EA35 In-wall amplifier Manual and installation

EA35 In-wall amplifier Manual and installation
EA35 In-wall amplifier
Manual and installation instructions
General Description
The EA35 is a versatile in-wall amplifier for use in classrooms, hotel rooms, meeting rooms and also for use
in the home. The ideal choice where space or access is limited.
The amplifier is designed primarily for use with a PC and other devices such as DVD, MP3 or auxilary line
inputs and can also be used with sound reinforcement microphone systems.
The amplifier is ideal for use in a school classroom with either wall mounted or ceiling mounted speakers.
Two inputs with separate volume controls located on the front of the amplifier, give you the ability to easily
add sources such as a PC to the left hand input and a DVD player, MP3, iPod or other portable music source
to the right hand input which also has a switch to match the source to the amplifier.
The EA35 amplifier is a Class D Stereo amplifier providing 15 Watts per channel continuous power and up to
26 Watts short term power.
The amplifier has a modular design that fits into wall mounted faceplates and backboxes or even other
equipment with either an external laptop type DC power supply or a faceplate mounted power supply
To obtain the best performance from your amplifier please follow the guidance provided in this manual.
The amplifier complies with CE standards for Electro Magnetic Compatibility (EMC) and the Low Voltage
Directive (LVD) and with the Restriction of Hazardous Substances Directive (RoHS) (EU directive
The amplifier should be returned to the place of purchase at the end of its useful life for recycling.
The 24 volt DC power supply is designed for use with either 110 Volt or 240 Volt mains supply, please check
that you have purchased the correct power supply with your amplifier before connecting to the mains.
Amplifier controls and connections
Amplifier front panel
LED Power on/off indicator
Volume control PC in and power on/off switch.
Volume control Mic/MP3/Aux
DC Power input socket (24 volt)
Selector switch
PC Input
Mic/MP3/ Aux input
Amplifier rear connections
1. Left and Right speaker connections
2. Link for power supply module
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Power supply (module)
Mains input connections L=Live, N=neutral, GND= ground/earth
DC power link to amplifier socket
Power supply (External)
Power lead
Power supply
DC power cord
Rated Power Output 15Watts x 2
Output impedance 4Ω or 8Ω speakers
50Hz~50kHz ± 3dB
≥ 60dB (MIC)
≥ 70dB (AUX)
≥ 65dB (MP3)
5mV (MIC)
Input Sensitivity
50mV (MP3)
600mV (AUX)
10K (MIC)
47K (MP3)
Input Impedance
47K (AUX)
47K (PC)
Supply Voltage
DC 24V
Power Consumption 34W
85mm(W) x 72mm(D) x 85mm(H)
The amplifier is designed for use inside buildings and is best installed near to the location of it's input devices
such as PC or DVD player etc. In a classroom this would normally be close or next to the interactive
whiteboard at a height that is easily accessible by the teacher to control the volume and connect and
disconnect devices
The following locations should be avoided if possible
• Areas with excessive moisture or damp
• Places that expose the faceplate to direct sunlight
• Locations over radiators or other heating equipment
Back Box
The backbox design with sliding cable entry makes installation very easy, simply fix the back box to the wall
and place the cables in position, no need to thread cables or connectors through holes, though knock-outs
are provided if needed.
The lower half of the back box sliding plate can be “snapped off” or left whole if cables are fed from the rear
of the backbox
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Mounting the amplifier
Siting the back box is simplified by fixing an adhesive template to the wall, ensuring that it is horizontal
ideally using a spirit level. Drill the fixing holes and place suitable wall plugs in the holes to suit the wall
surface ie masonry or plasterboard etc.
Ensure that the cable entry is facing the direction that you want before fixing to the wall.
If additional cable entries are to be used decide where the cable shall enter the box and use pliers to break out the
plastic knockouts. Pass the cable through the hole and align the box up to the fixing hole you have drilled. Use
countersunk screws to fix the box to the wall. Before they have been fully tightened, use the spirit level to check that the
box is level.
Mounting the amplifier in Dado Trunking
The dual gang faceplate fits standard UK dual gang Dado accessory mounts and backboxes, but be sure
that the Dado backbox depth is sufficient for the cables and connectors. The amplifier requires a minimum of
35mm and if used with the internal DC power module 45mm.
Speaker installation
The amplifier is suitable for use with 4Ω or 8Ω speakers
Before connecting speakers to the amplifier. make sure that the amplifier and all associated equipment is
turned off.
Use a loudspeaker cable no lighter that 14 gauge AWG and no longer than 30 ft (10 metres) to avoid
noticeable signal loss from the cable.
Connect the cable leads from the output of the amplifier to the input terminal (binding) posts on the rear of
the loudspeaker cabinets.
Make sure that the speaker wires connect the amplifier to the speakers correctly ie the Left + on the amplifier
to +(or Red) on the speaker installed on the left side and Left – on the amplifier to – (or Black) on the same
speaker to maintain line polarity and to avoid phase distortion and simarlary with the Right speaker
Do not place the loudspeakers in a location where they will be exposed to direct sunlight, high
temperature, or high humidity.
Turn the volume control of your amplifier to it's lowest volume when first turning it on to avoid
damaging the speakers.
Do not exceed the maximum power rating of the speakers, as sound quality will be impaired and the
loudspeaker drivers may be damaged.
Operating instructions
Check that the volume control on/off switch is in the off position before connecting the DC power supply to
the amplifier or mains power to the power supply.
Ensure that all connections have been made including the speakers before switching on.
To obtain the best output quality, please select the correct input type corresponding to the input source as
For MIC input, slide the switch to the ‘MIC’ position.
For MP3 input, slide the switch to the ‘MP3’ position.
For CD/VCD/DVD input, slide the switch to the ‘AUX’ position.
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Protected by European Community Design Rights
Trouble shooting
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.
No sound
Turn unit off and check connections
Check output level from source e.g laptop or mp3
player output volume
No RED power indicator light
Sound from only one speaker
Smell of burning or smoke
The amplifier has temperature and overload
protection. This means if the operating temperature
is extreme (< -40ºC >+50ºC) or the amplifier is
overloaded it will temporarily mute itself. When
normal conditions return, it will resume working.
Check power connections
Volume is too high
Turn off and check connections
Turn off the amplifier immediately and unplug the
power cord. Contact your dealer or nearest service
Packing list
EA35 Amplifier module, or module fitted into single gang faceplate or module fitted into dual gang
Powerr supply either External or a power supply module (if not already fitted to faceplate)
Dual gang or single gang faceplate, 2x 18mm screws and 2x screw covers
Dual or single gang gang Back box including sliding plate
Template label for fitting backbox
Manual and Installation Instructions
Because we are committed to ongoing quality improvement the specification of this product may change without warning E&OE
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Copyright © 2008 Edis Trading (HK) Limited
Protected by European Community Design Rights
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