Short answer: the ELAC BS U5 for better sound quality, the KEF Q100 for the lower price. The ELAC BS U5 ranks #29 of 56 bookshelf speakers at $856. The KEF Q100 ranks #38 at $550, $306 cheaper.
What the ELAC BS U5 gets right: This slim three-way coaxial design (an Andrew Jones creation) shows a fairly even on-axis response up to 3kHz, with off-axis behavior notably smoother than the on-axis curve. The catch: Distortion is very high right at both crossover points - around 270Hz (mid-range) and 2700Hz (tweeter) - at both 86dB and 96dB SPL/1m, exceeding 3% at the mid-range crossover.
What the KEF Q100 offers: 5.25” Uni-Q coaxial driver keeps the tweeter and woofer point-source aligned for consistent imaging. Watch for: CEA2034 spinorama shows broad, audible deviations from flat rather than narrow peaks: a lift from 700Hz-1.5kHz and again from 5kHz up, plus a cancellation notch around 1.4kHz from port/cabinet interaction.
Buy the ELAC BS U5 if sound quality matters more than the price. Buy the KEF Q100 if the price matters more than sound quality.
Specifications Side By Side
| ELAC BS U5 | KEF Q100 | |
|---|---|---|
| Price | $856 Discontinued | $550 Discontinued |
| Ranked | #29 of 56 in Medium Size Bookshelf Speakers | #38 of 56 in Medium Size Bookshelf Speakers |
| Bass Extension (-3dB) | 78Hz (measured, Audio Science Review) | 85Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | 60Hz (measured, Audio Science Review) | 65Hz (measured, Audio Science Review) |
| Drivers | 1" tweeter + 5.25" woofer | 5.25" Uni-Q aluminum coaxial driver, 1" aluminum dome tweeter |
| Discontinued | Yes | Yes |
| Weight | 13.2 lbs / 6 kg | 13 lbs / 5.9 kg each |
| Sensitivity | 83dB (2.83V/1m, measured, Audio Science Review) | 85dB (2.83V/1m, measured, Audio Science Review) |
| Impedance | 4 ohms nominal (3.4 ohms minimum) | 8 ohms nominal |
| Dimensions | 13.4"H x 7"W x 11.5"D (339.1 x 178.0 x 293.1 mm) | 11.8"H x 7.1"W x 10.7"D (300 x 180 x 272 mm) |
| Woofer Cabinet | ported, rear | ported, rear |
| Frequency Response | - | 49Hz - 40kHz (+/-3dB) (Manufacturer specified) |
Related Speaker Comparisons
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- Dynaudio Emit M10 vs ELAC Uni-Fi 2.0 UB52
- JBL L52 Classic vs Q Acoustics 3020i
- Wharfedale Diamond 12.1 vs ELAC BS U5
- ELAC BS U5 vs ELAC Uni-Fi 2.0 UB52
The Two Speakers In Full
ELAC BS U5: $856 Discontinued
Pros: This slim three-way coaxial design (an Andrew Jones creation) shows a fairly even on-axis response up to 3kHz, with off-axis behavior notably smoother than the on-axis curve. Predicted in-room response looks like it should give good tonality. Vertical directivity is better than average, a benefit of the coaxial layout.
Cons: Distortion is very high right at both crossover points - around 270Hz (mid-range) and 2700Hz (tweeter) - at both 86dB and 96dB SPL/1m, exceeding 3% at the mid-range crossover. Minimum impedance dips to 3.4 ohms with a possible resonance around 500Hz visible in the impedance/phase curve. Discontinued.
Full ELAC BS U5 review and specifications →
| Bass Extension (-10dB) | 60Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 78Hz (measured, Audio Science Review) |
| Dimensions | 13.4"H x 7"W x 11.5"D (339.1 x 178.0 x 293.1 mm) |
| Discontinued | Yes |
| Drivers | 1" tweeter + 5.25" woofer |
| Impedance | 4 ohms nominal (3.4 ohms minimum) |
| Sensitivity | 83dB (2.83V/1m, measured, Audio Science Review) |
| Weight | 13.2 lbs / 6 kg |
| Woofer Cabinet | ported, rear |
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- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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- ELAC BS U5 vs Dynaudio Emit M10
- ELAC BS U5 vs Acoustic Energy AE100 Mk2
- ELAC BS U5 vs Dynaudio X14
- ELAC BS U5 vs Paradigm Monitor SE Atom
- ELAC BS U5 vs Sony SS-CS5 M2
- ELAC BS U5 vs Pioneer SP-BS22-LR (Philharmonic AAM Mod)
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KEF Q100: $550 Discontinued
Pros: 5.25” Uni-Q coaxial driver keeps the tweeter and woofer point-source aligned for consistent imaging. 86dB sensitivity is reasonably easy to drive.
Cons: CEA2034 spinorama shows broad, audible deviations from flat rather than narrow peaks: a lift from 700Hz-1.5kHz and again from 5kHz up, plus a cancellation notch around 1.4kHz from port/cabinet interaction. Bass sensitivity drops to about 80dB and impedance falls below 4 ohms in the bass, demanding a capable amplifier. The reviewer heard boomy, buzzing bass that improved somewhat with the port plugged, and could not recommend it, calling the famous reputation more about looks than sound. Discontinued.
Full KEF Q100 review and specifications →
| Bass Extension (-10dB) | 65Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 85Hz (measured, Audio Science Review) |
| Dimensions | 11.8"H x 7.1"W x 10.7"D (300 x 180 x 272 mm) |
| Discontinued | Yes |
| Drivers | 5.25" Uni-Q aluminum coaxial driver, 1" aluminum dome tweeter |
| Frequency Response | 49Hz - 40kHz (+/-3dB) (Manufacturer specified) |
| Impedance | 8 ohms nominal |
| Sensitivity | 85dB (2.83V/1m, measured, Audio Science Review) |
| Weight | 13 lbs / 5.9 kg each |
| Woofer Cabinet | ported, rear |
As an eBay Partner, we may be compensated if you make a purchase.
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons