Rotel RMB-1555

The RMB-1555 is a multichannel power amplifier from Rotel, intended to power a complete home cinema system in conjunction with a separate preamplifier stage or AV processor. It delivers 5x120 Watts per channel, enough to cover medium to large installations without faltering during the most dynamic passages.

Its design is built around a high-current toroidal transformer, paired with discrete output transistors selected for their thermal stability. This choice, rather than relying on integrated circuits, avoids certain design compromises and maintains precise control of the signal, even at high power. The output stage runs in class AB, a well-established compromise between power output and heat management.

In terms of measurements, the RMB-1555 shows total harmonic distortion below 0.03% between 20 Hz and 20 kHz into 8 ohms, a signal-to-noise ratio of 116 dB and an extended frequency response of 10 Hz to 100 kHz. The damping factor of 180 reflects good control over speaker cone movement, particularly in the bass. The amplifier accepts loads of 4 ohms and above, with an input sensitivity of 1.5 V for an impedance of 12 kohms and a gain of 26.5 dB.

This type of amplifier is aimed at home cinema installations built around multiple channels, in rooms where the speakers demand current and serious bass control. It suits a user who already has a separate preamplifier or AV processor, and who wants a consistent power reserve across five channels rather than a general-purpose integrated amplifier.