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TPA3250 FX-AUDIO FX502SPRO


Mr_oD

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hace 14 horas, funkyto dijo:

Muchas gracias. A esperar si alguien mas puede aportar, realmente solo quiero eliminar la compresión y el medio algo filoso de los TPA.

Pudiste probarlo conectando un buffer a tubos entre la fuente y el TPA?
No sé de qué manera afecte la dinámica.. con mi FX-Audio Tube-01 me dio la impresión que aumentaba, pero no me hace sentido, porque al agregar otra etapa de preamplificación, sólo me hace sentido que dinámica se mantenga si se nivela a unity gain, y que la señal se comprima si se levanta la señal. De todas formas el buffer le agrega un toque de sonido análogo.

 

Encontré un video interesante con respecto a eso:

 

Editado por diego_
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Yo tengo varios AmpOp que pedí a Aliexpress hace un tiempo y no los tocado, tengo a 3 equipos que se los podría cambiar, pero son más pares que esos, voy a buscarlos y poner acá la cantidad exacta por modelos.
Lo que me interesaría es que alguien me ayude a cambiarlos y entregaría como pago una pareja de AmpOp, que les parece?

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Estoy ubicado en la comuna de Las Condes y más específicamente en el barrio de El Golf, lo demás por MP
Lo que he encontrado de AmpOp son los siguientes :
20 piezas de Opa2135
5 piezas de LM4562NA
Sirven?

Saludos,
Eduardo

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Estimados, les presento el nuevo ampli clase D barato y recomendado por Audio Science Review:

https://www.audiosciencereview.com/forum/index.php?threads/fosi-audio-v3-amplifier-review.45757/

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Se ve bien

Fosi Audio V3 stereo amplifier budget review.jpg

Fosi Audio V3 stereo amplifier budget back panel 32 volt power supply review.jpg

Fosi Audio V3 stereo amplifier budget back panel 48 volt power supply review.jpg

Yes, it is a larger supply but you are going to hide it behind your desk anyway so might as well live the good life with the increased power there. image.gif

The amplifier is based on TI TPA3255 class D amplifier IC. There are replaceable op-amps for those of you who have nothing better to do than mess with the design.

When I took the amplifier out of the package, I noticed something rattling in there. Fearing the worst, I took the unit apart. Turns out one of the two large power supply caps had lost its adhesion to the PCB. The putty used is to keep the cap glued to the PCB was too flexible and had broken loose. No harm though as the cap is laying on its side and can't go anywhere. The sound I was hearing was it moving just a hair up and down and hitting the top of the case. Suggest company use a different material to fix this.

I will post the pictures of the insides later. For now, a large aluminum couples the amplifier IC to the case. There is no thermal grease but the amp ran cool enough that I don't think you need to worry about it. But if you are, this you can remedy yourself. Despite me pushing the amp to max power repeatedly, it just got warm to touch. The protection circuit was the best kind with high tolerance of clipping and audio-restart.

Fosi Audio V3 Amplifier Measurements
I performed the low power tests using the 32 volt supply. The rest is done with both. So let's start with our usual dashboard:

Fosi Audio V3 stereo amplifier budget measurement.png



Distortion is nicely kept to -100 dB so we are noise limited causing SINAD to land around 88 dB. This is well above average for all amplifiers tested:

Best budget stereo amplifier review 2023.png



Notice how many amplifiers it beats to the right of it!

Noise performance is also quite good for the class, almost clearing the hurdle for 16 bit content at just 5 watts:
 

Fosi Audio V3 stereo amplifier budget SNR measurement.png



Frequency response shows load dependency which all class D amplifiers in this price range show:

Fosi Audio V3 stereo amplifier budget Frequency Response measurement.png


In English, this means that depending on which speaker you use, the sound may be a bit bright or a bit dull if your hearing extends to 20 kHz. You can counter with EQ (which you better have for good sound in your room).

