Fosi Audio TB10A User manual

FOSI AUDIO
Before using this product, Please be sure to read carefully this instruction manual and
keep it safe for further reference
Contents
Introduction
Package Contents
Product Specifications
Cleaning
Quick Setup
Troubleshooting Tips
FQA
About Fosi Audio
…..……………………………. 2
….……..…..…………………. 2
……...……………………………. 3
…………..….……………………. 4
….…………….………………. 7
……….…………………. 10
………….………..…………. 16
..………………………. 17
Warranty Information …………….………………………. 18
Product Overvieew .………………………. 4
Setup and Operation …….……….………………. 8
Comparison …………….………………………. 19
Amplifier User's Manual
TDA7498E/V1/TB10A
1
Contact us ….……..…..…………………. 2

FOSI AUDIO
Before using this product, Please be sure to read carefully this instruction manual and
keep it safe for further reference
Contents
Introduction
Package Contents
Product Specifications
Cleaning
Quick Setup
Troubleshooting Tips
FQA
About Fosi Audio
…..……………………………. 2
….……..…..…………………. 2
……...……………………………. 3
…………..….……………………. 4
….…………….………………. 7
……….…………………. 10
………….………..…………. 16
..………………………. 17
Warranty Information …………….………………………. 18
Product Overvieew .………………………. 4
Setup and Operation …….……….………………. 8
Comparison …………….………………………. 19
Amplifier User's Manual
TDA7498E/V1/TB10A
1
Contact us ….……..…..…………………. 2

Introduction
2 3
TB10A
•Fosi Audio TB10A Amplifier
•AC Power Cord
•24V Power Supply
•Instruction Manual
Package Contents
* For similar products information, please refer to the product page.
Any questions, please contact us at [e-mail]
V1.0G
•Fosi Audio V1.0G Amplifier
•AC Power Cord
•19V Power Supply
•Instruction Manual
TDA7498E
•Fosi Audio TDA7498E Amplifier
•AC Power Cord
•24V Power Supply
•Instruction Manual
Product Specifications
TB10A
•2.0 Channel
•SNR: ≥ 98dB
•Input Sensitivity: ≤ 280mV
•THD: ≤ 0.5%
•Output Power: 100W + 100W
•Power Supply: 24V 4.5A
•With Bass and Treble Volume
Control
•Power supply voltage range: 15v-24v
•Terminating Impedance: 2Ohm -
8Ohm
•Frequency Range: 20Hz - 20kHz (±1
dB)
•Input Mode: Analog
•Product Size: 130 x 100 x 35 mm
•Product Weight: 650g
•Power supply: 24V 4.5A
TDA7498E
•2.0 Channel
•SNR: ≥ 98dB
•Input Sensitivity: ≤ 280mV
•THD: ≤ 0.04%
•Output Power: 160W + 160W
•Power Supply: 24V 4.5A
•Power supply range: 12v-32v
•Input Mode: Analog
•Terminating Impedance: 2Ohm -
8Ohm
•Frequency Range: 20Hz - 20kHz (±1
dB)
•Product Size: 130 x 100 x 35 mm
•Product Weight: 850g
Welcome to the Fosi Audio family and congratulations on your purchase of
the Fosi Audio products.
The Fosi Audio team is dedicated to bringing you the highest-quality
listening experience and the Fosi Audio converters were designed with the
same attention to detail and operational simplicity as all other Fosi Audio
products. Our goal is to get you to your music as simply as possible without
all the “gadget tinkering ” many other products require. As with our past
efforts, we thank our customers, distributors, and resellers for the
inspiration to create another great product.
Contact us
Our website: www.fosiaudio.com
Amazon store: www.amazon.com/fosiaudio
Our Youtube channel: Fosi Audio
Our Facebook page: Fosi Audio
Whatsapp: [phone]
Email address:
[e-mail]
[e-mail]

Introduction
2 3
TB10A
•Fosi Audio TB10A Amplifier
•AC Power Cord
•24V Power Supply
•Instruction Manual
Package Contents
* For similar products information, please refer to the product page.
Any questions, please contact us at [e-mail]
V1.0G
•Fosi Audio V1.0G Amplifier
•AC Power Cord
•19V Power Supply
•Instruction Manual
TDA7498E
•Fosi Audio TDA7498E Amplifier
•AC Power Cord
•24V Power Supply
•Instruction Manual
Product Specifications
TB10A
•2.0 Channel
•SNR: ≥ 98dB
•Input Sensitivity: ≤ 280mV
•THD: ≤ 0.5%
•Output Power: 100W + 100W
•Power Supply: 24V 4.5A
•With Bass and Treble Volume
Control
•Power supply voltage range: 15v-24v
•Terminating Impedance: 2Ohm -
8Ohm
•Frequency Range: 20Hz - 20kHz (±1
dB)
•Input Mode: Analog
•Product Size: 130 x 100 x 35 mm
•Product Weight: 650g
•Power supply: 24V 4.5A
TDA7498E
•2.0 Channel
•SNR: ≥ 98dB
•Input Sensitivity: ≤ 280mV
•THD: ≤ 0.04%
•Output Power: 160W + 160W
•Power Supply: 24V 4.5A
•Power supply range: 12v-32v
•Input Mode: Analog
•Terminating Impedance: 2Ohm -
8Ohm
•Frequency Range: 20Hz - 20kHz (±1
dB)
•Product Size: 130 x 100 x 35 mm
•Product Weight: 850g
Welcome to the Fosi Audio family and congratulations on your purchase of
the Fosi Audio products.
The Fosi Audio team is dedicated to bringing you the highest-quality
listening experience and the Fosi Audio converters were designed with the
same attention to detail and operational simplicity as all other Fosi Audio
products. Our goal is to get you to your music as simply as possible without
all the “gadget tinkering ” many other products require. As with our past
efforts, we thank our customers, distributors, and resellers for the
inspiration to create another great product.
Contact us
Our website: www.fosiaudio.com
Amazon store: www.amazon.com/fosiaudio
Our Youtube channel: Fosi Audio
Our Facebook page: Fosi Audio
Whatsapp: [phone]
Email address:
[e-mail]
[e-mail]

4 5
Your home audio amplifier components are not water-resistant, so it’s
important that they should be kept free of moisture. You should clean only
with a dry cloth or tissue and no liquid cleaners or solvents should be used.
Cleaning
Product Overview
* For similar products information, please refer to the product page.
Any questions, please contact us at [e-mail]
1……… Treble Control
2……… Bass Switch
3……… Volume Control
4……… Power Indicator
5……… Power Switch
V1.0G
•2.0 Channel
•SNR: ≥ 98dB
•Input Sensitivity: ≤ 280mV
•THD: ≤ 0.04%
•Output Power: 50W + 50W
•Power Supply: 19V 4.74A
•Power supply range: 12v-24v
•Input Mode: Analog
•Terminating Impedance: 2Ohm -
8Ohm
•Frequency Range: 20Hz - 20kHz (±1
dB)
•Product Size: 130 x 100 x 35 mm
•Product Weight: 650g
3……… DC 12-24V Input
1……… 3.5mm AUX Input
2……… Speaker Output
TB10A
TDA7498E
1……… Volume Control
2……… Power Switch
3……… Power Indicator

4 5
Your home audio amplifier components are not water-resistant, so it’s
important that they should be kept free of moisture. You should clean only
with a dry cloth or tissue and no liquid cleaners or solvents should be used.
Cleaning
Product Overview
* For similar products information, please refer to the product page.
Any questions, please contact us at [e-mail]
1……… Treble Control
2……… Bass Switch
3……… Volume Control
4……… Power Indicator
5……… Power Switch
V1.0G
•2.0 Channel
•SNR: ≥ 98dB
•Input Sensitivity: ≤ 280mV
•THD: ≤ 0.04%
•Output Power: 50W + 50W
•Power Supply: 19V 4.74A
•Power supply range: 12v-24v
•Input Mode: Analog
•Terminating Impedance: 2Ohm -
8Ohm
•Frequency Range: 20Hz - 20kHz (±1
dB)
•Product Size: 130 x 100 x 35 mm
•Product Weight: 650g
3……… DC 12-24V Input
1……… 3.5mm AUX Input
2……… Speaker Output
TB10A
TDA7498E
1……… Volume Control
2……… Power Switch
3……… Power Indicator

