Short answer: the HiVi Swans 3.1A Sehlin Sound Solutions mod. It ranks #13 of 47 bookshelf speakers at $346.74; the Zu Audio Method ranks #47 and costs $700, so there is not much of a tradeoff to weigh.
On the HiVi Swans 3.1A Sehlin Sound Solutions mod side: CEA2034 spinorama shows a mostly smooth on-axis response for a DIY three-way kit. The catch: Some directivity error appears around 2.1kHz on-axis.
The case for the Zu Audio Method: High-sensitivity design (measured about 90-90.7dB average through the 300Hz-3kHz vocal range). Set against that: A severe suckout in the 1.5-3kHz range (down as much as 19dB below the mean at its worst) removes attack and clarity from brass, woodwinds.
Buy the HiVi Swans 3.1A Sehlin Sound Solutions mod if the ranking matters more than the price. Buy the Zu Audio Method if the price matters more than the ranking.
Specifications Side By Side
| HiVi Swans 3.1A Sehlin Sound Solutions mod | Zu Audio Method | |
|---|---|---|
| Price | $346.74 for the kit (assembly required) | $700 |
| Ranked | #13 of 47 in Large Size Bookshelf Speakers | #47 of 47 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 38Hz | 56Hz |
| Bass Extension (-3dB) | 60Hz | 92Hz |
| Impedance | 4 ohms | 8 ohms |
| Drivers | 6.5" Kevlar woofer, 2" Dome midrange, 1" Soft Dome tweeter | 8" coax HE (Eminence/Zu) woofer, Eminence ASD-1001 tweeter |
| Sensitivity | 87dB | 91dB |
| Woofer Cabinet | Rear ported | Front ported |
| Weight | 13.7 lbs / 6.2 kg | 12.1 lbs / 5.5 kg |
The Two Speakers In Full
HiVi Swans 3.1A Sehlin Sound Solutions mod: $346.74 for the kit (assembly required) Amazon
Pros: CEA2034 spinorama shows a mostly smooth on-axis response for a DIY three-way kit. Horizontal beamwidth of about ±70 degrees is wide and consistent. Distortion stays under control down to 40Hz at 96dB SPL/1m, a strong result for a 6.5” woofer in this class.
Cons: Some directivity error appears around 2.1kHz on-axis. Predicted in-room response needs about 1-2dB of correction to fit an ideal target curve. Vertical directivity is just okay, so listening height matters more than with a coincident design. Minimum impedance dips to 3.8 ohms with several peaks, a moderately demanding load. Requires DIY assembly (kit only), with additional Sehlin-mod parts and labor beyond the base kit price.
| Bass Extension (-10dB) | 38Hz |
|---|---|
| Bass Extension (-3dB) | 60Hz |
| Drivers | 6.5" Kevlar woofer, 2" Dome midrange, 1" Soft Dome tweeter |
| Impedance | 4 ohms |
| Sensitivity | 87dB |
| Weight | 13.7 lbs / 6.2 kg |
| Woofer Cabinet | Rear ported |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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- HiVi Swans 3.1A Sehlin Sound Solutions mod vs GR-Research NX-Studio
- HiVi Swans 3.1A Sehlin Sound Solutions mod vs GR-Research X-LS Encore
- HiVi Swans 3.1A Sehlin Sound Solutions mod vs ELAC Debut 2.0 B6.2
- HiVi Swans 3.1A Sehlin Sound Solutions mod vs Polk Monitor XT20
- Links
Zu Audio Method: $700 Zuaudio
Pros: High-sensitivity design (measured about 90-90.7dB average through the 300Hz-3kHz vocal range), making it easy to drive to loud levels with modest amplifier power. Not a difficult electrical load - minimum impedance around 5.8 ohms, compatible with most 8-ohm-rated amplifiers, though Class A/AB amps should have good ventilation given a 3-ohm minimum EPDR. Verified not to be a defective unit: both speakers in the pair measured consistently with each other, and an independent reviewer’s own measurements of the same model matched the findings here.
Cons: A severe suckout in the 1.5-3kHz range (down as much as 19dB below the mean at its worst) removes attack and clarity from brass, woodwinds, and snares, and gives an overall laid-back, unengaging character. Erratic, inconsistent high-frequency response - alternating between accentuated and subdued at different frequencies - makes cymbals, hi-hats, and sibilant vocal sounds behave unpredictably from track to track. Directivity is poor and inconsistent with frequency, meaning off-axis (sidewall-reflected) energy is actually louder than the direct sound in several bands - a problem that fundamentally cannot be corrected with EQ, since boosting the direct sound would boost the already-too-loud reflections even more. High sensitivity comes at the direct cost of bass extension: F3 of 92Hz and F10 of 56Hz mean essentially no meaningful bass. Despite the high sensitivity, dynamic headroom is poor rather than better as often assumed - distortion in the higher frequencies creates what the reviewer calls an “electronic glare.” Third-order harmonic distortion peaks sharply around 6-7kHz, contributing to an edgy, metallic quality on cymbals and hi-hats, and multitone distortion crosses the reviewer’s 3% threshold. Instantaneous compression testing shows serious dynamic-range issues specifically in the treble (a dip around 2kHz, a peak around 4kHz, and a large dip across 5-7kHz). Vertical radiation has an unusually narrow sweet spot, since the midrange driver beams while the tweeter stays wide, creating a mismatch. Switching to a high-output-impedance amplifier shifts the response by roughly 1-1.5dB in places but doesn’t come close to correcting the fundamental frequency-response problems. Toeing the speakers out reduces some of the on-axis dip’s severity but doesn’t restore a properly immersive soundstage, since off-axis and on-axis response remain too different from each other.
| Bass Extension (-10dB) | 56Hz |
|---|---|
| Bass Extension (-3dB) | 92Hz |
| Drivers | 8" coax HE (Eminence/Zu) woofer, Eminence ASD-1001 tweeter |
| Impedance | 8 ohms |
| Sensitivity | 91dB |
| Weight | 12.1 lbs / 5.5 kg |
| Woofer Cabinet | Front ported |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Links
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Product prices and availability were last checked August 9, 2026 at 6:57 AM UTC 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.