Background

Meridian have maintained a strong reputation for their power amplifier technology for over 15 years. Until now, their power amp developments have concentrated on high-transparency low-power models or on the custom amplifiers in their renowned active and digital speaker designs.

Meridian 557

The 557 takes the Meridian 500 Series into new territory – with 200W of clean clear power – for the first time allowing the option of a complete Meridian front end for large passive speakers. The Meridian 557 can be used with the 502 or 501 preamps, or with a Meridian DSP Surround Processor.

The Meridian 557 houses two powerful amplifiers in a dual mono construction. The amplifiers are both rated at 200W into 8 ohms. Each over-specified output stage uses 8 h igh-power transistors. These, combined with a massive low- noise 1.6kVA toroidal transformer, permit this amplifier to deliver currents in excess of 30A, ensuring no loss of performance even into loads that dip below 2 ohms. The massive power delivery of this amplifier makes it ideal for driving difficult loudspeaker loads.

557 can be operated in bridged mode giving power in excess of 680W into 8 ohms, 1000W into 4 ohms.

The 557 provides balanced and unbalanced inputs as well as twin outputs for bi-wiring.

The topology of 557 is very much in the Meridian tradition. A high-precision fast DC-precise input stage is combined with a fully complementary amplification and output stage. Also, the 557 uses Meridian’s well established self-adjusting bias and error-correction output topology.

The 557 is fully protected against DC and thermal overload. A proprietary Meridian soft-start circuit is also fitted.

557

Stereo Power Amplifier

Sales information

1st December 2001

∙Dual-mono 200-watt design

∙Balanced and unbalanced inputs

∙Massive low -noise 1.6kVA toroidal transformer

∙Current delivery of over 30A into difficult loads below 2 ohms

∙Fully protected against DC and thermal overload.

∙Soft start using proprietary Meridian circuit

Meridian Audio Limited

Stonehill, Stukeley Meadows

Huntingdon

Cambridgeshire PE29 6EX

T +44 (0) 1480 445678

F +44 (0) 1480 445686

Meridian America Inc.

Suite 122, Building 2400

3800 Camp Creek Parkway

Atlanta GA 30331

T (404) 344 7111

F (404) 346 7111

www.meridian-audio.com

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Meridian America 557 manual Background, Meridian, Stereo Power Amplifier
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557 specifications

Meridian America 557 is a high-performance digital-to-analog converter (DAC) designed to enhance the listening experience for audiophiles and music enthusiasts. This advanced DAC combines cutting-edge technology and engineering excellence, making it a standout product in the realm of audio playback.

One of the main features of the Meridian 557 is its precision in digital audio conversion, utilizing high-resolution processing capabilities that support 24-bit/192kHz audio formats. This ensures that every nuance and detail of the original recording is preserved, allowing listeners to enjoy music as it was intended by the artist. The robust digital architecture is paired with high-quality components to minimize signal degradation, making it an ideal choice for high-fidelity sound systems.

The 557 leverages Meridian’s proprietary technologies, such as the Meridian High Resolution Audio format and the Meridian Digital Signal Processing (DSP). These innovations enhance sound quality, providing a smoother, more immersive listening experience. The DSP capabilities ensure that digital audio signals are optimized, resulting in a clearer and more dynamic sound stage.

In terms of connectivity, the Meridian America 557 offers a wide range of inputs and outputs, making it highly versatile. It includes both digital inputs like USB, coaxial, and optical connections, allowing users to connect various devices such as computers, CD players, and streaming units. Additionally, balanced and unbalanced outputs ensure compatibility with a wide variety of audio systems, further enhancing its flexibility.

Physical design also plays a critical role in the 557’s appeal. The unit features a sleek, modern aesthetic that fits seamlessly into any contemporary audio setup. Its robust chassis not only provides a stylish look but also reinforces the device's durability and minimizes interference from external sources, which is vital for maintaining audio integrity.

Furthermore, the Meridian 557 is equipped with advanced filtering options that allow users to tailor the sound output according to their preferences. This feature enables audio enthusiasts to enjoy a personalized listening experience by adjusting settings to match different musical genres or individual tastes.

Overall, Meridian America 557 is a sophisticated digital-to-analog converter that combines advanced technologies with user-friendly features to deliver exceptional audio performance. Its commitment to high fidelity makes it an invaluable addition to any serious audio setup, appealing to both professionals and casual listeners alike.
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