@JanDH
I could be the one who did the most listening tests to different clock oscillators besides Doede. Based on my own experiences of the listening tests, I've found that the close-in phase nose, the phase noise floor and the phase noise in between (Leeson’s equation applied) are all significant to the sound quality. An oscillator can not achieve a higher grade sound quality if it doesn’t have good close-in phase noise even though its noise floor is great. On the other hand, a good close-in phase noise oscillator can also sound a bit fat, less sound stage any dynamic if the noise floor or the phase noise in between are not great.
Ian
I could be the one who did the most listening tests to different clock oscillators besides Doede. Based on my own experiences of the listening tests, I've found that the close-in phase nose, the phase noise floor and the phase noise in between (Leeson’s equation applied) are all significant to the sound quality. An oscillator can not achieve a higher grade sound quality if it doesn’t have good close-in phase noise even though its noise floor is great. On the other hand, a good close-in phase noise oscillator can also sound a bit fat, less sound stage any dynamic if the noise floor or the phase noise in between are not great.
Ian
Hello, i just recieved my TransportPi Digi today, really pleased with the difference it made over USB, the accusilicon clock improved things further a bit but not to the degree the transport pi digi did
tho this is just my first expression, nothing is burned in yet and i use toslink instead of coax
a few questions:
1. Can i improve things further with the IsolatorPi ?... some people dont like it but if the transportpi digi is reclocking the signal and the rpi is completely galvanicly isolated shouldnt this mean that output can just improve instead of degrade?
2. As i switched to the Accusilicon clock i noticed the socket feels kinda lose, even if its just the first swap by myself, should i worry aboout this? are the legs from the accusilicon clock thinner?
3. are there any measurements done ? specially i would like to know how toslink compares to coax, specially jitter-wise since its the biggest problem with toslink
4. i had now 2-3 times a slight pop on the left speaker if switching songs, is this a common problem with the transportpi digi?
tho this is just my first expression, nothing is burned in yet and i use toslink instead of coax
a few questions:
1. Can i improve things further with the IsolatorPi ?... some people dont like it but if the transportpi digi is reclocking the signal and the rpi is completely galvanicly isolated shouldnt this mean that output can just improve instead of degrade?
2. As i switched to the Accusilicon clock i noticed the socket feels kinda lose, even if its just the first swap by myself, should i worry aboout this? are the legs from the accusilicon clock thinner?
3. are there any measurements done ? specially i would like to know how toslink compares to coax, specially jitter-wise since its the biggest problem with toslink
4. i had now 2-3 times a slight pop on the left speaker if switching songs, is this a common problem with the transportpi digi?
Last edited:
I have compared AS318B 45/49 with AS318B 90/98 and there is no difference in sound
Unless you don't have FIFOPI Q3 or Q7, you don't need IsolatorPi, because it is already integrated in Q3 or Q7. In addition, in the early FIFO with IsolatorPi, the sound quality has not improved significantly, maybe there is very little noise in my system.
Since all components will be connected together through the ground, the noise of all components will be transmitted to each other through the ground and interfere with each other. The real solution is to eliminate noise, not to isolate it, because it cannot be truly effectively isolated. The most effective means of eliminating noise without side effects is the grounding box that everyone does not believe in, or using an independent grounding system, the kind used by lightning rods
Since all components will be connected together through the ground, the noise of all components will be transmitted to each other through the ground and interfere with each other. The real solution is to eliminate noise, not to isolate it, because it cannot be truly effectively isolated. The most effective means of eliminating noise without side effects is the grounding box that everyone does not believe in, or using an independent grounding system, the kind used by lightning rods
@wcwc
The first revision of FifoPi should be exactly the same as FifoPiQ3 except it has a LDO on the clean side to take 5V.
Just hope this comparison chart helps
Ian
The first revision of FifoPi should be exactly the same as FifoPiQ3 except it has a LDO on the clean side to take 5V.
