YS Audio APP download link: https://www.pgyer.com/f9KC

Note!
It needs to be assembled by yourself, and the material package is given a screwdriver.
The suitable power supply of the product is DC power supply, and AC power supply is not allowed!
The color of the product may be slightly different from the picture due to the differences of light, angle and
shooting equipment.
The product size is measured manually. Please allow slight deviation in the measurement data and make sure
you don't mind.

Product parameters
Brand: YS Audio
Product Name: 2.1 channel BT power amplifier
Product Model: YS-AS21
Amplify Chip: TPA3251
Channels: 2.1 channel (left channel + right channel + subwoofer)
Audio Enter: AUX + BT + USB disk + USB Sound Card
BT Version: 5.1
Switching Mode: Mechanical switch(without long press and wait)
Adaptive Power supply: DC16~38 V ,≥10A
Adapter Speaker:
L&R channels 30-220W，3-8Ω
Subwoofer 30-350W,2-8Ω
Output power:
R&L channel≤220W,
subwoofer≤350W
Protection Mechanism: Protection against reverse connection, undervoltage, overheating, overcurrent and
short circuit (automatic recovery without restart)
Voltage gain: 30dB
Product Size: 141*131*27mm
Product Weight: about 346g
Package Weight: about 408g


Tip: when the audio signal input is large enough and the power supply voltage / current is large enough, there
will be enough output power!

The higher the power supply voltage, the greater the output power, the smaller the speaker impedance, and
the greater the output power!

Please ensure that the power of the adaptive power supply is greater than the actual working power of the
power amplifier!

Product Introduction
There is a clear distinction between the power input terminal and the speaker wiring terminal to prevent the
speaker from being connected to the power terminal and burning the speaker.

Product Features:

1.The product is designed with two Texas Instruments tpa3251 power amplifier chips, with ultra-low distortion
and high-definition sound quality.

2.Multiple audio inputT modes, BT + TO + USB flash disk + USB Sound card.

3.The power input terminal shall be clearly distinguished from the speaker wiring terminal to prevent the
speaker from being connected to the power terminal and burning the speaker.

4.Mechanical volume knob, turn the knob to switch the machine on and off, no need to press and wait to see
the indicator light. True stepless tuning.

5.Six low-noise preamplifiers 5532, with large gain and improved sound quality and volume.

6.The tin spraying design of wiring opening window and the tin spraying design of wiring opening window on
the back of bare board increase the output power.

7.Support YS Audio APP, APP comes with situational music, support to modify BT name, set BT password,
prompt tone, volume adjustment / switch prompt tone, Lullaby + timed shutdown, sound effect adjustment,
support to customize 10 sound effects, which can be adjusted arbitrarily.USB flash disk, music selection,
playlist.

Simple appearance without exaggeration

The voice of YS Audio brand is born for music fever. It has simple appearance, high-definition sound quality and
high fidelity.

Lullaby music allows you to return to nature, help you sleep, decompress and heal your body and mind. Wuzhi
Audio APP has the function of regular shutdown.

10 natural sounds are Sound bowl, Stream, Wave, Sea wave, Thunderstorm, Bird song, Cry of insects, Frogs,
Bonfire, Guqin, up to 1023 sound combinations.

10 kinds of natural sounds create unique natural sound scenes, create a natural atmosphere, quickly calm your
mood and realize deep sleep.

Change BT name:
The BT name of each product can be changed, and multiple products can be easily identified.

Change BT password:
The BT connection password can be modified to prevent others from hijacking.
This function can be turned off.

Adjust the volume of prompt tone:
The volume of prompt tone can be adjusted to meet different needs of customers.

ON / OFF prompt tone:
The prompt tone can be turned on or off.

USB flash disk playlist function:
Open the playlist of USB flash disk, select music at will, and support shaking to switch songs.

YS Audio APP has popular, classical, jazz, country, natural, rock and other sound effects. It supports custom 10
segment sound effects and arbitrary adjustment to make up for deficiencies, so that different speakers can
achieve better sound effects.

BT name modification steps:
[enter a new BT name] → [click set button] → [system automatic restart] → [cancel pairing of mobile BT with the original BT name] → [find a new BT name and re pair]

BT password setting steps:

Method 1:
[turn on BT password switch]→Use default password 1111

Method 2:
[turn on BT password switch] → [enter password] → [click the setting button] → [the system will restart automatically] → [cancel pairing, and you will be prompted to enter password when connecting again]