Nobsound NS-03G SUB 100W Mono Subwoofer Amplifier Review

The Nobsound NS-03G SUB is a mono subwoofer amplifier priced at $46.99. It is the latest updated version of the model, with a simplified circuit, upgraded components and claimed improvements in sound quality.

The amplifier uses a classic TPA3116D2 class-D chip, with a maximum output power of 100W into a 4Ω load, and the maker says it easily drives most passive subwoofers. The TL072 op amp is chosen for ultra-low distortion and dynamic balance, and the quoted figures are THD of 0.01% or less and an SNR of at least 118dB, with input sensitivity of 280mV or below. The frequency range is listed as 20Hz-180Hz, which places it squarely in subwoofer duty.

A single 3.5mm AUX input is provided, and because there is a built-in preamplification circuit, sources with low signal output such as phones, TVs, MP3 players, CD players, computers and amplifiers with a low-frequency output can all feed it. Speaker connection is through banana jacks, and the matched subwoofer impedance is 4-8Ω. The amplifier measures 69 x 88 x 33mm and weighs 190g, with a black aluminium alloy case, and the design includes protection circuitry described as spark-free and shock-free. The listing offers the amplifier either alone or with a 19V/4.74A power supply, so check which version you are buying.

Douk Audio ships worldwide with free and expedited options and country-based pricing. Orders under 2kg ship by airmail in 10-25 days and over 2kg by DHL, UPS or FedEx in 5-8 days; even with the power adapter the package weighs well under 2kg, so airmail applies. Customers pay any import duties or customs charges. All items carry a 30-day free return or full refund and a 1-year warranty, excluding orders placed by mistake, man-made damage or misuse, a subjective change of mind, and anything else outside the warranty terms.