SCHOEPS VMS 5 U - Manual (Page 16)

16
15. Technical Specifications
Inputs
Switchable between two XLR-3 sockets and a
special input for the SCHOEPS KCY “active
cable.”
XLR inputs are balanced and transformerless;
the 48 Volt phantom powering is switchable
(for subsequent M/S dematrixing).
Input impedance: 20 kOhm
Recommended min imum sensitivity of micro-
phones at XLR inputs: 8 mV/Pa
Maximum input level for <0.5% THD:
at 4 dB gain setting: 14 dBV (5V
rms
)
at 20 dB gain setting: -2.2 dBV (780 mV
rms
)
Preamplifier gain settings: 4, 10, 20, 30 or 40 dB
Overall performance specifications of VMS 5 U
with SCHOEPS CMC 64 (cardioid):
Equivalent noise level: 25,5 dB (CCIR, qps);
15 dB (A-weighted)
Maximum sound pressure level:
(at 4 or 10 dB gain): limited by CMC micro-
phone amplifier to 132 dB
(at 20 dB gain): 130 dB
(at 30 dB gain): 120 dB
(at 40 dB gain): 109 dB
Level indicators: -20 dB, -3 dB
The “Balance” potentiometer permits compen-
sation for differences in microphone sensitivity.
A polarity inversion switch permits rapid change
of channel assignments in M/S recording.
Outputs
The outputs are impedance-balanced, trans-
formerless and are switchable between the
amplified microphone signals and the decoded
M/S stereo signals.
Output impedance: 100 Ohm
Maximum output level for <0.5% THD:
18 dBV (8 V
rms
)
Recommended load impedance: 2 kOhm or
greater
Headphone output
Switchable; either the amplified microphone sig-
nals (=left/right for A/B recordings, or mid/side
for M/S) or the de coded M/S stereo signals
can be monitored.
Headphone impedance: 32 - 2,000 Ohms
Headphone socket: ¼” stereo phone jack
Filters
An infrasonic filter (20 Hz, 18 dB/oct.) is perma-
nently active. In addition, a low-cut filter
(150 Hz, 6 dB/oct.) can be switched on.
The upper frequency limit is 80 kHz.
Powering
An internal filter/regulator circuit which gener-
ates and stabilizes the supply voltages permits a
wide range of input voltages (5.5 V to 15.5 V).
Operation with internal batteries (possi-
bly rechargeable)
Number and type of cells: 6 x AA (also called
LR6)
Recommended primary cell type: Alkaline
Recommended rechargeable cell type: NiMH
A user-replaceable fuse protects against revers-
ing the polarity of the batteries.
Battery life with alkaline cells: ca. 8.5 hours
Battery life with rechargeable batteries:
ca. 3 hours (700 mAh NiCd)
ca. 5 hours (1100 mAh NiMH)
ca. 5,5 hours (1300 mAh NiMH)