6 7
* For similar products information, please refer to the product page.
Any questions, please contact us at [e-mail]
V1.0G
3……… DC 15-32V Input
1……… RCA Input
2……… Speaker Output
1……… Volume Control
2……… Power Switch
3……… Power Indicator
3……… DC 15-32V Input
1……… RCA Input
2……… Speaker Output
②
TB10A
Passive Speakers
PC/Laptop
Mobile Phone
Blu-Ray/DVD/CD
Player
TV
①
①
①
①
Quick Setup
TDA7498E
V1.0G
OR
OR
OR

6 7
* For similar products information, please refer to the product page.
Any questions, please contact us at [e-mail]
V1.0G
3……… DC 15-32V Input
1……… RCA Input
2……… Speaker Output
1……… Volume Control
2……… Power Switch
3……… Power Indicator
3……… DC 15-32V Input
1……… RCA Input
2……… Speaker Output
②
TB10A
Passive Speakers
PC/Laptop
Mobile Phone
Blu-Ray/DVD/CD
Player
TV
①
①
①
①
Quick Setup
TDA7498E
V1.0G
OR
OR
OR

8
① RCA Input
Fosi Audio Fosi Audio
Fosi Audio Fosi Audio
② RCA Output
Fosi Audio Fosi Audio
Fosi Audio Fosi Audio
Audio Connection
Setup and Operation
How to use the amplifier?
Step 1 - Connecting the Speaker Wire
BT10A accept bare wire, banana plugs, spade lugs, or pin terminators.
Please turn off the amplifier before connecting it to the speakers.
Preparing the Speaker Wire
① Separate the last 3” of each speaker wire conductor.
② Strip ½” of insulation from the end of each wire.
③ Twist the exposed copper strands with your fingers 3 or 4 times so the
strands stay together.
NOTE: As you make your connections, be sure to connect the positive (+)
terminals on your amplifier to the positive (+) terminals on your
speakers.Even if your wire does not have (+) or (-) markings, most 2-
conductor speaker wire has printing on one side to help you differentiate
between the wire pairs. The 4 pictures show how to make banana
connections as follows:
9
Using Bare Wire
1). Use your thumb and finger to unscrew the binding post connectors on
the back of each speaker.
2). Insert each speaker wire into the holes on the side of the binding post
connectors, observing proper polarity.
3). Retighten the binding posts with your fingers.
4). The stripped portion of the wire should be secured firmly in each
connector.
5). Make sure that none of the speaker wire strands have come in contact
with an adjoining terminal.
6). Repeat steps 1 and 5 to connect speaker wires to the amplifier.
Step 2 – Connecting the Power Supply
Be sure that the volume/power switch on the front panel is in the OFF
position before connecting the power supply.
Connect the cable with the round end from the power supply to the rear
panel power connector. Connect the AC power cable from the power
supply to a power outlet and verify that the indicator light on the power
supply is

8
① RCA Input
Fosi Audio Fosi Audio
Fosi Audio Fosi Audio
② RCA Output
Fosi Audio Fosi Audio
Fosi Audio Fosi Audio
Audio Connection
Setup and Operation
How to use the amplifier?
Step 1 - Connecting the Speaker Wire
BT10A accept bare wire, banana plugs, spade lugs, or pin terminators.
Please turn off the amplifier before connecting it to the speakers.
Preparing the Speaker Wire
① Separate the last 3” of each speaker wire conductor.
② Strip ½” of insulation from the end of each wire.
③ Twist the exposed copper strands with your fingers 3 or 4 times so the
strands stay together.
NOTE: As you make your connections, be sure to connect the positive (+)
terminals on your amplifier to the positive (+) terminals on your
speakers.Even if your wire does not have (+) or (-) markings, most 2-
conductor speaker wire has printing on one side to help you differentiate
between the wire pairs. The 4 pictures show how to make banana
connections as follows:
9
Using Bare Wire
1). Use your thumb and finger to unscrew the binding post connectors on
the back of each speaker.
2). Insert each speaker wire into the holes on the side of the binding post
connectors, observing proper polarity.
3). Retighten the binding posts with your fingers.
4). The stripped portion of the wire should be secured firmly in each
connector.
5). Make sure that none of the speaker wire strands have come in contact
with an adjoining terminal.
6). Repeat steps 1 and 5 to connect speaker wires to the amplifier.
Step 2 – Connecting the Power Supply
Be sure that the volume/power switch on the front panel is in the OFF
position before connecting the power supply.
Connect the cable with the round end from the power supply to the rear
panel power connector. Connect the AC power cable from the power
supply to a power outlet and verify that the indicator light on the power
supply is

