan High Speed. Please select the fan speed that best suits the installation and cooling requirements, considering that higher speed fan will provide more cooling.
Trigger ON/OFF Mode Selector
The RMB-1555 provides the option for manual or automatic power on/off operation. These modes are selectable using a toggle switch on the back panel.
With the switch in the +12V TRIGGER ON position, the amplifier is turned on automatically when a 12V trigger signal is present at the 3.5 mm Jack of TRIGGER IN on the rear panel. The amplifier will go into standby mode if the +12V signal is not present. The front panel POWER SWITCH overrides this function. It must be ON for the +12V trigger to work. Turning the switch OFF cuts power to the amplifier, regardless of whether or not a trigger signal is present.
