Amphony L1520 Manual

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User and Installation
Guide
5.8 GHz DIGITAL Wireless
Audio Transmitter / Amplifier
Model 1520

Contents
Unpacking
Connecting the transmitter
Connecting the amplifier
Placing the transmitter and amplifier
Operating the transmitter
Operating the amplifier
Troubleshooting
Technical specifications
Safety information
Your warranty
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User and Installation Guide
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Step 1Step 1 Connecting the transmitter
The transmitter connects either to a standard line-out audio interface via the
supplied RCA cable or to an amplified speaker output via the supplied short
speaker cables.
If the transmitter is connected via speaker cables, observe the polarity of the
cable connection to ensure that the transmitter will be fed with a correct
polarity signal. If one of the cables is switched (reversed), one speaker will
receive an opposite polarity signal which will degrade sound performance.
The transmitter can also be connected to other audio outputs by using an
appropriate adapter.
Connect the supplied small AC adapter’s barrel-shaped plug into the DC 9V
jack, and then plug the transformer into a standard AC outlet. We recommend
the use of a surge protector to protect the transmitter from power surges.
Unpacking: Check that this package contains:
One 5.8 GHz Digital Audio transmitter - Model 1520, one DigitalAudio
amplifier - Model 1520, one small and one large AC adapter (wallwart), two
short speaker cables, one RCA audio cable.
ATTENTION! Do not use both the speaker cables and RCA cable. Do not
connect speakers to the transmitter. Do not connect the large
AC adapter to the transmitter.
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LRDC 9V
L R
L R
AUDIO
LINE OUT
Audio Source
Transmitter
DC 9 V
300 mA
Power outlet
AC adapter
Using the transmitter RCA audio input:

LRDC 9V
L R
Using the transmitter speaker audio input:
Transmitter
DC 9 V
300 mA
Power outlet
AC adapter
L R
SPEAKER OUT
Audio Source
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Step 2Step 2 Connecting the amplifier
Connect the DC power input of the amplifier with the supplied large 24 V AC
adapter (wallwart). The use of a surge protector is recommended to protect
the amplifier from power surges which may damage the amplifier and
connected speakers or may cause audio dropouts.
The amplifier connects to regular passive loudspeakers via regular speaker
cables (not included). Observe the correct polarity when connecting the
speakers.
It is also possible to connect both speakers to separate amplifiers by using
an additional amplifier. In this case connect one speaker to the left audio
output of the first amplifier and the second speaker to the right audio output
of the second amplifier. One audio output of each amplifier will not be used
in this case.
ATTENTION! Never short circuit any amplifier audio output since this may
damage the amplifier.A clicking noise may be generated
during amplifier power up. Therefore, it is recommended to
connect power to the amplifier prior to connecting the
speakers.

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Amplifier
DC 24 V
1000 mA
DC 24 V
1000 mA
Power outlet
AC adapter
Speakers

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Step 3Step 3 Placing the transmitter and amplifier
For optimum reception, the amplifier should be placed within the line of sight
from the transmitter. If possible, the amplifier should be placed right side up
with its front toward the transmitter.
The transmitter should be placed at an elevation such that there are no
obstacles between the transmitter and amplifier (line of sight) in an area
where there will be the least amount of traffic. We suggest that you place the
transmitter on top of your audio source. Example 1 on page 8 shows the
optimum placement of the transmitter and amplifier.
The amplifier can also be placed as shown in example 2. In this case, no line
of sight exists and the operating range is reduced.
You can mount the amplifier vertically by using the 2 screw openings at the
bottom of the amplifier. If the amplifier is mounted vertically, the operating
range is reduced compared to mounting the amplifier right side up.
The amplifier incorporates a directional antenna which prefers signals
transmitted toward the front of the amplifier. Therefore, the front of the
amplifier should always be facing toward the direction of the strongest
transmitter signal. By properly orienting the amplifier, interference from other
signal sources can be minimized.
We suggest that you experiment with placement in order to find the best
location for the transmitter and amplifiers.
Note: This product will not work properly from within an enclosed metal
cabinet.

