Rotel RMB-1504 4-Channel Amplifier

Rotel RMB-1504 Four Channel Power Amplifier

The Rotel RMB-1504 is a high-performance Class AB 4-channel power amplifier built for clean, controlled power in home theater and custom installation / multi-room audio systems. With 70 watts per channel into 8Ω (all channels driven) and the muscle to handle 4Ω speaker loads, it’s an ideal solution for driving in-ceiling/height speakers for immersive surround formats, distributed audio zones, or any setup that demands stable, low-noise amplification.

Installation is where the RMB-1504 really shines: rack mounting support, front-panel level controls, input linking and mono options, plus 12V trigger in/out and automatic signal-sensing power make it easy to integrate with AV receivers, processors, and whole-home control systems. Internally, Rotel’s oversized toroidal transformer, high-efficiency capacitors, and high-current output devices are engineered for fast transients, strong bass control, and consistent performance—even with long cable runs and challenging speaker loads.

The Rotel RMB-1504 is part of ListenUp's Rotel Power Amplifiers Collection.

What It's Good At:

• Delivering clean, dynamic 4-channel Class AB power for home theater and multi-zone audio
• Driving overhead/height speakers with clarity for immersive surround installations
• Offering installer-friendly control with front-panel input level attenuators
• Supporting flexible system layouts with input linking, mono switching, and output link connections
• Simplifying integration using 12V trigger in/out and auto signal-sensing power-on
• Maintaining tight, controlled sound with a high damping factor and robust power supply design

Rotel RMB-1504 Full Specifications:

• Amplifier Type: Class AB, 4-channel power amplifier
• Channels: 4
• Continuous Power Output (8Ω): 4 × 70 W/ch (20Hz–20kHz, <0.03% THD, all channels driven)
• Continuous Power Output (4Ω): 4 × 115 W/ch (DIN 1kHz, 1.0% THD, all channels driven)
• Total Harmonic Distortion (THD):
  • (20Hz–20kHz, 8Ω) <0.03%
  • Continuous rated power: <0.03%
  • One-half rated power: <0.03%
  • 1 watt power: <0.03%
• Intermodulation Distortion: (60Hz:7kHz, 4:1) <0.03%
• Frequency Response: 10Hz – 100kHz (±1dB)
• Signal-to-Noise Ratio: 115 dB (IHF “A” weighted / IHF A)
• Gain: 26 dB
• Damping Factor: >200 (20Hz–20kHz, 8Ω)
• Crosstalk / Separation: >50 dB
• Speaker Impedance: 4Ω minimum
• Input Sensitivity: 1.0 V
• Input Impedance: 20 kΩ
• Input Overload Level: 5.0 V
• Auto Turn-On Level (Signal Sense, all inputs): 4 mV input signal
• Power Control Options: Manual, Automatic signal sensing, 12V trigger control
• 12V Trigger: Input and output connections
• Front Panel Controls: Input level controls / volume attenuators (per channel)
• Connectivity / Installation Features: Input linking, input mono switch, signal output link connectors
• Speaker Terminals: 5-way binding posts (supports dual banana type connectors; restricted in some EU countries)
• Rack Mounting: Rack ears included (some markets); rack mount capability supported
• Protection: Protection circuitry against fault conditions with front-panel indicators
• Power Requirements:
  • U.S. version: 120V, 60Hz
  • European version: 230V, 50Hz
• Power Consumption:
  • 300 W (idle)
  • 300 W (4Ω, 1/8 power)
  • Site listing also notes 450 W power consumption
• Standby Power Consumption:
  • Standby: <0.5 W
  • Signal Sense: 1 W
• BTU Rating: 810 BTU/h
• Dimensions (W × H × D): 431 × 144 × 443 mm (17" × 5.7" × 17.5")
• Front Panel Height: 3U / 132.6 mm (5.25")
• Net Weight: 14.9 kg (32.8 lbs.)

Rotel RMB-1504 Q&A:

What is the RMB-1504 best used for?

It’s designed for home theater and custom installation, including powering height/overhead speakers, multi-room zones, or any setup needing clean 4-channel amplification.

How much power does it deliver per channel?

It delivers 70W per channel into 8Ω (all channels driven) and 115W per channel into 4Ω (DIN 1kHz, 1.0% THD).

Can it handle 4-ohm speakers?

Yes. The RMB-1504 is rated for 4Ω minimum speaker impedance, making it suitable for many real-world architectural and in-room speaker loads.

Does it support rack mounting?

Yes. It’s built with custom installation in mind and supports rack mounting (rack ears are included in some markets).

How does it turn on and off in an installed system?

You can power it manually, use automatic signal sensing, or control it through a 12V trigger for seamless integration with processors and control systems.

Can I match levels between channels or zones?

Yes. The front panel includes input level controls / attenuators to fine-tune channel gain and match speaker sensitivity across a system.

Can it simplify wiring for multi-channel setups?

Yes. It includes input linking, an input mono switch, and signal output link connectors to streamline routing and expand configuration options.

Is it designed to protect itself and connected speakers?

Yes. It includes protection circuitry for fault conditions, along with front-panel indicators for clear status monitoring.

Rotel RMB-1504 Downloads:

Rotel RMB-1504 Manual
Rotel RMB-1504 Specifications Sheet
Rotel RMB-1504 Drawing