Positive Grid Spark Modelling Combo

Positive Grid Spark 40 BK — A Smart Modeling Combo for the Connected Player

The Positive Grid Spark 40 BK is a 40-watt stereo modeling combo that integrates amp, USB audio interface, and Bluetooth speaker in one enclosure. Full-range sound emerges from two custom 4" speakers and a tuned bass-reflex port, while the Spark App provides Smart Jam Live, Auto Chords, and a YouTube-enabled practice library.

Smart Practice Features That Set It Apart

What distinguishes this model from conventional amps is its companion app. Authentic bass and drum accompaniments are created in real time by Smart Jam Live. Auto Chords displays live chord charts for millions of YouTube songs and lets you slow the tempo while preserving pitch. Hands-free streaming and backing track control is possible with voice commands.

Power and Speaker Configuration — Room-Filling Stereo Output

A 40-watt Class D stage drives a pair of custom 4" speakers through a bass-reflex cabinet, achieving a maximum SPL of 109 dB RMS from 20 Hz to 20,000 Hz.

• Power Output: 40 W Class D — this stage provides headroom for small gigs and efficient operation.
• Speakers: 2 × 4" custom design — stereo configuration with a tuned bass-reflex port for full-range response.
• Fill a small room with up to 109 dB RMS / 116 dB peak sound without distortion.

Tone Engine and Effects — BIAS-Powered Modeling

The top-panel tone stack offers hands-on control across two channels, and the BIAS-powered engine allows for deeper editing via the app. Thirty-three amp models suit electric, bass, and acoustic tones, while forty-three effects include noise gate, compressor, distortion, modulation, EQ, delay, and reverb.

• Amp Models: 33 onboard — provides electric, bass, and acoustic voicings in one unit.
• Effects: 43 onboard — covers noise gate, compressor, distortion, modulation, EQ, delay, and reverb.
• The analog-style control surface features Amp Type, Gain, Bass, Mid, Treble, Master, Mod, Delay, Reverb, Music Volume, four programmable presets, and a tap/tuner button.

Connectivity and Build — Recording-Ready and Travel-Friendly

A 1/4" guitar input welcomes your instrument, while 1/8" aux input and Bluetooth stream backing tracks. Use the rear-panel USB as a 1-In / 2-Out interface for direct DAW recording, and a 1/8" headphone output for silent practice. Mains power is ideal for home and studio, not battery sessions.

• Wireless: Bluetooth audio — play backing tracks from your phone or tablet and connect to the Spark App.
• USB Audio: 1 In / 2 Out interface — record guitar and stereo playback directly into any DAW.
• Dimensions: 350 × 180 × 190 mm — compact enough for a desk with a removable faux-leather handle.
• Weight: 5.2 kg — portable for daily moves between home and studio.

Who Is It For — Home Practice, Learning, and Mobile Recording

The Spark 40 BK suits guitarists and bassists wanting a single device for practicing, learning, and home recording without a pedalboard stack. Beginners use Auto Chords and the YouTube library to access real-time chord charts and slow difficult passages. Intermediate players gain clean pedal-platform tones and a broad effects library, while songwriters can record ideas straight to DAW via USB.

Positive Grid — From San Diego to the Smart Amp Era

Founded in San Diego, California in 2013, Positive Grid set out to bridge mobile tech and analog feel for guitar and bass. Industry recognition came with the BIAS FX 2 platform before hardware like the Spark Amp series. This combo represents the original "smart amp that started it all," joining a renowned tone engine with smart features and a dedicated app.