NAD C328 (production years unknown)

The NAD C328 is a HybridDigital integrated amplifier — NAD taking the philosophy of its famous 1978 3020 and updating it for the digital age. The connection to the 3020 is explicit: coverage of the C328 introduces it as an integrated amplifier rooted in the 3020, and NAD's "the simpler the better" doctrine runs through the whole design.

Where the 3020 used a class-AB output stage, the C328 uses a customized version of Hypex's UcD module operating in class D. These aren't stock boards — NAD specialists modified them in-house — and "HybridDigital" refers to feeding an analog signal into the PWM amplifier section. Power is rated at 50W continuous into both 8 and 4 ohms, with one manual-derived listing citing peak power at 210W per channel, THD at 0.005%, and signal-to-noise at 100dB. StereoLife Magazine singled out the same Hypex-based design, praising the C328's deep reservoir of power and describing distortion and noise in the audible range as nearly unmeasurable.

Inputs are practical rather than lavish: MM phono, analog line in, coaxial and optical digital, plus Bluetooth feeding the built-in hybrid digital DAC. A subwoofer output and a dedicated headphone amplifier cover the modern bases. The included remote is a simple, obviously inexpensive unit, and the NAD Remote app is supported. The owner's manual also documents Auto Standby, Auto Sense, and infrared learning.

What isn't documented: production years and original price don't appear in the archive's sources. The used-market record is thin — one classified listing at $325 for a refurbished unit whose owner reported no problems and was selling only because new speakers needed more power.

Known specs: