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KEF LSX II · Black — Smart/Portable · $1399
KEF

KEF LSX II · Black

Smart/Portable · $1399

92
/ 100
From $1,399
VS
KEF LSX II · Black wins by 6
JBL Xtreme 3 — Smart/Portable · $299
JBL

JBL Xtreme 3

Smart/Portable · $299

86
/ 100
From $299
Specdex verdict

KEF LSX II · Black takes it — here’s why.

In our weighted Specdex score, KEF LSX II · Black lands at 92 and JBL Xtreme 3 at 86. That puts KEF LSX II · Black ahead by 6 points — a decisive margin driven mostly by its strengths in the categories below.

Pick KEF LSX II · Black if…

  • ✓Easy multi-room with ecosystem
  • ✓App EQ on modern models
  • ✓USB-C/AUX input on some

Pick JBL Xtreme 3 if…

  • ✓Easy multi-room with ecosystem
  • ✓App EQ on modern models
  • ✓USB-C/AUX input on some
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Winner by scenario

Derived from the sub-score breakdown · not a separate test

Sound

KEF LSX II · Black

Compared on the sound sub-score

KEF LSX II · Black leads on sound (92 vs 86).

Design

Tie

Compared on the design sub-score

Effectively tied — neither pulls a 2-point weighted lead.

Features

KEF LSX II · Black

Compared on the features sub-score

KEF LSX II · Black leads on features (90 vs 84).

Value for money

JBL Xtreme 3

Specdex score per dollar at MSRP

JBL Xtreme 3 more score per dollar ($299 vs $1,399).

KEF LSX II · Black 92
vs
86 JBL Xtreme 3

Score breakdown

KEF LSX II · Black
92
sound 92
features 90
design 88
ecosystem 84
JBL Xtreme 3
86
sound 86
features 84
design 88
ecosystem 84

Specs side-by-side

KEF LSX II · Black versus JBL Xtreme 3 — full spec comparison
Spec KEF LSX II · Black JBL Xtreme 3

KEF LSX II · Black

Pros
  • +Easy multi-room with ecosystem
  • +App EQ on modern models
  • +USB-C/AUX input on some
Cons
  • −Brand ecosystem lock-in
  • −Subscription features on some
  • −Bass limits at lower sizes

JBL Xtreme 3

Pros
  • +Easy multi-room with ecosystem
  • +App EQ on modern models
  • +USB-C/AUX input on some
Cons
  • −Brand ecosystem lock-in
  • −Subscription features on some
  • −Bass limits at lower sizes

FAQ: KEF LSX II · Black vs JBL Xtreme 3

Which is better, KEF LSX II · Black or JBL Xtreme 3? +

KEF LSX II · Black scores 92 on our weighted rubric — ahead by 6. Your best pick depends on the sub-scores above.

Is KEF LSX II · Black worth the price? +

At $1,399, KEF LSX II · Black delivers a Specdex score of 92 — strongest in sound.

Is JBL Xtreme 3 worth the price? +

At $299, JBL Xtreme 3 delivers a Specdex score of 86 — strongest in design.

Does KEF LSX II · Black or JBL Xtreme 3 last longer? +

Based on our long-term update and support ratings, both ship with multi-year support. Battery and reliability scores are visible in the breakdown above.

Which is better for sound, KEF LSX II · Black or JBL Xtreme 3? +

KEF LSX II · Black — leads on sound (92 vs 86). Compared on the sound sub-score.

Which is better for features, KEF LSX II · Black or JBL Xtreme 3? +

KEF LSX II · Black — leads on features (90 vs 84). Compared on the features sub-score.