NAD M28
NAD Masters M28 7-channel power amplifier, featuring Eigentakt technology, designed for demanding home cinema and multichannel setups.
Description
The NAD Masters M28 is a 7-channel power amplifier, designed to power multichannel home cinema or music systems requiring a substantial power reserve. It accepts balanced and unbalanced inputs and features quality speaker connection terminals, making it an amplification base for demanding speakers in a surround configuration.
It relies on Eigentakt amplification technology, developed by Purifi under licence to NAD. Each channel delivers 340 W RMS into 4 ohms, with a damping factor greater than 750 (reference 8 ohms, 50 Hz and 1 kHz), ensuring precise control of the speaker and well-controlled bass. The frequency response extends from 3 Hz to 100 kHz, reflecting a particularly wide bandwidth. The signal-to-noise ratio exceeds 120 dB (A-weighted, reference rated power, unbalanced), for a very quiet background during listening. The balanced input impedance of 47 kilohms facilitates pairing with a preamplifier or home cinema processor.
This model is aimed at home cinema and high-end multichannel system enthusiasts seeking a power amplifier capable of simultaneously driving several pairs of demanding speakers, for both music and film, with a high power reserve and excellent speaker control.
Technical specifications
| RMS power | 7x340 W (4 ohms) |
| Damping factor | > 750 (ref. 8 Ohms, 50 Hz and 1 kHz) |
| Frequency response | 3 Hz to 100 kHz |
| Input impedance | 47 kilohm (balanced) |
| Signal to noise ratio | > 120 dB (A-weighted ref. rated power, unbalanced) |
| Shipping weight | 21.2 kg |
What to check before buying used
On a multichannel power amplifier of this category, each of the 7 channels should be tested individually, both under load and unloaded, to rule out any fault localised to a single amplification module. Also check the condition of the speaker connection terminals and the balanced/unbalanced connectors, which are subject to wear from repeated connections. Checking ventilation and operating temperature after several tens of minutes of use ensures that heat dissipation remains normal.
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