Nobsound G2 PRO 300W Mono Digital Power Amplifier Review

The Nobsound G2 PRO is a mono digital power amplifier priced at $64.99. It is a compact class-D design that can do double duty as a full-frequency amplifier or a dedicated subwoofer amplifier, depending on how you set it up.

The PBTL/SUB switch is the heart of that flexibility. In subwoofer mode, a dedicated SUB output is provided for an active subwoofer, and the amp can connect to both passive and active subwoofers. Two G2 PRO units can also be used to drive left and right channels independently to avoid mutual interference. Output power reaches a maximum of 300W from a TPA3255D2 amplifier chip, and Douk Audio says the included 32V/5A supply provides enough power to drive 320W passive speakers or subwoofers, with good matches from outdoor and bookshelf speakers through to computer, desktop, ceiling and floor-standing models.

Tuning options include a gain switch with two output level settings, 32dB or 36dB, and a sub frequency adjustment spanning 40-300Hz with a -12dB slope for blending a subwoofer into a system. A built-in speaker protection circuit and low-pass filter are there to keep noise inaudible even at high output, and the SUB signal and amplified output can run at the same time. The quoted specs are a full-frequency response of 20Hz-20kHz (±3dB), THD of 0.03% at 1W output, SNR of at least 106dB, input sensitivity of 0.775V and matching speaker impedance of 4-8Ω. It works on DC 24-48V, measures 127 x 118 x 35mm, weighs 0.5kg, and comes with the 32V/5A power supply in the box.

Douk Audio ships worldwide with free and expedited options and prices that vary by country. Packages under 2kg ship by airmail (10-25 days) and anything over 2kg by DHL, UPS or FedEx (5-8 days); the G2 PRO plus supply stays under 2kg, so airmail is the usual route. Import duties and customs charges are the customer's responsibility. All items carry a 30-day free return or full refund and a 1-year warranty, with exclusions for orders placed by mistake, man-made damage or misuse, a subjective change of mind, and anything else outside the warranty terms.