Short answer: the Polk Monitor XT20 on price, the HiVi Swans mod on measured smoothness. The XT20 is a two-way bookshelf with a 1” tweeter and 6.5” woofer, but its treble is notably bright, elevated roughly 1-5dB above the midrange, a trait shared across the whole Polk XT line. The HiVi Swans 3.1A mod’s CEA2034 spinorama shows a mostly smooth on-axis response for a DIY three-way kit, though some directivity error appears around 2.1kHz on-axis.
Buy the HiVi Swans 3.1A Sehlin Sound Solutions mod. It is rated higher for sound quality, and the $87.49 saving on the Polk Monitor XT20 is not enough to make up the difference.
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Specifications Side By Side
| HiVi Swans 3.1A Sehlin Sound Solutions mod | Polk Monitor XT20 | |
|---|---|---|
| Price | $364.99 per pair for the kit (assembly required) | $277.50 per pair |
| Ranked | #97 of 222 in Large Size Bookshelf Speakers | #157 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 38Hz (measured, Audio Science Review) | 43.4Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) |
| Bass Extension (-3dB) | 60Hz (measured, Audio Science Review) | 64.5Hz (measured, Erin’s Audio Corner) |
| Impedance | 4 ohms nominal, 3.8 ohms minimum (measured, Audio Science Review) | 8 ohms nominal (measured, Erin’s Audio Corner) |
| Drivers | 6.5” Kevlar woofer, 2” Dome midrange, 1” Soft Dome tweeter | 6.5” bilaminate paper cone woofer, 1” Terylene dome tweeter |
| Sensitivity | 86.5dB (measured, Audio Science Review) | 86dB (measured by Erin’s Audio Corner; 87dB manufacturer specified) |
| Woofer Cabinet | ported, rear | ported |
| Weight | 13.7 lbs (6.2 kg) | 11.9 lbs (5.4 kg) each |
| Dimensions | 16.5”H x 8.5”W x 13”D (420.0 x 215.0 x 330.0 mm) | 13”H x 7.5”W x 11”D (330.2 x 190.5 x 279.4 mm) |
| Spinorama Preference Score | 5.8 (derived from ASR thread measurement data) | 4.71 |
| Spinorama Preference Score with Perfect Sub | 7.6 (derived from ASR thread measurement data) | 7.07 |
| DIY Kit | Yes | No |
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