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The NHB-108 Model Two is darTZeel's ultra-fast, dual-mono, solid-state power amplifier in the NHB series. It uses two separate power supplies, transformers, audio circuits, and cooling systems to realize a true dual-mono topology while remaining a stereo power amp. It offers three analog input options: RCA, balanced XLR, and darTZeel's proprietary 50-ohm BNC Zeel interface, each with high input impedance for conventional line-level use except the Zeel current-mode input. Nominal output power is specified at 150 watts RMS per channel into 8 ohms and typically 225–250 watts RMS into 4 ohms, depending on the published spec set, with 26 dB power-stage gain into 8 ohms. The output stage is a very wide-bandwidth, class‑AB solid-state design with extremely low output impedance (≈0.33 ohms from 20 Hz to 20 kHz), yielding excellent speaker control and linearity. Its patented circuit architecture minimizes or eliminates global negative feedback, aiming to preserve signal integrity, timing, and microdynamics while maintaining low measured distortion. Frequency response is rated from about 0.8 Hz to 600 kHz (+0/–3 dB), with rise time under 0.8 µs and slew rate above 88 V/µs, reflecting the amplifier’s ultra-wide-bandwidth, high-speed behavior. The chassis features the brand’s distinctive gold anodized aluminum front panel, red heatsink fins, and a glass top cover, with overall dimensions around 440 × 170 × 350 mm (W × H × D) and net weight about 30 kg. Idle power consumption is roughly 50 W, rising to around 900 W at maximum output, so appropriate ventilation and mains provision are recommended. Designed as a reference-level amplifier, the NHB‑108 Model Two is positioned as a centerpiece for high-end systems, intended to drive a broad range of loudspeakers while emphasizing clarity, transient accuracy, and an unforced, highly resolving presentation.
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
Components that show up alongside the NHB-108 Model Two in real systems. A verdict means the pair has been checked for compatibility and headroom — open it to see how the two get along.
Every pairing for the NHB-108 Model TwoThe closest alternatives on specs, description and the systems they turn up in, with the specs they share set side by side.
The NHB-458's power @ 8ω is 450W against the NHB-108 Model Two's 150W, its power @ 4ω 800W against 225W, and its signal-to-noise 115 dB against 92 dB. Both share thd (1.000%).
Both turn up in the same documented systems.
The Mephisto's power @ 8ω is 175W against the NHB-108 Model Two's 150W, its power @ 4ω 350W against 225W, and its signal-to-noise 111 dB against 92 dB. Both share thd (1.000%).
The CTH-8550 Mk2's power @ 8ω is 200W against the NHB-108 Model Two's 150W, its power @ 4ω 330W against 225W, and its signal-to-noise 115 dB against 92 dB. Both share thd (1.000%).
The SM011's power @ 8ω is 200W against the NHB-108 Model Two's 150W, its power @ 4ω 400W against 225W, its signal-to-noise 110 dB against 92 dB, and its thd 0.010% against 1.000%.
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