10 Amplifiers for Smarter Hi-Fi System Building

The Amp Box RS2 combines a discrete Class AB output stage with one 6922 triode tube per channel in its preamplifier stage.

It is rated at 80 watts per channel into eight ohms and 130 watts into four ohms, giving it useful stereo output from a compact enclosure.

Bridging the channels turns it into a mono power amplifier rated at approximately 350 watts into eight ohms, making future system expansion possible. Its full-metal case is also designed to distribute and dissipate heat, while black and silver finishes provide two visual options.

The Crius H5S consolidates a solid-state headphone amplifier, dual-mono DAC and fully balanced preamplifier into a 210mm-wide enclosure.

Its four headphone sockets accommodate a range of physical connections, while balanced and unbalanced analog inputs and outputs extend its usefulness beyond private listening.

Digital and analog sources can share the same control center, and the line-level outputs allow the Canor to feed active speakers or a separate power amplifier. An internal power supply also avoids adding an external power brick to a compact desktop installation.

The Omnia A300 is designed to replace several components by combining a Class D integrated amplifier, DAC and network player.

It is rated at 150 watts into eight ohms and 200 watts into four ohms, yet its chassis measures 280 x 55 x 250mm and weighs 3kg.

Optical, coaxial, HDMI I2S, analog RCA and Ethernet connections are joined by Wi-Fi and Bluetooth, while preamplifier and optical outputs add system flexibility. Network playback supports services including Qobuz, Spotify and Tidal, with operation handled through NuPrime’s application.

The Canta Integrated takes an all-analog approach, combining a Class A tube preamplifier with MOSFET power stages.

One 6SN7 triode per channel provides voltage gain, while the solid-state output section supplies the current for loudspeakers.

Rated output is 125 watts per channel into eight ohms and 250 watts into four ohms. Four line-level inputs accommodate analog sources, and a 100-step resistor-ladder volume control provides fine adjustment. With no digital section described in the source, its appeal is strongest in systems where conversion and streaming are handled elsewhere.

Developed with Starke Sound, the AMP-F2 is a Class D power amplifier built around the NS600 module.

It is specified to deliver up to 250 watts per channel into four ohms at 1 percent THD in stereo operation.

Bridge mode changes it into a mono amplifier rated at 450 watts into a two-ohm load at the same stated distortion level. A 5–12V trigger input and 3.5mm trigger output allow its power state to follow other compatible components, which is useful when the amplifier is installed as part of a coordinated separates system.

The Aegir 2 is a moderate-output stereo power amplifier rated at 30 watts into eight ohms and 50 watts into four ohms.

Its mixed-feedback topology combines current and voltage feedback, while Schiit’s Continuity output-stage circuit is intended to improve performance over the preceding model.

The linear power supply uses a 600VA transformer, 16 Schottky diodes and five stabilizers. Schiit also specifies noise below -122dB and standby consumption of 1–2 watts, making the design notable for both its substantial power-supply hardware and restrained standby demand.

Despite its article title, the No.

523 is an analog preamplifier rather than a speaker-driving integrated amplifier.

Its six inputs comprise two balanced and three unbalanced line-level connections plus a configurable Pure Phono input. The phono section supports both moving-magnet and moving-coil cartridges, with multiple capacitance, gain and resistive-loading settings. Balanced and unbalanced stereo outputs serve a separate power amplifier, while the front-panel Class A Main Drive circuit handles headphones up to 32 ohms. Ethernet, RS-232, USB control, 12V triggers and infrared input support installation in a wider system.

The MC351 combines digital conversion, Class D amplification and 2.1-channel support in a compact integrated design.

Bluetooth, USB, optical and coaxial inputs provide several routes for digital sources, and a single control switches among five input modes.

Its published 2.1 output rating reaches 165 watts for each stereo channel plus 350 watts for the additional channel. Bass and treble controls permit direct tonal adjustment, while automatic standby activates after two minutes without a signal. A miniature round VU meter gives the front panel a deliberately retro visual element.

The Boulder 1162 is a dedicated stereo power amplifier rated at 300 watts per channel into eight ohms.

Its bias circuit operates in Class A, while newly developed protection circuitry is designed to shut down the output stage if speaker-cable shorts or system faults are detected.

Four pairs of high-current speaker terminals simplify bi-wiring arrangements. Internally, dual power transformers use DC filtering and sit inside a welded steel enclosure. This is a specialized separates component for systems that already have source selection, volume control and preamplification covered.

The IDA-9 combines a hybrid Class A+D amplifier with a built-in DAC and a GaN switching power supply.

Its compact 235 x 281 x 55mm chassis is rated to deliver 150 watts per channel into eight ohms.

The digital section accepts PCM up to 32-bit/384kHz and DSD256 through USB Type-B, with optical and coaxial S/PDIF inputs also provided. An analog line input accommodates a conventional source, while the line output can serve equipment such as a subwoofer. Streaming is not listed as built in, but an expansion port supports optional Bluetooth or streaming modules.