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iBasso DX90. Dual Sabre, 1st page: Downloads, info & instructions- New dac software! & 2.1.5 FW.... - Page 471

post #7051 of 9345
Quote:
Originally Posted by Wishmasterx View Post
 


Difference in resistance between pure silver and tin/lead is very very high. When DX90j would be soldered with pure silver, I surely buy it :D

But there is no pure silver solder, but only high content silver soldering - like WBT high silver solder, that have 4% silver. I confirm, that it is too low for 170USD more.

 

Don't hold your breath for pure silver soldered DX90j.

 

The difference in resistance between pure silver (Ag) and tin/lead (63Sn37Pb is standard solder) is that Ag has 7.6 times better electrical conductivity than SnPb solder, measured in micro ohm per meter. Whether this is very very high is debatable.

The melting point of tin/lead solder is 183 deg Celsius whereas pure silver is 960.  At these temperatures the printed circuit board tracks will get damaged, and also not many electronics components can withstand such a temp during soldering process. Certainly not the SoC chip that DX90 has inside.  

post #7052 of 9345

I got the DX90 this morning. I'm still waiting for the SD cards to be delivered so just loaded some albums on the internal memory to give it a test.

 

Right from the start, I'm very happy with the sound. I'm in the office and only have my Mad Dogs 3.2 with me. I didn't expect them to work well straight out of the DX90 but it actually sounds really nice. However, once connected to my E12, the bass and dynamics noticeably improved.

 

I hope I'll get the SD cards in the mail today, otherwise I'll have to wait until next week to finish my portable setup, but I'm looking forward to playing around with it more over the weekend, with different headphones etc.

post #7053 of 9345
Quote:
Originally Posted by goodvibes View Post
 

Normal solder has 11.5% the conductivity of copper but modern lead free solders can contain 3% silver even if not noted and be higher. Typical 4% silver solder has 11.9% the conductivity of copper. That resistance is part of why you always want the best mechanical connections before soldering even if solder flows the joint. In the grand scale, silver to standard solder is a subtle difference in conductivity. 3% of something far off copper to begin with. When you consider the amount used on a pad or to surround a wire the effective differences become even smaller. That doesn't mean it will sound the same but why I question the amount of 'better' in this use. Not to say that I may not prefer the J version when available but it could be the other way as well. One also needs to remember that all the circuit work and voicing was done with the current solder.


The differences in resistivity and conductivity are not major.  But of course these are not the only factors.  Does the trace amounts of silver change the signal flow in a major way?  Many materials are "doped" with trace elements to make major changes in the characteristics.  I don't know enough of how silver could affect the conductivity to say anything meaningful, but I do postulate that there may be more going on than just the ratio of silver, how much tin and lead, etc.  We are more like the alchemists of the middle ages, looking for the secrets to turn lead to gold.  Trial and error is what we have, to see if there is a meaningful impact on SQ.

 

Regarding Jamato's comment about solder connections needing to be redone periodically, I believe in that.  I worked with industrial soldering/reliability, with telephone switches, and had a chance to see connections that had been in use for many years.  And while it takes a lot before the connectivity is lost, you can see how the solder joint looks different, and the joint is not as strong, after many years.  There is no doubt that solder oxidizes.  Just look at old copper water pipes..

post #7054 of 9345
Thread Starter 

Yes, solder does oxidize but I would think that it is also the reason that as tight a connection as possible, is so important so the the solder is more supportive rather than the primary conductor. Military soldering points used to be a wire wrap with the post being a sharp square post that you wrapped the wire around, tightly, so that you got a true metal to metal contact as free of gas (air) as possible and then you soldered this site. It will last a long time and with a solder seal, the actual joining should not oxidize, at least not for a long time. 

 

The mention of lead doesn't have much meaning in commercial use any longer since no one, that I know of, is using lead based solders. I still have some, lead/silver/tin of a couple of types but for personal use. I know that Xin had a hard time finding a solder he liked when commercial use of lead went away as the sound changed, and not to his liking. 

post #7055 of 9345
Quote:
Originally Posted by jamato8 View Post
 

Yes, solder does oxidize but I would think that it is also the reason that as tight a connection as possible, is so important so the the solder is more supportive rather than the primary conductor. Military soldering points used to be a wire wrap with the post being a sharp square post that you wrapped the wire around, tightly, so that you got a true metal to metal contact as free of gas (air) as possible and then you soldered this site. It will last a long time and with a solder seal, the actual joining should not oxidize, at least not for a long time. 

 

The mention of lead doesn't have much meaning in commercial use any longer since no one, that I know of, is using lead based solders. I still have some, lead/silver/tin of a couple of types but for personal use. I know that Xin had a hard time finding a solder he liked when commercial use of lead went away as the sound changed, and not to his liking. 

Yes, you are correct, that a good mechanical connection  is essential for any connection.  But for solder connections on a terminal block, they are not designed for a good mechanical connection, and the solder was a way to re-enforce the connection.  The wire wrap was a replacement method for the solder connection.  In my early work, I did hundreds of thousands of solder and wire wrap connections for telephone switches, so I consider myself an expert on connections.

