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The Acurus DIA-100 mkII is a stereo integrated amplifier that combines a passive line-level preamp with a high-gain power amplifier in a single chassis, delivering 100 watts per channel into 8 ohms with low total harmonic distortion (THD) around 0.09%. Drawing directly from the DIA-100 architecture, the mkII version retains the passive preamp concept - using high-quality selector, volume, and balance controls without an active gain stage, phono section, or tone controls - to preserve signal purity and minimize coloration. Internally, it uses a substantial toroidal power transformer and large reservoir capacitors in a single shared power supply feeding both channels, along with multiple Toshiba bipolar output devices in the output stage, closely mirroring the topology of Acurus' separate stereo power amplifiers. Inputs are strictly analog line-level, typically six RCA input pairs (e.g., CD, D/A, tuner, auxiliary, and two tape loops), plus tape monitor/record routing, with gold-plated RCA jacks and robust multi-way speaker binding posts that accept bare wire, spades, or banana plugs. The front panel presents a brushed metal faceplate with simple, function-driven controls and no display or digital interface, and the amplifier operates on 120V AC in standard North American versions. There is no remote control and no digital inputs; the unit is intended as a straightforward, high-value analog integrated amplifier whose reputation is built on clean, dynamic sound, ample power for typical home speakers, and reliable long-term operation, rather than on convenience features. The DIA-100 mkII is long out of current production but remains popular on the used market among listeners seeking a minimalist, high-gain solid-state integrated amplifier with strong performance per dollar.
Amplification power output and characteristics
Analog signal output specifications
Input and output connections
Size, weight, and appearance
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions
The closest alternatives on specs, description and the systems they turn up in, with the specs they share set side by side.
The RA-985BX's signal-to-noise is 97 dB against the DIA-100 mkII's 100 dB, its power @ 4ω 190W against 150W, and its damping factor >400 against >300. Both share power @ 8ω (100W).
The A-S1000's power @ 8ω is 90W against the DIA-100 mkII's 100W, its power @ 4ω 140W against 150W, its signal-to-noise 98 dB against 100 dB, and its damping factor >100 against >300.
The A10MKII's power @ 8ω is 50W against the DIA-100 mkII's 100W, its signal-to-noise 90 dB against 100 dB, its power @ 4ω 60W against 150W, and its thd 0.030% against 0.090%.
The 2004's power @ 4ω is 200W against the DIA-100 mkII's 150W, its signal-to-noise 110 dB against 100 dB, and its thd 0.050% against 0.090%. Both share power @ 8ω (100W).
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