USER MANUAL
HA4V-R
Version 1.0
HA4V-R User Manual v.1.0
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Warranty
HA4V-R is covered by 24 month warranty on its electronics parts, starting from the date of
purchase. This warranty becomes void in case of tampering with the device and in case of
work carried out on it by people that were not authorized by the manufacturer or by an
authorized dealer. Warranty conditions are those described in the “Warranty Rules”.
NOTE - responsibility of the purchaser: in case of repair under warranty, the device must be
packed in order to avoid damage during transport and shipped to the manufacturer together
with all the accessories.
Warranty Rules.
1. In order to exercise his warranty rights, the purchaser must include with the device a copy
of the evidence of purchase duly stamped by the dealer (bill/invoice).
2. The warranty lasts 24 months on the electronic parts. The warranty is granted at the point
of sale or it could be directly requested to the manufacturer.
3. The warranty only covers damage to the product which makes it work badly.
4. Work under warranty will only mean repairing or replacing, free of charge, any parts
acknowledged being defective during manufacture or in their material, including labour
costs.
5. The warranty does not apply to damage caused by negligence or failure to comply with the
instructions, or damage caused by unauthorised people, with a special reference to the
external parts.
6. Also, the warranty does not apply to damage caused to the device by connection to
unsuitable power sources.
7. The warranty does not cover parts that are subject to wear as a consequence of the use,
as well as the chassis if the material is not defective.
8. The warranty does not include transport costs, which will be paid by the purchaser
depending on way and time of transport.
9. The warranty expires 24 months after the purchase. In this case, service will be provided
charging for the replaced parts, labour costs and transport according to the current rates.
10. In case of any controversy the Court of Law of Venice has the exclusive jurisdiction.
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SUMMARY
1. Installation
1.1 Introduction
1.2 Contents of the HA4V-R
1.3 Safety rules
2. Overview
2.1 Rear panel overview
2.2 Front panel overview
2.3 Amplifier configurations general overview
3. Connections and configurations
3.1 Remote volume control – VCA
3.2 CH1 Sum
3.3 Input signal sensitivity
3.4 Ground-lift
4. Specifications
4.1 Technical features
4.2 Mechanical dimensions
4.3 Block diagram
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1
Installation
1.1 Introduction
The headphone amplifier HA4V-R was designed to provide absolute stability and reliability,
allowing the use with most headphones on the market with any impedance.
Thanks to the high voltage circuitry of the power stages, the HA4V-R can even drive high
impedance headphones up to 600 ohms, keeping the distortion at very low levels even with a
high power output.
1.2 Contents of the HA4V-R
Contents of the HA4V-R kit:
- n° 1 HA4V-R device
- n° 1 user manual
- n° 1 power supply cable
1.3 Safety rules
Read carefully the following warnings to keep your and others safety, for the right use of the
device and to avoid warranty invalidation.
1. Do not expose the device to rain or high humidity. Protect the device from accidental liquid
penetration, if it happens, stop using the device and apply to qualified or authorized
personnel.
2. Do not insert things into the device through the openings to avoid risk of fire or electric
shock.
3. Before connect the amplifier, ALWAYS verify the ground connection as requested by the
law.
4. Disconnect the device from the light socket before make any operation for the internal
device configuration.
5. If the original power cord is waste or deteriorate, replace it with a similar one.
6. Disconnect the device from the light socket before make cleaning operations. Clean the
device with a dry and soft cloth. Do not use liquids or spray that can contain flammable
elements.
7. Device handling must take place only when all the cables have been disconnected.
8. Device maintenance must be done only by qualified personnel.
9. For any requirement or technical information contact InOut or authorized personnel.
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OBSOLETE DEVICES DISPOSAL
• This picture means that the device is European Directive 2002/96/EC
compliant.
• All electronic and electric devices should be disposed separately from the
normal garbage, by specific gathering plants designated by the government or
by local authorities.
• Correct disposal of obsolete devices, of the accessories and especially of the
batteries, contribute to prevent possible negative consequences on human
health and on the environment.
• For detailed information on obsolete devices disposal, contact the
municipality, the garbage disposal service or the store where you bought the
device.
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2
Overview
2.1 Rear panel overview
1) AC mains power connector, use the appropriate supplied cable.
2) Protection fuse on mains power
3) Mains power switch
4) Activity mode switch:
• To enable the external volume adjustment (VCA) for each channel.
• To reverse the VCA
• To switch the input channels 2-3-4 with the same audio input of channel 1.
