Nobsound G2 PRO 300W TPA3255 Subwoofer Mono Amplifier

The Nobsound G2 PRO TPA3255 is a compact Class D mono amplifier delivering up to 300W optimized for driving passive subwoofers or serving as a full-frequency single-channel Hi‑Fi amp.

Designed for home and desktop audio systems that need powerful low-frequency output without bulky gear, the G2 PRO pairs Texas Instruments' TPA3255-class amplification with a dedicated SUB mode and adjustable crossover controls. Its compact aluminum chassis houses protection circuits and a switchable operating mode, enabling flexible use with active or passive subs, or as an independent mono amplifier in multi-amp setups.

How does the G2 PRO improve bass performance in my system?

The G2 PRO provides a selectable SUB mode and an adjustable low-pass filter so you can dial in the subwoofer’s crossover point for tighter, more accurate bass. Built-in protection circuitry prevents audible distortion at high output, helping the sub stay clean under load.

• SUB mode with dedicated SUB output for active subwoofers
• Low-pass frequency adjustment from 40–300 Hz to match speaker response
• High output headroom from the TPA3255 amplifier topology
• Protection circuit reduces clipping and audible artifacts

Can I use the G2 PRO with passive speakers or only with subwoofers?

The G2 PRO is versatile: flip the PBTL/SUB switch to operate as a full-frequency mono amplifier or as a subwoofer-dedicated amp. It can drive passive subwoofers directly or feed active subs via the SUB output, and two units can run left and right channels independently for stereo setups.

• PBTL (full-frequency) mode powers passive speakers and subwoofers
• SUB mode outputs a filtered low-frequency signal for active subs
• Compatible with bookshelf, floorstanding, ceiling, and outdoor speakers
• Use two G2 PRO units to separate left/right channels and avoid interference

What controls and connections let me tune the sound?

The front and rear-panel controls let you set gain levels and the low-pass cutoff so the amplifier integrates smoothly into varied systems. Two gain settings provide headroom options for efficient speakers or high-sensitivity drivers, while the SUB frequency knob helps match crossover points quickly.

• Gain switch with two output levels (approx. 32 dB and 36 dB) for level matching
• SUB frequency adjustment knob covering 40–300 Hz for precise crossover tuning
• RCA I/O for source connection and dedicated SUB output for active subs
• Compact aluminum chassis with durable controls and protection features

Who is this for? The Nobsound G2 PRO suits audiophiles and hobbyists who want powerful, tunable low-frequency performance without a large footprint: desktop audio enthusiasts, compact home theater builders, and anyone assembling a multi-amp stereo rig using mono amplifiers. Its flexible PBTL/SUB switching, adjustable low-pass filter, and built-in protection make it a practical choice for driving passive subwoofers or adding a dedicated mono amplifier to stereo setups.