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SCHOEPS
VMS
5 U & VSR 5 U
MICROPHONE PREAMPLIFIERS WITH
M-S MATRIX |
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| VMS
5 U MICROPHONE PREAMPLIFIER WITH
M-S MATRIX |
FEATURES:
- 48V phantom power
- Also for Schoeps' active
"Y" cable
- Switchable, variable M-S
matrix
- Switchable phones output
(before or after M-S matrix)
- Operates on internal batteries
or an external AC adapter
- Specially designed power
management system with protection against leakage due to deep-draining
of batteries
- High-quality, long-life
switches and sockets (gold-plated contacts)
- Robust aluminium housing
(W x H x D: 169 mm x 60 mm x 163 mm)
- A compact M-S microphone
assembly is available, with windscreen (WSR MS)
The VMS 5 U is
a high-quality microphone preamplifier with phantom powering, a M-S
matrix and a switchable headphone output, all in a robust metal case.
It permits the use of normal microphones such as the Schoeps CMC series,
as well as the Schoeps active "Y"-cable with Colette microphone
capsules. The VMS 5 U can be powered by internal or external batteries
(including rechargeable types) or an external AC adapter. It can readily
be powered along with other units from a common supply. Switches and
sockets are of high quality (e.g., gold-plated contacts), thus ensuring
long, trouble-free operation. |
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VMS 5 U |
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| INPUTS:
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| Switchable
between two XLR-3F sockets and a special 5-pin Binder input for
the Schoeps KCY active "Y" cable. XLR inputs are balanced
and transformerless; the 48-Volt phantom powering can be switched
off (for subsequent post-production M-S dematrixing). |
| Input impedance:
|
20 kOhm
|
| Recommended
minimum sensitivity of microphones at XLR inputs: |
8 mV/Pa
|
| Maximum
input level (20 dB gain setting) for < 0.5% THD: |
-2.2 dBV
(780 mV rms) |
| Preamplifier
gain settings: |
4, 10,
20, 30 or 40 dB |
| Performance
specifications of VMS 5 U with Schoeps CMC 64 (cardioid):
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| Equivalent
noise level: |
17 dB (A-weighted),
27 dB (CCIR, qps) |
Maximum
sound pressure level:
at 4 or 10 dB gain:
at 20 dB gain:
at 30 dB gain:
at 40 dB gain: |
132
dB, limited by microphone
130 dB
120 dB
109 dB |
| Peak level
indicators: |
-20 dB,
-3 dB |
| The "Balance"
potentiometer permits compensation for differences in microphone
sensitivity. A polarity inversion switch permits the rapid exchange
of L-R channel assignments in M-S recording. |
|
OUTPUTS: |
| The outputs
are balanced and transformerless, and are switchable between the
amplified microphone signals and the decoded M-S stereo signals.
|
| Output impedance:
|
100 Ohms
|
| Maximum
output level for 0.5% THD: |
17 dBV
(7 Vrms) |
| Recommended
load impedance: |
2 kOhm
or greater |
|
HEADPHONE OUTPUT: |
| Switchable;
for monitoring either the amplified microphone signals ("PREAMP"
= left/right for A/B or X/Y recordings) or ("MATRIX" = mid/side
decoding for M-S stereo inputs). |
| Headphone
impedance: |
32 - 2,000
Ohms |
| Headphone
socket: |
1/4" stereo
phone jack |
|
FILTERS: |
| An infrasonic
filter (20 Hz, 18 dB/oct.) is permanently active. In addition, a
low-frequency rolloff (150 Hz, 6 dB/oct.) can be switched in. |
|
POWERING: |
| An internal
filter/regulator circuit permits a wide range of input voltages.
|
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OPERATION WITH INTERNAL BATTERIES (including rechargeable types):
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| Number and
type of cells: |
6x AA
|
| Recommended
battery type: |
Alkaline
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| Recommended
rechargeable type: |
NiMH |
| A user-replaceable
fuse protects against accidentally reversing 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. 5.5 hours (1300 mAh NiMH) |
| A voltage
indicator displays the battery voltage during operation. A warning
LED will begin to blink if the voltage falls below a critical value
(time remaining at that point: at least 10 minutes with rechargeable
batteries). The unit will shut itself off automatically to help
prevent damage resulting from completely draining the batteries.
