Short answer: the Audio First Fidelia. It ranks #1 of 179 bookshelf speakers by sound quality (rated 4.8/5); the XMechanik Mechano23 DIY ranks #6 (rated 4.4/5).
The Fidelia is the more accurate kit and the top-rated bookshelf in its class. Its 5-inch woofer and 1-inch tweeter, both ceramic-aluminum, reach 53Hz before falling 3dB, with a preference score of 6.45, and Erin’s Audio Corner adopted it as a tonal reference. It is sold as a kit direct from a UK maker, so shipping and lead times apply, and its 83 to 85dB sensitivity needs a capable amplifier.
The Mechano23 is a full DIY build at a fraction of the cost. A Scan-Speak horn-loaded tweeter and SB Acoustics woofer measured nearly perfect predicted in-room response at Audio Science Review, with very low on-axis deviation and an unusually well-damped bass that reaches 77.6Hz before falling 3dB. You source the drivers and crossover kit separately and build the cabinet yourself, and its off-axis energy is less even than its on-axis results.
Buy the Audio First Fidelia. It is rated higher for sound quality than the XMechanik Mechano23 DIY.
Looking for alternatives? See the complete Passive Home rankings.
A DIY bookshelf design with exceptionally accurate sound that rivals far pricier speakers for a modest parts cost.
An excellent medium bookshelf speaker, a compact kit with remarkably accurate sound and good bass for its size at a great value.
Prices on this page were last checked October 31, 2026 at 7:11 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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Specifications Side By Side
| XMechanik Mechano23 DIY | Audio First Fidelia | |
|---|---|---|
| Price | $200 per pair DIY parts | £950 per pair for the flatpack kit (assembly required) |
| Ranked | #6 of 179 in Medium Size Bookshelf Speakers | #1 of 179 in Medium Size Bookshelf Speakers |
| Enclosure | ported | - |
| Drivers | Scan-Speak Discovery H2606/9200 1” horn loaded textile dome tweeter, SB Acoustics SB13PFCR25-4 5” fiber cone woofer | 5” ceramic-aluminum cone woofer, 1” ceramic-aluminum tweeter |
| Dimensions | 11.4”H x 6.9”W x 10.4”D (290 x 174 x 263 mm) | 11.8”H x 7.1”W x 11.7”D (300 x 180 x 297.6 mm) |
| Sensitivity | 85.1dB @ 2.83V/1m (measured, Audio Science Review) | 84dB |
| Bass Extension (-3dB) | 77.6Hz (measured, Audio Science Review) | 53Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-10dB) | 42.4Hz (measured, Audio Science Review) | 38Hz (measured, Erin’s Audio Corner) |
| Port Tuning | Approximately 45Hz | - |
| Cabinet Material | 18mm Baltic birch plywood | - |
| Country | Design origin: United States (ASR forum); assembled by buyer | - |
| Spinorama Preference Score | 5.42 | 6.45 |
| Spinorama Preference Score with Perfect Sub | 7.88 | 8.46 |
| Impedance | 4.1 ohms nominal (measured, ASR) | 4 ohms |
| DIY Kit | Yes | Yes |
| Crossover Frequency | - | 1560Hz |
| Weight | - | 15 lbs (6.8 kg) each |
| Woofer Cabinet | - | ported, rear |
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