Rotel RB-1552 MKII 2-Channel Power Amplifier
The Rotel RB-1552 MKII is a stereo power amplifier in class AB offering 130 W per channel at 8 ohms, with power reaching up to 185 W at 4 ohms. In line with Rotel’s philosophy for over 50 years, the RB-1552 MKII combines refined sound quality with an accessible price.
Sleek Design and Robust Construction
The RB-1552 MKII features an elegant brushed aluminum silver front panel. Its solid chassis and generous dimensions (W 43.1 x D 33.9 x H 14.4 cm, weighing 12.4 kg) reflect serious construction, ensuring lasting performance. Gold-plated balanced XLR and unbalanced RCA input connectors ensure optimal signal transmission. Four speaker terminals allow for connecting two pairs of speakers simultaneously.
Oversized Power Supply for Stunning Dynamics
At the heart of the RB-1552 MKII is an oversized power supply, built around a low-radiation, high-efficiency toroidal transformer. British-made “slit-foil” capacitors store abundant energy reserves to effortlessly handle the most demanding passages. This generous power supply gives the amplifier exceptional dynamics and the ability to easily drive challenging speakers.
Sophisticated Electronics for Ultra-Precise Sound Reproduction
The power stages of the RB-1552 MKII use multiple high-current bipolar transistors. Each channel, completely separate from the other, benefits from its own rectification and filtering circuit. This dual mono configuration ensures perfect channel separation and a very wide soundstage. All critical components are hand-sorted and matched for optimal precision. The result is sound with remarkable transparency and musicality, with a stunning level of detail.
Impressive Technical Specifications
With a frequency response ranging from 10 Hz to 100 kHz (+/- 0.5 dB), the RB-1552 MKII reproduces the entire audio spectrum without any alteration. Its harmonic distortion rate of less than 0.03% from 20 Hz to 20 kHz at 8 Ω reflects exemplary linearity. The signal-to-noise ratio of 120 dB (A-weighted) ensures absolute operational silence, highlighting micro-details. Finally, the high damping factor (450) ensures perfect control of speaker diaphragms for deep and tight bass.
Effective Protection for Unmatched Peace of Mind
To guard against any risk of damage under abnormal conditions, the RB-1552 MKII incorporates highly sophisticated thermal and overload protection circuits. Unlike many competing devices, these safety features do not affect sound performance. They continuously monitor the temperature of power components and the current passing through them, cutting off power if limits are exceeded. A front panel indicator signals the possible activation of this protection.
A Versatile Amplifier That Adapts to Your Setup
Thanks to its 12V trigger input and output, the RB-1552 MKII can be powered on/off by another device or control others. This feature facilitates its integration into a complete audio-video system. Additionally, the included rack-mounting accessories allow for easy installation of this amplifier in a standard cabinet. With the RB-1552 MKII, Rotel delivers an amplifier equally suited for 2-channel hi-fi setups and the most ambitious home theater systems.
What are the main advantages of the RB-1552 MKII compared to a regular amplifier?
The RB-1552 MKII stands out with its ultra-robust construction, generous power supply, carefully selected components, and dual mono design. These elements provide it with stunning dynamics, high precision, a very wide soundstage, and exceptional detail. Its ability to easily drive difficult loads is also a major asset.
Can I connect two pairs of speakers to this amplifier?
Yes, the RB-1552 MKII has two pairs of speaker terminals per channel. You can connect a total of four speakers. Note that there is no selector for choosing the speakers, so both pairs will operate simultaneously.
Is there a risk of this amplifier damaging my speakers in case of a problem?
This is very unlikely. The RB-1552 MKII incorporates sophisticated thermal and overload protection circuits. In case of an anomaly (short circuit, overheating…), the amplifier will go into protection mode by cutting off the sound. An indicator on the front panel will alert you to this situation.
What cables should I use to get the best out of the RB-1552 MKII?
Given the very high performance level of this amplifier, it is recommended to use high-quality interconnect and speaker cables. Opt for balanced connections (XLR) with quality shielded cables. For the speakers, choose OFC copper cables with a large cross-section (minimum 2.5 mm²).
What is the difference between the RB-1552 MKII and the RB-1582 MKII?
The RB-1582 MKII is the big brother of the RB-1552 MKII. It uses the same platform but delivers a higher output power of 200 W per channel at 8 ohms, compared to 130 W for the RB-1552 MKII. It is therefore better suited for the most challenging speakers to drive.
