Short answer: the KEF Q100 for better sound quality, the Polk T15 for the lower price. The KEF Q100 ranks #38 of 56 bookshelf speakers at $550. The Polk T15 ranks #47 at $149, $401 cheaper.
The case for the KEF Q100: 5.25” Uni-Q coaxial driver keeps the tweeter and woofer point-source aligned for consistent imaging. The tradeoff: 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.
What the Polk T15 gets right: Extremely affordable 2-way design that actually measured better at +/-20 degrees vertical off-axis than directly on-axis. The catch: 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.
Buy the KEF Q100 if sound quality matters more than the price. Buy the Polk T15 if the price matters more than sound quality.
If sound quality matters at all to you, skip the Polk T15. It ranks near the bottom of the 56 bookshelf speakers, so look higher up the list instead.
Specifications Side By Side
| KEF Q100 | Polk T15 | |
|---|---|---|
| Price | $550 Discontinued | $149.00 |
| Ranked | #38 of 56 in Medium Size Bookshelf Speakers | #47 of 56 in Medium Size Bookshelf Speakers |
| Bass Extension (-3dB) | 85Hz (measured, Audio Science Review) | - |
| Bass Extension (-10dB) | 65Hz (measured, Audio Science Review) | - |
| Discontinued | Yes | - |
| Sensitivity | 85dB (2.83V/1m, measured, Audio Science Review) | - |
| 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 | - |
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The Two Speakers In Full
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 |
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Polk T15: $149.00 Amazon
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.
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 →
| 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 |
| Weight | 8.2 lbs / 3.74 kg each |
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