Short answer: the Wharfedale Diamond 12.1 for better sound quality, the Polk Audio XT15 for the lower price. The Wharfedale Diamond 12.1 ranks #19 of 63 bookshelf speakers at $599. The Polk Audio XT15 ranks #26 at $179, $420 cheaper.
What the Wharfedale Diamond 12.1 offers: A budget two-way bookshelf speaker (5” polypropylene woofer, 1” textile dome tweeter) that measures well for its price: harmonic distortion at 86dB stays under 1% THD down to about 60Hz, genuinely good for a 5” mid-woofer. Set against that: A dip of about 3dB in the 1-3kHz crossover region (on-axis, in the predicted in-room response, and even off-axis) gives the speaker a soft, “laid-back” character that noticeably saps attack and transient bite from drums, guitar and other percussive material - possibly an intentional BBC-style dip, but one the reviewer would still prefer tuned flat.
On the Polk Audio XT15 side: Very low $179/pair entry price for a Hi-Res Audio Certified 2-way design that’s Dolby Atmos and DTS:X compatible, and works with either 4- or 8-ohm amplifier outputs so it drops into almost any AVR without matching concerns. The tradeoff: Bass rolls off earlier than most of this batch at 77.6Hz (-3dB) / 54.2Hz (-10dB).
Buy the Wharfedale Diamond 12.1 if sound quality matters more than the price. Buy the Polk Audio XT15 if the price matters more than sound quality.
Specifications Side By Side
| Wharfedale Diamond 12.1 | Polk Audio XT15 | |
|---|---|---|
| Price | $599 Discontinued | $179 |
| Ranked | #19 of 63 in Medium Size Bookshelf Speakers | #26 of 63 in Medium Size Bookshelf Speakers |
| Bass Extension (-10dB) | 46Hz (measured, Erin’s Audio Corner) | 54.2Hz (measured, spinorama.org) |
| Bass Extension (-3dB) | 61Hz (measured, Erin’s Audio Corner) | 77.6Hz (measured, spinorama.org) |
| Crossover Frequency | 2.6kHz | - |
| Dimensions | 12.2"H x 7"W x 10.9"D (310 x 178 x 277 mm) | 16.51 x 18.24cm (6.5 x 7.18 in), 4.08kg (9 lb) each |
| Impedance | 8 ohms nominal (3.9 ohms minimum above 80Hz, measured, Erin’s Audio Corner) | 4/8-ohm compatible |
| Sensitivity | 84dB (measured by Erin’s Audio Corner; 87dB manufacturer specified) | 86dB (1W/1m) |
| Drivers | 5" advanced polypropylene cone woofer, 1" textile dome tweeter | 1" Terylene dome tweeter, 5.25" bi-laminate paper woofer |
| Discontinued | Yes | - |
| Weight | 15 lbs / 6.8 kg each | 9 lbs / 4.08 kg (9 lb) each |
| Woofer Cabinet | ported | Ported |
Related Speaker Comparisons
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- Wharfedale Diamond 220 vs JBL Studio 530
- Klipsch RP-500M II vs Wharfedale Diamond 220
- KEF Q150 vs Wharfedale Diamond 220
- Pioneer SP-BS22-LR (Philharmonic AAM Mod) vs Wharfedale Diamond 12.1
- Carmody S2000 vs Wharfedale Diamond 12.1
The Two Speakers In Full
Wharfedale Diamond 12.1: $599 Discontinued
Pros: A budget two-way bookshelf speaker (5” polypropylene woofer, 1” textile dome tweeter) that measures well for its price: harmonic distortion at 86dB stays under 1% THD down to about 60Hz, genuinely good for a 5” mid-woofer. Wide horizontal radiation of about ±60° up to roughly 5kHz before the tweeter starts to beam. Tonally smooth and easy to listen to at moderate volumes, with a pleasant, non-fatiguing character the reviewer said he’d happily recommend to someone who wants noticeably better fit, finish and looks than typical speakers in the $300-400 range. A high-pass crossover around 80Hz meaningfully cleans up midrange multitone distortion, so pairing it with a subwoofer helps more than usual for a speaker this size.
