Vision AV-1700 User manual

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AV-1700+ DIGITAL AMPLIFIER
OWNERS MANUAL
www.visionaudiovisual.com/techaudio/av-1700plus

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DECLARATION OF CONFORMITY
Where applicable Vision products are certified and comply with all known local regulations to a
„CB Certification‟ standard. Vision commits to ensure all products are fully compliant with all
applicable certification standards for sale in the EU and other participating countries.
The product described in this owner manual is in compliance with RoHS (EU directive
2002/95/EC), and WEEE (EU directive 2002/96/EC) standards. This product should be returned
to the place of purchase at the end of its useful life for recycling.
WARNINGS
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER (OR
BACK). NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED
SERVICE PERSONNEL.
The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the
user to the presence of uninsulated “dangerous voltage” within the product‟s enclosure that may be
of sufficient magnitude to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle, is intended to alert the user to the presence of
important operating and maintenance (servicing) instructions in the literature accompanying the
appliance.
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE
THIS APPLIANCE TO RAIN OR MOISTURE.
All products are designed and imported into the EU by „Vision‟ who is wholly owned by „Azlan
Logistics Ltd.‟, Registered in England Nr. 04625566 at Lion House, 4 Pioneer Business Park,
Clifton Moor, York, YO30 4GH. WEEE Registration: GD0046SY
DECLARATION OF ORIGIN
All Vision products are made in the People‟s Republic of China (PRC).

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USE ONLY DOMESTIC AC OUTLETS
Connecting the unit to an outlet supplying a higher voltage may create a fire hazard.
HANDLE THE POWER CORD WITH CARE
Do not disconnect the plug from the AC outlet by pulling the cord; always pull the plug itself.
Pulling the cord may damage it. If you do not intend to use your unit for any considerable
length of time, unplug the unit. Do not place furniture or other heavy objects on the cord, and
try to avoid dropping heavy objects on it. Do not tie a knot in the power cord. Not only could
the cord be damaged, but a short circuit could also be caused with a consequent fire hazard.
PLACE OF INSTALLATION
Avoid installing this product under the following conditions:
• Moist or humid places
• Places exposed to direct sunlight or close to heating equipment
• Extremely cold locations
• Places subject to excessive vibration or dust
• Poorly ventilated places
Do not expose this product to dripping or splashing. DO NOT PLACE OBJECTS FILLED WITH
LIQUIDS ON OR NEAR THIS PRODUCT!
MOVING THE UNIT
Before moving the unit, be sure to pull out the power cord from the AC outlet and disconnect
the interconnection cords with other units.
WARNING SIGNS
If you detect an abnormal smell or smoke, turn this product off immediately and unplug the
power cord. Contact your reseller or Vision.
PACKAGING
Save all packing material. It is essential for shipping in the event the unit ever needs repair.
IF ORIGINAL PACKAGING IS NOT USED TO RETURN THE UNIT TO THE SERVICE CENTRE,
DAMAGE IN TRANSIT WILL NOT BE COVERED BY WARRANTY.
WATTS
The most consistent standards for measuring watts are “Program Power” and “RMS” because
these measure average sustained levels.
Amplifier power output changes depending on how many loudspeakers are connected.
Professional manufacturers typically quote output based on 8 ohms. Less reputable
manufacturers quote at 4 ohms to make their product seem more powerful.
This amplifier has an output of:
2 x 100w (sometimes referred to as 200w) @ 8 ohms (two loudspeakers connected)
2 x 200w (sometimes referred to as 400w) @ 4 ohms (four loudspeakers connected)

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FRONT AND REAR PANELS
1. IR Receiver
2. Active Input LED
3. Line-level Input 4 (3.5mm Minijack - duplicated on rear panel)
4. Line-level Input Volume [Push: Input Select]
5. Microphone Input Gain [Push: On/Off]
1. Microphone Input (Balanced XLR)
2. Line-level Inputs 1-3 (2-Phono)
3. Line-level Input 4 (3.5mm Minijack -duplicated on front panel)
4. Line-Level Output (2-Phono)
5. Loudspeaker Outputs
6. RS-232 Control Input
7. Fuse
8. Figure-8 (C8) Power Input
1
3
4
5
2
1
2
3
4
6
8
7
5

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REMOTE CONTROL
1. Power On and Off
2. Input Selection
3. Tone Reset
4. Mute
5. Tone Control
6. Microphone Input Gain
7. Line-level Input Volume
1
2
3
4
5
6
7

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INSTALLATION
1. CONNECT INPUTS AND OUTPUTS Up to two pairs of loudspeakers can be connected. If
speaker cable provided is not long enough use unshielded speaker cable with gauge of
0.75mm or higher.
NOTE 1: The warranty will be void if you use shielded cable
NOTE 2: This is a low-impedance digital amplifier. Do not connect „100v line‟speakers
(normally any speakers with “t” in their part code)
2. CONNECT POWER The amplifier will turn on when power is plugged in the first time.
3. TURN POWER ON Then select input and adjust volume as required.
Should it become overloaded it will shut down to protect itself. Return operating conditions to
safe levels and restart amplifier.
MICROPHONE INPUT
1. The microphone input provides “Phantom Power” (24v) for condenser microphones such as
lectern or boundary (PZM) microphones.
NOTE: Ensure the microphone volume is turned down when connecting microphones.
2. The microphone volume can be adjusted independently of the line-level inputs.
3. Keep microphone away from loudspeakers to avoid feedback.

