It's an extremely cheap amp you can find for $30.
Naturally they had to cut lots of corners for that price but I'm surprised it sounds as good as it does.
check out pics of disassembly of it here.
There are some interesting design choices they made to reduce cost that may actually help the sound.
Like how the both the RCA connectors and speaker binding posts connect directly to the PCB for no wires and short signal path.
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I'd be really curious how your SB20FRPC30-8 speakers sound hooked up to this cheap amp with source feeding it via RCA in instead of the BT.
Pattern 2 - The singer and the musical accompaniment sound better balanced.
I opened a little the distance between my desktop speakers (2 m apart) and listening at the sweet spot.
The singer at the left side of the stage , close to drums. Not a wide stage. The impression is that all instruments are "electrical" - plugged-in . I have some reservations about the percussion. Maybe it is "real".
But after 2 listening to both tracks, no difference. Maybe this
Elias
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This is awesome, thanks for taking the time to do this. 👍
To me pattern 2 through the PC sounds a little better. But is the difference big? not to my ears and the cheap headphones I'm using atm.
And both recordings with the SB speakers (to me) sound better than the recording using the MarkAudio speakers.
To my ears the more forward mids of the MA obscures some of the low level details and the SBs just sound smoother and more relaxed and musical to me. Perhaps the MA provides more detail in the mids at the expense of being a little "bright" sounding. I't a subjective opinion of course.
PS. a good trick would have been to not tell us which recording was pattern-1 vs pattern-2 and let us decide blindly which we prefer 😉
Also, obviously just using this one song/recording is hard to judge the overall quality of the system and speakers' differences, but it's still interesting and enlightening!
It's very surprising how good some of these uber-cheap amps are and these old/cheap TPA3116 chips which supposedly "on paper" are inferior to the newer amp chips like the TPA3221 TPA3251 TPA3255 and MA12070. Clearly if you have high sensitivity speakers you don't need the extra power output so I wonder how they compare for sound quality at just a few watts output. 🤔
@nandappe what do you think about the sound of the amp and the SB vs MA speakers?
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TPA3116D2 chip is a perfect match for the CHP90 and SB20FRPC30-8.
If we listen with our eyes closed, no one will think it's a $30 amp.
I compared the spectra.
It's satisfying to hear and see.
If we listen with our eyes closed, no one will think it's a $30 amp.
I compared the spectra.
It's satisfying to hear and see.
@nandappe If you're still interested to experiment with very inexpensive amps here is a similar cheaply made $30 (or here) bluetooth amp using an amp chip that is now nearly as well known as the TI TPA3116, the slightly more powerful Infineon "Merus" MA12070. You can even use the same 20V power supply you have.
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Yes it's rediculously ugly and cheaply made but what does it sound like?
It's made by Nobsound here. and called the Douk Audio M100. Marketing vid here.
For sale here on the Douk Audio Aliexpress page.
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If I may "add" something, there is this https://www.diyaudio.com/community/threads/transformer-fed-tda8932-25w-8r-mono-amp-kits.359193/ amplifier, I'm planing to have as soon as I can . My replacement speakers pair just started the trip to me. Does any of the readers and participants of this thread have any experience with the specific amplifier ? The Aliexpress sold tda8932 amplifier board (ridiculously cheap) I received today didn't worth the waiting .
(Still I prefer Nandappe's design
As for Infineon's chip ... Maybe too early for Hi-End/Hi-Fi amplifiers commercially sold
Elias
(Still I prefer Nandappe's design
DDVP-12.5-ML [TQWT]
even if "it is not specifically designed for CHP-90". I told you that I want a floor stander 😉)As for Infineon's chip ... Maybe too early for Hi-End/Hi-Fi amplifiers commercially sold
Elias
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Sorry, I do not know the sales store.
Please contact your Mark Audio distributor.
https://www.markaudio.com/dealers/
Too much of thread but do you know if TC7FD00-4 can matched to Model : HB-06F (not very far from PEERLESS PLS-830985 I see in the list)
Elias
Elias
I have not heard of TC7FD00-4, but from the datasheet I think it will work fine.
@nandappe or anyone, do you know how these switching "rechargers" power supplies act when connected to an audio amplifier that does not operate according to the "QC" (quick charge) protocols? do they just supply their max voltage?
eg., the Kovol KV-PC019 in the pic below it will supply it's maxiumum 28 volts to the amplifier?
the spec's say it can produce 5V⎓3A, 9V⎓3A, 12V⎓3A, 15V⎓3A, 20V⎓5A, 28V⎓5A, 140W Max.
Although elsewhere on their site it says the type-c port can produce 120 watts
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eh, I just read that these PD 3.1 adapters (power delivery) won't go above 100 watts without the power sink negotiating that. So I guess they won't work well for amps.
It appears that using the "Trigger Cable with e-Marker (20V)" for the PD power supply can take up to 20V, 5A.
So far, 20V, 5A, 100W seems to be the upper limit for the cable.
I do not know about the KV-PC019.
I have never seen a cable that can take out 28V, 5A, 140W.
The amp I used is 12V-24V (max,50W+50W) compatible, so I could use it.
So far, 20V, 5A, 100W seems to be the upper limit for the cable.
I do not know about the KV-PC019.
I have never seen a cable that can take out 28V, 5A, 140W.
The amp I used is 12V-24V (max,50W+50W) compatible, so I could use it.
yeah that works OK for a TPA3116 amp but I bought a TPA3250 amp and want to use a 24 volt (minimum) supply.
I was hoping I could find a GaN supply like this that would output 24v and 4 amps at least, but I'm not having luck so will prob buy a more traditional laptop-charger type. The 3250 can use up to 32v supply and often recommended is 24V 5A
maybe I can find a notebook style charger that uses GaN technology.
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I think the key is in PD 3.1 this requirement "entry into EPR mode"
and maybe the power sink device (laptop, amplifier, LED lights) need to trigger this or maybe a special USB-C cable can do it? I don't know.
and maybe the power sink device (laptop, amplifier, LED lights) need to trigger this or maybe a special USB-C cable can do it? I don't know.