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Nobsound G2 Mini 100W Mono Digital Amplifier Review

A $36.99 mono class-D amp with a four-level gain switch and adjustable bass cutoff, usable as either a 100W subwoofer amp or a full-frequency amp.

3.53.5 out of 5 starsUpdated October 14, 2026
$36.99Price checked October 14, 2026
Check price at Douk Audio
Nobsound G2 Mini 100W Mono Digital Amplifier

Our verdict

The G2 Mini is the cheapest way into Nobsound's mono class-D line at $36.99. It can be a full-range amp or a subwoofer amp at the flick of a switch, with a four-step gain control and an adjustable 40-300Hz cutoff to blend a sub into a system. It is mono, the peak power figure is quoted at 2Ω, and the 19V supply is optional, but as a compact bass amp or single-channel solution it is remarkably inexpensive.

Best for
Adding a small, adjustable bass amp to a system, or powering one speaker channel on a tight budget.
Skip if
You need stereo output, or you want the power supply bundled without selecting it at checkout.
Check price at Douk AudioHow we research

The Nobsound G2 Mini is a mono channel digital amplifier priced at $36.99, intended for home stereo systems as either a subwoofer amplifier or a full-frequency amplifier. It is a class-D design in a small aluminium chassis, and the listing describes it as simple and compact but practical and powerful.

A working mode switcher lets the G2 Mini run as a subwoofer bass amplifier or as a full-frequency amp. Two units can be used to drive left and right channels independently, with mutual interference between channels suppressed. The amplifier uses a Texas Instruments TPA3116 chip with an NE5532 op amp, which the maker says guarantees no audible noise, and the spec table quotes a maximum of 100W x 1 at 2Ω. Matched speaker impedance is listed as 2-8Ω, and the maker says it will drive most home passive speakers or subwoofers. There is also a built-in speaker protection circuit in the solid aluminium chassis.

Setup flexibility comes from two controls. A gain switch on the bottom of the amplifier offers four levels of output setting: 20dB, 26dB, 32dB and 36dB, which the maker says keeps the sound quality better and unaffected by the resistor parts. A built-in low-pass filter handles subwoofer integration, with bass cutoff adjustable from 40-300Hz and a -12dB slope. Quoted performance is a full-frequency response of 20Hz-20kHz (±3dB), THD of 0.03% at 1W output, SNR of at least 106dB and input sensitivity of 0.775V. The amp runs on DC 12-24V, measures 118.5 x 98 x 33mm, weighs 0.36kg, and the 19V power supply is optional at checkout.

Douk Audio ships worldwide with free and expedited options and prices that vary by destination country. Orders under 2kg ship by airmail (10-25 days) and anything over 2kg by DHL, UPS or FedEx (5-8 days); the G2 Mini is well under 2kg, so airmail applies. Import duties and customs charges are the buyer's responsibility. All items include 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.

What we liked

  • Mode switch lets it serve as a subwoofer bass amp or a full-frequency channel amp
  • Four gain steps (20/26/32/36dB) on the bottom panel, so it suits both weak and hot sources
  • Built-in low-pass filter with an adjustable 40-300Hz bass cutoff for dialling in a subwoofer
  • Two units can drive left and right channels independently, with interference between channels suppressed
  • Solid aluminium chassis with a built-in speaker protection circuit; SNR ≥106dB and THD 0.03% at 1W

Worth noting

  • Mono: one unit drives a single channel or subwoofer
  • The spec table quotes the 100W figure at 2Ω, so check your speaker or subwoofer impedance against that number
  • The 19V power adapter is a checkout option, so the base price version ships without one

Questions before you buy

Can the G2 Mini be used as a stereo amplifier?

No. It is a mono amplifier; two units can be used to drive left and right channels independently for stereo.

How do I adjust the subwoofer crossover?

The built-in low-pass filter has a bass cutoff frequency adjustment covering 40-300Hz with a -12dB slope.

What are the gain settings?

A switch on the bottom of the amplifier provides four output levels: 20, 26, 32 and 36dB.

Is a power supply included?

The amplifier is sold with or without a 19V power supply, so choose the appropriate variant at checkout.

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