Short answer: the KEF LSX II LT for better sound quality, the Avantone Pro Active MixCube for the lower price. The KEF LSX II LT ranks #27 of 64 powered bookshelf speakers at $469.99. The Avantone Pro Active MixCube ranks #59 at $259, $210.99 cheaper.
What the KEF LSX II LT offers: Coaxial (Uni-Q-style) driver keeps the tweeter centered in the midrange, giving wide and consistent dispersion both horizontally and vertically (about ±60° each) - a wide sweet spot for multiple seats or positions. The KEF Connect app provides genuinely useful DSP control: desk/wall boundary compensation, adjustable bass contour (standard/less/extra), treble trim, and subwoofer integration, letting you tune the sound to wherever it’s placed. Distortion at a moderate 86dB looks good for the speaker’s compact size. Tonal profile stays consistent from 0° to 30° off-axis, so side-seat listeners hear essentially the same balance as someone centered. Extensive connectivity for its size: HDMI, USB, optical, sub output, plus Wi-Fi/Bluetooth. Clearly outperformed the reviewer’s soundbars, including ones bundled with their own subwoofers, as a TV audio replacement. Watch for: Small drivers mean it’s SPL-limited: bass compression kicks in around 88-92dB/1m per speaker, and multitone distortion crosses the reviewer’s 3% threshold around 96dB - not intended for loud or large-room duty. F3 of 55Hz and F10 of 46Hz mean it loses much of its bass by around 50Hz; a subwoofer (controllable through the same app) is needed for real low end. Diffraction dips appear around 4-5kHz and again near 8kHz, likely tied to the tweeter housing or surround, giving a mild reduction in treble attack and sibilance. A possible port or enclosure resonance shows up around 800Hz in the rear-radiation measurements, though the reviewer wasn’t certain of the exact cause or whether it’s audible. No analog input on this LT variant, so a turntable can’t be connected directly - only the pricier standard LSX II model includes one.
What the Avantone Pro Active MixCube offers: A compact sealed single-driver monitor made specifically for checking midrange balance and mix translation. Its 60W Class-AB amplifier, balanced combo input, isolation pad and mic-stand mount make it a convenient specialist studio tool. Watch for: The local Spinorama results are exceptionally limited for general listening: -3.74 raw and only 1.00 with a subwoofer, with 183Hz measured extension. It omits deep bass and treble by design, so this ranking reflects objective full-range performance rather than its utility as a secondary mix check.
Buy the KEF LSX II LT if sound quality matters more than the price. Buy the Avantone Pro Active MixCube if the price matters more than sound quality.
If sound quality matters at all to you, skip the Avantone Pro Active MixCube. It ranks near the bottom of the 64 powered bookshelf speakers, so look higher up the list instead.
Specifications Side By Side
| KEF LSX II LT | Avantone Pro Active MixCube | |
|---|---|---|
| Price | $469.99 | $259 each |
| Ranked | #27 of 64 in Medium Size Powered Bookshelf Speakers | #59 of 64 in Medium Size Powered Bookshelf Speakers |
| Dimensions | 9.5"H x 6.1"W x 7.1"D (241.3 x 154.9 x 180.3 mm) | 6.5H x 6.5W x 6.5D in |
| Inputs | Wifi, USB-C, HDMI, Optical, Bluetooth | Balanced XLR/TRS combo |
| Outputs | RCA Subwoofer | - |
| Drivers | 115mm (4.5in.) magnesium/aluminium alloy cone woofer, 19mm (0.75in.) aluminium dome tweeter | - |
| Weight | 15 lbs / 6.8 kg | 7.13 lbs each |
| App | No | - |
| Bluetooth | No | - |
| EQ | No | - |
| Output Power | 100w RMS Per Speaker | - |
| Bass Extension (-3dB) | 55Hz (measured, Erin’s Audio Corner) | - |
| Bass Extension (-10dB) | 46Hz (measured, Erin’s Audio Corner) | - |
| Sensitivity | 84dB (measured at 0.3V/1m, Erin’s Audio Corner) | - |
| Enclosure | - | Powered sealed full-range monitor |
| Driver | - | 5.25-inch paper cone |
| Amplifier | - | 60W RMS Class AB |
| Frequency Response | - | 90Hz-17kHz |
| Maximum SPL | - | 104dB at 1m |
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Prices on this page were last checked August 25, 2026 at 6:19 AM 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
KEF LSX II LT: $469.99 Amazon eBay
Pros: Coaxial (Uni-Q-style) driver keeps the tweeter centered in the midrange, giving wide and consistent dispersion both horizontally and vertically (about ±60° each) - a wide sweet spot for multiple seats or positions. The KEF Connect app provides genuinely useful DSP control: desk/wall boundary compensation, adjustable bass contour (standard/less/extra), treble trim, and subwoofer integration, letting you tune the sound to wherever it’s placed. Distortion at a moderate 86dB looks good for the speaker’s compact size. Tonal profile stays consistent from 0° to 30° off-axis, so side-seat listeners hear essentially the same balance as someone centered. Extensive connectivity for its size: HDMI, USB, optical, sub output, plus Wi-Fi/Bluetooth. Clearly outperformed the reviewer’s soundbars, including ones bundled with their own subwoofers, as a TV audio replacement.