Just hope this comparison chart helps
| FIFO comparison | FifoPiMa | FifoPi Q3 | FifoPi Q7 |
| Key features | High performance good price | Advanced | Flagship |
| Mode | Master | SYNC | SYNC |
| Low jiter MCLK output | Yes | Yes | Yes |
| Engine Architecture | N/A | 16 Bit | 32 Bit |
| Fifo Memory | None | 64Mbit | 64Mbit |
| I2S/DSD Reclocker | 2 stages discrete 1-bit low-noise reclockers | 1 stage multi-bits reclocker | 3 stages discrete 1-bit low-noise reclockers |
| Built-in Isolator | None | Yes, with integrated isolator | Yes, with discrete isolators for the best possible isolation performance and lowest EMI leakage |
| Output signal quality | ultra-low noise, almost perfect signal quality | Signal quality is great but still has chance to improve by installing a ReClockPi | ultra-low noise with isolation, almost perfect signal quality |
| PCM input/output | 384KHz | 768KHz | 768KHz |
| DSD input/output | DSD 128 output only | DSD1024 input/output | DSD1024 input/output |
| DoP input/output | DoP Decode/pass through | DoP Decode/pass through | DoP Decode/pass through |
| Linux driver | Need | No Need | No Need |
| XO sockets | Yes, upgradable | Yes, upgradable/swappable | Yes, upgradable/swappable |
| Work with RPi | Yes | Yes | Yes |
| Work USB | No | Yes | Yes |
| Work with S/PDIF or I2S over HDMI | No | Yes | Yes |
| StationPi Pro External Controller | No support | Yes | Yes |
| MonitorPi OLED controller over GPIO | Works with MonitorPi but no control function | Works with MonitorPi but no control function MonitorPi works in isolation mode | Yes, Works with MonitorPi for both control and monitoring functions, MonitorPi works in isolation mode |
| Continuous clock mode | Yes, PCM only | No | Yes, both PCM and DSD |
| Clean Side power supply | 3.3V /Ultracapacitor/battery | Isolated 3.3V /Ultracapacitor/battery | Isolated 3.3V /Ultracapacitor/battery |
| XO frequencies support (MHz) | 22/24, 45/49 | 5.6/6.1,11/12,22/24,45/49,90/98 | 5.6/6.x,11/12,22/24,45/49,90/99 |
| Delay Time | No delay | fixed 0.2s delay time for all Fs, Keeps constant for all Fs | Programmable delay time between 0.1s - 1s, Keeps constant for all Fs |
| 16 to 32 bit loss converter | Yes, can be enable/disable | Yes, can be enable/disable | Yes, can be enable/disable |
| Work with SinePi | Yes | Yes | Yes |
| Bitperfect | Bitperfect | Bitperfect | Bitperfect |
| Size and dimension | Same and compatible | Same and compatible | Same and compatible |
| Price | Lower | Higher | Even higher |
Ian
have a problem.
have an ian canada isolator II with a FIFO Ma 1.5 on top.
as dac a Balanced DAC Board 2x PCM1794A I2S 24bit 192kHz.
https://www.audiophonics.fr/en/dac-...ard-2x-pcm1794a-i2s-24bit-192khz-p-16527.html
the problem is that with volumio only sound comes out if i set audio resampling to 192 Khz.
with spotify plugin hardly any sound comes out.
a philips tda 1543 dac for this and that worked well.
Do I have something wrong, am I missing something or is it related to the software.
have the settings and voltages according to the manual.
I also bought other clocks right away.
what strikes me as soon as spotify starts playing, the recclocker switches to another clock and almost no sound comes out, not even the old clocks.
spotify is the biggest problem for me then.
have an ian canada isolator II with a FIFO Ma 1.5 on top.
as dac a Balanced DAC Board 2x PCM1794A I2S 24bit 192kHz.
https://www.audiophonics.fr/en/dac-...ard-2x-pcm1794a-i2s-24bit-192khz-p-16527.html
the problem is that with volumio only sound comes out if i set audio resampling to 192 Khz.
with spotify plugin hardly any sound comes out.
a philips tda 1543 dac for this and that worked well.
