In my opinion STA326 is much better implemented in JC-SZ80A, than FX-Audio D802. In addition, there is the possibility of using a passive subwoofer (2.1 option)
They don't actually us the same chip. The JC uses the STA326 while the D802 uses the ST350BW. See posts around #20 for comparisons (although read carefully as some stuff was mixed up).
I haven't tried the JC as the reported input signal limitation of 48kHz ruled it out for me - I have a lot of 96 and some 192 Khz source.
16bits 48khz 8homs
frequency response and phase d310 tweak d.sound
with eq
h 22hz q0 0.5 db 2.5
h 850hz q0 0.75 db -1.5
h 1,6khz q0 0.75 db -1.5
h 3khz q0 0.75 db -1.5
qa100 qls response
d802 response
d8 response
v200 response
0.012% thd at 1w 1khz for the d310 tweak very very good....better than nad M2
0.022% for the qa100
very bad for the d802
bad to for the d8
0.016% for the v200
frequency response and phase d310 tweak d.sound
with eq
h 22hz q0 0.5 db 2.5
h 850hz q0 0.75 db -1.5
h 1,6khz q0 0.75 db -1.5
h 3khz q0 0.75 db -1.5
qa100 qls response
d802 response
d8 response
v200 response
0.012% thd at 1w 1khz for the d310 tweak very very good....better than nad M2
0.022% for the qa100
very bad for the d802
bad to for the d8
0.016% for the v200
Thanks for publishing these Globulegl. much appreciated.
Am I misunderstanding the charts though? The THD figures do not seem to correlate to the arithmetical totals of the individual harmonics, even allowing for some rounding effects.
Taking the numbers as published may I look selectively at the performance of the D802 (as this amp interests me)? I notice the distortion from this is almost entirely 2nd order and with this excluded the 802 has the lowest THD of the selection here - which if I subscribe to the theory that it is only odd and higher order distortions that are objectionable would correlate with my subjective preferences. I do notice though that for this amp the high order 6th and 9th order products don't fit the usual declining pattern but stay fairly high at 0.01%. Are you confident with these numbers?
Am I misunderstanding the charts though? The THD figures do not seem to correlate to the arithmetical totals of the individual harmonics, even allowing for some rounding effects.
Taking the numbers as published may I look selectively at the performance of the D802 (as this amp interests me)? I notice the distortion from this is almost entirely 2nd order and with this excluded the 802 has the lowest THD of the selection here - which if I subscribe to the theory that it is only odd and higher order distortions that are objectionable would correlate with my subjective preferences. I do notice though that for this amp the high order 6th and 9th order products don't fit the usual declining pattern but stay fairly high at 0.01%. Are you confident with these numbers?
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Are the distortion figures of the D802 really "very bad"? Or are they just worse than the other amps?
Well we are into subjective judgments here 🙂
The THD for D802 is shown as 0.16%, this is indeed worse than the other amps, although its a bit harsh to call anything below 1% very bad I think.
However look more closely. Of that 0.16% THD 0.159% is 2nd harmonic which is often regarded as benign unless at very high (5 -> 10%) levels. The remaining 3rd and higher order distortion on the 802 is actually *better* than all the other amps so you tell me which, from the figures, is likely to sound the best. As regards measuring best or worst , that depends on what you are judging it on.
16bits 48khz 8homs
frequency response and phase d310 tweak d.sound
with eq
h 22hz q0 0.5 db 2.5
h 850hz q0 0.75 db -1.5
h 1,6khz q0 0.75 db -1.5
h 3khz q0 0.75 db -1.5
qa100 qls response
d802 response
d8 response
v200 response
0.012% thd at 1w 1khz for the d310 tweak very very good....better than nad M2
0.022% for the qa100
very bad for the d802
bad to for the d8
0.016% for the v200
Thanks for the work.
I just want to know what digital input did you use. For me, I have D802 and I found the spdif input sounds better than the USB input. And 192khz (red book upsample by HQplayer) input definitely sound better than 44khz with the spdif.
Maybe you can do another one compare various sampling rates input.
i use the toslink .
below 200Hz measurement is poor because i have a problem with the sound card converter
below 200Hz measurement is poor because i have a problem with the sound card converter
I would like to set up a small DAC/amp/speaker combination just for TV/blu-ray audio playback, stereo only. Since my sources will be exclusively s/pdif, these amplifiers seem a good choice.
My speakers are Aura NS3-193 (4ohm version) which I intend to install in 1.5 litre sealed boxes; this should be nice and compact.
Would the D802 or JC-SZ80 work well with these 4 ohm speakers, or would the 8 ohm version of the NS3-193 be a better match?
My speakers are Aura NS3-193 (4ohm version) which I intend to install in 1.5 litre sealed boxes; this should be nice and compact.
Would the D802 or JC-SZ80 work well with these 4 ohm speakers, or would the 8 ohm version of the NS3-193 be a better match?
I got my Fx d802.
Did the Diana Krall test (Flac).
She never sounded better!
Compared to TPA3118D2 this a step up!
Just running it flat to my TB W8-2145 and dont feel to eq anything!
Love the the top end!
Only problem i can hear is some noise,if I turn down the input volume its not black?
Toslink in via ES9018K2.
Did the Diana Krall test (Flac).
She never sounded better!
Compared to TPA3118D2 this a step up!
Just running it flat to my TB W8-2145 and dont feel to eq anything!
Love the the top end!
Only problem i can hear is some noise,if I turn down the input volume its not black?
Toslink in via ES9018K2.
I don't know those drivers, but the amps should be fine for both 4 or 8 ohm speakers.
According to the STA326 specs the standard 24V power brick supplied with the amps should be pretty ideal for the 4 Ohm drivers so OOB that would seem the best option. A little more could be obtained into 8 Ohm but for that you would need to use a higher voltage supply.
Yes its close up to computer table.
Also when listening to Spotify when next tune comming it mute downs pretty uggly to silence and sparkle up to next.
So,its not perfect but sounds very good!
To bad its to much noise.
Yes, I hear it in queit recordings.
And what can I do when running at Toslink,USB and have volume at max?
Bad implementation?
FX Audio D802 HiFi Digital Amplifier USB Optical Fiber Coaxial Input 192kHz 80W | eBay
Yes, I hear it in queit recordings.
And what can I do when running at Toslink,USB and have volume at max?
Bad implementation?
FX Audio D802 HiFi Digital Amplifier USB Optical Fiber Coaxial Input 192kHz 80W | eBay
Ah. I was wondering why you hear this noise when I hear nothing.
I listen through co-ax spdif rather than optical myself, although I don't remember any noise on optical from the time I tested it and, logically I wouldn't expect a difference.
If you have the volume turned up to max that would explain it though as you would be applying very high gain to background noise, I suspect you are using software volume control at the source (which severely impairs s/n ratio) then amplifying it to the max afterwards. Best would be to supply 0db signal from the source (i.e. no attenuation). If you really absolutely must apply source attenuation then I'd say first supply 0db and adjust the amp to whatever represents your loudest required listening level. Then leave it at that setting (probably this will be around 20) and apply your source digital attenuation as needed leaving the amp set at 20.