May be you can have a look to this thread...
http://www.diyaudio.com/forums/class-d/269142-class-d-amp-i2s-input.html
http://www.diyaudio.com/forums/class-d/269142-class-d-amp-i2s-input.html
@ coolmint : I think the power supply included is a good one and it'll not be really improved with another one...
I tested 3 different units of DDX or DACAmps or whatever the name of these PCM to PWM converters through their coaxial input, the I.AM.D V200, the FX-D802 and the YJHiFi.
The FX-D802 and the YJHiFi use the same chip, the STA326, but the second has a separate sub output, with a free cut-off frequency. The sound is quite the same, but obviously you'll largely improve the audio result using an additional sub-woofer ! Since the YJH is sold without any PS, and is sold much cheaper han the FX, I used the PS of the FX without any issue.
The V200 is more powerful than the 2 others and uses a TI chip. I found the audio quality is somewhat improved with this device, despite some sibilances from time to time depending on the recordings !... The soundstage, the ambient of the recording place, the realism and some very fine details of the music and vocals are improved.
Anyway, both chips remain very good compared with several high-end "classical" DACs !
I tested 3 different units of DDX or DACAmps or whatever the name of these PCM to PWM converters through their coaxial input, the I.AM.D V200, the FX-D802 and the YJHiFi.
The FX-D802 and the YJHiFi use the same chip, the STA326, but the second has a separate sub output, with a free cut-off frequency. The sound is quite the same, but obviously you'll largely improve the audio result using an additional sub-woofer ! Since the YJH is sold without any PS, and is sold much cheaper han the FX, I used the PS of the FX without any issue.
The V200 is more powerful than the 2 others and uses a TI chip. I found the audio quality is somewhat improved with this device, despite some sibilances from time to time depending on the recordings !... The soundstage, the ambient of the recording place, the realism and some very fine details of the music and vocals are improved.
Anyway, both chips remain very good compared with several high-end "classical" DACs !
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@ ondesx, thank you for your feedback. I have the D802 and I have to raise the volume on it in the range of 40-44 to get living room listening levels with my vintage 89dB/300W rated 8ohm speakers. i know that the power ratings of amplifiers in general aren't always quite what is published. i wondered if the sound/power could be increased with a better psu for D802 but it looks like not. i've read about the V200, i wonder if it's worth returning the D802 for it. but sibilance, more for the V200 than the others it seems? maybe i will try to build a Sure AB32313 rated at 400W, whatever that 400 means.
400 watt in real world is 2x117 watt in 3 ohm. No further information is available on parts express homepage!
This can be translated to something around 2x70 watt in 6 ohm and little less in 8 ohm.
The claimed 400 watt are quite ordinary in real world.
This can be translated to something around 2x70 watt in 6 ohm and little less in 8 ohm.
The claimed 400 watt are quite ordinary in real world.
Well, be very careful with the power reached by these amps... The Class D often suffers of a very high distortion as soon as the power raises.
The lower the use the lower the distortion !...
As for the V200, Coolmint, you really have to try it. I think you'll really improve your listening, much more than changing the PS of the 802. The sibilances aren't an issue for good recordings. I'm afraid these are an evidence of a poor recording in fact...
The lower the use the lower the distortion !...
As for the V200, Coolmint, you really have to try it. I think you'll really improve your listening, much more than changing the PS of the 802. The sibilances aren't an issue for good recordings. I'm afraid these are an evidence of a poor recording in fact...
Did anyone tried ALIENTEK D8. Any thoughts.
https://de.aliexpress.com/item/ALIE...id=0af2031b-93cd-40be-b6ce-096b193b0939&tpp=1
https://de.aliexpress.com/item/ALIE...id=0af2031b-93cd-40be-b6ce-096b193b0939&tpp=1
It seems the D8 uses the STA328 chip, i. e. the same or close to the 326. The difference is that the 328 hasn't an USB input and is now an obsolete component for ST.
It'll sound like the FX provided the output filter is correctly designed and implemented.
It'll sound like the FX provided the output filter is correctly designed and implemented.
That is an assumption. If one is using USB input this D8 might be better than D802 because of the XMOS USB board. STA328 does not have USB input but that is not an issue as the D8 has the XMOS for that. STA328 being obsolete does not say much. STA326 will be obsolete too. Beware not to buy the PCM2704 version.
If it has something better than the XL2596 (like in the D802) to convert 28V to 12 etc. it might be a good competitor.
If it has something better than the XL2596 (like in the D802) to convert 28V to 12 etc. it might be a good competitor.
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Yes it's an assumption. The only info I got for this D8 went from a web shop : one of the guys told me that there isn't much difference between these two units...
But the truth is that I didn't compare them !
But the truth is that I didn't compare them !
Can any owner of the FX Audio D802 share if the amp can take banana clips? They seem very small. Or has anyone upgraded that part of the amp?
yes the D8 is better than the d802 because the regulator is not xl2596 and the power is low noise. The distorsion is better.
mesurement
D802 tweak
xl2596 remplacement
2x 2200uf 16v
2x3300uf instead of 1800ufx2
after
mesurement
D802 tweak
xl2596 remplacement
2x 2200uf 16v
2x3300uf instead of 1800ufx2
after
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Yes it can. I have some quite substantial bananas currently plugged into mine, they look ridiculous compared to the size of the amp though 🙂
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That D8 looks very interesting. Judging by the pictures the xmos interface is on a daughter board so there might be easy access on the connector for i2s input, there are even a set of solder points next to the sta328 whose labels I can't read but *might* be connection points.
But reading the French forum the v200 upgrade (v400) is not too far away so I think I'll wait a bit and look at that first.
But reading the French forum the v200 upgrade (v400) is not too far away so I think I'll wait a bit and look at that first.
In order to compare the different FDAs-DACAmps or whatever their name, I built a "Magical Box" which is in fact a pad. The purpose was to listen to the outputs of these units directly through a pair of Headphones or IEMs.
A listening through a calibrated professional system with active monitors is paramount to make these comparisons, thus the use of a pad is also a good option.
I used several headphones and a Genelec system (with a pair of 1032A and 1094A subs) for these tests.
Most of the FDAs need an 8 ohm load : a 8.2 ohms and a 0.5 ohm on each channel are a good combination. Moreover, the use of any headphone even several in parallel is perfectly possible ! And the simultaneous usage of the active monitors system is also allowed...
After these tests, the first discover is the perfect silence when there isn't any modulation ! This is the case for all the tested units. The second observation is the very good conversion from digital world to analog, even when compared with very good DACs. Anyway, the V200 seems to be the best of my three units (the two others are the FX-802 and the YJHiFi).
I'll test other units as soon as I find a new one...
Stay tuned !
A listening through a calibrated professional system with active monitors is paramount to make these comparisons, thus the use of a pad is also a good option.
I used several headphones and a Genelec system (with a pair of 1032A and 1094A subs) for these tests.
Most of the FDAs need an 8 ohm load : a 8.2 ohms and a 0.5 ohm on each channel are a good combination. Moreover, the use of any headphone even several in parallel is perfectly possible ! And the simultaneous usage of the active monitors system is also allowed...
After these tests, the first discover is the perfect silence when there isn't any modulation ! This is the case for all the tested units. The second observation is the very good conversion from digital world to analog, even when compared with very good DACs. Anyway, the V200 seems to be the best of my three units (the two others are the FX-802 and the YJHiFi).
I'll test other units as soon as I find a new one...
Stay tuned !
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Agreed, its the reason I've stopped considering off-the-shelf DAC chips for advancing the art of D/A conversion.
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