5) CH 1-2-3-4 unbalanced stereo input connectors
6) External volume adjustment potentiometers connector (VCA)
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2.2 Front panel description
1) Headphones stereo jack connectors
2) “Device ON” LED, powered device.
3) Two-colour LED with indication purpose:
LED Description Indicating
off = input signal not present or too low
green = input signal present SIGNAL
red = input signal too high PEAK
Yellow
(POWER ON)
= When blinking indicates that the input
channels 2-3-4 are switched on the
channel 1 signal input
CH1 SUM
4) Channels 1-2-3-4 volume adjustment knobs
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2.3 Power amp configurations general overview
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3
Connections and configurations
3.1 Volume remote control - VCA
There is one connector for each single channel on the amplifier back, where connect a
potentiometer to allow volume remote control.
To enable the remote control, set the ACTIVITY MODE switch to ON.
WARNING: This mode disables the front volume controls.
VOLUME REMOTE CONTROL
20 / 50 KΩ
LINEAR POT.
VOLUME REMOTE CONTROL CONFIGURATION
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VOLUME REMOTE CONTROL CONFIGURATION
JUMPER VCA MUTE
NORMAL 0-10V
(DEFAULT)
REVERSE 10-0V
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3.2 CH1 SUM
On the back of the Amplifier there’s a switch that allows you to switch the input 1 signal to the
other channels to avoid additional external links.
To enable CH1 SUM set the ACTIVITY MODE switch to ON for each single channel.
INDEPENDENT CHANNELS INPUT SIGNAL
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SWITCHING INPUT 1 SIGNAL TO CHANNEL 2
SWITCHING INPUT 1 SIGNAL TO CHANNELS 2 - 3 - 4
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3.3 Input sensitivity
The amplifier has a circuit inside that allows selecting a different sensitivity for the audio
signal incoming to accept low output signal sources.
To enable a different sensitivity remove the cover and set the jumpers as shown in the
following picture.
IMPORTANT: use both jumpers for each channel.
INPUT SIGNAL SENSITIVITY SETTING
W I T H O U T J UM P E R = -5,7dBu
WITH JUMPER =+3,8dBu
(DEFAULT)
CH1 = JP1 – JP2
CH2 = JP3 – JP4
CH3 = JP5 – JP6
CH4 = JP7 – JP8
3.4 GROUND-LIFT
If there is low frequencies noise on the speakers due to ground loops, it’s advisable to set JP9
jumper to OPEN position; that means to split audio ground from chassis ground.
GROUND LIFT CONFIGURATION
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4
Specifications
4. 1 Technical features
Mains power……………………..… : 230 Vac / 50Hz or 115 Vac / 60 Hz
Consumption (during standby)….. : 1 W
Mains protection………………..…. : 2,50A retard fuse (3,15A retard fuse for 115Vac )
Maximum Output Level…………... : 60 mW
(@ 32 ohm load ) 1kHz THD+N= 1%
: 130 mW (@ 600 ohm load ) 1kHz THD+N= 1%
Frequency response…………..….. : 20 ~ 20.000 Hz (±0,1dB)
Signal to noise ratio……………..... : 95dB.
Harmonic distortion……………..... : < 0,1%
RMS Level / Gain………...……….. : 1,9 Vrms / +5,5 dBm
(@ 32 ohm load )
: 10,5 Vrms / +20,5 dBm
(@ 600 ohm load )
Input impedance………………..…. : 10 Kohms Unbalanced
Input sensitivity………………….... : +3,8dbu (1,2v) e –5,7dbu (400mV)
Classification………………..…….. : IP 30 in the strength of liquid and powders permeation.
Dimensions………………..………. : 216x158x44mm.
Weight……………………………… : 1.5 Kg.
CEE directive compliant:
Safety……………..…………..….. : 2006/95/CEE
Electromagnetic compatibility..... : 2004/108/CEE
Applied standards:
Safety : EN 60065
Safety limitation for electronic devices and their accessorie
s
connected to the house power grid and analogous general use.
Electromagnetic compatibility
for audio devices:
- Emissions - Harmonics
- Voltage fluctuations
- Radio interferences
: EN 61000-3-2
: EN 61000-3-3
: EN 55013
: EN 55022
- Immunity
: EN 55020
: EN 55024
Manufactured by:
Noventa di Piave (VE) - ITALY
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4.2 Mechanical dimensions
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4.3 Block diagram
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