Borea BR09
speaker
$1,800
Used market: $1,295*
Specifications
7 of 6 values have a recorded sourceExpert Audio Engineering Commentary
Amplification Warning
Three 16 cm woofers in parallel below 310 Hz, 92 dB/W/m, minimum 3.3 ohms. The extra woofer over the BR08 raises the minimum slightly rather than lowering it, because the lower crossover point is higher and the array hands over sooner. Still an amplifier that must be comfortable into 4 ohms.
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 (~72% retained value). · checked on 8/5/2026