With rechargeable batteries, this reduces the risk of any individual
cells inverting their polarity. The unit can be brought back into
operation by turning the "Power" switch off and on again. |
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EXTERNAL POWERING: |
| Coaxial
socket, 5.5 mm x 2.1 mm |
| Reverse
polarity will not damage the unit, athough it will not operate.
If external powering is present, the batteries are automatically
disconnected (indicated by yellow LED "EXT."). This protects the
batteries from being drained or loaded unintentionally. The battery
voltage indicator displays the level of any external powering. |
| The unit
can be operated with an unfiltered DC voltage from 6 V (500 mA)
up to 15 V (250 mA) at the external supply input socket or 10-13
VAC. |
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PARALLEL OPERATION: |
| Parallel
operation for a VMS 5 U from a single power supply, along with one
or more other pieces of equipment, is generally possible because
of the internal galvanic isolation by the regulator.
The design of the rear panel is deliberately labeled "upside down"
to allow the unit to be connected or disconnected without turning
it around while in use. |
| Robust,
black metal case; designed for portable use. |
| Dimensions:
|
W x H x
D: 169 mm x 60 mm x 172 mm
(approximately 6-5/8" x 2-3/8" x 6-3/4") |
| Weight:
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1.2 kg (approximately
2 lb 10 oz) |
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Price: VMS 5 U $2,425.00 |
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| VSR
5 U MICROPHONE PREAMPLIFIER |
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Analog Reference Microphone Preamplifier – low noise and distortion, RF protected
SCHOEPS now introduces the VSR 5, a top-class studio microphone preamplifier. It excels with its wide dynamic range, extremely low distortion, and comprehensive protection from radio frequency interference.
The VSR 5 is SCHOEPS’ first 19" rackmount unit, conceived specifically for use in the studio. For a number of years its circuit has been our in-house reference for testing microphones, so it seemed only logical to make it available to our customers as well.
Amplifier modules
Two amplifier modules (Core SVM) form the heart of the VSR 5. They were inspired by the legendary ”TransAmp LZ” modules from Valley People, long recognized for being especially low-noise.
RF Filters
Professional audio equipment today must be adequately protected from electromagnetic inter ference emanating from cell phones and other mobile communication devices with frequencies up to 2 GHz and higher, as well as radio and TV transmitters. The VSR 5 shows that this protection need not come at the expense of excellent audio quality. The extensive RF filtering does not limit the preamplifier's bandwidth, its common-mode rejection or its freedom from distortion. This is possible because of the use of special, modern circuit components and a well-thought-out circuit design. |
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Functions |
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High-quality components |
The operating controls of the VSR 5 have been deliberately
limited to essentials:
- a highly precise, repeatable rotary gain control ranging
from 0 to 60 dB in 3 dB steps
- a wide-range, fast-responding array of LED level indicators
covering -48 dBr through +9 dBr, with a ”Clip” LED at +20 dBr
- switchable phantom powering. The VSR 5 recognizes
automatically when a condenser microphone has been
connected; the LED of the "P48" switch glows yellow
when powering is enabled and green when a condenser
microphone is connected.
- a polarity reversal switch
- a ”Mute” switch. Muting occurs automatically during
turn-on and turn-off of the preamp, and also of the phantom
powering circuit.
- a switchable second-order low-cut filter for suppressing
pop and wind noise or infrasonic disturbances. The cutoff
frequency can be set to 40, 80 or 120 Hz so as to remove
as little as possible from the desired signal.
- two separate, independent low-impedance, active balanced
(symmetrical) floating outputs per channel
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The VSR 5 is distinguished by the high quality of
its components. In particular:
- an especially low-noise, low-distortion gain
module with superior common-mode rejection
- high-quality filters that protect both the inputs
and outputs from radio-frequency interference without any
adverse effect on the sound quality
- a high-quality rotary gain control with repeatable settings in
3 dB steps
- a robust stainless-steel housing that shields the circuitry
from external interference
- gold-plated contacts on the XLR connectors and the rotary
gain control for long-life, noise-free operation
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Specifications |
* according to IEC 61938
** common-mode rejection ratio
*** according to IEC 61672-1
****according to IEC 60268-1 |
| Inputs: 2, electronically balanced and floating |
| Phantom powering: +48 VDC (P 48*); can be switched off |
| Resistances: 2 × 6.85 kOhms |
| Maximum current: 10 mA (according to standards) |
| Minimum current at which LEDs indicate a microphone at an input: 1.7 mA |
| Input impedance: 8 kOhms |
| Input CMRR** at 60 dB gain: > 90 dB at 1 kHz (for typical values see Fig. 1) / > 80 dB at 15 kHz |
| Max. input level: 25.4 dBu (23.2 dBV) at 0 dB gain, f = 1 kHz |
| Gain adjustment: 0 dB ... 60 dB in steps of 3 dB |
| Gain accuracy: ±0.3 dB |
| Low cut filters (-3 dB): 40 Hz, 80 Hz, 120 Hz at 12 dB/oct.
or ”off” (see Fig. 2) |
| THD+N at 1 kHz: 0.0006% at 30 dB gain and 27.5 dBu output
level (1 dB below clipping) into 100 kOhm
load (see Fig. 3) |
| Noise (input terminated with 200 Ohms; gain: 60 dB, referred to input):
-127.8 dBu (-130.0 dBV), unweighted, RMS
-130.6 dBu (-132.8 dBV), A, RMS***
-117.4 dBu (-119.6 dBV), CCIR-1k, Q-peak**** |
| Frequency range (gain: 30 dB): 12 Hz ... 90 kHz (±0.1 dB) /
2.5 Hz ... 400 kHz (-3 dB) |
| Inter-channel phase difference: 0.0° at 5 Hz /
0.0° at 50 Hz /
0.0° at 1 kHz /
0.0° at 10 kHz /
+0.20° at 200 kHz |
| Slew rate of the ”Core SVM”: 10 V/µs at 30 dB gain |
| RF filter range (in- and outputs): 3 MHz – 1 GHz, see Fig. 4 |
| Max. output level: 28.5 dBu (26.3 dBV) |
| Max. output level: 28.5 dBu (26.3 dBV) |
| Output impedance: 50 Ohms |
| Output CMRR*: ca. 60 dB (20 Hz – 20 kHz) |
| Meter range: -48 dBr ... +9 dBr (adjustable) /
clipping LED lights up at +15 dBr |
| Power supply: 94 ... 125 VAC / 185 ... 250 VAC, 50 – 60 Hz |
| Power consumption: 10 VA |
| Dimensions (19", 2U): 485 mm (w) × 60 mm (h) × 195 mm (d) |
| Weight: 4.70 kg, 10.34 lbs |
| Case: stainless steel, aluminum |
| Front: gray Nextel finish; front panels: stainless steel |
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Model |
Description |
Price |
VSR5 |
Two "Schoeps Core SVM" Amplifier Modules with balanced, electronically
floating Inputs, +48 VDC phantom power (switchable), 0 to 60 dB rotary gain
controls in 3 db steps, State-of-the-Art RF Filters, 2 x 2 electronically floating
balanced outputs, Mains Supply 115/230 VAC, 19" Rackmount - 2U, 10.34 lbs. |
$3,499.00* |
* Pricing Note: Current pricing reflects an early purchase price, and is likely to change |
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