The SunAudio Purified 4 ranks #9 out of 90 total Medium Size Bookshelf Speakers for sound quality. See all Passive Home rankings for every top pick.
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#9 SunAudio Purified 4: $3,650 per pair as tested; modular kit, pricing varies by driver/finish configuration SunAudio eBay
Pros: On-axis response is essentially dead flat from 100Hz to 20kHz, staying within about ±1dB through most of the band and widening only to a gentle +1.5dB rise in the top octave. The listening window curve tracks on-axis almost exactly, meaning off-axis output stays consistent rather than diverging. Both directivity index curves rise smoothly and monotonically from the bass straight through to 20kHz with no bumps, dips, or discontinuities: a sign of very well-integrated driver-to-driver handoff from the beryllium-dome tweeter. Early reflections and sound power both decline smoothly with frequency, with no resonant peaks anywhere in the response. The manufacturer’s own preference-score modeling comes out to 6.65 unequalized (rising to 9.36 with an ideal subwoofer) with a frequency deviation of just 0.8dB across 300Hz-5kHz: genuinely flagship-tier numbers for a 4-inch woofer design. Distinctive modular build: separate CNC-machined aluminum enclosures for the Purifi 4” woofer and BlieSMa T25A beryllium-dome tweeter, mounted on their own tripod stand, with cone-material and finish options. Measured sensitivity of 84.4dB.
Cons: A 4-inch woofer means real bass extension is limited (-3dB around 71Hz and -10dB around 53Hz) so a subwoofer is needed for anything below the low-100s. Measured sensitivity of 84.4dB is on the low side, meaning it needs more amplifier power than more efficient designs to reach the same volume. This is manufacturer self-measured data with no independent third-party review, so there’s no outside verification of distortion, unit-to-unit consistency, or how the reference crossover performs outside SunAudio’s own lab. The modular two-sphere design and tripod stand is unconventional, and pricing is steep for such a small woofer given the niche, boutique nature of the brand.
How it compares: Just above it: Arendal 1961 Monitor - $2500 cheaper, 1.5Hz higher bass extension (-3dB). Just below it: Ascend Acoustics Luna V2 Mini-Monitor Titan - $2752 cheaper, 2.4Hz lower bass extension (-3dB).
| Bass Extension (-10dB) | 53Hz (measured, manufacturer spinorama data) |
|---|---|
| Bass Extension (-3dB) | 71Hz (measured, manufacturer spinorama data) |
| DIY Kit | No |
| Dimensions | 34.6” x 12.2” x 11” (880 x 310 x 280 mm) |
| Drivers | BlieSMa T25A beryllium-dome tweeter (own CNC aluminum enclosure), Purifi 4” Ultra Low Distortion Extended woofer (PP-coated paper/fiber cone) |
| Impedance | 4 ohms |
| Power Handling | 200W long-term max (woofer) |
| Sensitivity | 84.4dB (2.83V/1m, measured, manufacturer spinorama data) |
| Spinorama Preference Score | 6.73 (manufacturer spinorama data) |
| Spinorama Preference Score with Perfect Sub | 9.44 (manufacturer spinorama data) |
| Woofer Cabinet | sealed, separate spherical driver modules on tripod stand |
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