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RS-232 CODES
Table 1: Control Codes
HEX
Codes
On Remote
Function
A5 11 11
ON
Bring out of standby
A5 15 15
OFF
Put into standby
A5 05 05
MUTE
Mute on/off (Standby activates after 30 minutes of mute)
A5 01 01
INPUT1
Input select 1
A5 09 09
INPUT2
Input select 2
A5 10 10
INPUT3
Input select 3
A5 02 02
INPUT4
Input select 4
A5 08 08
TREBLE+
Increase treble gain by +1dB
A5 0D 0D
TREBLE-
Decrease treble gain by -1dB
A5 0C 0C
BASS+
Increase bass gain by +1dB
A5 12 12
BASS-
Decrease bass gain by -1Db
A5 00 00
RESET
Reset tone
A5 07 07
MIC+
Mic volume + (also cancels mute if active)
A5 0B 0B
MIC-
Mic volume - (also cancels mute if active)
A5 06 06
VOL+
Volume + (also cancels mute if active)
A5 04 04
VOL-
Volume - (also cancels mute if active)
A command is structured of A5 then the command twice e.g. turn on: send A5 then send 11
twice.
Each part of the code is preceded by “0x” so the longhand is 0x65 0x11 0x11

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Table 2: Return Codes
To request status send A5 65 65. The status of all functions will be replied.
Hex Codes
Function
Range
Remark
working
off
standby
MUTE
Mute status
0
1
0
1
1
BD3490FV_SELECT
Input select
0
3
0= input 1, 1=input2,
2=input3, 3= input4
BD3490FV_GAIN_GET
Get master volume
1
28(1C)
1~28, volume has 28
steps
BD3490FV_B_GAIN_GET
Get bass gain
1
15(0F)
Bass gain has 15 steps
BD3490FV_T_GAIN_GET
Get treble gain
1
15(0F)
Treble gain has 15 steps
PT2259_GAIN_GET
Get mic gain
1
28(1C)
Mic gain has 28 steps
Baud rate: 2400K
Stop Bit: 1
Delivery interval >80ms
No check digit
NOTE: Auto-Standby activates after 30 minutes of mute or no operation. Any adjustment turns
standby off.

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TROUBLESHOOTING
If your system is not operating properly, please refer to the following information. If the
problem persists, disconnect from power and contact your AV reseller immediately.
Problem
Correction
No Sound
•Turn off and check connections.
•Check output level from sources. For example, laptop
volume.
Microphone quiet
Some microphones have a gain switch. Consult the
manual.
No Power light
Check power connections
Abnormal load. Turn power off, disconnect some
speakers and test again
Distortion
Input gain too high
Volume too high
Loudspeakers may be worn or damaged
Feedback
Turn microphone down, or move away from speakers
Sound only coming out
one side
Turn off and switch output connections.
If the side changes the amplifier is okay –the fault is
with the speakers.
Switch input connections and check input cabling.

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SPECIFICATIONS
AMPLIFIER DIMENSIONS: 230 x 215 x 65 mm (wide x deep x tall) not including dials and
connectors
AMPLIFIER WEIGHT: 3.0kg
COLOUR: White
INPUTS
4 x Stereo inputs (via 3 x phono connectors / 1 x 3.5mm minijack)
1 x Microphone inputs via balanced XLR
OUTPUTS
1 x Stereo Line-level output via phono connectors
TECHNICAL DETAILS
2 x 100w @ 8 ohms
Total Harmonic Distortion <1%
Frequency response (line in): =20Hz~=20kHz
Signal to noise ratio (line in): 75dB
Rating input level/Impedance:
line in 800~900mV/47kohms
Power consumption (rating condition): <=125W
POWER SUPPLY: 100~240V Internal Power Supply
COMPLIANCES: RoHS, WEEE & CE compliant
ACCESSORIES INCLUDED
1 x 2-phono to 2-phono cable 2m long
1 x 3.5mm to 3.5mm minijack cable 2m long
2 x Unshielded Speaker Cable 5m long
1 x UK C7 figure-8 power cable 1.8 m long
1 x EU C7 figure-8 power cable 1.8 m long
1 x AU C7 figure-8 power cable 1.8 m long
1 x US C7 figure-8 power cable 1.8 m long
1 x Remote Control (Battery included: CR2025 3V Li-Mn)

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WARRANTY
This product comes with a 2-year return to base warranty, effective from the date of purchase.
This warranty applies only to the original purchaser and is not transferable. For the avoidance of
doubt, this will be taken from the information held by the appointed national distributor at the
point of sale. If the product is DOA (dead on arrival), you have 21 days from purchase date to
notify the national distributor via your AV reseller. The liability of the manufacturer and its
appointed service company is limited to the cost of repair and/or replacement of the faulty unit
under warranty, except for death or injury (EU85/374/EEC). This warranty protects you against
the following:
• Failure of any components, including the power supply.
• Damage when the product is first removed from its packaging if reported within 24 hours of
purchase.
If you find you do have a problem with this product, you should contact the AV reseller you
purchased this product from. The original purchaser is responsible for shipment of the product
to the manufacturer‟s appointed service centre for repair.
We will endeavour to return repaired units within 5 working days, however this may not always
be possible, in which case it will be returned as soon as practicably possible. In line with our
WEEE commitments, the manufacturer endeavours to replace the faulty parts of the product
rather than replacing the whole unit. This warranty does not protect this product against faults
caused by abuse, misuse, incorrect installation, unstable or faulty power input, which might be
caused by ignoring the guidelines set out in this manual.
LEGAL DISCLAIMER: Because we are committed to improving our products, the details above
may change without prior warning. This User Manual is published without warranty and any
improvements or changes to the User Manual necessitated by typographical errors, inaccuracies
of current information, or improvements to programs and/or equipment, may be made at any
time and without notice. Such changes will be incorporated into new editions of the User
Manual.