10
illuminated. We recommend using a high-quality surge suppressor and/or
AC line later on all electronics equipment.
Step 3 – Connecting Audio Sources
Using the appropriate audio cable (AUX cable),
connect your audio source (computer, iPod, etc.) to amplifier audio inputs.
Step 4 – Operation
Turn on the BT10A volume/power knob and set the volume control to an
initial set of about 12 o’clock. Turn on your audio input source and adjust
the volume to your desired listening level.
NOTE: The sound may be improved much after 20 hours warm up.
1: Power Supply Indicator is not Illuminated.
1). Check to see that the AC power cord is securely connected to the
power supply and to an AC power outlet.
2). Check that the AC power outlet is supplying power, make sure the
power LED on the power supply will stay on.
3). If you make sure the power supply is defective, please contact us for
exchange.
2: If the Power Supply Light is on But You Are Experiencing an Audio-
Related Issue, Try These Tips.
1). Verify that the volume/power control on the front panel is not turned
all the way down or powered off (we recommend setting the volume to at
least the 12 o'clock position).
2). Check that the volume level of your audio source component or device
is not set to minimum volume or powered off.
3). Check speaker wire connections from the amp to the speakers by
removing the speaker wire from each speaker and then reconnecting. Also,
check the speaker wire polarity by verifying that the wires are going to the
same terminals on both speakers.
4). Check that the cables from your audio sources to the amplifier are
properly connected. Confirm this by unplugging the audio cables and then
reconnecting.
5). Try decreasing the volume of the input audio source and increase the
volume of the amp.
6). Try using different audio input sources and/or devices to see if the
problem follows.
7). Try swapping your left and right speaker to see if the issue remains on
the same channel or if it follows the speaker.
8). If you are using a computer connected to the amplifier, make sure the
volume is up on your media player, internet radio, master control, device
volume, etc. and that the balance control as centered.
9). If you are using a wireless adapter, preamp, or an external DAC with
your amplifier, remove these (temporarily) and connect the audio source
directly to the amplifier then to speakers.
10). If your input source has this own EQ, please make sure the low end is
at a moderate level, as having too much bass in your signal can obviously
cause some unwanted distortion.
11
Troubleshooting Tips

10
illuminated. We recommend using a high-quality surge suppressor and/or
AC line later on all electronics equipment.
Step 3 – Connecting Audio Sources
Using the appropriate audio cable (AUX cable),
connect your audio source (computer, iPod, etc.) to amplifier audio inputs.
Step 4 – Operation
Turn on the BT10A volume/power knob and set the volume control to an
initial set of about 12 o’clock. Turn on your audio input source and adjust
the volume to your desired listening level.
NOTE: The sound may be improved much after 20 hours warm up.
1: Power Supply Indicator is not Illuminated.
1). Check to see that the AC power cord is securely connected to the
power supply and to an AC power outlet.
2). Check that the AC power outlet is supplying power, make sure the
power LED on the power supply will stay on.
3). If you make sure the power supply is defective, please contact us for
exchange.
2: If the Power Supply Light is on But You Are Experiencing an Audio-
Related Issue, Try These Tips.
1). Verify that the volume/power control on the front panel is not turned
all the way down or powered off (we recommend setting the volume to at
least the 12 o'clock position).
2). Check that the volume level of your audio source component or device
is not set to minimum volume or powered off.
3). Check speaker wire connections from the amp to the speakers by
removing the speaker wire from each speaker and then reconnecting. Also,
check the speaker wire polarity by verifying that the wires are going to the
same terminals on both speakers.
4). Check that the cables from your audio sources to the amplifier are
properly connected. Confirm this by unplugging the audio cables and then
reconnecting.
5). Try decreasing the volume of the input audio source and increase the
volume of the amp.
6). Try using different audio input sources and/or devices to see if the
problem follows.
7). Try swapping your left and right speaker to see if the issue remains on
the same channel or if it follows the speaker.
8). If you are using a computer connected to the amplifier, make sure the
volume is up on your media player, internet radio, master control, device
volume, etc. and that the balance control as centered.
9). If you are using a wireless adapter, preamp, or an external DAC with
your amplifier, remove these (temporarily) and connect the audio source
directly to the amplifier then to speakers.
10). If your input source has this own EQ, please make sure the low end is
at a moderate level, as having too much bass in your signal can obviously
cause some unwanted distortion.
11
Troubleshooting Tips

