Owners call it a fantastic-value bedroom practice amp with impressive app-driven tones, though some hit reliability quirks like hiss or dropouts and note it isn't loud enough for gigs.
54% of 52 verified owners recommend the Positive Grid Spark 40, based on real owner verdicts aggregated from Reddit, enthusiast forums, and YouTube.
239 comments reviewed · scored on the 52 clearest verdicts
54%
Recommend
28 owners
4%
Neutral
2 owners
42%
Don't recommend
22 owners
Last 6 months:44% recommend(9 recent verdicts)→ holding steady vs older reviews
Source
Breakdown
Score
N
Counted in the score
Reddit
46%
37
Other forums
73%
15
Reviewed, but not counted — and why
YouTubeiOrdinary owner comments (not the reviewer), but here they sit too far from the owner consensus on Reddit and forums — channel comment sections can skew heavily positive or negative by trend — so they're shown for perspective and kept out of the score.owner comments
93%
58
Affiliate blogsiThese blogs earn a commission when you buy. Across our data they rate products ~35 points more positively than actual owners — shown for transparency, never counted in the score.paid commission
100%
3
No clear verdictiGood-to-know notes — setup, tips, and things to watch for. We use them for the pros, cons, and who it's for, but they don't reflect a definitive opinion on the product, so they're never counted in the score. See the 'Good to know' section below the quotes.Setup, tips & quirks
—
2
Affiliate blogs here say 100% recommend, while the owner-based score is 54%. They earn a commission on every sale — so we show them for transparency but never let them move the score.
The headline score reflects owners (Reddit, enthusiast forums), independent lab tests, blogs with no affiliate links, and YouTube owner-comments when they line up with owners. YouTube and Affiliate blogs are shown for perspective but kept out here — hover the i for why.
What owners like
Excellent value practice amp · 25 · 48%
Huge tone variety via app · 12 · 23%
Fun for jamming and learning songs · 8 · 15%
Simple and easy to use · 6 · 12%
What owners flag
Reliability issues, hiss or cutout · 8 · 15%
Not loud enough to gig · 6 · 12%
Thin, digital sound versus tube amps · 6 · 12%
Needs the app for full benefit · 5 · 10%
Who it's for
A great fit if
Bedroom and at-home practice players
Beginners learning songs and dialing in tones
Players wanting many amp and effect tones cheaply
Guitarists who value app-based practice features
Look elsewhere if
Gigging musicians needing stage volume
Tube-amp purists chasing analog feel
Players wanting a grab-and-go portable amp
Synthesized from what Positive Grid Spark 40 owners say — not a spec sheet.
Retailers' own star averages, for comparison — separate from our vetted owner-verdict score above.
Top quotes, sourced
239 reviewed · 113 shown
Sentiment
Community
Sort
YouTube▼ don’t recommend
“The first built-in practise pattern I tried has got wrong chord positions in the grid - pretty much useless for a beginner, who *depends* on the practise material to be _correct._”
YouTube— neutral
“having many, many options is a bad thing, I'm a beginner and using amp sims was not for me because I wasted more time trying to find a tone/sound I like than practicing”
YouTube▲ recommend
“What I love most about Spark is when I want to learn a song, I search the cloud for the song.”
YouTube▲ recommend
“The best practice amp I have ever owned. Full stop.”
YouTube— neutral
“my only issue is really that there is no dedicated out jack so you can hook into a sound board if you want”
YouTube▼ don’t recommend
“I personally hated the way the spark sounded. I opted for a Spider V 60 Mk2 instead”
Reddit— neutral
“I use it and enjoy it but the sound doesn’t compare to the katana imo”
YouTube▲ recommend
“Turns out...it was worth every penny.”
Reddit▼ don’t recommend
“the EQ doesn't work, and the system can't use gain loud without a loud hissy fit, rendering useless for many purposes”
Reddit▼ don’t recommend
“The Spark 40 isn’t bad by any means but I think the THR is a better and simpler (in a good way) package”
Squier-Talk Forum— neutral
“Love mine, but it sits unused right now.”
YouTube▲ recommend
“This little amp is just amazing,”
Reddit▼ don’t recommend
“I wouldn't recommend a positive grid product to someone who wants to learn to play the guitar”
YouTube▲ recommend
“Got the Spark 40 when they first came out. Absolutely love it!”
YouTube▲ recommend
“I'm a bedroom player and this is the only amp I'll ever need.”
Reddit▼ don’t recommend
“The spark 40 I have does not like hot or high output pickups or pickups close to the strings”
YouTube▲ recommend
“I have one, it is legit fantastic. The tone out of that little amp is unreal.”
Reddit▼ don’t recommend
“I hate that the Spark isn't portable, muffled, and the auto chords are wrong half the time”
Squier-Talk Forum▼ don’t recommend
“It's been a little more than a year and I don't use it anymore, just a gizmo to me”
YouTube▲ recommend
“This makes learning all the pedals and the amps much faster.”
Reddit▼ don’t recommend
“the mustang will likely give you what you describe better than the Spark”
YouTube▲ recommend
“A brilliant bedroom gig amp. Blue tooth can be a bit glitch prone at times but gets there eventually.”
Reddit▼ don’t recommend
“PG flat out stinks when it comes to anything going wrong with their amps”
YouTube▲ recommend
“These are some of the best guitar tones I've heard on their shows.”
Practical notes owners raise — setup, quirks, and issues to watch for. They don't say whether the person likes the product, so they're not counted in the score, but they inform the pros, cons, and who it's for.