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Example 1: Amplifier placed
on top of a speaker Example 2: Amplifier mounted vertically behind a speaker
Transmitter
Speaker
Amplifier
Transmitter
Speaker
Amplifier
line of sight indirect connection
(reflected signal)

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Step 4Step 4 Operating the transmitter
After powering up the transmitter, the transmit light will go on for approximately
five seconds while the transmitter initializes.
After initialization, the transmit light will go out.
Initially, set the transmitter volume control to a middle setting.
Once audio is detected at the audio input, the transmit light will go on and the
transmitter will transmit the audio signal.
When audio is no longer detected, the transmitter will go into standby mode
after approximately one minute. The transmit light will go out. During standby
mode, no signal is transmitted.
5.8 GHz Digital Audio Transmitter5.8 GHz Digital Audio Transmitter
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TRANSMIT
TRANSMIT
Transmit light

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LRDC 9V
LR
Transmitter volume control

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Step 5Step 5 Operating the amplifier
As soon as a valid transmitter signal is received by the amplifier, the amplifier
will output the amplified audio signal to the speaker outputs. You can change
the audio level by adjusting the amplifier volume control.
If no audio signal is received for more than 2 minutes, the amplifier will go into
standby mode (power-down mode).
In order to achieve maximum transmission quality, the transmitter volume
control should be set to match the audio level of your audio source as follows:
1) Set the amplifier volume control to a low level to prevent clipping inside the
amplifier.
2) Set your audio source to output the maximum audio level that you will
encounter during normal operation.
3) Turn the transmitter level control knob to the position that yields maximum
audio loudness to the speakers without any clipping (distortion). If the
transmitter level is set too low, the dynamics of the transmission are not
fully used. If the level is set too high, audio clipping (distortion) will occur
inside the transmitter.
4) Turn the amplifier volume control to a setting that yields the desired volume
from the speakers.
Amplifier
volume
control

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Problem Possible Cause Solution
The transmitlight
does not go on after
DC power is applied
to the transmitter
Faulty AC adapter
or faultypower outlet Check the power outlet and the ACadapter; if possible,
check for correct voltage of
the ACadapter.
No audio present at
audio input Check the audio connection to the transmitter and ensure
that there is audio present.
The transmitlight
goes out after a few
seconds and does
not light again Transmitter hung up Disconnect and then
reconnect DC power.
Faulty AC adapter
or faultypower outlet See under “Faulty AC adapter or faultypower outlet“ above.
Transmitter volume
control set toolow Adjust the transmitter volume control.
Amplifier volume
control set toolow Adjust the amplifier volume control.
No audio at
amplifier
Strong interference See under “Strong
Interference“ on next page.
Transmitter volume
control set too high Adjust the transmitter volume control until clipping stops.
Amplifier volume
control set too high Adjust the amplifier volume control until clipping stops.
Audio is distorted
Strong interference See under “Strong
Interference“ on next page.
Transmitter volume
control set toolow Adjust the transmitter volume control to achieve the desired
audio level.
Speaker audio level
is toolow
Amplifier volume
control set toolow Adjust the amplifier volume control to achieve the desired
audio level.
Troubleshooting

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Problem Possible Cause Solution
Speaker audio level
is toolow Audio signal too weak Increase the output level of the audio source (connect
transmitter to an adjustable
output by using an adapter if
necessary).
Strong interference In some cases, there may be
strong interference preventing
proper reception of the audio
signal which can be caused
by 5.8 GHz cordless
telephones or 5.8 GHz
wireless networks. Either
eliminate the interference,
locate the base unit of the
cordless phone in another
room, set the wireless
network to use the 5.1 GHz
frequency band rather than
5.8 GHz, relocate the
transmitter, relocate or
reorient the amplifier.
Audio drops out
intermittently or
crackles
Unstable power
supply Ensure that the power outlet delivers a stable voltage. Very
strong surges or voltage
fluctuations may cause audio
dropouts. Try using a surge
protector.