11). Move your amplifier and speakers to a different location to see if
something is causing interference in the current setup. Something as
simple as a wireless internet router, cordless or mobile phone, or
halogen lamp nearby can cause interference.
3: No Sound.
1). Recheck speaker wire connections from the amplifier to each
speaker.
2). Verify that the amplifier and your source components are turned
on.
3). Check that the AC wall outlet is on and working.
4). Check that the cable from the power supply is connected to the
amp and the power supply indicator is on.
5). Check that the volume/power knob on the front panel is turned
on and not set to the minimum volume.
6). Check that your audio source(iPad, computer, etc.) are turned on
and not set to the minimum volume, please change the audio source
if you can.
7). Check that the cables from your audio sources are working and
are properly connected.
8). Please sure the “Power” LED on the amp is on when you switch on.
4: Sound Through One Speaker Only.
1). Recheck all speaker wire connections on the speakers and the
amplifier.
12
2). Check that the cables from your audio sources to the amplifier are
properly connected.
3). Please swap the RCA input, right and left channel, if the opposite
channel can't work, the issue may from your audio source or RCA cable.
If that channel still can't work, the issue may from your speakers or this
amplifier. Please contact us if this amp has this issue.
4). Please exchange the speakers' wire from the amplifier speakers' output,
if the issue remains, the issue may from the speaker or the speakers' wire,
if the issue follows, the issue may from the amplifier
5). If you are using a computer connected to the amplifier, make sure the
volume is up on your media player, internet radio, master control, device
volume, etc. and that the balance control as centered.
5: Lack of Bass or Poor Imaging.
1). Check the polarity of the speaker wires on the amplifier and both
speakers.
2). Check the EQ or sound settings on your audio source.
3). Make sure the bass control on the amplifier has set up.
6: Sound Distorted.
1). Decrease the volume of the input audio source and increase the volume
of the amplifier.
2). Please make sure your speakers are passive speakers, not active
speakers.
13

11). Move your amplifier and speakers to a different location to see if
something is causing interference in the current setup. Something as
simple as a wireless internet router, cordless or mobile phone, or
halogen lamp nearby can cause interference.
3: No Sound.
1). Recheck speaker wire connections from the amplifier to each
speaker.
2). Verify that the amplifier and your source components are turned
on.
3). Check that the AC wall outlet is on and working.
4). Check that the cable from the power supply is connected to the
amp and the power supply indicator is on.
5). Check that the volume/power knob on the front panel is turned
on and not set to the minimum volume.
6). Check that your audio source(iPad, computer, etc.) are turned on
and not set to the minimum volume, please change the audio source
if you can.
7). Check that the cables from your audio sources are working and
are properly connected.
8). Please sure the “Power” LED on the amp is on when you switch on.
4: Sound Through One Speaker Only.
1). Recheck all speaker wire connections on the speakers and the
amplifier.
12
2). Check that the cables from your audio sources to the amplifier are
properly connected.
3). Please swap the RCA input, right and left channel, if the opposite
channel can't work, the issue may from your audio source or RCA cable.
If that channel still can't work, the issue may from your speakers or this
amplifier. Please contact us if this amp has this issue.
4). Please exchange the speakers' wire from the amplifier speakers' output,
if the issue remains, the issue may from the speaker or the speakers' wire,
if the issue follows, the issue may from the amplifier
5). If you are using a computer connected to the amplifier, make sure the
volume is up on your media player, internet radio, master control, device
volume, etc. and that the balance control as centered.
5: Lack of Bass or Poor Imaging.
1). Check the polarity of the speaker wires on the amplifier and both
speakers.
2). Check the EQ or sound settings on your audio source.
3). Make sure the bass control on the amplifier has set up.
6: Sound Distorted.
1). Decrease the volume of the input audio source and increase the volume
of the amplifier.
2). Please make sure your speakers are passive speakers, not active
speakers.
13