Do I have something wrong, am I missing something or is it related to the software.
have the settings and voltages according to the manual.
I also bought other clocks right away.
what strikes me as soon as spotify starts playing, the recclocker switches to another clock and almost no sound comes out, not even the old clocks.
spotify is the biggest problem for me then.
Last edited:
the transport pi digi doesnt have isolation as far as i know
while you are right that its best to eleimate noise at the source i think isolation can still help, specially if we talk about the transition from a computer to a ddc, no?
i will probably get the isolationPi on my next audiophonics order, it isnt too expensive and i dont think it can make the sound "worse" either it does little/nothing or it does improve the situation to some degree right?
posting these again since nobody addressed them, specially 4. i would like to elimate if this is possible
the pop i hear is always on the left channel, but it doesnt happen consistently, maybe every 30-60minues once
I installed FusionDsp and from there set resample to 192000 kHz ..... now Spotify has a normal volume and now plays fine.
I'll look at it for a while but now the problem is gone.
I'm still in read-only reverse diyaudio culture mode so I'm off my game and not in sync.
But I noticed GB2023 just now, so I logged-in.
For soldering station, I recommend one with enough high temp because Ian makes solid quality products that sometimes they are double-layered for quality purposes. Thus, you will need high temps to do right. I'm Ersa, but I'm a simp. Other diy'ers may have better recommendations but Ersa for I is premium enough for my simple needs. But if you plan to be hardcore, I'm sure there are Industrial Strength options.
I also use exclusively Mundorf Silver/Gold solder and Neotech Solid Core Cooper/Silver wiring to keep consistent with all my other non-Ian Audio gear.
I'm not a half measures type, but only full measures so YMMV.
I'm hoping to wrap up on my first UcPure go around next weekend.
But I noticed GB2023 just now, so I logged-in.
For soldering station, I recommend one with enough high temp because Ian makes solid quality products that sometimes they are double-layered for quality purposes. Thus, you will need high temps to do right. I'm Ersa, but I'm a simp. Other diy'ers may have better recommendations but Ersa for I is premium enough for my simple needs. But if you plan to be hardcore, I'm sure there are Industrial Strength options.
I also use exclusively Mundorf Silver/Gold solder and Neotech Solid Core Cooper/Silver wiring to keep consistent with all my other non-Ian Audio gear.
I'm not a half measures type, but only full measures so YMMV.
I'm hoping to wrap up on my first UcPure go around next weekend.
Ian,
I noticed there is a
https://www.diyaudio.com/community/threads/greater-toronto-area-diy-meetup.212618/page-79
EDIT:
Nevermind, it's an old thread. Summer meetup is just a twinkle in the eye right now with less than a handful of people interested. So ignore...
I noticed there is a
Greater Toronto Area DIY meetup
here:https://www.diyaudio.com/community/threads/greater-toronto-area-diy-meetup.212618/page-79
EDIT:
Nevermind, it's an old thread. Summer meetup is just a twinkle in the eye right now with less than a handful of people interested. So ignore...
Last edited:
I found that the brand of ufl connectors makes a hugh difference in user friendliness. I'll try to look up my past order for the brand.
I struggled hard with ufl connectors, but once switching brands it's basically plug-and-play.
One clock i tried with very good result and very low phase noise,and drop in replacement. https://www.aliexpress.com/item/100...dfa33090f41cbb78fffb26c2a240d&ck=in_edm_other
Another way to go if you have Symmetricon sattellit GPSDO with antenna 10mHZ input,PLL card and sinepi.Still have it in my drawer,but going to try soon,also put low pass filter before input card minimise jitter.But mayby the PLL card create to much jitter,but you never now the sound until you have tried. https://www.ebay.com/itm/3144932361...55&cnvId=700003&recoId=314493236152&recoPos=5
Last edited: