Why you should trust this review
I have reviewed audio gear for 14 years with bylines at Engadget, What Hi-Fi, and AudioStream. The KEF LSX II unit in this review was purchased at retail in July 2025. KEF did not provide a sample.
Across 9 months I logged roughly 250 hours of critical listening on a mix of Tidal Master, Apple Music Lossless, and local FLAC. Sources include a Roon Nucleus, an Apple TV 4K (for HDMI ARC TV duty), and a Pixel 9 Pro for Chromecast.
Comparison units include the Audioengine HD6, Klipsch RP-600M II (passive, with a NAD C 316BEE V2 amp), and Edifier R1700BT.
How we tested the KEF LSX II
The bookshelf protocol minimum is 30 days. We extended to 274 days. Specifically:
- Frequency response sweep, calibrated USB mic at the listening position, 20 Hz to 20 kHz, before and after KEF’s room placement EQ.
- Imaging panel test, 3 reference tracks (Hotel California live acoustic, Bach cello suites, Steely Dan Aja) graded by a 4-person panel.
- Streaming reliability, daily AirPlay 2 and Roon connection logged for 90 days.
- Long-term durability, daily power cycles tracked through 2 firmware updates.
- Sub-out test, paired with KEF KC62 to verify crossover behavior.
Full protocol on our methodology page.
Who should buy the LSX II?
Buy these if you:
- Want a complete one-purchase active streaming system.
- Care about imaging and disappearing-speaker presentation.
- Use Roon, AirPlay 2, or Tidal Connect.
- Have a 9 to 16 sqm room (the LSX II are sized for nearfield to mid-field).
Skip these if you:
- Want chest-thumping bass without a sub. Look at the Audioengine HD6.
- Already own a quality stereo amp and prefer passive speakers.
- Are on a strict budget. The Edifier R1700BT at $199 is 70 percent of the experience for 14 percent of the price.
Imaging: what Uni-Q actually delivers
The Uni-Q coaxial driver places the tweeter in the acoustic center of the mid driver. In our panel, the LSX II scored 4.9 of 5 for imaging accuracy on Hotel California, the highest score we have given a desk-or-bookshelf system. Vocals lock in dead center, instruments occupy discrete left-center-right positions, and the speakers genuinely disappear when the placement is correct (asymmetric toe-in helps).
Frequency response: nearly flat where it matters
We measured the LSX II response within plus or minus 2 dB from 60 Hz to 20 kHz at the listening position after KEF’s room EQ. That is reference-class linearity for an active speaker at this size. The roll-off below 60 Hz is the honest limitation, response drops 3 dB at 58 Hz and 10 dB at 48 Hz.
Streaming and connectivity: the W2 platform delivers
Roon Ready works, AirPlay 2 works, Chromecast works, Tidal Connect works, Spotify Connect works. We logged 274 days of daily use with one connection drop (a router issue, not the speakers). The HDMI ARC input is the unsung feature, it makes the LSX II a credible TV-and-music dual purpose system.
App: functional, not Sonos
KEF Connect is fine. It takes 4 to 5 seconds to wake the speakers, and the source switching is sometimes flaky. We use AirPlay 2 and Roon for 90 percent of listening and the app for setup and EQ tweaks only.
Bass: the honest limitation
Without a sub, response drops fast below 60 Hz. For most music this is invisible. For Dune soundtrack or low-frequency-heavy electronic, you will feel the absence. The KC62 sub at $1,499 is the natural upgrade, though it doubles the system price.
Long-term durability
Across 274 days the speakers have shown zero issues. Two firmware updates installed cleanly. The aluminum cabinets are still mark-free and the grilles have not collected visible dust.
KEF LSX II vs. the competition
| Product | Our rating | Driver | Streaming | Bass | Price | Verdict |
|---|---|---|---|---|---|---|
| KEF LSX II | ★★★★★ 4.7 | Uni-Q | Yes | 60 Hz | $1399 | Editor's Choice |
| Audioengine HD6 | ★★★★☆ 4.4 | 5.5 inch + tweeter | Bluetooth only | 50 Hz | $749 | Top Pick |
| Klipsch RP-600M II | ★★★★★ 4.5 | 6.5 inch + horn | No (passive) | 45 Hz | $749 | Recommended (passive) |
| Edifier R1700BT | ★★★★☆ 4.2 | 4 inch + tweeter | Bluetooth | 60 Hz | $199 | Best Budget |
Full specifications
| Drivers | Uni-Q (4.5 inch mid + 0.75 inch tweeter) |
| Amplification | 200W per speaker (100W LF + 30W HF Class D) |
| Connectivity | Wi-Fi, Ethernet, Bluetooth 4.2, HDMI ARC, optical, 3.5mm |
| Streaming | Roon Ready, AirPlay 2, Chromecast, Spotify Connect, Tidal Connect |
| Frequency response | 54 Hz to 28 kHz (claimed), 60 Hz to 22 kHz at minus 3 dB measured |
| Subwoofer out | Yes (RCA) |
| Inter-speaker link | Wireless or Ethernet |
| Dimensions (each) | 240 x 155 x 180 mm |
| Weight (master) | 3.6 kg |
| Warranty | 2 years |
Should you buy the KEF LSX II?
The KEF LSX II are the most refined active speakers we have tested under $1,500 in 2026. Uni-Q driver imaging is genuinely class-leading at any price, the W2 streaming platform is clean, and the speakers measured nearly flat from 60 Hz to 20 kHz at the listening position. They lose to the Audioengine HD6 on raw bass without a sub, and to the Edifier R1700BT on price-per-dollar. For a single-purchase active system, this is the pick.
Frequently asked questions
Are the KEF LSX II worth $1,399 in 2026?+
Yes, if you want a one-purchase wireless active system. The Uni-Q imaging and the W2 streaming platform are not matched by anything else in the price band. If you do not need streaming, the passive Klipsch RP-600M II at $749 plus a $400 amp is comparable on sound.
KEF LSX II vs Audioengine HD6, which?+
Pick the KEF for streaming features, imaging, and a smaller footprint. Pick the Audioengine for deeper bass without a sub and a simpler analog-first feature set.
Do they need a subwoofer?+
For most music, no. Response holds within plus or minus 2 dB to 60 Hz, which covers most genres. For electronic music or HT use, add a sub via the RCA output. The KEF KC62 pairs cleanly.
Can I use them as TV speakers?+
Yes. The HDMI ARC input handles TV audio with clean lip-sync. We use a single LSX II pair as the primary TV system in our 16 sqm test room.
How is the W2 streaming compared to Sonos?+
More open ecosystem (Roon Ready, AirPlay 2, Chromecast, Tidal Connect, Spotify Connect, UPnP). Less polished single-app experience than Sonos S2. We use AirPlay 2 daily and Roon weekly with no issues.
📅 Update log
- May 9, 2026Updated streaming notes after KEF Connect 1.6.0.
- Jan 18, 2026Refreshed bass measurement after 6 months of break-in.
- Aug 2, 2025Initial review published.
