Borea BR02
speaker
$400
Used market: $290*
Specifications
7 of 6 values have a recorded sourceExpert Audio Engineering Commentary
Headroom Notes
Triangle labels the row «Sensitivity (dB/W/m)», so the 89 dB is already in the watt scale and needs no correction — unusual in this category, where nearly everyone quotes 2.83 V. On the declared 8-ohm nominal the two scales would coincide anyway, but the label removes the ambiguity that costs 1.25 dB on a 6-ohm rival and 3 dB on a 4-ohm one.
Amplification Warning
The nominal says 8 ohms; the minimum, printed one row below, says 3.6. For a 13 cm two-way that dip sits in the bass, where the music has most of its energy, so the amplifier meets 3.6 ohms exactly when it is working hardest. The recommended range of 15–100 W is quoted «(8 Ohms)», which is the nominal, not the load the amplifier actually sees.
What the datasheet actually says
Quoted verbatim from the manufacturer’s own page, with the date we checked it. We state what is printed, not what anyone intended by it.
«Nominal impedance is measured at a frequency of 1kHz - Minimum impedance is measured at low frequencies.»
Triangle defines its nominal impedance as the value measured at 1 kHz. That is not what nominal impedance means under IEC 60268-5, where the nominal value is a declared rating tied to the minimum of the impedance modulus across the working band, not a reading at one frequency. At 1 kHz most two-way cabinets sit near a local maximum between the bass resonance and the crossover, so a 1 kHz reading falls systematically on the flattering part of the curve. The company does print the true minimum in the row below, which is more than most of the industry does — read that number, not the 8 ohms.
checked 8/5/2026* Estimated with the depreciation fallback (~73% retained value). · checked on 8/5/2026