Six Class AB channels for home cinema and multi-zone installations
Rotel RMB-1506 is a Class AB multichannel power amplifier rated at 50 W per channel into 8 ohms and 80 W per channel into 4 ohms with all channels driven, designed for home cinema systems and distributed audio.
The power supply is sized to support several loudspeakers at the same time, a more demanding condition than testing one channel alone. A large in-house toroidal transformer, high-efficiency capacitors and high-current output transistors provide the required reserve, while discrete circuits and trigger functions simplify installation in racks and dedicated cinema rooms.
Key features
- Six channels of Class AB amplification.
- 50 W per channel into 8 ohms with all channels driven.
- 80 W per channel into 4 ohms with all channels driven.
- THD below 0.03%.
- Large in-house toroidal transformer.
- High-efficiency capacitors and high-current output transistors.
- RCA inputs with link inputs and buffered output.
- Damping factor above 200.
Power with all channels driven
RMB-1506 delivers 50 W per channel into 8 ohms and 80 W per channel into 4 ohms with all six channels active. The all-channels-driven figure is important in a multichannel system because it describes supply capability when several loudspeakers demand current simultaneously during a dynamic soundtrack.
High-current power supply
A large in-house toroidal transformer supports the power section. Its reserve is sized for simultaneous channel use and reduces the risk that peaks on one loudspeaker take energy from the others, maintaining more stable behaviour across the system.
Capacitors and transients
High-efficiency capacitors and high-current output transistors support transients and bass when effects involve several channels. Low internal resistance helps transfer energy rapidly to the output stages without introducing a slow response under load.
Class AB and response
Declared THD is below 0.03% and frequency response runs from 10 Hz to 100 kHz within ±1 dB. A damping factor above 200 contributes to woofer control, particularly useful when several large loudspeakers are driven in the same room.
Inputs and AV processor
RCA inputs with link inputs and a buffered output connect surround processors and preamplifiers with different outputs. The six channels can serve three stereo zones; front attenuators, 12 V trigger and buffered output simplify expansion to other amplifiers. The power amplifier remains independent of decoding and can be retained when the upstream processor changes.
Trigger and installation
The 12 V trigger allows the power amplifier to switch on with the processor or a control system. Installation functions reduce the need for manual intervention when the unit is placed in a technical rack or dedicated cinema room.
Chassis and thermal management
The chassis measures 431 x 144 x 424 mm and weighs 15.3 kg. Heatsinks, power supply and amplification modules occupy most of the structure and are distributed to encourage cooling while keeping input sections away from the main sources of heat and magnetic field.
