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3e Audio SY-DAP2002 Review (DSP Amplifier)

Joined
Jul 25, 2020
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#61
any codecs are about the particular BT module in use +/-$2, unfortunately, all of these codecs are lossy-compressed, and "HD" just a nickname without connection to reality.
respice finem was 100% right, the most challenging thing is a high power density design with minimal EMI disturbances from SMPS to class D and to the frontend etc. One BT module to another one I think can change my 8 years old son ;)
I believe the (yes lossy) HD formats has been confirmed to sound better than old SBC? standard. I dont know if there is audiably difference between "HD" and non-lossy HD. Aptx HD is already more than 4 years old. LDAC and a newer one are licence-free as far as I remember. Not sure
Cheers!
 

buz

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#62
I have my dusty HiFiTOY proto PCBA 120x93mm. For the moment almost abandoned project but if I'll get the app.info for the Qualcomm PWM modulator I can wake it up and finalize.
https://e1dashz.wixsite.com/index/hifitoy
That looks very interesting especially the bit about DSP, any chance we can get a decent headphone amp with DSP while we are at it?

Edit: overlooked the PowerDAC v2, that might be close to what I am looking for.

As for the bluetooth codecs, LDAC and aptx-HD are quite acceptable (SBC very much is not).
 
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respice finem

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#63
This thing does not have a brick psu , that would be easier for them just buy an approved psu ?
I never said they shouldn't. Yet, for what it is now and for its end user, it's still a bit safer to have a [email protected] brick embodied in plastic than its ingredients in a metal housing. I'm seeing it this way because I grew up in an "AC only hurts when you can smell it" era, Poland in the 70s to 90s, if I told you what was "normal" then you wouldn't believe... :eek:
 
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Joined
Jul 25, 2020
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#64
any codecs are about the particular BT module in use +/-$2, unfortunately, all of these codecs are lossy-compressed, and "HD" just a nickname without connection to reality.
respice finem was 100% right, the most challenging thing is a high power density design with minimal EMI disturbances from SMPS to class D and to the frontend etc. One BT module to another one I think can change my 8 years old son ;)
Put chip w HD codec in your wondermashines and eat the loss. Otherwise your stuff looks awesome
 

Bruce Morgen

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Aug 3, 2019
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#65
Amplification is provided using the ST Micro TPA3255 chip.
AFAIK, TI is still the sole source for the TPA3255. Other, older TI-originated parts -- e.g. the classic NE5532 op-amp -- are available from other manufacturers, but the TPA3255 has only been around for about 5-6 years and (again, AFAIK) remains a TI exclusive.
 

spacevector

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#66
Something I just noticed: The 5W dashboard for op-amp replacement case is 5V rms instead of W. So actual power is 6.25W for the test instead. Actual SINAD performance is likely 1dB worse.

1613092413021.png

1613092445667.png


/hairsplit
 

3eaudio

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Manufacturer
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Nov 8, 2018
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#67
here are final data from us test with 8ohm.
  • SINAD-5W-8R-DAP1002
SINAD-5W-8R-DAP1002.JPG



  • SINAD-5W-8R-DAP2002
SINAD-5W-8R-DAP2002.JPG



  • THD+N Ratio vs Output Power
THD+N Ratio vs Measured Level-2.jpg
 
Joined
Aug 16, 2020
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#71
yes,capacitor modified with NE5532 opamp.
I wonder what the measurements would look like with the capacitor mod + the opamp Amir used. I have OPA1612 in my own unit.

Do you know if it's possible to change the volume control to a logarithmic one, and how I would to so to the amp?
 
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