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Problem Possible Cause Solution
Strong interference See under “Strong
Interference“ on previous
page.
Transmitter volume
control set toolow Adjust the transmitter volume control.
Audio is noisy
Audio signal too
weak See under “Audio signal too weak“ on previous page.
Strong interference See under “Strong
Interference“ on previous
page.
Transmitter range is
extremely short
Too many obstacles Audio will drop out if there are
too manyobstacles between
the transmitter and the
amplifier (see page 4), try
relocating the amplifier or
transmitter toimprove
reception or use a model
1550 transmitter.
For more information, including a detailed troubleshooting guide,
visit the Amphony web site at: www.amphony.com

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Technical Specifications
Transmitter:
Audio transmission method: Digital
Transmitter frequency: 5.8 GHz
Error correction: 1/2 rate FEC
Audio sampling method: 128 times oversampling
Transmitted data rate:> 3 Mbps
Transmitter operating range:
max. 100 ft. line of sight, max. 30 ft. through walls and ceilings
Amplifier:
Output power: 2 * 15 W (RMS)
Frequency response: 20 Hz … 23 kHz @ 8 Ohms
Signal-to-noise ratio: 91 dB (Transmitter / Amplifier, A-weighted)
Total harmonic distortion: typ. 0.05 % @ 10 W
Overall audio latency: < 1 ms
Power efficiency: 75 %
Channel separation: typ. 75 dB
Automatic amplifier power down feature

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IMPORTANT SAFETY INFORMATION ATTENTION!
READ THESE SAFETY INSTRUCTIONS CAREFULLY AND
HEED ALL WARNINGS IN THIS MANUAL.
POWER SOURCE
To avoid product malfunction, and to protect against electric shock, fire or personal
injury, please observe the following:
• This product has been designed to work with 120-volt AC current using the
supplied AC adapters. Connection to a line voltage other than that or use of non-
compatible AC adapters may create a safety and fire hazard and may damage
the product.
• Do not run power cords under rugs or carpets or place heavy objects on them.
• Damaged or deformed power cords are hazardous and should be replaced
immediately by a qualified service technician.
LOCATION
• Do not use this product outdoors or in cars.
• Air vents are provided at the bottom of the amplifier to prevent excessive
temperatures inside the unit. Do not place the amplifier in closed spaces, cover it,
or otherwise block the vents.
• Do not place this product in direct sunlight, or near heat sources.
• Keep this product away from strong magnetic objects.
VOLUME CONTROL
• Do not turn up the volume while listening to a portion with very low level input or
no audio signal to avoid damage to your speakers during a peak level audio
portion.
• Turn the amplifier volume control to minimum prior to connecting or disconnecting
the transmitter or amplifier and prior to switching audio sources as this may cause
loud clicks which can damage your speakers.
CARE
• Do not insert or drop anything into the amplifier through the air vents as this could
cause serious damage, possibly resulting in fire.
• Do not place any object containing water or other liquids on this product.
• Do not remove the cabinet. Touching parts inside the cabinet could result in
electric shock and damage to the product.

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NON-USE PERIODS
• When the product is not being used for a long period of time, unplug the product.
CLEANING
• Unplug the product before cleaning.
• When the system gets dirty, wipe it with a clean, soft cloth. If necessary, wipe it
with a soft cloth, slightly dampened with soapy water. Wipe dry immediately with
a dry cloth.
• Never use benzene, aerosol cleaners, thinner, alcohol or any volatile cleaning
agent.
• Do not use abrasive cleaners, as they may damage the finish.
SERVICE
• Do not open the cabinet of any components. Opening the cabinets may present a
shock hazard, and any modification to this product will void your warranty.
• Do not attempt to service the unit yourself. If liquid or any metal objects such as
paper clips, wire or staples accidentally fall inside, disconnect the product from
the power source immediately, and consult an authorized service center.
• Please refer any service to an authorized Amphony service center.
Copyright (C) 2007 Amphony.All rights reserved.
The information contained herein is subject to change without notice.
Revisions may be issued to advise of such changes and/or additions.
All product names, trade names, or corporate names mentioned in this
document are acknowledged to be the proprietary property of the registered
owners.
FCC ID PMJT1500
This device complies with part 15 of the FCC Rules. Operation is subjected to
the following two conditions: 1) This device may not cause harmful
interference and 2) this device must accept any interference received,
including interference that may cause undesired operation.
Caution: Any changes or modifications not expressly approved by the party
responsible for compliance could void the user's authority to operate the
equipment.

Limited warranty
WHAT YOUR WARRANTY COVERS
This warranty extends only to the original user of the equipment (“you”, ”your”) and is
limited to the purchase price of each part. Amphony and its affiliated companies (”we”,
”our”, ”us”) warrant this Wireless Transmitter / Amplifier Set against defects in materials
or workmanship as follows.
LABOR: For a period of ninety (90) days from the original date of purchase, if we
determine that the equipment is defective subject to the limitations of this warranty, we
will replace it at no charge for labor. We warrant any such work done against defects in
materials or workmanship for the remaining portion of the original warranty period.
PARTS: For a period of one (1) year from the original date of purchase, we will supply,
at no charge, new or rebuilt replacement parts in exchange for parts we determine are
defective subject to the limitations of this warranty. We warrant any such replacement
parts against defects in materials or workmanship for the remaining portion of the
original warranty period.
Note: ”Parts” means items included in this package. It does not include other parts
purchased separately.
WHAT YOUR WARRANTY DOES NOT COVER
This warranty does not cover consumer instruction, physical setup or adjustment of any
consumer electronic equipment, or signal transmission problems.
This warranty does not cover cosmetic damage, damage due to the affixing of any
attachment not provided with the product, loss of parts, connecting the product to any
but the specified receptacles, lightning, electrical surges, fire, flood, or other acts of
God, accident, misuse, abuse, repair or alteration by other than authorized service
personnel, negligence, commercial or institutional use, or improper or neglected
maintenance.
This warranty does not cover equipment sold AS IS or WITH ALLFAULTS, equipment
removal or reinstallation, shipping damage if the equipment was not packed and
shipped in the manner we prescribe, nor equipment purchased, serviced, or operated
outside the contiguous United States ofAmerica.

LEGAL LIMITATIONS
REPLACEMENT AS PROVIDED UNDER THIS WARRANTY IS YOUR EXCLUSIVE
REMEDY. WE SHALL NOT BE HELD LIABLE FOR ANYINCIDENTAL OR
CONSEQUENTIAL DAMAGES FOR BREACH OF ANY EXPRESSED OR IMPLIED
WARRANTY ON THIS EQUIPMENT, NOR FOR ANY INCIDENTAL OR
CONSEQUENTIAL DAMAGES RESULTING FROMTHE USE OF, OR INABILITYTO
USE, THIS EQUIPMENT. UNDER NO CIRCUMSTANCES SHALL OUR LIABILITY, IF
ANY, EXCEED THE PURCHASE PRICE PAID FOR THIS EQUIPMENT, EXCEPT TO
THE EXTENT PROHIBITED BY APPLICABLE LAW. EXCEPTAS PROVIDED
HEREIN, WE MAKE NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
WARRANTIES OF MERCHANTABILITYAND FITNESS FOR APARTICULAR
PURPOSE. WE RESERVE THE RIGHT TO REFUSE TO HONORTHIS WARRANTY
IF WE DETERMINE ANY OF THEABOVE EXCEPTIONS TO HAVE CAUSEDTHIS
EQUIPMENT NOT TO HAVE PERFORMED PROPERLY. THIS WARRANTY SHALL
BE VOID IF ANY FACTORY-APPLIED IDENTIFICATION MARK, INCLUDING BUT
NOT LIMITED TO SERIAL NUMBERSAND WARRANTY LABELS, HAS BEEN
ALTERED OR REMOVED. THIS WARRANTY SHALL ALSO BE VOID IFTHE
TRANSMITTER OR AMPLIFIER HAVE BEEN OPENED BY AN UNAUTHORIZED
PERSON.
This warranty gives you specific legal rights which may vary from state to state. Some
states do not allow the exclusion or limitation of incidental or consequential damages,
or allow limitations on the duration of an implied warranty, so those limitations may not
apply to you.
Note: No responsibility is assumed for the presence of interference outside of
Amphony’s control, such as other transmitters or cordless phones, which may hamper
proper signal reception.