14
3). Please unplug the RCA input, connect this amp to your speakers, then
connect it to power supply, switch on and volume up, to hear whether
noise or hum remain, if yes, the issue may from the amplifier or your
speakers, if not, the issue may from your RCA cable or audio source, please
change the audio source and audio cable to try again.
4). Please make sure all the cable completely pushed into the device,
incompletely connections will create distorted.
5) Please make sure the BT10A have enough power to drive your speakers,
check the specs of your speakers, and if you need more power, you can
use a more powerful power supply, such as 24V 8A, 24V 10A.
7: Low Volume.
1). Recheck the volume on your audio source and this amplifier is turned
up and not set to minimum volume.
2). Please make sure your audio source needs a pre-amp or not.
3). If you are using the turntable, please make sure that if your turntable
needs an phono preamp or not, some turntable built-in phono preamp,
some are not.
8. Hum Noise
Adding a new component such as your BT10A amplifier can bring out hum
or buzz that may not have existed before. Your first assumption may be
Adding a new component such as your BT10A amplifier can bring out hum
or buzz that may not have existed before. Your first assumption may be
that something is wrong with the component but this is generally caused
15
by a “ground-loop” in your system. Consider these tips for possible
solutions:
• First, try moving all components to the same electrical circuit or AC
outlet.
• If the hum or buzz is still present, power off all gear and remove the
mini-jack and/or RCA audio cables to and from the BT10A amplifier.
• Turn the BT10A back on and check for hum. If the noise is still audible try
plugging the power supply power cable into a different AC outlet.
• If the hum goes away while the audio cables are still disconnected, the
noise is likely coming from another component in your system. Connect
each component back one at a time and the one that causes the system
to hum is likely the culprit.
• A common ground-loop source is from cable TV or satellite cables. If the
hum or buzz persists after trying the previous tips, disconnect the
audio cable from your cable box, TV, or DVR and if the hum goes away
the cable is the cause. In this case, you can get a ground-loop isolator
from your local electronics store. These are inexpensive and easy to
connect inline with your video cable.
• Sometimes something as simple as a portable heater or dehumidier
will add noise into your wall wiring that could be picked up by your
audio gear. A dimmer switch on a halogen lamp, a wireless internet
router, or wireless phone near the amplifier, for example, could also all
be possible culprits.
The best overall solutions are to use an AC line liter, plug the unit into a
different AC circuit, or in the case of noise introduced by a wireless router,
for example, move it further away from your audio gear.

14
3). Please unplug the RCA input, connect this amp to your speakers, then
connect it to power supply, switch on and volume up, to hear whether
noise or hum remain, if yes, the issue may from the amplifier or your
speakers, if not, the issue may from your RCA cable or audio source, please
change the audio source and audio cable to try again.
4). Please make sure all the cable completely pushed into the device,
incompletely connections will create distorted.
5) Please make sure the BT10A have enough power to drive your speakers,
check the specs of your speakers, and if you need more power, you can
use a more powerful power supply, such as 24V 8A, 24V 10A.
7: Low Volume.
1). Recheck the volume on your audio source and this amplifier is turned
up and not set to minimum volume.
2). Please make sure your audio source needs a pre-amp or not.
3). If you are using the turntable, please make sure that if your turntable
needs an phono preamp or not, some turntable built-in phono preamp,
some are not.
8. Hum Noise
Adding a new component such as your BT10A amplifier can bring out hum
or buzz that may not have existed before. Your first assumption may be
Adding a new component such as your BT10A amplifier can bring out hum
or buzz that may not have existed before. Your first assumption may be
that something is wrong with the component but this is generally caused
15
by a “ground-loop” in your system. Consider these tips for possible
solutions:
• First, try moving all components to the same electrical circuit or AC
outlet.
• If the hum or buzz is still present, power off all gear and remove the
mini-jack and/or RCA audio cables to and from the BT10A amplifier.
• Turn the BT10A back on and check for hum. If the noise is still audible try
plugging the power supply power cable into a different AC outlet.
• If the hum goes away while the audio cables are still disconnected, the
noise is likely coming from another component in your system. Connect
each component back one at a time and the one that causes the system
to hum is likely the culprit.
• A common ground-loop source is from cable TV or satellite cables. If the
hum or buzz persists after trying the previous tips, disconnect the
audio cable from your cable box, TV, or DVR and if the hum goes away
the cable is the cause. In this case, you can get a ground-loop isolator
from your local electronics store. These are inexpensive and easy to
connect inline with your video cable.
• Sometimes something as simple as a portable heater or dehumidier
will add noise into your wall wiring that could be picked up by your
audio gear. A dimmer switch on a halogen lamp, a wireless internet
router, or wireless phone near the amplifier, for example, could also all
be possible culprits.
The best overall solutions are to use an AC line liter, plug the unit into a
different AC circuit, or in the case of noise introduced by a wireless router,
for example, move it further away from your audio gear.

