Short answer: the Audio First Cadentia 3 is the proven choice, measured and ranked among bookshelf speakers, while the newer Harbeth M30.3 XD2 has no independent measurements yet and can only be compared on specs.
The case for the Harbeth M30.3 XD2: The current version of Harbeth’s Monitor 30, with an 8” (200mm) RADIAL4 mid/bass driver made by Harbeth and a 1” ferrofluid cooled tweeter in a compact front ported cabinet.
On the Audio First Cadentia 3 side: Near-textbook measurements: excellent on-axis linearity, listening window, and directivity, with only minor deviations.
Price: the Harbeth M30.3 XD2 lists at $6,290 and the Audio First Cadentia 3 at $7,199.
Buy the Audio First Cadentia 3 if you want a speaker whose sound quality has been measured and ranked.
Buy the Harbeth M30.3 XD2 if you prefer its design or features, and you can wait for measurements to confirm how it sounds.
Want more options? Browse the full Passive Home rankings.
Specifications Side By Side
| Harbeth M30.3 XD2 | Audio First Cadentia 3 | |
|---|---|---|
| Price | $6,290 per pair | $7199 per pair |
| Ranked | - | #7 of 131 in Large Size Bookshelf Speakers |
| DIY Kit | No | No |
| Dimensions | 460H x 277W x 275D mm | 23.2” x 11.8” x 17” (590 x 300 x 433 mm) |
| Drivers | 1” (25mm) ferrofluid cooled tweeter, 8” (200mm) RADIAL4 mid/bass driver | 1.1” tweeter, 4.5” midrange, 9” woofer |
| Frequency Response | 50Hz - 20kHz (+/-3dB, free space, manufacturer specified) | - |
| Impedance | 6 ohms | 4 ohms nominal (3.1 ohms minimum, measured by Erin’s Audio Corner) |
| Power Handling | 150W programme | - |
| Recommended Power | 25W per channel or more (manufacturer suggested) | - |
| Sensitivity | 85dB (2.83V/1m, manufacturer specified) | 86.4dB (2.83V/1m, measured by Erin’s Audio Corner) |
| Weight | 11.6 kg each | 45.9 lbs (20.8 kg) each |
| Woofer Cabinet | ported, front | 3-way, bass reflex |
| Bass Extension (-10dB) | - | 26Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | - | 43Hz (measured, Erin’s Audio Corner) |
| Country | - | United Kingdom (Cambridge) |
| Spinorama Preference Score | - | 7.55 |
| Spinorama Preference Score with Perfect Sub | - | 8.91 |
Prices on this page were last checked September 29, 2026 at 3:43 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
Harbeth M30.3 XD2: $6,290 per pair House of Stereo eBay
Older model: the Harbeth Monitor 30 (rated 2.5/5).
Pros: The current version of Harbeth’s Monitor 30, with an 8” (200mm) RADIAL4 mid/bass driver made by Harbeth and a 1” ferrofluid cooled tweeter in a compact front ported cabinet. Harbeth rates it at 50Hz to 20kHz within 3dB in free space with the grille on, and a 6 ohm load that it describes as easy to drive, with amplifiers from 25W per channel suggested. Handmade in England and offered in five real wood veneer finishes.
Cons: No independent measurements have been published for this version, so its linearity, directivity and real bass extension are unknown. The older Monitor 30 measured with a deep on axis dip around the crossover region, and it isn’t known whether this revision changes that. Sensitivity is a modest 85dB at 2.83V, and the 50Hz lower limit means most rooms will want a subwoofer for deep bass. Harbeth tunes it for placement away from walls, and it costs far more than most 2 way standmounts.
Full Harbeth M30.3 XD2 review and specifications →
| DIY Kit | No |
|---|---|
| Dimensions | 460H x 277W x 275D mm |
| Drivers | 1” (25mm) ferrofluid cooled tweeter, 8” (200mm) RADIAL4 mid/bass driver |
| Frequency Response | 50Hz - 20kHz (+/-3dB, free space, manufacturer specified) |
| Impedance | 6 ohms |
| Power Handling | 150W programme |
| Recommended Power | 25W per channel or more (manufacturer suggested) |
| Sensitivity | 85dB (2.83V/1m, manufacturer specified) |
| Weight | 11.6 kg each |
| Woofer Cabinet | ported, front |
- Links
- Reviews, Comparisons and Sound Samples
- These figures are manufacturer-specified rather than independently measured.
- Head-to-Head Comparisons
Audio First Cadentia 3: $7199 per pair Audio First Designs eBay
Pros: Near-textbook measurements: excellent on-axis linearity, listening window, and directivity, with only minor deviations. Extremely low distortion and compression, holding steady even at 102dB with barely any loss. Very wide, consistent horizontal dispersion (~70 degrees) gives a big, enveloping soundstage with strong image specificity outside the speaker boundaries. Strong bass extension for a bookshelf (F3 43Hz, F10 26Hz) with a punchy, guttural mid-bass. Measured bass extension of 43Hz (-3dB), with a measured sensitivity of 86.4dB.
Cons: A mild scoop through the upper midrange/lower treble slightly softens the attack of snares, hand claps, and sibilants: fixable with a single-band EQ (2.5kHz, +1dB, Q~1). High-frequency dispersion narrows quickly above about 4kHz, so off-axis listeners lose some air and detail. Very high asking price for a bookshelf-class speaker, and the complete (finished) version has a long lead time; the loaner kit version ships as an unfinished cabinet you assemble and finish yourself.
Full Audio First Cadentia 3 review and specifications →
| Bass Extension (-10dB) | 26Hz (measured, Erin’s Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 43Hz (measured, Erin’s Audio Corner) |
| Country | United Kingdom (Cambridge) |
| DIY Kit | No |
| Dimensions | 23.2” x 11.8” x 17” (590 x 300 x 433 mm) |
| Drivers | 1.1” tweeter, 4.5” midrange, 9” woofer |
| Impedance | 4 ohms nominal (3.1 ohms minimum, measured by Erin’s Audio Corner) |
| Sensitivity | 86.4dB (2.83V/1m, measured by Erin’s Audio Corner) |
| Spinorama Preference Score | 7.55 |
| Spinorama Preference Score with Perfect Sub | 8.91 |
| Weight | 45.9 lbs (20.8 kg) each |
| Woofer Cabinet | 3-way, bass reflex |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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