Short answer: the KEF Q100 for imaging, the Polk T15 for a very low price, though neither ranks well in its class. The Polk measured better at +/-20 degrees vertical off-axis than on-axis, but spinorama analysis reveals a “horrific drop in upper mids/lower treble region of 3 to 6 kHz,” likely tweeter-woofer phase cancellation. The Q100’s Uni-Q keeps its drivers aligned, though its spinorama shows a 700Hz-1.5kHz lift and a cancellation notch around 1.4kHz. Both are rated below 3.0/5 among the 90 bookshelf speakers, so if sound quality matters, consider the Ascend Acoustics HTM-200SE2 instead, ranked #7 at $368.
Buy the Polk T15 new; the KEF Q100 is no longer sold new, so it only makes sense as a used find.
Still deciding? The full Passive Home rankings cover every ranked option.
Specifications Side By Side
| KEF Q100 | Polk T15 | |
|---|---|---|
| Price | $550 per pair Discontinued | $149.00 per pair |
| Ranked | #71 of 90 in Medium Size Bookshelf Speakers | #81 of 90 in Medium Size Bookshelf Speakers |
| Bass Extension (-3dB) | 85Hz (measured, Audio Science Review) | 88.6Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | 65Hz (measured, Audio Science Review) | 58.1Hz (measured, Audio Science Review) |
| Sensitivity | 85dB (2.83V/1m, measured, Audio Science Review) | 89dB (manufacturer specified, 1W/1m); 88.98dB measured, spinorama.org |
| Impedance | 8 ohms nominal | 8 ohms nominal |
| Frequency Response | 49Hz - 40kHz (+/-3dB) (Manufacturer specified) | 60Hz - 24kHz (Manufacturer specified) |
| Drivers | 5.25” Uni-Q aluminum coaxial driver, 1” aluminum dome tweeter | 0.75” tweeter, 5.25” woofer |
| Weight | 13 lbs (5.9 kg) each | 8.2 lbs (3.74 kg) each |
| Dimensions | 11.8”H x 7.1”W x 10.7”D (300 x 180 x 272 mm) | 10.63H x 6.5W x 7.25D in |
| Woofer Cabinet | ported, rear | - |
| Spinorama Preference Score | 4.96 (spinorama.org) | 0.34 |
| Spinorama Preference Score with Perfect Sub | 7.24 (spinorama.org) | 3.39 |
| DIY Kit | No | No |
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Prices on this page were last checked October 2, 2026 at 10:18 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
KEF Q100: $550 per pair Discontinued eBay
Newer model: the KEF Q1 Meta, ranked higher, rated 3.6/5.
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. Measured bass extension of 85Hz (-3dB), with a measured sensitivity of 85dB.
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) |
| DIY Kit | No |
| Dimensions | 11.8”H x 7.1”W x 10.7”D (300 x 180 x 272 mm) |
| 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) |
| Spinorama Preference Score | 4.96 (spinorama.org) |
| Spinorama Preference Score with Perfect Sub | 7.24 (spinorama.org) |
| Weight | 13 lbs (5.9 kg) each |
| Woofer Cabinet | ported, rear |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Polk T15: $149.00 per pair Amazon eBay
Pros: Extremely affordable 2-way design that actually measured better at +/-20 degrees vertical off-axis than directly on-axis. In near-field desktop use, the reviewer found the T15 “didn’t sound that horrible,” partly because nearby desk reflections mask the frequency response dip. Measured bass extension of 88.6Hz (-3dB), with a measured sensitivity of 89dB.
Cons: Spinorama analysis reveals what Amir called a “horrific drop in upper mids/lower treble region of 3 to 6 kHz,” likely from tweeter-woofer phase cancellation directly on-axis. Measured impedance ranges from 4-8 ohms, contradicting the specified 6-8 ohm range, and there’s a distortion peak around 400Hz. On- and off-axis response “vary a ton,” making listening position unusually important. The reviewer recommends saving up for the Pioneer SP-BS22-LR instead: “I can’t justify recommending the Polk T15 even though subjective performance was not horrible.”
Full Polk T15 review and specifications →
| Bass Extension (-10dB) | 58.1Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 88.6Hz (measured, Audio Science Review) |
| DIY Kit | No |
| Dimensions | 10.63H x 6.5W x 7.25D in |
| Drivers | 0.75” tweeter, 5.25” woofer |
| Frequency Response | 60Hz - 24kHz (Manufacturer specified) |
| Impedance | 8 ohms nominal |
| Sensitivity | 89dB (manufacturer specified, 1W/1m); 88.98dB measured, spinorama.org |
| Spinorama Preference Score | 0.34 |
| Spinorama Preference Score with Perfect Sub | 3.39 |
| Weight | 8.2 lbs (3.74 kg) each |
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- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons