Short answer: the Perlisten S4b if sound quality matters most, the Triangle Borea BR03 if price matters most. The Perlisten S4b ranks #2 of 130 bookshelf speakers at $8000. The Triangle Borea BR03 ranks #109 at $399, $7601 cheaper.
What the Triangle Borea BR03 offers: Bass output is genuinely decent for the price - measured extension reaches F3 57Hz/F10 42Hz, which the reviewer had no real complaints about. Dual front-firing ports and a well-stuffed, well-braced cabinet. Solid build quality overall. Watch for: A noticeable mid-range suckout, most pronounced in the upper mid-range/lower treble, that the reviewer attributes to cabinet resonances and driver breakup rather than a deliberate voicing choice - it makes vocals and instruments sound recessed and thin rather than warm. Sibilance in the 4-8kHz region shows up on every track the reviewer tried. Measured minimum impedance dips to about 4.2 ohms (with an even lower EPDR), despite the speaker and its own rear panel being labeled 8 ohms - worth knowing if you’re planning to drive these with a receiver/AVR that assumes an 8-ohm nominal load. The reviewer is upfront that this speaker has a devoted following among other reviewers, but says he specifically doesn’t hear what they hear and wants people who own it to trust their own ears rather than assume something’s wrong with their hearing if they don’t love it either.
What the Perlisten S4b offers: Reference-grade directivity and output from a compact sealed monitor. Erin called its radiation behavior the smoothest he had measured: Perlisten’s DPC array (beryllium tweeter between two midrange domes) shapes vertical output while transitioning cleanly to the 7-inch woofer. Harmonic distortion remains below 1% at 86dB and, above 100Hz, also below 1% at 96dB; compression is exceptionally low. The response is highly linear, the midrange was a listening highlight, and the sealed F10 of 40Hz provides a predictable slope for subwoofer integration. Watch for: Erin measured only 84.5dB sensitivity and an impedance minimum just under 4 ohms, a difficult efficiency/load combination that deserves substantial clean amplification. Its 78Hz F3 means a subwoofer is effectively mandatory for full-range listening despite the 40Hz F10. A roughly +3dB feature around 10kHz appears on-axis, though Erin did not find it objectionable. Price is extreme for a stand-mount and the tightly managed vertical radiation makes correct stand height important.
Buy the Triangle Borea BR03 when the price outweighs sound quality for you, and the Perlisten S4b when sound quality outweighs the price instead.
The Triangle Borea BR03 is not a sound-quality pick. It sits near the bottom of the 130 bookshelf speakers; there are better options higher up.
Want more options? Browse the full Passive Home rankings.
Specifications Side By Side
| Triangle Borea BR03 | Perlisten S4b | |
|---|---|---|
| Price | $399.00 per pair | $8,000 per pair |
| Ranked | #109 of 130 in Large Size Bookshelf Speakers | #2 of 130 in Large Size Bookshelf Speakers |
| Drivers | 6.5" natural cellulose midwoofer, 1" (25mm) EFS silk dome tweeter | DPC array with 28mm beryllium tweeter and dual 28mm midrange domes; 7" woofer |
| Crossover Frequency | 3600Hz | - |
| Dimensions | 14.96"H x 8.11"W x 12.36"D | 16.5"H x 9.4"W x 7.3"D |
| Weight | 13.2 lbs (6 kg) each | 24.3 lbs (11 kg) each |
| Impedance | 8 ohms nominal (manufacturer spec), 4.2 ohms minimum (measured, Erin's Audio Corner) | Just under 4 ohms minimum (measured, Erin's Audio Corner) |
| Sensitivity | 87.5dB (measured at 2.83V/1m, Erin's Audio Corner) | 84.5dB/2.83V/1m (measured, Erin's Audio Corner) |
| Bass Extension (-3dB) | 57Hz (measured, Erin's Audio Corner) | 78Hz (measured, Erin's Audio Corner) |
| Bass Extension (-10dB) | 42Hz (measured, Erin's Audio Corner) | 40Hz (measured, Erin's Audio Corner) |
| Recommended Power | 100W | - |
| Woofer Cabinet | ported, dual front ports | sealed |
| Spinorama Preference Score | 3.12 | 4.58 |
| Spinorama Preference Score with Perfect Sub | 5.47 | 7.24 |
Related Speaker Comparisons
How Perlisten S4b compares with other leading options:
- Perlisten S4b vs KEF Reference 1 Meta
- GR-Research NX-Studio vs Perlisten S4b
- AsciLab C6B vs Perlisten S4b
- Perlisten S4b vs Audio First Cadentia 3
- KEF R3 Meta vs Perlisten S4b
Prices on this page were last checked September 16, 2026 at 12:41 AM 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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The Two Speakers In Full
Triangle Borea BR03: $399.00 per pair Amazon eBay
Pros: Bass output is genuinely decent for the price - measured extension reaches F3 57Hz/F10 42Hz, which the reviewer had no real complaints about. Dual front-firing ports and a well-stuffed, well-braced cabinet. Solid build quality overall. Measured bass extension of 57Hz (-3dB), with a measured sensitivity of 87.5dB.
Cons: A noticeable mid-range suckout, most pronounced in the upper mid-range/lower treble, that the reviewer attributes to cabinet resonances and driver breakup rather than a deliberate voicing choice - it makes vocals and instruments sound recessed and thin rather than warm. Sibilance in the 4-8kHz region shows up on every track the reviewer tried. Measured minimum impedance dips to about 4.2 ohms (with an even lower EPDR), despite the speaker and its own rear panel being labeled 8 ohms - worth knowing if you’re planning to drive these with a receiver/AVR that assumes an 8-ohm nominal load. The reviewer is upfront that this speaker has a devoted following among other reviewers, but says he specifically doesn’t hear what they hear and wants people who own it to trust their own ears rather than assume something’s wrong with their hearing if they don’t love it either.
Full Triangle Borea BR03 review and specifications →
| Bass Extension (-10dB) | 42Hz (measured, Erin's Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 57Hz (measured, Erin's Audio Corner) |
| Crossover Frequency | 3600Hz |
| Dimensions | 14.96"H x 8.11"W x 12.36"D |
| Drivers | 6.5" natural cellulose midwoofer, 1" (25mm) EFS silk dome tweeter |
| Impedance | 8 ohms nominal (manufacturer spec), 4.2 ohms minimum (measured, Erin's Audio Corner) |
| Recommended Power | 100W |
| Sensitivity | 87.5dB (measured at 2.83V/1m, Erin's Audio Corner) |
| Spinorama Preference Score | 3.12 |
| Spinorama Preference Score with Perfect Sub | 5.47 |
| Weight | 13.2 lbs (6 kg) each |
| Woofer Cabinet | ported, dual front ports |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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Perlisten S4b: $8,000 per pair Perlisten Dealer Locator eBay
Pros: Reference-grade directivity and output from a compact sealed monitor. Erin called its radiation behavior the smoothest he had measured: Perlisten’s DPC array (beryllium tweeter between two midrange domes) shapes vertical output while transitioning cleanly to the 7-inch woofer. Harmonic distortion remains below 1% at 86dB and, above 100Hz, also below 1% at 96dB; compression is exceptionally low. The response is highly linear, the midrange was a listening highlight, and the sealed F10 of 40Hz provides a predictable slope for subwoofer integration. Measured bass extension of 78Hz (-3dB), with a measured sensitivity of 84.5dB.
Cons: Erin measured only 84.5dB sensitivity and an impedance minimum just under 4 ohms, a difficult efficiency/load combination that deserves substantial clean amplification. Its 78Hz F3 means a subwoofer is effectively mandatory for full-range listening despite the 40Hz F10. A roughly +3dB feature around 10kHz appears on-axis, though Erin did not find it objectionable. Price is extreme for a stand-mount and the tightly managed vertical radiation makes correct stand height important.
Full Perlisten S4b review and specifications →
| Bass Extension (-10dB) | 40Hz (measured, Erin's Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 78Hz (measured, Erin's Audio Corner) |
| Dimensions | 16.5"H x 9.4"W x 7.3"D |
| Drivers | DPC array with 28mm beryllium tweeter and dual 28mm midrange domes; 7" woofer |
| Impedance | Just under 4 ohms minimum (measured, Erin's Audio Corner) |
| Sensitivity | 84.5dB/2.83V/1m (measured, Erin's Audio Corner) |
| Spinorama Preference Score | 4.58 |
| Spinorama Preference Score with Perfect Sub | 7.24 |
| Weight | 24.3 lbs (11 kg) each |
| Woofer Cabinet | sealed |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons