Positive Grid Spark GO Guitar Amplifier

The Positive Grid Spark GO makes the most sense as the amp you reach for when setting up a larger one feels disproportionate to the task. Ten minutes working on a chord change does not need to become a small production. At 125 × 85 × 45 mm and 346 g, this is a guitar amp with very little physical ceremony attached.

Its defining appeal is the combination of that small enclosure and a much broader tone palette than four preset buttons might suggest. There are 33 amp models and 43 effects available, with four customizable onboard presets. That gives a guitarist room to explore different sounds without assembling a pedalboard just to find out whether today's riff wants more gain. The numbers describe choice, not a guarantee that every model will become a favourite; the useful part is having those choices in something this compact.

The division between amp and app matters. You can use the four factory presets without the Spark app, so basic playing does not require a phone beside the guitar. Creating or accessing additional tones does require it. That makes the onboard controls a convenient way to return to selected sounds, rather than a complete substitute for the app. Players who enjoy editing on a screen will find the arrangement more appealing than those who consider a phone the sworn enemy of practice time.

Battery power is the other reason this format works. The built-in 2500 mAh battery is rated for up to eight hours at mid volume or lower, with a stated two-hour charging time over USB-C. The volume condition deserves attention, but the proposition is still useful: a rechargeable amp that can move between practice spots without needing a nearby outlet.

There are also two distinct ways to listen. The custom 2-inch speaker is mono and sits in a passive-radiator cabinet; the headphone output is stereo. Headphones make it useful when the household has already heard quite enough of the same four bars. Bluetooth audio adds another playback option, while USB recording gives the GO a role at a computer. Its 1-input, 2-output interface runs at 44.1 kHz and 16-bit: a straightforward recording connection, not a multi-input studio hub.

The hard boundary is speaker output. This is a 5-watt Class D amp with a maximum stated level of 82 dB SPL at one metre. It belongs in the solo-practice conversation, not in a contest with an enthusiastic drummer. Buying it as a miniature replacement for a rehearsal amp would miss its purpose.

As a second amp, though, the Spark GO has a persuasive job description: keep a selection of guitar sounds close at hand, allow private listening, and offer a route into recording. Its appeal is not that it does everything. It makes the modest, repeatable act of picking up the guitar easier to accommodate.