user69682: I use my Seeeduino V4, DFPlayer mini, and this speaker module from AliExpress to create an automatic doorbell.  The problem is that it seems that this speaker module's Yurobot amplifier is not powerful enough to create a noise-free loud sound. Also, the bundled speaker is 0.5 W, 8 Ω.
There is a volume selector on the speaker module. If it is selected to a value a bit higher than 0 then the sound's quality is quite high (click here to listen), but the volume is not enough by far for a doorbell, even though the DFPlayer's programmed volume is set to maximum.
But if I increase the amplifier's volume selector to something near maximum, I start hearing some very scary noises (please click here to listen).
How can I increase the volume without having hard-to-listen-to noises? Maybe I need to buy another, better amplifier?

user61722: The DFPlayer already has a 3 W amplifier on it, so you can connect a speaker directly to the DFPlayer. There is no need for an extra amplifier.
If you do connect an extra amplifier to the DPlayer, and turn the volume of the DFPlayer up too far, the input of the second amplifier will clip and it won't sound good.
Also, the output of the DFPlayer is probably from a class-D amplifier designed to be connected directly to a speaker; it won't play nice with other amplifiers.
You should try how the DFPlayer sounds when you connect a speaker directly to it. The 0.5 W speaker you have is not a good fit; it can't handle the power of the DFPlayer's amplifier.
A 3 W (or more), 8 Ω speaker would be good for this if you want to use the maximum power the DFPlayer can deliver. According to most publications on the interwebs a 2 W, 8 Ω speaker will also do, but I would be careful with turning the volume all the way up.
Note that the DFPlayer can pull a fair bit of current (about 25 mA in standby, and in the order of 200 mA when playing) and it needs a power supply that can deliver that.

69682: <p>I use my Seeeduino V4, DFPlayer mini, and <a href="https://aliexpress.com/item/1005001383483648.html?spm=a2g0s.9042311.0.0.264d33edTuDjJ5&amp;_ga=2.178383712.550996950.1607518110-1523012225.1596878040&amp;sku_id=12000015889248158" rel="nofollow noreferrer">this</a> speaker module from AliExpress to create an automatic doorbell.  The problem is that it seems that this speaker module's Yurobot amplifier is not powerful enough to create a noise-free loud sound. Also, the bundled speaker is 0.5 W, 8 Ω.</p>
<p>There is a volume selector on the speaker module. If it is selected to a value a bit higher than 0 then the sound's quality is quite high (click <a href="https://youtu.be/VEp05yVo2UI" rel="nofollow noreferrer">here</a> to listen), but the volume is not enough by far for a doorbell, even though the DFPlayer's programmed volume is set to maximum.</p>
<p>But if I increase the amplifier's volume selector to something near maximum, I start hearing some very scary noises (please click <a href="https://youtu.be/GpeJw1ATuAY" rel="nofollow noreferrer">here</a> to listen).</p>
<p>How can I increase the volume without having hard-to-listen-to noises? Maybe I need to buy another, better amplifier?</p>
 61722: <p>The DFPlayer already has a 3 W amplifier on it, so you can connect a speaker directly to the DFPlayer. There is no need for an extra amplifier.</p>
<p>If you do connect an extra amplifier to the DPlayer, and turn the volume of the DFPlayer up too far, the input of the second amplifier will clip and it won't sound good.</p>
<p>Also, the output of the DFPlayer is probably from a class-D amplifier designed to be connected directly to a speaker; it won't play nice with other amplifiers.</p>
<p>You should try how the DFPlayer sounds when you connect a speaker directly to it. The 0.5 W speaker you have is not a good fit; it can't handle the power of the DFPlayer's amplifier.</p>
<p>A 3 W (or more), 8 Ω speaker would be good for this if you want to use the maximum power the DFPlayer can deliver. According to most publications on the interwebs a 2 W, 8 Ω speaker will also do, but I would be careful with turning the volume all the way up.</p>
<p>Note that the DFPlayer can pull a fair bit of current (about 25 mA in standby, and in the order of 200 mA when playing) and it needs a power supply that can deliver that.</p>
