3e Audio SY-DAPx002 TPA3250/TPA3255 DSP Amplifier

[3eaudio]

TPA3255 version finally available for order: https://fr.aliexpress.com/item/1005001723899263.html?spm=a2g0w.12010612.8148356.3.4b25151cvexNui

You have to choose between 4 ohm and 8 ohm so I'm a bit lost...

Also, 240V for 220V at home, is it ok?

hoe this help:

• 100V include 100~120Vac
• 240V include 200~240Vac
• Universal input 100~240Vac -> SY-DAP1002 only

 

[daftcombo]

hoe this help:

• 100V include 100~120Vac
• 240V include 200~240Vac
• Universal input 100~240Vac -> SY-DAP1002 only

View attachment 93010

Thanks!

About the impedance, what should I choose for using with ELAC DBR-62 for example?

Min impedance of DBR-62 is 5 ohm:

 

[Toku]

Thanks!

About the impedance, what should I choose for using with ELAC DBR-62 for example?

Min impedance of DBR-62 is 5 ohm:

View attachment 93013

Maybe even if you connect a 4Ω load to the 8Ω / 44V version, you should be able to use it if you limit the output to 50W or less. This is a limitation from the current capacity of the power supply, and the amplifier itself can handle a 4Ω load.

 

[daftcombo]

Maybe even if you connect a 4Ω load to the 8Ω / 44V version, you should be able to use it if you limit the output to 50W or less. This is a limitation from the current capacity of the power supply, and the amplifier itself can handle a 4Ω load.

Is the contrary possible as well? Get the 4 ohm version and occasionnaly use it with 8 ohm-rated speakers?

 

[Toku]

Is the contrary possible as well? Get the 4 ohm version and occasionnaly use it with 8 ohm-rated speakers?

It is possible, but the output will be around 50W.
Below are the answers I got from 3e audio in other forums.
The only difference between the 8Ω version and the 4Ω version is the output voltage setting of the power supply, and it seems that you can switch to either model simply by adjusting the voltage. However, it is necessary to change the DSP firmware.
In actual use, it is often used with an output of up to about 10W, and I think it does not matter whether you purchase 4Ω or 8Ω.

---- 3e audio said ----
Hope this help understand which options you should go for.
in other word, you still can run at 4ohm on 8ohm model,but should not kill very high output as it may over power supply capability(amplifier is constant voltage output,the lower load the higher current draw from power supply).
also,the rail voltage configuration is changeable by DSP F/W,that is say,you can change 37V to 44V or 44V back to 37V for some reason want to pair different speaker, or getting more head room or want less power loss.

 

[daftcombo]

So, the 8 ohm version will allow more power but might damage the unit if used to play loud with too low impedance speakers?

 

[Ralferator]

hoe this help:

• 100V include 100~120Vac
• 240V include 200~240Vac
• Universal input 100~240Vac -> SY-DAP1002 only

View attachment 93010

I would like to know more about the differences too. Will the unit get too hot if the 8 Ohm version gets used with 4 Ohm speakers or what is the downside?

 

[tmortimer]

Just used the no ASB image with one of these: https://www.tinyosshop.com/usbi-dsp...ter_description=true&filter_sub_category=true

It seemed to work. I clicked the link/compile/download button, and then right clicked on the AU IC in the schematic and picked write to E2PRom. Nice cheap interface if anyone needs one.

 

[Ralferator]

Just used the no ASB image with one of these: https://www.tinyosshop.com/usbi-dsp...ter_description=true&filter_sub_category=true

It seemed to work. I clicked the link/compile/download button, and then right clicked on the AU IC in the schematic and picked write to E2PRom. Nice cheap interface if anyone needs one.

What's the difference to this one? https://de.aliexpress.com/item/10000090227951.html?spm=a2g0x.12010615.8148356.11.46796043oOgqoZ

 

[tmortimer]

What's the difference to this one? https://de.aliexpress.com/item/10000090227951.html?spm=a2g0x.12010615.8148356.11.46796043oOgqoZ

That looks like a whole DSP solution. I just ordered the usbi interface to program the dsp in the amp.

