The Practice Amp That Plays Along With You
You know that feeling when you're noodling at home, wishing you had a drummer to lock in with? The Positive Grid Spark 40 was basically built for that moment. It's a 40-watt modeling combo amp that packs 33 amp models and 43 effects into a compact desktop package — and then goes further with Smart Jam, a feature that listens to your chord progressions and generates a live backing track on the fly. Bass, drums, real-time accompaniment. No click track required.
The Spark works beautifully as a standalone amp right out of the box, with straightforward knob controls for Gain, Bass, Mid, Treble, Master, Mod, Delay, and Reverb. Four onboard preset buttons put your favorite tones within reach instantly. But pair it with the free Spark app on iOS or Android, and the whole thing opens up — 50,000+ community presets on ToneCloud, Auto Chords for real-time song learning, voice control, and a full 1-in/2-out USB audio interface for recording straight into your DAW.
Whether you're working through new songs, laying down ideas, or just enjoying a late-night session through the headphone output without waking anyone up, the Spark 40 handles all of it from one compact, 11.5-pound box.
40 Watts, Two 4-Inch Speakers, and More Room-Fill Than You'd Expect
The Spark's stereo speaker setup — two custom-designed 4-inch drivers in a bass-reflex enclosure — delivers a surprisingly full sound for its footprint. The stereo image gives chord work and clean tones a lot of dimension, and the low end holds up well whether you're running a clean jazz tone or a heavy rhythm sound.
At 40 watts of Class D power, the Spark has more than enough headroom for home practice, apartment jams, and even some small room use. It won't replace a stage rig, but it doesn't need to — this is a desktop amp designed to sound great at living-room volumes, and it does exactly that.
33 Amp Models, 43 Effects, and a World of Presets
The Spark's onboard modeling library covers electric guitar, acoustic guitar, and bass amp types — clean, glassy, crunch, hi-gain, metal, acoustic, and bass voicings are all represented. The 43 built-in effects span Noise Gate, Compressor, Distortion, Modulation/EQ, Delay, and Reverb, and the controls are laid out clearly enough that dialing in a usable sound takes seconds, not sessions.
Connect to the Spark app and that library expands dramatically. ToneCloud gives you access to over 50,000 presets crafted by players, producers, and engineers around the world. Browse by genre, artist, or style, or upload your own builds to share. The Auto Chords feature is genuinely useful for learning songs — import something from your streaming library and the app displays real-time chord sheets as it plays.
Built-In Audio Interface and Bluetooth Connectivity
The rear panel keeps things practical: USB port, AUX in, and DC in. The USB connection doubles as a 1-in/2-out audio interface, so you can record directly into any DAW without buying additional gear. The 1/8-inch headphone jack handles silent practice, and Bluetooth lets you stream audio from your phone or tablet to jam along with your favorite songs.
The Spark app adds voice control on top of all that — speak a command like an amp name or genre, and the amp responds. It's the kind of convenience that feels a little gimmicky until you actually use it during a session and realize you never have to stop playing to find a tone.
Product Features:
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Power: 40-watt Class D amplifier
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Speakers: Two custom-designed 4-inch speakers, stereo, bass-reflex cabinet
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Amp Models: 33 amp models covering electric, acoustic, and bass voicings
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Effects: 43 effects including Noise Gate, Compressor, Distortion, Modulation/EQ, Delay, and Reverb
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Presets: 4 programmable onboard preset buttons plus 50,000+ ToneCloud presets via the Spark app
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App Features: Smart Jam live backing tracks, Auto Chords real-time song learning, and voice control via the free Spark app (iOS and Android)
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Audio Interface: USB 1-in/2-out interface for direct DAW recording
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Connectivity: Bluetooth audio streaming, USB, 1/8-inch AUX input, 1/4-inch instrument input, 1/8-inch headphone output
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Controls: Gain, Bass, Mid, Treble, Master, Mod, Delay, Reverb, Output Volume, Music Volume, Tap/Tuner button
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Weight: 11.5 lbs
Brand: Positive Grid
Model: Spark
SKU: SPARK
Condition: New
Since 1872, C.A. House Music has been helping musicians across the Ohio Valley find the right gear -- with real advice from a team that actually plays. We're your authorized dealer of all the big names in guitars, keyboards, band instruments, drums, pro audio, and more. With four family-owned and operated locations in Ohio and West Virginia (plus a full online store), you don't have to go far for instruments, lessons, rentals, and repairs. No matter your musical needs, our team of musicians wants to help you Play Music for Life.
