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9

control should normally remain at its
center detent setting.

In M/S recording, the Balance setting

controls the ratio of mid to side signal
and thus will affect the stereo image
width and the maximum recording
angle.

8. Signal level indicators

The two LEDs <1> serve as a rough

indication of signal levels; they always
indicate the higher level of the two
channels. The yellow LED can and
should be lit very frequently, but if the
red LED is lit at all it should be seldom
and only quite briefly.

9. Low-cut filter

A 20 Hz high-pass filter with a slope

of 18 dB/octave is active at all times. It
suppresses infrasonic interference, but
is otherwise nearly inaudible in its
effect.

An additional, "soft" low-cut filter

(150 Hz, 6 dB/octave) can be activated
by switching the "FILTER" toggle
switch to the down position, in order
to reduce wind and solid-borne noise
even further, or to compensate for the
bass boost which directional micro-
phones exhibit when used close to
sound sources ("proximity effect"). But
this filter should be used only when
needed since it has a distinctly audible
effect.

position. Now you can turn the unit on.

For ordinary stereo recordings (not

M/S), the cable marked in red should
carry the right channel signal; it should
carry the signal from the "side" (figure-
8) capsule in M/S recording.

6. Setting the preamp gain

When recording, the GAIN control

<2> should be set as high as possible
for the sake of a good signal-to-noise
ratio. It is set correctly if the red LED of
the signal level indicator <1> lights up
only rarely and very briefly during the
loudest passages to be record  ed.
Setting the gain any higher will pose a
danger of overload distortion.

When using the VMS 5 U for dema-

trixing after recording, the GAIN control
should be set to 4 or 10 dB again by
observing the yellow and red LEDs.

Please note:

Phantom power should

be turned off when dematrixing after
recording. Please remove headphones
or turn the headphone volume control
to its lowest setting when turning off
phantom powering.

7. Balance setting

To compensate for a possible differ-

ence in the sensitivity of the micro-
phones, the Balance knob <3> can be
used to adjust the relative gain of the
two channels. When microphones of
equal sensitivity are used, the balance

Содержание VMS 5 U

Страница 1: ...VMS 5 U User s Manual Microphone preamplifier with phantom powering M S matrix and headphone output with special input for Schoeps active Y cable...

Страница 2: ...ts 18 Input for external power supply 19 Input selector switch The connectors and labels on the rear of the VMS 5 U are upside down with respect to the front of the unit This simplifies its use since...

Страница 3: ...3 15 16 19 17 18 8 9 10 11 12 13 14 1 2 3 6 7 4 5...

Страница 4: ...tweight robust all metal housing 1 Inserting batteries The VMS 5 U operates from six AA LR 6 cells included Primary cells preferably alkaline can be used or rechargeables such as NiCd or NiMH To inser...

Страница 5: ...echarge ables should all be of the same type and capacity as one another all batter ies should be changed and or charged together as a set This is to avoid the risk of one or more cells those of lower...

Страница 6: ...neath the limit of proper functioning This avoids overly deep discharge of the batteries which could otherwise lead to chemical leakage or in the case of rechargeable batteries life shortening damage...

Страница 7: ...ble batteries Note the polarity of the DC power connector the positive pole of the power supply must be connected to the center contact of the external powering socket 18 on page 3 The unit will not b...

Страница 8: ...your headphones temporarily 8 Connecting 48 Volt phantom pow ered studio condenser microphones For the highest quality lowest noise recordings use condenser microphones with a sensitivity of at least...

Страница 9: ...ed only when needed since it has a distinctly audible effect position Now you can turn the unit on For ordinary stereo recordings not M S the cable marked in red should carry the right channel signal...

Страница 10: ...ible rejection of hum and radio frequency interference Not all recorders offer balanced inputs but with short cables less than a few meters this is generally not so critical If you need to connect the...

Страница 11: ...cording techniques A B X Y ORTF Blumlein etc two micro phones are used of which one the side or S channel must have a figure 8 directional pattern the other microphone the mid or M chan nel may have a...

Страница 12: ...ll become narrower Any sound sources located beyond that angle near the edges will be picked up out of phase and will seem to jump over to the channel opposite from where they were in reality The opti...

Страница 13: ...eard in a steadily decreasing degree in the left channel output signal But if that sound source crosses past the null in the polar diagram of the left channel virtual microphone see above its presence...

Страница 14: ...1 M MK4 CCM 4 Effect of the WIDTH control on the recording angle for various types of M channel microphones Effect of the WIDTH control on the gain applied to M and S signals S M M M S S 0 1 2 3 4 5 6...

Страница 15: ...find an optimal setting for the stereo image width as it would be reproduced through loudspeakers In addition to experimenting with various width settings it can some times be very useful to equalize...

Страница 16: ...alanced 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 Vrms Recommen...

Страница 17: ...ll blow See page 7 Coaxial socket 5 5 2 1 mm diameter Reverse polarity will not damage the unit though it will not operate If external powering is present any internal bat teries are automatically dis...

Страница 18: ...18 16 Block diagram...

Страница 19: ...19 Frequency response curves above without low cut filter below with low cut filter...

Страница 20: ...0 C to 50 C The headphone volume levels which can be achieved with this unit can with prolonged use cause lasting damage to one s hearing Please monitor only at the minimum necessary levels Cables Use...

Страница 21: ...to misuse e g incorrect operation mechanical damage abuse or acts of God This guarantee is nullified in the event of tampering by unauthorized persons or agencies To secure your rights under this guar...

Страница 22: ...22...

Страница 23: ...23...

Страница 24: ...24 Subject to change without notice 010102...

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