Ah I see that link also has the interface on it's own. Probably very little difference. Just happened to spot this one when I was looking into it.

 

[Toku]

So, the 8 ohm version will allow more power but might damage the unit if used to play loud with too low impedance speakers?

If you connect a 4Ω speaker to an 8Ω amplifier and play it at a loud volume that exceeds 50W, the power supply will overcurrent and the protection circuit will probably operate and playback will stop. However, there is no problem with the speaker unit. This issue arises from the capacity limitation of the power supply and is not related to the operation of the connected speakers.

 

[Ralferator]

If you connect a 4Ω speaker to an 8Ω amplifier and play it at a loud volume that exceeds 50W, the power supply will overcurrent and the protection circuit will probably operate and playback will stop. However, there is no problem with the speaker unit. This issue arises from the capacity limitation of the power supply and is not related to the operation of the connected speakers.

I am completely confused now.

What i don't understand: The version with the TPA3250 is supposed to produce 2 x 50 Watts at 8Ohm and 2 x 100 Watts at 4 Ohms.
How does it make sense then that the stronger version with the TPA3255 (8 Ohm version) can only produce 2 x 50 Watts at 4 Ohms but the 4 Ohm-Version can produce 2 x 200 Watt at 4 Ohms and 2 x 100 at 8 Ohms?

1. Shouldn't the TPA3255-Version be stronger than the TPA3250 version no matter if it's the 8 Ohm-version or the 4 Ohm-Version?
2. Why to even get the 8 Ohm Version? Will it be stronger than the 2 x 100 Watt at 8 Ohm that are specified?
3. Is the 4-Ohm version able to achieve the 2 x 100 Watt at 8 Ohm

Thanks for the help!

 

[daftcombo]

I am completely confused now.

What i don't understand: The version with the TPA3250 is supposed to produce 2 x 50 Watts at 8Ohm and 2 x 100 Watts at 4 Ohms.
How does it make sense then that the stronger version with the TPA3255 (8 Ohm version) can only produce 2 x 50 Watts at 4 Ohms but the 4 Ohm-Version can produce 2 x 200 Watt at 4 Ohms and 2 x 100 at 8 Ohms?

1. Shouldn't the TPA3255-Version be stronger than the TPA3250 version no matter if it's the 8 Ohm-version or the 4 Ohm-Version?
2. Why to even get the 8 Ohm Version? Will it be stronger than the 2 x 100 Watt at 8 Ohm that are specified?
3. Is the 4-Ohm version able to achieve the 2 x 100 Watt at 8 Ohm

Thanks for the help!

The only way to know would be to test both versions with different loads and see.

 

[renaudrenaud]

A bit confusing. I thought the 4/8 Ohms was relying on a different output filter.

I understand the appeal from something finished, but don't you think to build something with the 3eAudio TPA3255 board is not a better solution? I mean, no more ADC, just some DAC in input and the amp?

 

[Ralferator]

The only way to know would be to test both versions with different loads and see.

I wonder why 3e-audio doesn't give that information

 

[3eaudio]

I wonder why 3e-audio doesn't give that information

what expectation you want from us?did we declare 3255 output only 50W at 4ohm?
for the power vs rail voltage,it is very clear and you can find in the datasheet.
for our product design power rating is only for audio,not a constant output like putting a sine-tone as the DSP will do his job(please don't ask here once you has experience you will know).

 

[Ralferator]

what expectation you want from us?did we declare 3255 output only 50W at 4ohm?
for the power vs rail voltage,it is very clear and you can find in the datasheet.
for our product design power rating is only for audio,not a constant output like putting a sine-tone as the DSP will do his job(please don't ask here once you has experience you will know).

View attachment 93892
View attachment 93893

No you didn't say 50 Watts -i was referring to Toku. - He said the 8 Ohm-Version might not reach as high power than the 4 Ohm-Version. He said " the power supply will overcurrent and the protection circuit will probably operate and playback will stop " That is why i am asking.

