Band: opinion spread · Dot: weighted average
Sources split, though the measurements largely agree. Most reviewers and all three labs describe a natural, even balance with a gentle warm tilt (Erin's Audio Corner: within about ±2 dB above 70 Hz; Audio: a response sloping gently down toward the treble). A smaller group hears a coloured or bass-heavy speaker (HIFI.DE says it is not always tonally correct), and GR-Research's own measurements show the bass sitting a few dB above the treble.
Measured
Klippel NFS (Erin's Audio Corner, grille on): about ±2 dB above ~70 Hz, F3 50 Hz; spinorama.org preference score 6.07 (7.87 with a subwoofer). Stereophile (MLSSA, grille on): 'superbly flat and even up to 15kHz'. Audio (Poland): a response sloping gently down toward high frequencies with the bass slightly emphasised. STEREO: a balanced response that falls gently toward the top. GR-Research (shop measurement at 1 W/1 m): about 91 dB in the bass against about 87 dB at the top.
vs. listeners — The labs agree on a gently downward-tilted response; the split is mostly over whether that tilt reads as natural warmth or as bass weight. The 'coloured' camp includes the two least controlled measurements (GR-Research and an AVForums owner's rig) and listeners pairing it with warm vintage amplifiers.
“The data shows a very linear speaker within about ±2dB above about 70Hz and an F3 of 50Hz, putting typical in-room extension to around 40Hz.”
Erin's Audio Corner
“Dass er tonal nicht immer korrekt zu Werke geht und deshalb Stimmen manchmal an Instrumente erinnern oder Stimmen wie Instrumente klingen, ist ein Effekt, der dir gefallen muss.”
HIFI.DE (Tim Hundenborn)
