PSI Audio A21-M vs KEF LS LUXE

Short answer: the PSI Audio A21-M if sound quality matters most, the KEF LS LUXE if price matters most. The PSI Audio A21-M ranks #27 of 118 powered bookshelf speakers, rated 4.5/5, at $7,770. The KEF LS LUXE ranks #42, rated 4.4/5, at $3,999.99, $3,770.01 cheaper.

What the PSI Audio A21-M does well: ASR measured 39.6Hz -3dB extension and a 2.2dB response span from 300Hz to 5kHz, giving useful bass and broadly even mids. Watch for: The measured tonal result is good rather than a clear advance over less costly competitors.

The case for the KEF LS LUXE: Flagship active wireless bookshelf created with Ross Lovegrove, featuring a 6.5-inch 12th-generation Uni-Q driver array with Metamaterial Absorption Technology (MAT). It keeps a wired aux input, which the PSI Audio A21-M lacks. The catch: Premium $3,999.99 pricing and a sculptural 44.1 lbs (20 kg) system weight place it well above conventional desktop monitors, and the organic curved enclosure cannot be wall mounted.

Buy the PSI Audio A21-M when sound quality outweighs the price for you, and the KEF LS LUXE when the price outweighs sound quality instead.

Worth knowing: the KEF LS LUXE has not been measured yet. Its rating is estimated from related models, with a likely range of 4.2 to 4.6, so treat this verdict as provisional.

Looking for alternatives? See the complete Powered Home rankings.

Specifications Side By Side

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Prices on this page were last checked October 11, 2026 at 4:59 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.

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The Two Speakers In Full

PSI Audio A21-M: $7,770 per pair B&H Photo Video eBay

Pros: ASR measured 39.6Hz -3dB extension and a 2.2dB response span from 300Hz to 5kHz, giving useful bass and broadly even mids. Its 7.72 ideal-subwoofer score supports serious monitoring, with analog phase compensation offering an alternative to DSP-based systems. Measured bass extension of 39.6Hz (-3dB).

Cons: The measured tonal result is good rather than a clear advance over less costly competitors. There is no built-in automatic room-calibration system, so placement or external correction still matters. The premium construction and analog circuitry should not be mistaken for proof of better audible performance.

Full PSI Audio A21-M review and specifications →

AES Input	No
Amplifier Power	335W total (280W woofer, 55W tweeter, Class A/B)
Aux Input	No
Bass Extension (-10dB)	33.2Hz (measured, Audio Science Review)
Bass Extension (-3dB)	39.6Hz (measured, Audio Science Review)
Bluetooth	No
Coaxial Input	No
Country	Switzerland
Crossover Frequency	2.4kHz
Dimensions	15.7”H x 9.8”W x 11.8”D (400 x 250 x 300 mm)
Drivers	27mm handmade dome tweeter, 172mm cone woofer
Enclosure	ported
Frequency Response	38Hz-23kHz -6dB
HDMI Input	No
Inputs	XLR (balanced analog)
Maximum SPL	110dB short term, 121dB peak (manufacturer specified)
Optical Input	No
RCA Input	No
Spinorama Preference Score	6.07
Spinorama Preference Score with Perfect Sub	7.72
TRS Input	No
USB Input	No
Warranty	5+1 years
Weight	28.2 lbs (12.8 kg) each
XLR Input	Yes

• Links
  • PSI Audio A21-M Official Page
• Reviews, Comparisons and Sound Samples
  • Audio Science Review: PSI A21-M Monitor Review More from Audio Science Review →
  • Audio Science Review Measurements (spinorama.org)
• Head-to-Head Comparisons
  • PSI Audio A21-M vs Kii Seven
  • PSI Audio A21-M vs ADAM Audio S3V
  • PSI Audio A21-M vs ADAM Audio S3H
  • PSI Audio A21-M vs Yamaha HS8
  • PSI Audio A21-M vs Kali Audio LP-6 V2
  • PSI Audio A21-M vs Devialet Phantom Ultimate 108dB
  • PSI Audio A21-M vs Focal Solo6 ST6
  • PSI Audio A21-M vs Meyer Sound Amie
  • See all 9 comparisons

KEF LS LUXE: $3,999.99 per pair Estimated Amazon KEF eBay

Pros: Flagship active wireless bookshelf created with Ross Lovegrove, featuring a 6.5-inch 12th-generation Uni-Q driver array with Metamaterial Absorption Technology (MAT). Bi-amplified with Class D on the woofer and Class AB on the 1-inch vented aluminum dome tweeter. Features KEF Velocity Control Technology (VECO), current-drive amplification, dual-band Wi-Fi (AirPlay 2, Chromecast, Roon Ready), Bluetooth 5.3, HDMI eARC, optical, coaxial, 3.5mm aux, and twin subwoofer outputs with high-pass filtering.

Cons: Premium $3,999.99 pricing and a sculptural 20 kg system weight place it well above conventional desktop monitors, and the organic curved enclosure cannot be wall mounted.

Full KEF LS LUXE review and specifications →

Amplifier Power	380W (280W LF + 100W HF)
Aux Input	Yes
Bluetooth	Yes
Bluetooth Version	5.3
Cabinet Color	Dusk Titanium, Eclipse Black, Mineral White
Coaxial Input	Yes
Country	United Kingdom
Dimensions	13.2”H x 8.8”W x 11.7”D (336 x 223 x 298 mm)
Drivers	1” vented aluminum dome with MAT tweeter, 6.5” aluminum cone woofer
Enclosure	ported
Ethernet	Yes
Frequency Response	42Hz - 28kHz (±3dB) (manufacturer specified)
HDMI Input	Yes
Optical Input	Yes
Stereo	pair
Subwoofer Output	Yes
Weight	44.1 lbs (20.0 kg)
Wi-Fi	Yes

• Links
  • Official KEF LS LUXE Website
• Reviews, Comparisons and Sound Samples
  • No independent measurement review is linked for this model; it is ranked from hands-on listening and comparison against similarly priced speakers.
• Head-to-Head Comparisons
  • KEF LS LUXE vs Devialet Phantom Ultimate 108dB
  • KEF LS LUXE vs ADAM Audio S3H
  • KEF LS LUXE vs Devialet Phantom I