Can I play music off a USB stick?
Can I input sound through a AUX-in jack?
How can I use better speakers than 8 ohm ones?
Thumbdrive - No.
My DFPlayer Mini doesn't have an AUX-IN jack. I don't see any indication in the documentation that I have that the DFPlayer Mini supports any audio input.
What do you mean by "better speakers"?
The sound using the speaker terminals is pretty good, volume depends on the speaker itself, having that in a box helps.
I haven't used the L,R outputs. Those are supposedly for headphone use. They could probably be coupled to a power amp.
And there is a considerable tick/pop when it powers on.
@killzone_kid
Didn't you change or swap a resistor to make that tick/pop go away?
yes, but there are many variations DF Player warning!
some don’t have it
@runaway_pancake
The example there won't work though, they aren't programming normally and I don't understand it.
The 8 ohm speakers I have are supposed to be really good, but the sound is rubbish.
https://photos.app.goo.gl/XntjSgghjN9nNDvH7
It's probably to do with the speaker I have then. It's old, but supposed to be really good.
It's got that paper/fabric coating on it, not the rubbish plastic.
Is that supposed to always happen, or only when I use the L, R outputs?
Red LED.
Looks run of the mill, to me. How good is the sample, though? Placing the speaker in a styro cup or a cardboard box can make a big improvement in volume and fidelity.
I don't know anything about having a USB-host facility (news to me if so, but, sorry).
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@runaway_pancake
How hard would it be to connect to something like this:
It's wattage is way too high for a DFPlayer... 
Not hard, just a couple of leads, same as with your "lo-fi" unit.
Still, outside an enclosure it will underwhelm.
@runaway_pancake
Don't I need a amp or something?
Not the way I see it, but that may depend on what you're trying to accomplish.
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Note that “speaker quality” is NOT related to the “ohms” rating. Very expensive hi-fi speakers were almost exclusively “8 ohms.”
A speaker in a well-designed box will sound better.
Amplified “computer speakers” are probably a reasonable compromise, both becaUse of the amp, and the packaging.
How do I make a well designed box?
Any box is probably better than no box.
Heavy and rather sound-deadening materials (wood, particle board) seem to be popular; I think part of the idea is to prevent the sounds emitted from the back of the speaker from interfering with the exactly out-of-phase sound from the front. You rapidly enter a realm of black magic and voodoo, with oxygen free virgin leather, tuned ports, microfiber baffles, and other stuff. Loudspeaker Enclosure Design Guidelines
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@westfw
What do you think of the speaker in post #8? You seem like you know your way around audio.
- I think the DFPlayer is probably designed to drive an 8ohm speaker, and using a 4ohm speaker might cause sub-optimal behavior. (But I can't find any actual specs that detail this.)
- I think the speaker in #8 is designed to be mounted in an automobile and connected to an overpowered "car stereo", and wouldn't be optimal when connected to the low-power dfplayer.
- I think it's overpriced.
- I think it still doesn't have a box.
How about something like https://www.amazon.com/DOSS-Wireless-Bluetooth-Portable-Speaker/dp/B01CQOV3YO ? Built-in battery-powered amp, and it has a wired input that will connect to the DFPlayer DAC outputs, and you can just ignore the bluetooth aspect. (as do most of the "Bluetooth speakers")
Agreed. But its supposed to be really good sound.
I'm building this music player into my house, so I will be building boxes around the speakers.
That bluetooth speaker looks great, but how will it go mounted in my ceiling with only a speaker grill showing??
And driving them from a DFPlayer??!!
They sell ceiling-mount speakers. They're essentially designed to use the ceiling space/drywall as their "enclosure."
Yes. Using AUX out.
Does this look good for testing purposes?