Short answer: the Focal Dome Flax, though neither ranks well in its class. It ranks #122 of 168 bookshelf speakers by sound quality, rated 2.6/5, at $800. The Zaph Audio ZA5.2 TM ranks #142, rated 2.3/5, at $383, $417 cheaper, which does not close the gap in sound quality. Both are rated below 3.0/5 among the 168 bookshelf speakers, and the Philharmonic Ceramic Mini, ranked #2 at $900, is a better place to start if sound quality matters.
The Focal Dome Flax is the better-sounding option. A compact sealed satellite with a 4” flax cone woofer and a 1” aluminium/magnesium inverted dome tweeter in a rounded cabinet that can be wall mounted or tilted on its stand. The catch: Bass is very limited, 128.9Hz (-3dB) and about 86Hz (-10dB), so it needs a subwoofer.
The Zaph Audio ZA5.2 TM is the more accurate, deeper-bass choice. CEA2034 spinorama shows a fairly smooth on-axis response. Its measured preference score, a predictor of how neutral it sounds, is 5.41 against 1.76 for the Focal Dome Flax. Its bass reaches about 70.3Hz before falling 3dB, against 128.9Hz for the Focal Dome Flax. The catch: Predicted in-room response is tilted upward toward the treble, which the reviewer flagged as a likely audible brightness.
Buy the Focal Dome Flax. It is rated higher for sound quality, and the $417 you would save on the Zaph Audio ZA5.2 TM does not close the gap.
Want more options? Browse the full Passive Home rankings.
Specifications Side By Side
| Focal Dome Flax | Zaph Audio ZA5.2 TM | |
|---|---|---|
| Price | $800 per pair | $383 per pair |
| Ranked | #122 of 168 in Medium Size Bookshelf Speakers | #142 of 168 in Medium Size Bookshelf Speakers |
| Drivers | 4” flax cone woofer, 1” aluminium/magnesium inverted dome tweeter | 5” ZA14W08 aluminum cone woofer, 1” DQ25SC16-04 titanium dome tweeter |
| Sensitivity | 88dB (2.83V/1m, manufacturer specified) | 82dB |
| Impedance | 8 ohms nominal (4 ohms minimum) | 8 ohms |
| Frequency Response | 80Hz-28kHz ±3dB (manufacturer specified) | - |
| Woofer Cabinet | sealed | ported, front |
| Dimensions | 6.8”H x 5.7”W x 5.6”D (172 x 144 x 143 mm) | 14”H x 8”W x 9.5”D (355.6 x 203.2 x 241.3 mm) |
| Weight | 4.2 lbs (1.9 kg) each | 9.3 lbs (4.2 kg) |
| Bass Extension (-3dB) | 128.9Hz (measured, Audio Science Review) | 70.3Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | about 86.2Hz (measured, Audio Science Review) | 42.9Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) |
| Spinorama Preference Score | 1.76 | 5.41 |
| Spinorama Preference Score with Perfect Sub | 5.48 | 7.60 |
| DIY Kit | No | Yes |
Frequency Response Compared
Both speakers’ spinorama measurements, overlaid. A flatter line is more neutral: peaks sound forward or harsh, dips sound recessed. Each curve is shifted so its average from 300 Hz to 3 kHz sits at 0 dB, so loudness differences between the two are removed and only the shape is compared.
Measurement data: Focal Dome Flax (measured by Audio Science Review) and Zaph Audio ZA5.2 TM (measured by Audio Science Review), via spinorama.org.
Related Speaker Comparisons
How Focal Dome Flax compares with other leading options:
- Triangle Borea BR02 vs Focal Dome Flax
- Focal Dome Flax vs Role Audio Skiff
- Moondrop M4P MTM vs Zaph Audio ZA5.2 TM
- Arendal 1961 Monitor vs Zaph Audio ZA5.2 TM
- JBL Studio 530 vs Zaph Audio ZA5.2 TM
Prices on this page were last checked October 11, 2026 at 4:59 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
Focal Dome Flax: $800 per pair Amazon eBay
Pros: A compact sealed satellite with a 4” flax cone woofer and a 1” aluminium/magnesium inverted dome tweeter in a rounded cabinet that can be wall mounted or tilted on its stand. Sensitivity is 88dB. Measured bass extension of 128.9Hz (-3dB).
Cons: Bass is very limited, 128.9Hz (-3dB) and about 86Hz (-10dB), so it needs a subwoofer. Audio Science Review measured an uneven response (0.93 average on-axis deviation), for a preference score of 1.76 that reaches 5.48 with an ideal subwoofer.
Full Focal Dome Flax review and specifications →
| Bass Extension (-10dB) | about 86.2Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 128.9Hz (measured, Audio Science Review) |
| DIY Kit | No |
| Dimensions | 6.8”H x 5.7”W x 5.6”D (172 x 144 x 143 mm) |
| Drivers | 4” flax cone woofer, 1” aluminium/magnesium inverted dome tweeter |
| Frequency Response | 80Hz-28kHz ±3dB (manufacturer specified) |
| Impedance | 8 ohms nominal (4 ohms minimum) |
| Sensitivity | 88dB (2.83V/1m, manufacturer specified) |
| Spinorama Preference Score | 1.76 |
| Spinorama Preference Score with Perfect Sub | 5.48 |
| Weight | 4.2 lbs (1.9 kg) each |
| Woofer Cabinet | sealed |
- Reviews, Comparisons and Sound Samples
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Zaph Audio ZA5.2 TM: $383 per pair Madisound eBay
Pros: CEA2034 spinorama shows a fairly smooth on-axis response. Cumulative spectral decay (waterfall) is clean overall, with only minor lingering energy around 400-700Hz. Measured bass extension of 70.3Hz (-3dB).
Cons: Predicted in-room response is tilted upward toward the treble, which the reviewer flagged as a likely audible brightness. Low sensitivity of about 82dB requires more amplifier gain than typical. Relative harmonic distortion is excessive in the low frequencies, climbing to 6-8% under a 10-volt test signal in the 60-150Hz region: notably worse than typical two-way designs in this price range. Impedance runs close to 7 ohms through much of the audible range, with additional peaks that make it a moderately demanding load for a low-sensitivity design. Vertical directivity narrows unevenly above about 1kHz, typical of this MTM-adjacent tweeter/woofer spacing.
Full Zaph Audio ZA5.2 TM review and specifications →
| Bass Extension (-10dB) | 42.9Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) |
|---|---|
| Bass Extension (-3dB) | 70.3Hz (measured, Audio Science Review) |
| DIY Kit | Yes |
| Dimensions | 14”H x 8”W x 9.5”D (355.6 x 203.2 x 241.3 mm) |
| Drivers | 5” ZA14W08 aluminum cone woofer, 1” DQ25SC16-04 titanium dome tweeter |
| Impedance | 8 ohms |
| Sensitivity | 82dB |
| Spinorama Preference Score | 5.41 |
| Spinorama Preference Score with Perfect Sub | 7.60 |
| Weight | 9.3 lbs (4.2 kg) |
| Woofer Cabinet | ported, front |
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- Reviews, Comparisons and Sound Samples
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