Specifications

86
Technical Specifications:
The following data were measured on the axis of the capsules. A standard 48 V phantom power supply was used
and the load impedance was 1 kOhm.
Classification of the special capsules: pressure transducer
Recording angle
+
for full stereo reproduction: ca. 90°
Frequency range: 18 Hz – 16 kHz
Sensitivity: 100 mV/Pa
Equivalent noise level, CCIR**: 25 dB
Equivalent noise level, A-weighted*: 17 dB-A
Signal-to-noise ratio, A-weighted*: 77 dB-A
Maximum sound pressure level for 0.5% THD: 123 dB-SPL
Output voltage at maximum SPL: 2.8 V
Source impedance: 60 Ohms
Minimum recommended load impedance: 600 Ohms
Powering: 12 V ± 1 V or 48 V ± 4 V phantom
Current consumption per channel: 4.4 mA, independent of the supply voltage;
at high sound pressure levels slightly more
Measuring conditions: see page 134
Weight: ca. 1.1 kg
Diameter of the sphere: 200 mm
Total weight of the suspension device: ca. 0.5 kg
Surface finish: matte gray
Pin assignment (XLR-5M): see page 133
Accessories (included):
– HKFM, a universal device for suspending the KFM 6
on lines
– KG, ball-and-socket joint for
mounting the KFM 6 on a stand
– AK SU/2U, adapter cable (XLR-
5F to 2 × XLR-3M)
Accessories (optional):
– KKFM, wooden shipping case
for the KFM 6 and accessories
such as the mounting and sus-
pension devices, other hard-
ware, cables, etc.;
dimensions: 385 x 325 x
230 mm, weight: 4.2 kg
– WKFM (see previous page), a foam windscreen for
outdoor use in moderate wind. It has minimal effect
on the sound pickup (diam. 200 / 240 mm x 40 mm)
– XLR-5 stereo cables (page 116)
Frequency response curve on the stereo main axis
20 50 100 200 500 1k 2k 5k 10k 20kHz
+10
-10
0dB
-20
* This is the range within which the sound sources should be placed, as “seen“ by the microphone.
Sphere Stereo
quencies, are responsible for the remarkably natural
impression of space, depth and image typical of the
KFM 6.
Some practical information about the KFM 6:
– The recording room should have a good sound.
– In practice, the recording angle
+
of the KFM 6 has a
fixed value of 90°.
– A LED pinpoints the stereo main axis. This is espe-
cially useful when the KFM 6 is positioned at some
distance.
– The sensitivity of the KFM 6 is about 15 – 20 dB
higher than that of a standard Colette series micro-
phone.
– The KFM 6 can operate into unbalanced inputs with-
out any loss of level and without transformers. This
requires a powering device with DC decoupling.
– Any standardized 12 V or 48 V phantom powering
is suitable.
Please note: When a 12 V phantom power ing is
used, the maximum SPL is reduced by 7 dB.
– In order to assure proper operation, make sure that
both channels are powered simultaneously at all
times.
*IEC 61672-1, **IEC 60268-1