Amplifiers Worth Considering, from Compact Streaming Models to High-End Powerhouses

The Denon HEOS Amp HS2 is intended to power a pair of passive speakers within a HEOS multiroom system.

Its two-channel Class D stage is rated at 100 watts per channel, with high-current output and compatibility with low-impedance speakers.

The compact enclosure has minimal front-panel controls, leaving comprehensive operation to the HEOS application for iOS and Android. File support includes FLAC and uncompressed WAV alongside MP3, WMA and AAC, making this a network-focused amplifier for listeners already using, or planning to build around, the HEOS platform.

Cambridge Audio’s EXA100 is a full-size integrated amplifier rated at 100 watts per channel in Class AB.

Its amplifier modules are based on those used in the company’s Edge M power amplifier, and Cambridge says the two models also share monoblock power transistors.

System flexibility is a central strength: the EXA100 provides balanced XLR and three RCA inputs, a headphone connection, preamplifier and subwoofer outputs, and connections for two pairs of speakers. HDMI eARC, coaxial and two optical inputs extend that versatility to televisions, streamers and other digital sources.

The Klipsch ProMedia Heritage 2.1 is not a standalone amplifier but a complete active desktop system with two satellites and a separate subwoofer.

Class D amplification supplies 35 watts to each satellite and 150 watts to the eight-inch subwoofer.

The satellites combine one-inch compression tweeters with Tractrix Horn waveguides and four-inch midrange drivers, while the MDF cabinets adopt styling associated with classic Klipsch speakers. USB, Bluetooth and stereo RCA connectivity allow it to serve computers, mobile devices and conventional analogue sources without an external amplifier.

Fosi Audio’s DA-2120C places Class D amplification, digital conversion and wireless reception in a compact component.

It is rated at 2 x 90 watts into a four-ohm load and accepts USB-B, optical, coaxial and stereo RCA sources, in addition to Bluetooth 5.0 with aptX HD support.

Speaker terminals are accompanied by an RCA output for an active subwoofer, allowing the amplifier to anchor a 2.1 system. A display shows playback information, while the supplied remote provides source selection, treble, midrange and bass adjustment, and access to EQ modes.

This is an advance look at two forthcoming Constellation Audio product lines rather than an assessment of a finished amplifier.

Reference 2 is positioned directly below the company’s Statement series and is described by Constellation as using premium materials, components and current audio technology.

Performance 2 is introduced alongside it, but the available preview does not disclose the individual components in either range. Technical specifications, prices and delivery details are also absent, so there is not yet enough information for meaningful system matching or comparison with established amplifiers.

The Anthem STR is a dedicated stereo power amplifier built around two toroidal transformers and a fully dual-mono architecture.

Anthem’s Advanced Load Monitoring system continuously tracks internal temperature, current and voltage, while a front graphic display presents power levels and operating status.

The Class AB output stage uses sixteen bipolar output devices per channel, supported by hand-selected and matched critical transistors. Output reaches as much as 800 watts per channel into a two-ohm load, and flexible trigger and signal-sensing options reduce the need for manual power control in an integrated system.

DIGMA’s D-PS1500 and D-PS1505 are portable Bluetooth speakers rather than components for a separates-based amplifier system.

The smaller D-PS1500 combines a 10-watt amplifier with a 500 mAh battery rated for up to five hours of playback.

The D-PS1505 increases output to 20 watts and uses a 1200 mAh battery rated for seven hours. Both have LED lighting, Bluetooth 5.0 and FM radio, while two D-PS1505 speakers can be paired as a wireless stereo system. Integrated handles and low stated weights reinforce their emphasis on portability.

Designer Dakd Jung’s wireless speaker is primarily an experimental visual object.

A circular glass display contains ferromagnetic fluid that changes shape in response to variations in the magnetic field during music playback, producing an effect compared in the source to a lava lamp.

The visualization system is based on an Arduino Nano platform, while several upward-facing speakers and a compact amplifier handle audio reproduction. Its 3D-printed enclosure is styled as a contemporary home device, but no amplifier rating, acoustic measurements, price or commercial availability information is provided.

The TAD M1000TX is a two-channel power amplifier in the company’s Evolution Series, offered in black and silver and weighing 29 kilograms.

It replaces the earlier M1000 with redesigned circuit topology and power transformers.

A bridge-tied load configuration places two separate amplifiers in a balanced arrangement for each channel, extending that balanced approach from input to output. Positive and negative power supplies are arranged symmetrically, and the power-supply circuits are separated by channel. The design emphasis is therefore on electrical symmetry and isolation rather than added source features or integrated controls.

This entry is a survey of eight high-end stereo power amplifiers rather than a single product.

The supplied section focuses on the McIntosh MC462, whose quad-balanced circuit is rated to deliver 2 x 450 watts into two-, four- or eight-ohm loads.

McIntosh specifies a signal-to-noise ratio of 122 dB and total harmonic distortion of 0.005 percent. Traditional level meters, blue illumination, separately housed transformers and protective glass give it the familiar McIntosh presentation. As a wider selection article, the piece is most useful for identifying candidates before examining system compatibility and individual model details.