Nobsound G2 PRO TPA3255 300W Subwoofer Power Amplifier - Compact HiFi

In this review the Nobsound G2 PRO TPA3255 stands out as a compact mono Class D amplifier aimed at listeners who need a powerful, dedicated subwoofer driver or a single-channel full frequency amp for compact systems. The biggest reason to consider it is the combination of the TPA3255D2 amp chip and a 32V/5A supply that delivers up to 300W, which gives clear, low-noise bass and enough headroom to drive passive subwoofers used in desktop, bookshelf or small home theater setups.

Key Features

• PBTL/SUB switch: Lets the G2 PRO operate as a full frequency mono amp or a focused subwoofer amp, adding versatility for different setups.
• Max 300W output: Powered by the TPA3255D2 and a 32V/5A supply, the unit provides strong, reliable output to drive passive subs and heavy-duty speakers.
• SUB output for active subs: A dedicated sub output allows easy connection to active subwoofers while still driving a passive driver on the main output.
• Adjustable crossover and gain: A gain switch with two output levels (32/36 dB) and a SUB frequency knob (40-300Hz) makes tonal and level matching straightforward.
• Protection and low-pass filtering: Built-in speaker protection and a low-pass filter reduce audible noise at high power and protect connected speakers.
• Compact aluminum chassis: Small footprint and durable metal housing suit desktop, bookshelf, ceiling or floor-standing system use without taking much space.

Who It's For

The Nobsound G2 PRO is best for audio hobbyists and home theater owners who need a powerful single-channel amplifier to drive a passive subwoofer or to dedicate a compact amp to a single full-range speaker. It is particularly useful where space is limited but strong low-frequency output is required, such as desktop systems, small living rooms and multi-amp installations where two units can be run as left and right channels.

Those who should look elsewhere include buyers seeking multi-channel amplification, integrated network streaming, or precise studio monitor reference equipment; the G2 PRO is focused on single-channel power and subwoofer control rather than a full feature network streamer or multichannel receiver.

Pros & Cons

Pros

• High output capability delivers satisfying bass impact and clarity for passive subwoofers and heavy speakers.
• Flexible PBTL/SUB mode and dedicated SUB output make it versatile for mixed active/passive setups.
• Adjustable crossover and gain provide useful system-level control without external processors.
• Compact, solid aluminum chassis fits well in desktop or small HiFi setups.

Cons

• Single-channel design limits use for stereo systems unless two units are purchased and configured.
• No onboard streaming or multichannel features, so additional components are needed for full systems.

Specifications

Output power	Up to 300W (mono)
Amplifier chip	TPA3255D2
Power supply	32V / 5A
SUB frequency range	Adjustable 40-300Hz
Gain settings	32 dB / 36 dB
Modes	PBTL (full frequency) / SUB (subwoofer)

Our Verdict

The Nobsound G2 PRO is a focused, high-value mono Class D amp for anyone needing a compact but powerful subwoofer or single-channel solution. With strong output from the TPA3255D2, adjustable crossover, and protections built in, it delivers good HiFi bass performance for desktop, bookshelf, and small home theater deployments, though buyers wanting stereo or streaming features will need additional components.

Frequently Asked Questions

Can this amp drive a passive subwoofer?
Yes. The G2 PRO is designed to drive passive subwoofers up to its rated power and includes a SUB mode and adjustable low-pass to tailor the output.

Does it work with active subwoofers?
Yes. There is a dedicated SUB output for connecting an active subwoofer while the amp drives a passive speaker or runs in PBTL mode.

Is it suitable for stereo systems?
It is a mono amplifier; two units can be used to drive left and right channels independently to avoid mutual interference.