Often envied, never equalled. The NHB-108 is the ultimate dual-mono amplifier. Get ready for an audio experience that you've «Never Heard Before».

  • Category: Power Amp


The NHB-108 was the first power amplifier designed and built by darTZeel.

The NHB-108 has earned legendary status among critics and music lovers alike. Its immediate success and multiple awards helped to quickly establish darTZeel in the premium market.

Regularly updated over a number of years and now reinvented in a «model two» version, this ultra-rapid, dual-mono amplifier is the high-end offering in the NHB series.

With power output of 150 watts per channel and its circuits patented worldwide that prevent global negative feedback, the NHB-108 model two connects effortlessly with any type of speaker, unleashing its full magic and capability.


With two power supplies, two transformers, two audio circuits, and two coolers, the darTZeel model two is very much a dual-mono power amplifier in every respect.

The power supply cord is the only sign that everything is housed within the one chassis.

Technical data

Nominal Output Power

150 watts RMS @ 8 ohms
225 watts RMS @ 4 ohms

Power Stage Gain

26 dB @ 8 ohms

Analog Input Impedances

BNC Zeel 50 ohms, 1 Hz to 1 MHz
RCA line > 30 kohms, 5Hz to 100kHz
XLR > 30 kohms

Speaker Output Impedance

< 0.33 ohms from 20 Hz to 20 kHz (measured under 8 ohms)

Frequency Response

0.8 Hz - 600 kHz, +0, -3 dB

Rise Time

< 0.8 µs

Slew Rate

> 88 V/µs, peak-peak

DC Output Voltage

± 50 mV

Total Harmonic Distortion (THD)

< 1 % from 7 Hz to 77 kHz within the output dynamic range

Temporal Distortion

None, at any level and load, as specified above


< - 90 dB from 20Hz to 20kHz

Signal to noise ratio

> 112 dB (A) @ nominal power

Power consumption

50 watts @ idle, 900 watts @ maximum output power

Size in mm

440 x 350 x 170 (WxDxH). Total deep with handles : 415mm

Size in inches

17.32 x 13.78 x 6.7 (WxDxH). Total deep with handles : 16.4 inches

Net weight

30 kg