VHD Preamp
User Guide
POWER
AB
OUTPUT
PREAMP
VERY HIGH
DEFINITION
SELECT
0
-20 dB
00
+6 dB00 0 dB
0 dB
-6 dB
LINE
0 dB
-6 dB +6 dB
GAIN BASS TREBLE VOLUME
+6 dB +30 dB
-10dB
INPUT
BAL
CLIP
UNBAL
-20 dB
0
-15 dB +15 dB
0
-12 dB +12 dB
0
-12 dB +12 dB
0
MICROPHONE
-15 dB +15 dB
100 Hz
HIGH PASS BASS LOW MID HIGH MID TREBLE VOLUME
10 Hz 500 Hz
GAIN
+6 dB
0 +55 dB
-20dB
TECHNOLOGY
ON CLIP
48V
The future of sound.
Made perfectly clear.
At KV2 Audio our vision is to constantly develop
technologies that eliminate distortion and
loss of information providing a true dynamic
representation of the source.
Our aim is to create audio products that absorb
you, place you within the performance and deliver
a listening experience beyond expectation.
BAL. INPUTUNBAL. INPUT MIC. INPUTLEFT
LEFT
RIGHT
OUTPUT BA/B CONTROL LEFT RIGHT OUTPUT A LEFT RIGHT
KV2 AUDIO, MANUFACTURED IN THE EUROPEAN UNION, WWW.KV2AUDIO.COM
RIGHT
SERIAL NUMBER
WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK
DO NOT REMOVE THIS PANEL OR ANY ATTACHED
COMPONENTS. NO OPERATOR SERVICEABLE PARTS
INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL
ONLY. TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
AC IN
100 - 240 VAC, 50/60 Hz
MAX 30WATTS
Safety Instructions
IMPORTANT SAFETY INSTRUCTIONS
Observe all instructions and follow warnings marked on the equipment and in the user’s manual.
Connect the equipment only to a source of proper mains voltage.
Do not attempt to switch on any equipment that has been dropped, that is damaged, or has
had liquid penetration, or if malfunctions have occurred and their nature requires a repair action. The
supply cable shall be made by a person having proper qualications.
WARNING
The equipment is designed in Class I and shall be connected to a wall socket having
protective earthing.
VHD Preamp
The mains plug and supply cable shall remain easy accessible, as this is used for disconnection of the
equipment from the supply source if necessary.
Never interrupt earthing due to safety reasons.
Do not place the equipment close to heating bodies or other sources of heat and protect it against
direct sunlight.
The equipment must not come into contact with open ames.
Ventilation of the equipment must not be obstructed by covering of ventilation openings.
The equipment must not be exposed to dripping or splashing liquid or water and excessive humidity.
Any object lled with any liquid shall not be placed on the equipment.
Safety Instructions
The triangle with a symbol of a lightning marks parts of the equipment under
life jeopardizing voltage, whose values may cause an injury from electric
shock.
The symbol indicating that the equipment is manufactured in compliance
with EU standards.
The triangle with a symbol of an exclamation mark in the text marks
important instructions for operation, setting and maintenance.
2
Description
Basic Description
The VHD Preamplier is a Very high denition, small stand-alone microphone and stereo inputs signal
mixer.
Primarily built for high quality, easy presentation and comparisons of two individual systems using the
same source, the applications for this mixer are comprehensive and extremely useful.
The VHD Preamp features a stereo pair of balanced line inputs, stereo RCA phono connectors, and a
very high quality VHD microphone preamplier. The microphone channel features phantom power,
four band equalization and a variable high pass lter.
The VHD Preamplier also features two switchable A or B outputs, to allow a simple comparison of
systems between the two outputs. Both A and B outputs have line drivers built into them to maintain
audio signal integrity over long cable lengths.
Front panel
Microphone preamplier Stereo preamplier
VHD Preamp
TECHNOLOGY
48V
ON CLIP
Rear panel
AC IN
100 - 240 VAC, 50/60 Hz
MAX 30WATTS
Block diagram
MIC. INPUT
PREAMPLIFIER
GAIN
+6 dB
-20dB
0 +55 dB
SERIAL NUMBER
WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK
DO NOT REMOVE THIS PANEL OR ANY ATTACHED
COMPONENTS. NO OPERATOR SERVICEABLE PARTS
INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL
ONLY. TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
CLIP
HIGH PASS BASS LOW MID HIGH MID TREBLE VOLUME
100 Hz
10 Hz 500 Hz
-15 dB +15 dB
HIGH PASS FITER
0
MICROPHONE
0
-12 dB +12 dB
-12 dB +12 dB
RIGHT
OUTPUT BA/B CONTROL LEFT RIGHT OUTPUT A LEFT RIGHT
KV2 AUDIO, MANUFACTURED IN THE EUROPEAN UNION, WWW.KV2AUDIO.COM
EQUALIZATION
BASS
0
0
-15 dB +15 dB
TREBLELMID HMID
-20 dB
UNBAL
GAIN BASS TREBLE VOLUME
0 dB
INPUT
BAL
-10dB
CLIP
+6 dB +30 dB
-6 dB +6 dB
0 dB
-6 dB
00
LINE
RIGHT
+6 dB00 0 dB
LEFT
-20 dB
0
BAL. INPUTUNBAL. INPUT MIC. INPUTLEFT
LINE DRIVER
VERY HIGH
DEFINITION
PREAMP
SELECT
OUTPUT
POWER
AB
RIGHT
48 V
-20 dB
UNBALANCED INPUT
RIGHT
LEFT
BAL. INPUT
RIGHT
BAL. INPUT
LEFT
INPUT
GAIN
PREAMPLIFIER
-10 dB
CLIP
GAIN
HIGH PASS
BASS
LOWMID
EQUALIZATION
BASS
BASS
TREBLELMID HMID
TREBLE
HIMID
VOLUME
TREBLE
VOLUME
A/B SELECT
MIXER
OUT. SEL.
DRIVER
OUTPUT SELECT
LINE DRIVER
LINE DRIVER
STANDBY
MUTE
STANDBY
MUTE
OUTPUT A
LEFT
RIGHTLINE DRIVER
OUTPUT B
LEFT
Description
3
Using the system
Demonstration / presentation mixer
Two sound systems comparing
System B
VHD Preamp
System A
VHD Preamp Rear view
AC IN
100 - 240 VAC, 50/60 Hz
MAX 30WATTS
Using the system
SERIAL NUMBER
WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK
DO NOT REMOVE THIS PANEL OR ANY ATTACHED
COMPONENTS. NO OPERATOR SERVICEABLE PARTS
INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL
ONLY. TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
System B
RIGHT
Stereo player
Unbalanced Input
System A
OUTPUT BA/B CONTROL LEFT RIGHT OUTPUT A LEFT RIGHT
RIGHT
KV2 AUDIO, MANUFACTURED IN THE EUROPEAN UNION, WWW.KV2AUDIO.COM
LEFT
Balanced Input
Narrator's microphone
BAL. INPUTUNBAL. INPUT MIC. INPUTLEFT
4
Using the system
Simple AV mixer-Projector sound and a microphone
Sound system
VHD Preamp
Sound system
Input
VHD Preamp Rear view
AC IN
100 - 240 VAC, 50/60 Hz
MAX 30WATTS
SERIAL NUMBER
WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK
DO NOT REMOVE THIS PANEL OR ANY ATTACHED
COMPONENTS. NO OPERATOR SERVICEABLE PARTS
INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL
ONLY. TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
Stereo
player
RIGHT
OUTPUT BA/B CONTROL LEFT RIGHT OUTPUT A LEFT RIGHT
RIGHT
KV2 AUDIO, MANUFACTURED IN THE EUROPEAN UNION, WWW.KV2AUDIO.COM
LEFT
BAL. INPUTUNBAL. INPUT MIC. INPUTLEFT
Narrator's microphone
Using the system
5
Using the system
Replacement FOH mixer
Replacement mixer for FOH when the main system is being taken down after a concert. Many venues
now insist that at least one pair of speakers and a mixer/mic is kept available during breakdown.
Main system - PA (A) Main system - PA (A)
VHD Preamp
Replacement PA (B) Replacement PA (B)
VHD Preamp Rear view
AC IN
100 - 240 VAC, 50/60 Hz
MAX 30WATTS
Using the system
SERIAL NUMBER
WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK
DO NOT REMOVE THIS PANEL OR ANY ATTACHED
COMPONENTS. NO OPERATOR SERVICEABLE PARTS
INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL
ONLY. TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
Replacement system
In
Main system
In
RIGHT
OUTPUT BA/B CONTROL LEFT RIGHT OUTPUT A LEFT RIGHT
RIGHT
KV2 AUDIO, MANUFACTURED IN THE EUROPEAN UNION, WWW.KV2AUDIO.COM
LEFT
Stereo
player
BAL. INPUTUNBAL. INPUT MIC. INPUTLEFT
Narrator's microphone
6
p
p
p
p
g
q
p
g
g
Specications
VHD Preamp - SPECIFICATIONS
System Acoustic Perfomance
-3dB Response 10Hz ÷ 50kHz
Total Harmonic Distortion <0.0005%
Output Channels
Number of Channels 2
Max. Out
Max. Output Current 450mA
ut Voltage 14V / 7V (50Ω) RMS
Signal Input
ut Channels 5
In
Input Impedance 2kΩ Mic / 20kΩ Balanced IN / 10kΩ RCA
Mic in
Line input RCA/Balanced, 2 band EQ, -10dB
Signal Output
Out
Output Impedance 50Ω
Features
Hi
E
Power
Power Connector IEC 320
O
Physical Dimensions
Hei
Width 483mm (19.0")
Depth 177.8mm (7.0")
Wei
ut Phantom power, -20dB, Input level
ut channels stereo A / stereo B
h Pass Filter 10Hz ÷ 500Hz
ualization 4-band EQ
erating Voltage Range 100÷250V@50÷60Hz
ht 44.5mm (1.75")
ht 2.5kg (5.5lbs)
VHD Preamp
Input / Output connectors wiring
XLR Balanced Input and Output connectors
Input Output
1 = Ground
12
3
21
3
2 = Hot (+)
Specications
3 = Cold (-)
7
The future of sound.
Made perfectly clear.
At KV2 Audio our vision is to constantly develop
technologies that eliminate distortion and
loss of information providing a true dynamic
representation of the source.
Our aim is to create audio products that absorb
you, place you within the performance and deliver
a listening experience beyond expectation.
KV2 Audio, Nádražní 936, 399 01 Milevsko, Czech Republic
T +44(0)1423 816868 F +44(0)1423 816869
www.kv2audio.com
KVV120031-00-01-0
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