KV2 Audio VHD-Preamp User manual

VHD Preamp
User Guide
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.
WARNING:TO REDUCE THE RISK OF ELECTRIC SHOCK
DO NOTREMOVE THIS PANEL OR ANYATTACHED COMPONENTS.NO OPERATOR SERVICEABLE PARTS INSIDE.REFER SERVICING TO QUALIFIED PERSONNEL ONLY.TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOTEXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
SERIAL NUMBER
AC IN
100 - 240 VAC,50/60 Hz MAX 30WATTS KV2 AUDIO, MANUFACTURED IN THE EUROPEAN UNION, WWW.KV2AUDIO.COM
RIGHT OUTPUT BA/B CONTROL LEFT RIGHT OUTPUT A LEFT RIGHT
RIGHT
LEFT
BAL. INPUTUNBAL. INPUT MIC. INPUTLEFT GAIN
0 +55 dB
+6 dB
48V
ON CLIP
-20dB
MICROPHONE
HIGH PASS BASS LOW MID HIGH MID TREBLE VOLUME
10 Hz 500 Hz
100 Hz
+6 dB +30 dB
LINE
-10dB
CLIP
GAIN BASS TREBLE VOLUME
BAL
UNBAL
INPUT
OUTPUT
SELECT
AB
-6 dB +6 dB
0 dB
-6 dB
0 dB
00
0
-20 dB
+6 dB00 0 dB
-20 dB
-15 dB +15 dB
0
-12 dB +12 dB
0
-12 dB +12 dB
0
-15 dB +15 dB
0
POWER
TECHNOLOGY
VERY HIGH
DEFINITION
PREAMP

VHD Preamp
Safety Instructions
Safety Instructions
2
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 qualications.
WARNING
The equipment is designed in Class I and shall be connected to a wall socket having
protective earthing.
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.
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.

VHD Preamp
Description
Description
3
Block diagram
Basic Description
The VHD Preamplier is a Very high denition, 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 preamplier. The microphone channel features phantom power,
four band equalization and a variable high pass lter.
The VHD Preamplier 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
Rear panel
GAIN
0 +55 dB
+6 dB
48V
ON CLIP
-20dB
MICROPHONE
HIGH PASS BASS LOW MID HIGH MID TREBLE VOLUME
10 Hz 500 Hz
100 Hz
+6 dB +30 dB
LINE
-10dB
CLIP
GAIN BASS TREBLE VOLUME
BAL
UNBAL
INPUT
OUTPUT
SELECT
AB
-6 dB +6 dB
0 dB
-6 dB
0 dB
00 0
-20 dB
+6 dB00 0 dB
-20 dB
-15 dB +15 dB
0
-12 dB +12 dB
0
-12 dB +12 dB
0
-15 dB +15 dB
0
POWER
TECHNOLOGY
VERY HIGH
DEFINITION
PREAMP
WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK
DO NOT REMOVETHIS PANEL OR ANY ATTACHED
COMPONENTS. NO OPERATOR SERVICEABLE PARTS
INSIDE. REFER SERVICINGTO QUALIFIED PERSONNEL
ONLY.TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THISAPPLIANCE TO RAIN OR MOISTURE.
SERIAL NUMBER
AC IN
100 - 240 VAC, 50/60 Hz
MAX 30WATTS KV2 AUDIO, MANUFACTURED IN THE EUROPEAN UNION, WWW.KV2AUDIO.COM
RIGHT OUTPUT BA/B CONTROL LEFT RIGHT OUTPUT A LEFT RIGHT
RIGHT
LEFT
BAL. INPUTUNBAL. INPUT MIC. INPUTLEFT
LEFT
STANDBY
MUTE
LINE DRIVER
OUTPUT B
RIGHTLINE DRIVER
LEFT
STANDBY
MUTE
LINE DRIVER
OUTPUT A
RIGHT
MIC. INPUT PREAMPLIFIER EQUALIZATION
HIGH PASS FITER
HIGH PASS
GAIN
CLIP
CLIP
BASS
BASS
LOWMID
HIMID
TREBLE
TREBLELMID HMID
UNBALANCED INPUT
LINE DRIVER
48 V -20 dB
PREAMPLIFIER
-10 dB
LEFT
RIGHT
MIXER
OUTPUT SELECT
OUT. SEL.
DRIVER
A/B SELECT
INPUT
GAIN
BAL. INPUT
RIGHT
BAL. INPUT
LEFT
EQUALIZATION
BASS
BASS
TREBLE
VOLUME
TREBLELMID HMID
VOLUME
Microphone preamplier Stereo preamplier

System A
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 REDUCETHE RISK OF FIRE OR ELECTRIC SHOCK ,
DO NOT EXPOSE THIS APPLIANCETO RAIN OR MOISTURE.
SERIAL NUMBER
AC IN
100 - 240 VAC, 50/60 Hz
MAX 30WATTS KV2 AUDIO, MANUFACTURED IN THE EUROPEAN UNION, WWW.KV2AUDIO.COM
RIGHT OUTPUT BA/B CONTROL LEFT RIGHT OUTPUT A LEFT RIGHT
RIGHT
LEFT
BAL. INPUTUNBAL. INPUT MIC. INPUTLEFT
VHD Preamp
Using the system
Using the system
4
Demonstration / presentation mixer
Two sound systems comparing
System B
Balanced Input
VHD Preamp Rear view
Stereo player
Unbalanced Input
System B
Narrator's microphone
System A

VHD Preamp
Using the system
Using the system
5
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 REDUCETHE RISK OF FIRE OR ELECTRIC SHOCK ,
DO NOT EXPOSE THIS APPLIANCETO RAIN OR MOISTURE.
SERIAL NUMBER
AC IN
100 - 240 VAC, 50/60 Hz
MAX 30WATTS KV2 AUDIO, MANUFACTURED IN THE EUROPEAN UNION, WWW.KV2AUDIO.COM
RIGHT OUTPUT BA/B CONTROL LEFT RIGHT OUTPUT A LEFT RIGHT
RIGHT
LEFT
BAL. INPUTUNBAL. INPUT MIC. INPUTLEFT
Simple AV mixer-Projector sound and a microphone
Sound system
VHD Preamp Rear view
Stereo
player
Sound system
Input
Narrator's microphone

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 REDUCETHE RISK OF FIRE OR ELECTRIC SHOCK ,
DO NOT EXPOSE THIS APPLIANCETO RAIN OR MOISTURE.
SERIAL NUMBER
AC IN
100 - 240 VAC, 50/60 Hz
MAX 30WATTS KV2 AUDIO, MANUFACTURED IN THE EUROPEAN UNION, WWW.KV2AUDIO.COM
RIGHT OUTPUT BA/B CONTROL LEFT RIGHT OUTPUT A LEFT RIGHT
RIGHT
LEFT
BAL. INPUTUNBAL. INPUT MIC. INPUTLEFT
VHD Preamp
Using the system
Using the system
6
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)
Main system
In
Replacement PA (B) Replacement PA (B)
VHD Preamp Rear view
Stereo
player
Replacement system
In
Narrator's microphone

VHD Preamp - SPECIFICATIONS
Input / Output connectors wiring
XLR Balanced Input and Output connectors
System Acoustic Perfomance
-3dB Response 10Hz ÷ 50kHz
Total Harmonic Distortion <0.0005%
Output Channels
Number of Channels 2
Max. Out
p
ut Volta
g
e 14V / 7V (50Ω) RMS
Max. Output Current 450mA
Signal Input
In
p
ut Channels 5
Input Impedance 2kΩ Mic / 20kΩ Balanced IN / 10kΩ RCA
Mic in
p
ut Phantom
p
ower, -20dB, In
p
ut level
Line input RCA/Balanced, 2 band EQ, -10dB
Signal Output
Out
p
ut channels stereo A / stereo B
Output Impedance 50Ω
Features
Hi
g
h Pass Filter 10Hz ÷500Hz
E
q
ualization 4-band EQ
Power
Power Connector IEC 320
O
p
eratin
g
Volta
g
e Ran
g
e 100÷250V@50÷60Hz
Physical Dimensions
Hei
g
ht 44.5mm (1.75")
Width 483mm (19.0")
Depth 177.8mm (7.0")
Wei
g
ht 2.5k
g
(5.5lbs)
VHD Preamp
Specications
Specications
7
Input Output
12
3
21
3
1 = Ground
2 = Hot (+)
3 = Cold (-)

The future of sound.
Made perfectly clear.
KV2 Audio, Nádražní 936, 399 01 Milevsko, Czech Republic
T [phone] F [phone]
www.kv2audio.com
KVV120031-00-01-0
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.