Short answer: the Wharfedale Diamond 12.1 for better sound quality, the Boston Acoustics A25 for the lower price. The Wharfedale Diamond 12.1 ranks #13 of 56 bookshelf speakers at $599. The Boston Acoustics A25 ranks #22 at $299.98, $299.02 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. Watch for: 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.
What the Boston Acoustics A25 gets right: CEA2034 spinorama is decent once you ignore a peak around 900Hz and a dip around 3kHz - directivity is good enough that the response can be EQed and won’t be too room-dependent. The catch: A crazy port resonance and a tweeter with a steeper rolloff than the woofer both show up in the near-field driver measurements, creating the 900Hz peak and the crossover-region dip.
Buy the Wharfedale Diamond 12.1 if sound quality matters more than the price. Buy the Boston Acoustics A25 if the price matters more than sound quality.
Specifications Side By Side
| Wharfedale Diamond 12.1 | Boston Acoustics A25 | |
|---|---|---|
| Price | $599 Discontinued | $299.98 Discontinued |
| Ranked | #13 of 56 in Medium Size Bookshelf Speakers | #22 of 56 in Medium Size Bookshelf Speakers |
| Bass Extension (-10dB) | 46Hz (measured, Erin’s Audio Corner) | 55Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 61Hz (measured, Erin’s Audio Corner) | 90Hz (measured, Audio Science Review) |
| Crossover Frequency | 2.6kHz | - |
| Dimensions | 12.2"H x 7"W x 10.9"D (310 x 178 x 277 mm) | 10.7H x 7.25W x 8.9D in |
| Impedance | 8 ohms nominal (3.9 ohms minimum above 80Hz, measured, Erin’s Audio Corner) | 8 ohms nominal |
| Sensitivity | 84dB (measured by Erin’s Audio Corner; 87dB manufacturer specified) | 85dB (2.83V/1m, measured, Audio Science Review) |
| Drivers | 5" advanced polypropylene cone woofer, 1" textile dome tweeter | 1" Kortec soft dome tweeter, 5.25" ceramic/glass-fiber polymer mid/woofer |
| Discontinued | Yes | Yes |
| Weight | 15 lbs / 6.8 kg each | 10.1 lbs / 4.58 kg each |
| Woofer Cabinet | ported | ported, rear |
| Frequency Response | - | 55Hz - 25kHz (Manufacturer specified) |
| Power Handling | - | 10-150W recommended |
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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 |
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- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- 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 Revel M105
- Wharfedale Diamond 12.1 vs Wharfedale Diamond 220
- Wharfedale Diamond 12.1 vs Arendal 1961 Monitor
- Wharfedale Diamond 12.1 vs KEF LS50 Meta
- See all 18 comparisons
Boston Acoustics A25: $299.98 Discontinued
Pros: CEA2034 spinorama is decent once you ignore a peak around 900Hz and a dip around 3kHz - directivity is good enough that the response can be EQed and won’t be too room-dependent. Cabinet fit and finish is well above its price class, and dynamics were strong with no distortion audible even at high volume on well-recorded material. Discontinued, but the reviewer suggests hunting for clearance pricing on remaining stock.
Cons: A crazy port resonance and a tweeter with a steeper rolloff than the woofer both show up in the near-field driver measurements, creating the 900Hz peak and the crossover-region dip. The rear port itself measured audibly distorted up close, though it wasn’t noticeable from normal listening distance in the reviewer’s room. Discontinued.
Full Boston Acoustics A25 review and specifications →
| Bass Extension (-10dB) | 55Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 90Hz (measured, Audio Science Review) |
| Dimensions | 10.7H x 7.25W x 8.9D in |
| Discontinued | Yes |
| Drivers | 1" Kortec soft dome tweeter, 5.25" ceramic/glass-fiber polymer mid/woofer |
| Frequency Response | 55Hz - 25kHz (Manufacturer specified) |
| Impedance | 8 ohms nominal |
| Power Handling | 10-150W recommended |
| Sensitivity | 85dB (2.83V/1m, measured, Audio Science Review) |
| Weight | 10.1 lbs / 4.58 kg each |
| Woofer Cabinet | ported, rear |
As an eBay Partner, we may be compensated if you make a purchase.
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