Short answer: the Audio First Fidelia. It ranks #1 of 179 bookshelf speakers by sound quality (rated 4.8/5); the Polk Audio XT15 ranks #51 (rated 3.7/5).
Why pick the Polk Audio XT15: Very affordable bookshelf speakers that work with 4 or 8 ohm receivers, an easy fit for stereo or home theater surrounds. The catch: Bass rolls off early, at 77.6Hz (-3dB) and 54.2Hz (-10dB).
The Audio First Fidelia is the more accurate, deeper-bass option. An excellent medium bookshelf speaker, a compact kit with remarkably accurate sound and good bass for its size at a great value. Its measured preference score, a predictor of how neutral it sounds, is 6.45 against 4.56 for the Polk Audio XT15. Its bass reaches about 53Hz before falling 3dB, against 77.6Hz for the Polk Audio XT15. The catch: Kit assembly required; lower sensitivity (~83-85 dB vs. typical 85 dB average) demands adequate amplifier power.
Buy the Audio First Fidelia. It is rated higher for sound quality than the Polk Audio XT15.
Still deciding? The full Passive Home rankings cover every ranked option.
Very affordable bookshelf speakers that work with 4 or 8 ohm receivers, an easy fit for stereo or home theater surrounds.
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.
As an eBay Partner, we may be compensated if you make a purchase.
Specifications Side By Side
| Polk Audio XT15 | Audio First Fidelia | |
|---|---|---|
| Price | $179.00 per pair | £950 per pair for the flatpack kit (assembly required) |
| Ranked | #51 of 179 in Medium Size Bookshelf Speakers | #1 of 179 in Medium Size Bookshelf Speakers |
| Bass Extension (-10dB) | 54.2Hz (measured, spinorama.org) | 38Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 77.6Hz (measured, spinorama.org) | 53Hz (measured, Erin’s Audio Corner) |
| Dimensions | 16.51 x 18.24cm (6.5 x 7.18 in), 4.08kg (9 lb) each | 11.8”H x 7.1”W x 11.7”D (300 x 180 x 297.6 mm) |
| Impedance | 4/8-ohm compatible | 4 ohms |
| Sensitivity | 86dB (1W/1m) | 84dB |
| Drivers | 1” Terylene dome tweeter, 5.25” bi-laminate paper woofer | 5” ceramic-aluminum cone woofer, 1” ceramic-aluminum tweeter |
| Weight | 9 lbs (4.08 kg) each | 15 lbs (6.8 kg) each |
| Woofer Cabinet | Ported | ported, rear |
| Spinorama Preference Score | 4.56 | 6.45 |
| Spinorama Preference Score with Perfect Sub | 7.31 | 8.46 |
| DIY Kit | No | Yes |
| Crossover Frequency | - | 1560Hz |
Related Speaker Comparisons
How Audio First Fidelia compares with other leading options: