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The sub then, quite a unit, not too huge, nice and stylish. This is a 120W, 4th order band-pass subwoofer. And we concur, it provides a quite powerful and deep bass, even at high volumes this thing can take an immense pounding as it will not distort quickly.

The subwoofer unit houses the custom-designed, high efficiency power supply unit, the two-stage amplifier for the sub itself, and the four Class D digital amplification circuits for the bi-amplified two-way satellite speakers.

And here's where we'll quote Corsair:

" The Corsair Gaming Audio Series SP2500 utilizes a sophisticated 4th orders band-pass subwoofer design, rather than the ported bass-reflex design that is commonly used in competing systems. In a 4th order bandpass system, the driver unit is placed in a sealed chamber. This is also known as acoustic suspension and allows the driver to create bass tones with very low levels of distortion.

The driver unit fires into a separate, ported chamber, which creates an acoustic filter that only passes a set range of frequencies (hence the name band-pass), and rejects frequencies outside this band, significantly reducing audible distortion. This subwoofer design has greater power handling capabilities compared to ported bass-reflex subs, and delivers more authoritative, punchier and more detailed bass. It also has a better transient response, meaning that sudden, dynamic changes in audio, such as explosions in games or fast drum solos, are delivered with far greater punch, attack and clarity ".

On the backside the wiring is located, a power connector, bi-amp speaker connections, control pod RS232 connector and your PC / audio inputs over mini jack or RCA. No digital inputs are available, but for a 2.1 kit... not really needed either.