16
Q: Can I Leave the Fosi Audio Amps Power on all the Time? Does it safe?
A: Sure, the Fosi Audio amps are class d amplifiers, will cost very low
power when nothing playing through it, and it's safe and you can leave it
on all the time.
Q: Can I exchange the power supply come with the amplifier and to get
more power?
A: The BT10A come with 24V 4.5A power supply, it's enough for most
bookshelf speakers, but if you want to get more power, you can exchange
the power supply, the voltage range is DC12-24V, you can use 24V 8A, or
24V 10A power supply.
17
About Fosi Audio
Fosi Audio designs and builds innovative audio products with all your
music in mind. Great sound, simple but elegant designs, high-quality
materials, and truly useful features are what Fosi Audio is about. We
sincerely hope you get as much enjoyment from our products as we’ve had
creating them!
Our Email:
[e-mail]
www.fosiaudio.com
Whatsapp: [phone]
Q: What Type of Speakers Work Best with Fosi Audio Amplifier?
A: Fosi Audio Amplifiers work great with any 2, 4, 6 or 8-ohm passive
spakers. But Please know that the amplifier is for passive speakers,
not for powered speakers and subwoofers.
Q: Can I Connet a Turntable to My Amp,Why is the Volume is
Extremely Low?
A: Some Turntable may not have a built-in preamp and you would
need to add an external phono preamp to bring the instrument-level
signal of the turntable to line-level. Some turntables may have a
built-in preamp but have a switch on the back for either “line” or
“phono”, such as the Music Hall USB-1 or the Audio Technica AT-
LP120, the switch would need to be selected to “ line” in order to
work directly with the speakers.
Q: Can I Connect a Subwoofer to the Fosi Audio Amps?
A: If you bought subwoofer amps from Fosi Audio or 2.1 channel
amplifier(the amp that with sub output), you can connect to a
subwoofer, but if you got the 2.0 channel amp, you can't connect to
the subwoofer.
Q: Can I Take My Amp to Another Country with a Different Voltage?
A: Fosi Audio amps come with a power supply that accepts AC110V-
240V, it will automatically convert to different voltage when plugged
in. The power cable is also detachable which makes it convenient to
replace the AC plug with a different type if you don't want to use an
adapter plug.
FQA

16
Q: Can I Leave the Fosi Audio Amps Power on all the Time? Does it safe?
A: Sure, the Fosi Audio amps are class d amplifiers, will cost very low
power when nothing playing through it, and it's safe and you can leave it
on all the time.
Q: Can I exchange the power supply come with the amplifier and to get
more power?
A: The BT10A come with 24V 4.5A power supply, it's enough for most
bookshelf speakers, but if you want to get more power, you can exchange
the power supply, the voltage range is DC12-24V, you can use 24V 8A, or
24V 10A power supply.
17
About Fosi Audio
Fosi Audio designs and builds innovative audio products with all your
music in mind. Great sound, simple but elegant designs, high-quality
materials, and truly useful features are what Fosi Audio is about. We
sincerely hope you get as much enjoyment from our products as we’ve had
creating them!
Our Email:
[e-mail]
www.fosiaudio.com
Whatsapp: [phone]
Q: What Type of Speakers Work Best with Fosi Audio Amplifier?
A: Fosi Audio Amplifiers work great with any 2, 4, 6 or 8-ohm passive
spakers. But Please know that the amplifier is for passive speakers,
not for powered speakers and subwoofers.
Q: Can I Connet a Turntable to My Amp,Why is the Volume is
Extremely Low?
A: Some Turntable may not have a built-in preamp and you would
need to add an external phono preamp to bring the instrument-level
signal of the turntable to line-level. Some turntables may have a
built-in preamp but have a switch on the back for either “line” or
“phono”, such as the Music Hall USB-1 or the Audio Technica AT-
LP120, the switch would need to be selected to “ line” in order to
work directly with the speakers.
Q: Can I Connect a Subwoofer to the Fosi Audio Amps?
A: If you bought subwoofer amps from Fosi Audio or 2.1 channel
amplifier(the amp that with sub output), you can connect to a
subwoofer, but if you got the 2.0 channel amp, you can't connect to
the subwoofer.
Q: Can I Take My Amp to Another Country with a Different Voltage?
A: Fosi Audio amps come with a power supply that accepts AC110V-
240V, it will automatically convert to different voltage when plugged
in. The power cable is also detachable which makes it convenient to
replace the AC plug with a different type if you don't want to use an
adapter plug.
FQA

