Rotel RB-1552MKII Stereo Amplifier

RB-1552 MkII

The Rotel RB-1552 MkII is a high-performance stereo power amplifier designed to deliver clean, authoritative power with the control and finesse audiophiles expect from a true Class AB design. Rated at 130 watts per channel into 8 ohms (and 185 watts per channel into 4 ohms), it drives demanding speakers with ease while preserving the detail, imaging, and dynamics that bring recordings to life.

Built with Rotel’s meticulous engineering approach, the RB-1552 MkII features independent left/right power rectification and decoupling in an essentially mono-block style layout to reduce crosstalk and improve channel separation. Premium British-engineered slit-foil capacitors provide deep energy reserves for explosive transients and fast recovery during complex musical passages. With both balanced XLR and unbalanced RCA inputs (selectable via rear switch), plus 12V trigger in/out for seamless system integration, it’s an ideal power-amp upgrade for serious two-channel and custom-installed audio systems.

The Rotel RB-1552MKII is part of ListenUp's Rotel Integrated Amplifiers Collection.

What It's Good At:

• Delivering robust, controlled power that stays clean during demanding dynamic peaks
• Producing high-resolution detail and separation with an essentially mono-block internal layout
• Driving 4-ohm capable speaker systems with confident grip and punch
• Preserving musical nuance with low distortion and wide bandwidth performance
• Integrating easily into premium systems via balanced XLR, 12V trigger, and rack-ready design
• Supporting clean, secure speaker connections with multi-format binding posts (bare wire, spades, dual bananas where permitted)

Rotel RB-1552 MkII Full Specifications:

• Product Type: Stereo Power Amplifier
• Amplifier Design: Class AB
• Continuous Power Output (20 Hz–20 kHz, <0.03% THD, 8 Ω): 130 watts/channel
• Power Output (4 Ω): 185 watts/channel
• Total Harmonic Distortion (THD) (20 Hz–20 kHz): < 0.03%
• Intermodulation Distortion (60 Hz : 7 kHz, 4:1): < 0.03%
• Frequency Response (±0.5 dB): 10 Hz – 100 kHz
• Signal-to-Noise Ratio (IHF “A” / A network): 120 dB
• Damping Factor (20–20,000 Hz, 8 Ω): 450
• Speaker Impedance: 4 Ω minimum
• Inputs: Balanced XLR and Unbalanced RCA (rear-panel input selector switch)
• Input Sensitivity:
  • RCA (Unbalanced): 1.5 V
  • XLR (Balanced): 2.5 V
• Input Impedance:
  • RCA (Unbalanced): 12 kΩ
  • XLR (Balanced): 100 kΩ
• Gain:
  • RCA (Unbalanced): 26.5 dB
  • XLR (Balanced): 22.5 dB
• 12V Trigger: Input and Output (3.5 mm); trigger input accepts control signals from 3 V to 30 V (AC or DC)
• Protection: Thermal and over-current protection circuitry
• Rack Mounting: Rack ears included
• Dimensions (W × H × D): 431 × 144 × 339 mm (17" × 5.7" × 13.4")
• Front Panel Height: 3U / 132.6 mm (5.25")
• Power Requirements:
  • U.S. version: 120 V, 60 Hz
  • European version: 230 V, 50 Hz
• Power Consumption: 400 W
• Standby Power Consumption: 0.5 W
• BTU Rating (4 Ω, 1/8th power): 905 BTU/h
• Net Weight: 12.4 kg (27 lbs)

Rotel RB-1552 MkII Q&A:

How much power does the Rotel RB-1552 MkII deliver per channel?

It delivers 130 watts per channel into 8 ohms and 185 watts per channel into 4 ohms, providing strong headroom for dynamic music and demanding speakers.

Is the RB-1552 MkII stable with 4-ohm speakers?

Yes. It’s rated for 4-ohm minimum speaker loads and is designed to maintain control and clarity when driving more current-hungry systems.

Does this amplifier support balanced XLR connections?

Yes. It includes balanced XLR inputs as well as unbalanced RCA inputs, selectable via a rear-panel input switch.

Can I connect both RCA and XLR inputs at the same time?

It’s best to use only one input method at a time (either RCA or XLR) and select the correct input type with the rear input selector switch.

Does the RB-1552 MkII have a 12V trigger for system automation?

Yes. It includes 12V trigger IN and OUT via 3.5 mm jacks, and the trigger input accepts 3–30V (AC or DC) control signals for flexible integration.

Can I rack mount the RB-1552 MkII?

Yes. It’s rack-friendly with a 3U front panel height and rack ears included for clean installation.

What protections are built in to keep the amplifier safe?

It uses thermal and over-current protection that monitors operating conditions and shuts down safely if limits are exceeded, then automatically resets once conditions normalize.

What are the physical size and weight of the RB-1552 MkII?

It measures 431 × 144 × 339 mm and weighs 12.4 kg (27 lbs), making it a substantial, power-focused component suitable for serious systems.

Rotel RB-1552 MkII Downloads:

Rotel RB-1552 MkII Manual
Rotel RB-1552 MkII Specifications Sheet
Rotel RB-1552 MkII Drawing