 

For solder, it is good to make a good mechanical connection, but it is not possible to reproduce the high torque and multiple wraps, plus the square wire wrap pin, which is the system that was built to replace the solder joint.  So a solder joint still needs the solder to make the main connection.

post #7056 of 9345

Here's a question: Can the DX90 be used as a USB DAC? I thought it could, but when I connect it to my computer, it doesn't show up in the list of playback devices like other USB DACs that I have. Do I need to install something on the computer?

post #7057 of 9345
You need to download the drivers for your pc. No Mac support as of yet. And the on the DX90 you need to change to usb mode to dac in the settings menu
Edited by nc8000 - 7/17/14 at 10:15pm
post #7058 of 9345
Quote:
Originally Posted by nc8000 View Post

You need to download the drivers for your pc. No Mac support as of yet. And the on the DX90 you need to change to usb mode to dac in the settings menu

 

Cool, thanks for that. It would be easier if they included a manual... :o

post #7059 of 9345
Thread Starter 
Quote:
Originally Posted by ttt123 View Post
 

Yes, you are correct, that a good mechanical connection  is essential for any connection.  But for solder connections on a terminal block, they are not designed for a good mechanical connection, and the solder was a way to re-enforce the connection.  The wire wrap was a replacement method for the solder connection.  In my early work, I did hundreds of thousands of solder and wire wrap connections for telephone switches, so I consider myself an expert on connections.

 

For solder, it is good to make a good mechanical connection, but it is not possible to reproduce the high torque and multiple wraps, plus the square wire wrap pin, which is the system that was built to replace the solder joint.  So a solder joint still needs the solder to make the main connection.

Yes, in most cases, the solder is the conductor. I was a radioman in the Navy. That was in the days of tubes and point to point wiring. Plenty of soldering there and I built my first crystal radio when I was 7. I thought I was doing pretty good then a guy at work the other day told me he built his first tube radio at that age. lol

post #7060 of 9345

I just found a Japanese link for the instruction to replace the wallpaper in DX90: http://tmt481.blogspot.jp/2014/06/ibasso-dx90-wallpaper-kabegami.html

 

Basically you just have to place a 320 x 240 Wallpaper.png file in the root directory of internal memory with a graphic file of your choice.


Edited by borrego - 7/18/14 at 1:04am
post #7061 of 9345
Quote:
Originally Posted by borrego View Post

I just found a Japanese link for the instruction to replace the wallpaper in DX90: http://tmt481.blogspot.jp/2014/06/ibasso-dx90-wallpaper-kabegami.html

Basically you just have to place replace the 320 x 240 Wallpaper.png file in the .album_image directory with a graphic file of your choice.
http://www.head-fi.org/t/697316/ibasso-dx50-wallpaper-320x240-gallery
post #7062 of 9345

Lurker's DX90 FW2.1 modified with Roboto Condensed font and removed unused Android services: http://player.ru/showthread.php?t=132569&p=1440492&viewfull=1#post1440492

 

Download link: https://dl.dropboxusercontent.com/u/46851683/DX90/DX90FirmwareV2.1.0-Roboto-NoServices.zip

 

Google Translated Description:


Changes compared to the standard:

     Used font Roboto Consensed Attention: no characters will not be seen!
     Disabled unnecessary startup services Android.

The cumulative effect, in addition to changing the appearance, that player starts a little faster when the power and disabled services does not consume resources player (CPU time, memory, refer to the SD-card). Who player sometimes "stutters" when playing - can reduce stuttering.

Skacat Tut.

For those who really need, a list of disabled services:

     netd (internet services).
     debuggerd (interface debugger gdb, crash logs creates native applications)
     rild (serves wireless module) ..
     rild3 (serves wireless module).
     mediaserver (indexes media files and makes them available applications Android).

Obviously, none of them need not.

With such a firmware 2.0.5 on the basis of my player spent two weeks with no problems noticed (except for those that have and so in standard firmware).

 

Too bad the Roboto font does not support oriental characters well so I can't use it.


Edited by borrego - 7/18/14 at 12:44am
post #7063 of 9345

You need to place the file in the root of the internal memory
post #7064 of 9345
Quote:
Originally Posted by nc8000 View Post


You need to place the file in the root of the internal memory

 

Thanks for pointing this out! :beerchug:Have to correct my post


Edited by borrego - 7/18/14 at 1:04am
post #7065 of 9345
Quote:
Originally Posted by borrego View Post
 

Lurker's DX90 FW2.1 modified with Roboto Condensed font and removed unused Android services: http://player.ru/showthread.php?t=132569&p=1440492&viewfull=1#post1440492

 

Download link: https://dl.dropboxusercontent.com/u/46851683/DX90/DX90FirmwareV2.1.0-Roboto-NoServices.zip

 

Google Translated Description:


Changes compared to the standard:

     Used font Roboto Consensed Attention: no characters will not be seen!
     Disabled unnecessary startup services Android.

The cumulative effect, in addition to changing the appearance, that player starts a little faster when the power and disabled services does not consume resources player (CPU time, memory, refer to the SD-card). Who player sometimes "stutters" when playing - can reduce stuttering.

Skacat Tut.

For those who really need, a list of disabled services:

     netd (internet services).
     debuggerd (interface debugger gdb, crash logs creates native applications)
     rild (serves wireless module) ..
     rild3 (serves wireless module).
     mediaserver (indexes media files and makes them available applications Android).

Obviously, none of them need not.

With such a firmware 2.0.5 on the basis of my player spent two weeks with no problems noticed (except for those that have and so in standard firmware).

 

Too bad the Roboto font does not support oriental characters well so I can't use it.


I wonder if those services naturally close themselves after turn on when not finding conduits as it would on a PC? Still helps turn on but I wonder if it affects processor load once the FW is loaded. Maybe some do and some don't. I'm not that familiar with Android. Perhaps part of the Android agreement doesn't allow this sort of hack by the supplier. I wonder if the faster turn on of the mod has something to do with your fade in issue. Don't know but that one doesn't seem common to standard FWs.


Edited by goodvibes - 7/18/14 at 2:45am
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