Guitar amps · owner-verdict comparison

Boss Katana-50 MkII vs Positive Grid Spark 40: what real owners say

Real owners lean toward the Boss Katana-50 MkII: 86% of 115 owners recommend it, vs 54% of 52 for the Positive Grid Spark 40.

Verdicts aggregated from Reddit, enthusiast forums, and YouTube owner comments — affiliate reviews excluded. Sample sizes differ; judge accordingly. How we score

Boss Katana-50 MkII

86%of 115 owners recommend
86% recommend · 6% neutral · 8% don't
Owners praise
  • Sounds fantastic with versatile, quality amp tones and effects
  • Incredible value for how cheap it is
  • Highly customizable via the Tone Studio software
Full owner report →

Positive Grid Spark 40

54%of 52 owners recommend
54% recommend · 4% neutral · 42% don't
Owners praise
  • Excellent value practice amp
  • Huge tone variety via app
  • Fun for jamming and learning songs
Owners complain about
  • Reliability issues, hiss or cutout
  • Not loud enough to gig
  • Thin, digital sound versus tube amps
Full owner report →

What Boss Katana-50 MkII owners say

“Boss nailed it with this amp.”
— @Esk8Tech on YouTube
“Really my best purchase ever”
— @088Noir on YouTube
“On the Katana, the 'lead' channel is too fizzy.”
— @valueofnothing2487 on YouTube

What Positive Grid Spark 40 owners say

“What I love most about Spark is when I want to learn a song, I search the cloud for the song.”
— @jrigwald on YouTube
“The best practice amp I have ever owned. Full stop.”
— @l-Libertine on YouTube
“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._”
— @Noone-of-your-Business on YouTube