Cons: A dip of about 3dB in the 1-3kHz crossover region (on-axis, in the predicted in-room response, and even off-axis) gives the speaker a soft, “laid-back” character that noticeably saps attack and transient bite from drums, guitar and other percussive material - possibly an intentional BBC-style dip, but one the reviewer would still prefer tuned flat. Vertical directivity is unusually tight for this class of speaker, holding together only within about ±5° of the tweeter axis before a real hole opens up in the response, so seating height matters a lot more than on most bookshelf designs. Diffraction artifacts around 3kHz and 5kHz show up as differences between the listening-window and on-axis curves. Distortion climbs well past acceptable levels at higher output - harmonic distortion exceeds 3% around 150Hz at 96dB (versus under 1% at 86dB), multitone distortion tops 10% at 96dB/1m, and real compression sets in between 96-102dB (about 1.5dB of lost dynamic range around 300Hz at 102dB/1m, roughly equivalent to 92dB for a pair at 4m in a room) - a genuine limitation on how loud or how far away this speaker can be pushed. Measured average sensitivity (84dB) runs a few dB below the 87dB spec. Only a 5” woofer, so a subwoofer is required for real bass. Discontinued.
Full Wharfedale Diamond 12.1 review and specifications →
| Bass Extension (-10dB) | 46Hz (measured, Erin's Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 61Hz (measured, Erin's Audio Corner) |
| Crossover Frequency | 2.6kHz |
| Dimensions | 12.2"H x 7"W x 10.9"D (310 x 178 x 277 mm) |
| Discontinued | Yes |
| Drivers | 5" advanced polypropylene cone woofer, 1" textile dome tweeter |
| Impedance | 8 ohms nominal (3.9 ohms minimum above 80Hz, measured, Erin's Audio Corner) |
| Sensitivity | 84dB (measured by Erin's Audio Corner; 87dB manufacturer specified) |
| Weight | 15 lbs / 6.8 kg each |
| Woofer Cabinet | ported |
As an eBay Partner, we may be compensated if you make a purchase.
- Links
- Reviews, Comparisons and Sound Samples
- Erin’s Audio Corner: Wharfedale 12.1 Budget Bookshelf Speaker with “Laid Back” sound but output limited.
- Audio Science Review Wharfedale Diamond 12.1
- Erin’s Audio Corner Website: Wharfedale Diamond 12.1
- Audio Science Review Measurements (spinorama.org)
- Reddit Search for Wharfedale Diamond 12.1 Review
- Head-to-Head Comparisons
- Wharfedale Diamond 12.1 vs Carmody S2000
- Wharfedale Diamond 12.1 vs Radiant Acoustics Clarity 4.2
- Wharfedale Diamond 12.1 vs Wharfedale Super Denton
- Wharfedale Diamond 12.1 vs Klipsch RP-500M II
- Wharfedale Diamond 12.1 vs KEF Q150
- Wharfedale Diamond 12.1 vs Wharfedale Diamond 220
- Wharfedale Diamond 12.1 vs Monitor Audio Silver 50 7G
- Wharfedale Diamond 12.1 vs Revel M105
- See all 21 comparisons
Polk Audio XT15: $179 Amazon Bhphotovideo Crutchfield
Pros: Very low $179/pair entry price for a Hi-Res Audio Certified 2-way design that’s Dolby Atmos and DTS:X compatible, and works with either 4- or 8-ohm amplifier outputs so it drops into almost any AVR without matching concerns. Directivity spread is reasonably even for the price (directivity_spdi_stddev 3.60).
Cons: Bass rolls off earlier than most of this batch at 77.6Hz (-3dB) / 54.2Hz (-10dB). On-axis deviation is the roughest measured figure here (aad_on_axis 0.449), and listening-window smoothness (0.303) trails the pricier options in this group. Modest 86dB sensitivity wants a reasonably powered amp channel. The 5.25” bi-laminate paper woofer is Polk’s entry-tier driver, not the polypropylene/Turbine cones used in its pricier Signature Elite/Reserve lines.
Full Polk Audio XT15 review and specifications →
| Bass Extension (-10dB) | 54.2Hz (measured, spinorama.org) |
|---|---|
| Bass Extension (-3dB) | 77.6Hz (measured, spinorama.org) |
| Dimensions | 16.51 x 18.24cm (6.5 x 7.18 in), 4.08kg (9 lb) each |
| Drivers | 1" Terylene dome tweeter, 5.25" bi-laminate paper woofer |
| Impedance | 4/8-ohm compatible |
| Sensitivity | 86dB (1W/1m) |
| Weight | 9 lbs / 4.08 kg (9 lb) each |
| Woofer Cabinet | Ported |
As an eBay Partner, we may be compensated if you make a purchase.
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Polk Audio XT15 vs Neumi Silk 4
- Polk Audio XT15 vs Wharfedale Diamond 220
- Polk Audio XT15 vs KEF Q150
- Polk Audio XT15 vs JBL Studio 530
- Polk Audio XT15 vs ELAC Debut 2.0 B5.2
- Polk Audio XT15 vs Sony SS-CS5 M2
- Polk Audio XT15 vs Paradigm Monitor SE Atom
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