In the data sheet you write that the TPA3255 amplifier reaches 2x100 watts at 8-Ohm and 2x200 watts at 4-Ohm. But to reach the 2x200 watts i would need to buy the 8-Ohm version with 44V power supply because the power supply of the 4-Ohm-Version only has 37V so it can't reach the 2x200 watts referring to the data sheet. But why do you sell a 4-Ohm-Version if only the 8-Ohm-Version (with the 44V power supply) reaches the 2x200 watts at 4 Ohms? Will the 8-Ohm-Version reach 200 Watts but overheat or shut off?

Is it safe to use 4-Ohm speakers with the 8-Ohm version?
Or does the 8-Ohm-Version get too hot with 4-Ohm speakers?

If i want to reach the 2 x 200 Watts for 4 Ohm speakers, should i buy the 8 Ohm version? Or should i buy the 4 Ohm version?

Please don't feel offended - i am just asking because i don't understand.

 

[3eaudio]

No you didn't say 50 Watts -i was referring to Toku. - He said the 8 Ohm-Version might not reach as high power than the 4 Ohm-Version. He said " the power supply will overcurrent and the protection circuit will probably operate and playback will stop " That is why i am asking.

In the data sheet you write that the TPA3255 amplifier reaches 2x100 watts at 8-Ohm and 2x200 watts at 4-Ohm. But to reach the 2x200 watts i would need to buy the 8-Ohm version with 44V power supply because the power supply of the 4-Ohm-Version only has 37V so it can't reach the 2x200 watts referring to the data sheet. But why do you sell a 4-Ohm-Version if only the 8-Ohm-Version (with the 44V power supply) reaches the 2x200 watts at 4 Ohms? Will the 8-Ohm-Version reach 200 Watts but overheat or shut off?

Is it safe to use 4-Ohm speakers with the 8-Ohm version?
Or does the 8-Ohm-Version get too hot with 4-Ohm speakers?

If i want to reach the 2 x 200 Watts for 4 Ohm speakers, should i buy the 8 Ohm version? Or should i buy the 4 Ohm version?

Please don't feel offended - i am just asking because i don't understand.

the power supply won't able to drive 2x200W at the same time no matter 8ohm or 4ohm, it's capability only around 250W maximum and 350W(peak) few millisecond.
250W(power supply) * 0.8 (amplifier efficiency) =200W (amplifier output)
200W/2 =100W per channel
refer to datasheet figure 8 we know
4ohm/100W ->31V
8ohm/100W ->42V
so back to your question,if you run at 4ohm speaker you don't need buy 8ohm option,as the 4ohm has few voltage margin(37V-31V),you probably still get a little bit higher output like 130~140W,but assuming your impedance won't lower than 4ohm.

 

[Ralferator]

the power supply won't able to drive 2x200W at the same time no matter 8ohm or 4ohm, it's capability only around 250W maximum and 350W(peak) few millisecond.
250W(power supply) * 0.8 (amplifier efficiency) =200W (amplifier output)
200W/2 =100W per channel
refer to datasheet figure 8 we know
4ohm/100W ->31V
8ohm/100W ->42V
so back to your question,if you run at 4ohm speaker you don't need buy 8ohm option,as the 4ohm has few voltage margin(37V-31V),you probably still get a little bit higher output like 130~140W,but assuming your impedance won't lower than 4ohm.
View attachment 94078

Thank you very much for the explanation! In fact the speakers i want to use with the amplifier, the JBL Stage A130 are 6 Ohm. Should i get the 4-Ohm-Version or the 8-Ohm-Version of the amplifier for those 6 Ohm speakers?

 

[ModDIY]

En s'appuyant sur le tableau 3eAudio (voir page précédente), avec un haut-parleur 6 ohms la version 4 ohms est préférable car à 31vdc, l'amplificateur fournira 70w / c, tandis que la version 8ohms dépassera les capacités du SMPS de cet amplificateur. Cela est uniquement dû à la capacité maximale du SMPS.... Le TPA3255 lui-même peut fournir plus de puissance sous 4 et 6 ohms s'il est branché sur une alimentation qui a plus de courant et de tension.