LAB REPORT

摘要

Just as with its Sopra N°2 [HFN Sep '15], Focal claims 91 dB sensitivity for the Sopra N°3 but our measured pink noise figure falls significantly short of the specified figure, in this case by 2.5dB. Also as with the N°2, low impedance is a factor in achieving this sensitivity. Focal specifies a minimum impedance modulus of 3.1 ohm (which is more compatible with a 4ohm nominal rating rather than the specified 8ohm) but we measured a dip down to 2.7ohm at 102Hz. Combined with high impedance phase angles at low frequencies this results in a minimum EPDR (equivalent peak dissipation resistance) of 1.1ohm at 75Hz-the same figure we obtained with the N°2, so the N°3 is likewise challenging to its partnering amplifier.