Cons: Small drivers mean it’s SPL-limited: bass compression kicks in around 88-92dB/1m per speaker, and multitone distortion crosses the reviewer’s 3% threshold around 96dB - not intended for loud or large-room duty. F3 of 55Hz and F10 of 46Hz mean it loses much of its bass by around 50Hz; a subwoofer (controllable through the same app) is needed for real low end. Diffraction dips appear around 4-5kHz and again near 8kHz, likely tied to the tweeter housing or surround, giving a mild reduction in treble attack and sibilance. A possible port or enclosure resonance shows up around 800Hz in the rear-radiation measurements, though the reviewer wasn’t certain of the exact cause or whether it’s audible. No analog input on this LT variant, so a turntable can’t be connected directly - only the pricier standard LSX II model includes one.
Full KEF LSX II LT review and specifications →
| App | No |
|---|---|
| Bass Extension (-10dB) | 46Hz (measured, Erin's Audio Corner) |
| Bass Extension (-3dB) | 55Hz (measured, Erin's Audio Corner) |
| Bluetooth | No |
| Dimensions | 9.5"H x 6.1"W x 7.1"D (241.3 x 154.9 x 180.3 mm) |
| Drivers | 115mm (4.5in.) magnesium/aluminium alloy cone woofer, 19mm (0.75in.) aluminium dome tweeter |
| EQ | No |
| Inputs | Wifi, USB-C, HDMI, Optical, Bluetooth |
| Output Power | 100w RMS Per Speaker |
| Outputs | RCA Subwoofer |
| Sensitivity | 84dB (measured at 0.3V/1m, Erin's Audio Corner) |
| Weight | 15 lbs / 6.8 kg |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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Avantone Pro Active MixCube: $259 each B&H Photo Video eBay
Pros: A compact sealed single-driver monitor made specifically for checking midrange balance and mix translation. Its 60W Class-AB amplifier, balanced combo input, isolation pad and mic-stand mount make it a convenient specialist studio tool.
Cons: The local Spinorama results are exceptionally limited for general listening: -3.74 raw and only 1.00 with a subwoofer, with 183Hz measured extension. It omits deep bass and treble by design, so this ranking reflects objective full-range performance rather than its utility as a secondary mix check.
Full Avantone Pro Active MixCube review and specifications →
| Amplifier | 60W RMS Class AB |
|---|---|
| Dimensions | 6.5H x 6.5W x 6.5D in |
| Driver | 5.25-inch paper cone |
| Enclosure | Powered sealed full-range monitor |
| Frequency Response | 90Hz-17kHz |
| Inputs | Balanced XLR/TRS combo |
| Maximum SPL | 104dB at 1m |
| Weight | 7.13 lbs each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Avantone Pro Active MixCube vs Edifier R1280DB
- Avantone Pro Active MixCube vs KRK Classic 5
- Avantone Pro Active MixCube vs Edifier S2000MKIII
- Avantone Pro Active MixCube vs IK Multimedia iLoud MTM MKII
- Avantone Pro Active MixCube vs Yamaha HS5
- Avantone Pro Active MixCube vs Adam Audio T5V
- Avantone Pro Active MixCube vs JBL 305P MKII
- Avantone Pro Active MixCube vs Kali LP-UNF
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