The KM1 - the Ultimate Listening Experience
KEF’s KM1 is a remarkable loudspeaker. Indeed, KM1 could fairly lay claim to being the Ultimate Loudspeaker.
To see KM1 for the first time is mildly awe-inspiring. To hear it is to be immediately struck by a sense of sureness, ease and authority in the reproduction of music, and indeed by how quiet they sound, despite the system’s enormous loudness capability. For KM1 is an exercise in low distortion and headroom. KM1 can ‘cruise’ when playing at very high volume levels, with power to spare, and yet achieve a degree of dynamic resolution unknown to virtually any other conventional loudspeaker system.
KM1 Specifications
| Frequency Response | 38Hz to 23kHz ± 2dB (-6dB at 34Hz and 25kHz) |
| Directional Characteristics | Within 1.5dB of reference axis response for ± 7.5º vertically, to 20kHz and for ± 15º horizontally, to 8kHz |
| Maximum Output | At least 120dB each third octave from 60Hz to 20kHz free field from one system at 1metre, or 2 systems at 2 metres. |
| Thermal Volume Compression | Typically less than 0.5dB at any frequency and at any level up to maximum output under normal programme conditions. |
| Distortion | Second and third harmonic less than 3.2% @ 110dB, less than 1% @ 90dB from 60Hz to 20kHz measured at 1m in anechoic conditions. |
| Input Impedance | 22k ohms - floating |
| Input sensitivity | Full output for nominal 0dBm input (0.774V) adjustable in 3dB steps from - 21dBm to + 12dBm. |
| Signal/Noise Ratio | >105dB |
| Driver complement | LF 4 x 30mm Bextrene direct radiator MF 2 x 110mm polypropylene direct radiator HF 1 x 50mm Mylar dome radiator. |
| Weight | 140kg (308lb) |
| Dimensions | 87mm (37/16 in.) |
| Overall Dimensions (H x W x D) |
763(h) x 1315(w) x 665(d)mm 30(h) x 51¾(w) x 26 1/8(d)in. |