Oberon 5

Headroom Notes

88 dB at 2.83 V / 1 m, one decibel above the Oberon 3 despite twice the cone area — the extra drivers went into bass extension (39 Hz against 47 Hz at ±3 dB) rather than efficiency. On the 6-ohm nominal this is about 86.75 dB/W/m.

Amplification Warning

Two 5¼-inch bass units on a 6-ohm nominal, and again no published minimum. Where two drivers share a band in parallel the impedance below the crossover tends to halve, and that is precisely the region DALI leaves undocumented. The 30 W lower limit of the recommended power range is the more useful number here: it says the speaker needs current, not that it is fragile.