18
Warranty Information
All Fosi Audio products have an 18-month limited warranty on parts and
labor from the date of purchase. Please contact us if you have any
problems.
Note: After-sale service email
What Is Covered？
All defective parts or faulty workmanship.
What Is Not Covered？
The warranty doesn't cover damage caused by accident, misuse, abuse,
neglect, excessive moisture, lightning, power surges, other acts of nature,
unauthorized product modification or repaires, or failure to follow the
instructions outlined in this guide.
What We Will Do？
We will repair or replace any defective parts, at our option, within a
reasonable amount of time and free of charge any time during the
warranty period.
What We Ask From You？
You will be responsible for shipping charges to Fosi Audio or to an
authorized dealer. We recommend and you keep the original shipping
materials to prevent shipping damage if service is need. Fosi Audio cannot
be responsible for any damages incurred during shipping due to poor
packing, so please pack well and make sure to insure your shipment.
Comparison
19
Model
BT20A
BT10A
TB10A
V1.0G
TDA7498E
Channel
2.0CH
2.0CH
2.0CH
2.0CH
2.0CH
Bluetooth
Version
5.0
5.0
-
-
-
Max Output
Power Per
Channel
100watt
50watt
100watt
50 watt
160 watt
Bass and
Treble
Control
YES
YES
YES
NO
NO
With BT
and AUX
selector
Auto Switch
Auto Switch
-
-
-
Input ways
AUX + BT
AUX + BT
AUX
AUX
AUX
Output to
Passive
speakers
Passive
speakers
Passive
speakers
Passive
speakers
Passive
speakers
Power
Supply
24V
19V
24V
19V
24V
Additional
Features
Best seller
Simple but
Powerful
Best seller
Really clean
sound
quality
Powerful
and great
sound
quality
Size
130*100*35
mm
107*87*30
mm
130*100*35
mm
130*100*35
mm
130*100*35
mm

18
Warranty Information
All Fosi Audio products have an 18-month limited warranty on parts and
labor from the date of purchase. Please contact us if you have any
problems.
Note: After-sale service email
What Is Covered？
All defective parts or faulty workmanship.
What Is Not Covered？
The warranty doesn't cover damage caused by accident, misuse, abuse,
neglect, excessive moisture, lightning, power surges, other acts of nature,
unauthorized product modification or repaires, or failure to follow the
instructions outlined in this guide.
What We Will Do？
We will repair or replace any defective parts, at our option, within a
reasonable amount of time and free of charge any time during the
warranty period.
What We Ask From You？
You will be responsible for shipping charges to Fosi Audio or to an
authorized dealer. We recommend and you keep the original shipping
materials to prevent shipping damage if service is need. Fosi Audio cannot
be responsible for any damages incurred during shipping due to poor
packing, so please pack well and make sure to insure your shipment.
Comparison
19
Model
BT20A
BT10A
TB10A
V1.0G
TDA7498E
Channel
2.0CH
2.0CH
2.0CH
2.0CH
2.0CH
Bluetooth
Version
5.0
5.0
-
-
-
Max Output
Power Per
Channel
100watt
50watt
100watt
50 watt
160 watt
Bass and
Treble
Control
YES
YES
YES
NO
NO
With BT
and AUX
selector
Auto Switch
Auto Switch
-
-
-
Input ways
AUX + BT
AUX + BT
AUX
AUX
AUX
Output to
Passive
speakers
Passive
speakers
Passive
speakers
Passive
speakers
Passive
speakers
Power
Supply
24V
19V
24V
19V
24V
Additional
Features
Best seller
Simple but
Powerful
Best seller
Really clean
sound
quality
Powerful
and great
sound
quality
Size
130*100*35
mm
107*87*30
mm
130*100*35
mm
130*100*35
mm
130*100*35
mm