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3e Audio TPA3251 TPA3255 Finished Amplifier with PFFB is coming!

Anyone else notice the little note on their spec chart saying 3-5db channel imbalance when the volume knob is in 7-9pm range?
Probably inconsequential for anyone using preamp or DAC for volume control, since the 3e amp would likely be fixed at noon or higher, but still stuck me as a bit odd.
 
Prices to Germany with tax but without (double) discount ;-)
View attachment 413147

I agree, the same applies to shipment. But somehow I expected that a finished amp in a small case with a PSU brick would be cheaper than putting modules with a decent PSU in a case, but it isn't.
Additional little inconvenience is that AliExpress will not apply vat at origin (>150eur) so most people will still need to add a fee for the carrier. The cheapest one in my country is 15 EUR.
@3eaudio if you make these available from Amazon/audio phonics etc they might be more competitive(?)
 
Anyone else notice the little note on their spec chart saying 3-5db channel imbalance when the volume knob is in 7-9pm range?
Probably inconsequential for anyone using preamp or DAC for volume control, since the 3e amp would likely be fixed at noon or higher, but still stuck me as a bit odd.
This is typical of analogue potentiometers, channel imbalance is always a concern and they are typically worst performing in the very low volume range.
Happy to see them proactively acknowledge it.
 
@3eaudio , will the SE models be fine when paired with "nominal" 4 ohm speakers that have an actual minimum impedance of ~3.2 ohm?
In other words, are your 4 ohm specs also "nominal-ized" like most speaker manufacturers specs?
I'd be surprised if they didn't. TI explicitly specifies the SE configurations for loads down to 2 ohm. Power scales almost linearly down to 2 ohm.
TP3255 SE.png

The SE configuration is more suitable for lowish loads than BTL (which 3e Audio do not offer), but is of course less powerful than PTBL. I don't see a reason why the A7se should perform any worse than the evaluation board, quite the contrary.

Please design and good/easy/simple way to update your device's firmware, as its very likely it will have some issues that you did not foresee or correct (talking about experience with Fosi). This way, a customer in any corner of the world could fix their device to a certain degree and the whole purchase and experience isn't a write-off..

(keep MacOS users in mind)
What kind of firmware do you expect to find in a fully analog power amplifier? There's nothing programmable inside these boxes. :)
OK, @Inertiaman was faster than me.
 
Alright, A7 team, we're in a price range slightly below the Hypex NC122MP and Denon X1800H, both of which have a built-in PSU.

My Wiim Ultra just arrived, but I haven’t opened it yet because I’m waiting for an amp.
Now I’m starting to question whether it’s worth it, since the Wiim Ultra + 3e Audio is already more expensive than an AVR like the Denon X1800H.
I’m wondering if there will be an audible difference.
 
Alright, A7 team, we're in a price range slightly below the Hypex NC122MP and Denon X1800H, both of which have a built-in PSU.

My Wiim Ultra just arrived, but I haven’t opened it yet because I’m waiting for an amp.
Now I’m starting to question whether it’s worth it, since the Wiim Ultra + 3e Audio is already more expensive than an AVR like the Denon X1800H.
I’m wondering if there will be an audible difference.
Well yes, you are quite right to ask now that finally we have some pricing information.

The 'devil is always in the detail'. So pricing with import tax included or not, postage etc. ?? And any early bird discounts etc.
Two monos are showing as approximately 420 euros for me in France with that address set ... but we will just have to wait for those details, as excluding tax and postage that mono price level I am seeing is indeed looking rather steep.
 
Two monos are showing as approximately 420 euros for me in France with that address set ... but we will just have to wait for those details, as excluding tax and postage that mono price level I am seeing is indeed looking rather steep.
+1 to that, I wanted to write exactly the same (I am in Hungary so I will have to pay even more customs if it is not dealt with by the seller like in the case of hifigo.com and hifiexpress.com)
 
I'd be surprised if they didn't. TI explicitly specifies the SE configurations for loads down to 2 ohm. Power scales almost linearly down to 2 ohm.
View attachment 413182
The SE configuration is more suitable for lowish loads than BTL (which 3e Audio do not offer), but is of course less powerful than PTBL. I don't see a reason why the A7se should perform any worse than the evaluation board, quite the contrary.


What kind of firmware do you expect to find in a fully analog power amplifier? There's nothing programmable inside these boxes. :)
OK, @Inertiaman was faster than me.
Haha. Yes. My bad. Inertiaman, ironically, moved really fast on that one :)

I was posting and reading about a bunch of issues I was having and so was in that head space. Forgot that this here was a pure power amplifier.
 
I'd be surprised if they didn't. TI explicitly specifies the SE configurations for loads down to 2 ohm. Power scales almost linearly down to 2 ohm.
View attachment 413182
The SE configuration is more suitable for lowish loads than BTL (which 3e Audio do not offer), but is of course less powerful than PTBL. I don't see a reason why the A7se should perform any worse than the evaluation board, quite the contrary.


What kind of firmware do you expect to find in a fully analog power amplifier? There's nothing programmable inside these boxes. :)
OK, @Inertiaman was faster than me.
it doesn't matter SE(1FET) or BTL(2FET) config but the limitation is the OCP of TPA32xx itself, i remember is 17A max per-bridge(FET). that is why PBTL will double the current, in theory it can support any load if not trigger OCP, the datasheet listed is to aim the rate power that ti expect to achieve.
 
for EU member, we suggest buy from audiophonic.
we don't have Amazon yet but this is the plan of 2025.
 
Archimago's part II finally landed.
Done with a 52 V / 9 A power supply even for the A7 Mono ...

it doesn't matter SE(1FET) or BTL(2FET) config but the limitation is the OCP of TPA32xx itself, i remember is 17A max per-bridge(FET). that is why PBTL will double the current, in theory it can support any load if not trigger OCP, the datasheet listed is to aim the rate power that ti expect to achieve.
Of course you are right, OCP defines the absolute limit (and I think 17 A is right).

In traditional amplifiers the doubling of the output resistance in bridged mode used to be another limiting factor, but that was mostly of interest for designs that could be used in bridges and non-bridged mode. The output filter of class D amps should be dominating the output resistance.

Anyway, just because a BTL configuration allows more power into higher loads doesn't mean it is better suited for lower loads. Luckily, your PBTL designs take care of that.
 
for EU member, we suggest buy from audiophonic.
we don't have Amazon yet but this is the plan of 2025.
When do you think it will be available at the Audiophonic store?
How about the discount for ppl who filled in the form?
 
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