Multitone and 19+20 kHz show good performance for the class:

Fosi Audio V3 stereo amplifier budget Multitone measurement.png

 

Fosi Audio V3 stereo amplifier budget 19 20 kHz measurement.png



Edit: forgot to post crosstalk measurement:

Fosi Audio V3 stereo amplifier budget Crosstalk measurement.png



Let's see how much power we can get out of this little box into 4 ohm:

Fosi Audio V3 stereo amplifier budget Power 4 ohm measurement.png


You normally wouldn't expect to get more power with a 48 volt supply compared to 32 volt when their current ratings are the same. But as I noted in the picture at the start, the larger power supply is conservatively rated and is able to pump out more current for peaks. We can see this in our short-term power measurements:

Fosi Audio V3 stereo amplifier budget Max and Peak 48 volt Power 4 ohm measurement.png


 

Fosi Audio V3 stereo amplifier budget Max and Peak 32 volt Power 4 ohm measurement.png



With 8 ohm volt, we are more in need of voltage so naturally we get tons more there as well with the 48 volt supply:

Fosi Audio V3 stereo amplifier budget Power 8 ohm measurement.png



Transfer function is quite good for class D and I was especially impressed with its ability to pump out same power at high frequencies as many amplifiers go into protection there:
 

Fosi Audio V3 stereo amplifier budget Power 4 ohm vs frequency measurement.png



There is some pop noise when turning on and off but it is very mild:

Fosi Audio V3 stereo amplifier budget Pop on off measurement.png



The amplifier is stable on power up:

Fosi Audio V3 stereo amplifier budget warm up measurement.png



Some of you have been aiming at creating more work for me by asking for for efficiency tests. I developed a test that is semi-automatic and provides reasonable accuracy (within 5%):
 

Fosi Audio V3 stereo amplifier budget Power Efficiency measurement.png



Note that part of the heat is dissipated in the power supply and part in the amp. The X axis is power per channel, not total (amp is driven in stereo).

Edit: here are the teardown pictures:

Fosi Audio V3 stereo amplifier budget teardown Top PCB.jpg


 

Fosi Audio V3 stereo amplifier budget teardown bottom PCB heatsink.jpg


Conclusions
State of the art DACs run on highly performant silicon that when well implemented, produces the best performance we have seen. We are seeing similar development with these class D IC amplifiers. Noise and distortion is quite low and beats many amplifiers in the market. They bring two drawbacks: external power supplies and load dependencies. If the latter is resolved, these amplifiers would obsolete large segment of the audio market!

The Fosi Audio V3 is well implemented and brings nice looks and design at a bargain price. Company is also quite receptive to customer input and is a delight to work with behind the scenes. I don't know what else we could ask for!

I am going to recommend the Fosi Audio V3 stereo amplifier.

EDIT: a few pages in the thread claim was made that the input buffer opamp must be fake as they don't look like the official TI chip packaging. Company chimed in a couple of days later saying they bought the ICs directly from TI. And showed the purchase order proving the same. It seems the "internet got this wrong" as far as what constitutes a fake as TI is using two different factories with different packaging.

-----------
As always, questions, comments, recommendations, etc. are welcome.

 

Cartel

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Hice una comparación entre el Breeze Audio TPA 3116, el FX502sPro y el Fosi V3:

 

Posteo en ASR

 

En resumen:

 

Los 3 son increíblemente parecidos al escuchar la grabación. Lo escuché con audífonos BT aptx y no percibía la diferencia. Luego lo escuchamos con unos colegas en una sala de post de audio (monitores, tratamiento acústico) y salían a flote las mismas diferencias que percibí en persona, que reitero son muy sutiles.

 

Clips comparativos (la imagen indica cuál ampli está sonando)

 

El Breeze Audio quizás sea más low fi, acentúa el rango de frecuencias en donde se mueven los power chords con distorsión y quizás enmascara más los detalles, pero es muy agradable de escuchar.

 

El FX502sPro es más chillón, el que más fatiga, sobre todo cuando le dan a los platillos de forma permanente, pero es más fácil escuchar los detalles que con el Breeze Audio. Mis amigos ingenieros en sonido lo encontraron con menos graves que los otros dos.

 

El Fosi v3 es más oscuro y probablemente más plano. Los agudos suenan fuerte, pero sin estridencias molestas. Lo he ecuchado muy poco, pero me da la impresión que debe andar bien. Supongo que en una comparativa de segundos sería fome conformarse con este sonido más plano si lo comparas con los otros amplis que son más brillantes, pero que luego de unos el oído se debe acostumbrar y fatigar menos por el exceso de brillo.

 

Es posible que a futuro mi opinión vaya a cambiar, pues lo he escuchado muy poco.

 

 

*Por alguna razón Tapatalk le cambió el nombre a mi usuario al momento de comentar.

 

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