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post #6571 of 8262

@AnilKumar You need may be just a bit more time to get accustomed to the interface.

post #6572 of 8262

Hi Guys,

Cables usually have nearly 10pF or higher  of capacitance. I am not sure about total impedance though because there are many reflection point in the path (eg. connection, solder points in earphone etc). Question is ..will it cause any reflection resulting due to impedance mismatch between source and destination for signal bandwidth of 20Hz to 20KHz, answer is yes...it will cause reflection but can my human ear (not measurement tool)  detects  little  unintended bump in signal..No. I am getting old !!!.

But there are people with golden ear , they may hear it. I am still trying to understand how to distinguished between open or closed soundstage ....may be one day.

I do design silicon circuit for 2Gbps signal for living, I know signal and its characteristic well.

post #6573 of 8262

This is my second DX90 and previous one did not have this issue. I do have this for 3 weeks now.

I will keep trying to get used to it.

post #6574 of 8262
Quote:
Originally Posted by AnilKumar View Post
 

Hi Guys,

Cables usually have nearly 10pF or higher  of capacitance. I am not sure about total impedance though because there are many reflection point in the path (eg. connection, solder points in earphone etc). Question is ..will it cause any reflection resulting due to impedance mismatch between source and destination for signal bandwidth of 20Hz to 20KHz, answer is yes...it will cause reflection but can my human ear (not measurement tool)  detects  little  unintended bump in signal..No. I am getting old !!!.

But there are people with golden ear , they may hear it. I am still trying to understand how to distinguished between open or closed soundstage ....may be one day.

I do design silicon circuit for 2Gbps signal for living, I know signal and its characteristic well.

Then, you should know this fundamental fact.  Reflections are caused when there is a significant difference from the wavelength to the length of the cable.  This is audio frequencies, and there will be no reflection within the cable length used. You may want to look up electrical signal reflections and transmission line theory. "Impedance mismatch" is a term used for transmission line theory, and it's used for power delivery.  If it's not matched, the power delivery is not max.  For complex values of the impedance, impedance match will negate the reactive components when matched.


Edited by SilverEars - 7/2/14 at 6:19am
post #6575 of 8262

I fully agree with your opinion. Even if there is no significant difference between wavelength and  cable-length, your will see small reflection if you are using square wave for measurement. Reflection may not come back right away before you send next signal, it will come back later and distort it. In digital signaling, source  is strong enough to compensate it.  Measurement tool what I use are designed for extremely sensitive and they detect very minute reflection...in real life (using my ear), I can not detect it. 

 I am not trying to change anyone's opinion.  I am humbly trying to understand what I am missing in my audio setup to make my ear happy and giving input based on my experience as lead DDR3 design engineer for a big microprocessor company.

post #6576 of 8262
Did any of you order from eglobalcentral? They have very sharp prices. Gonna order the ibasso dx90 from there and later the sennheiser ie800 hmm
post #6577 of 8262

Things may still beat in complex signals but that said, perhaps reflections aren't the mechanism that causes a sonic difference. There's really no way to be certain but my experience is that connectors and cables sound different and that I prefer those of correct or neutral impedance without multiple ground paths. There is also not enough resistance, capacitance or inductance in them for a measurable in band difference either. It's unfortunate that our ears are still more sensitive and comprehensive than test kit. Or maybe fortunate.:wink_face: 


Edited by goodvibes - 7/2/14 at 7:31am
post #6578 of 8262
Quote:
Originally Posted by mochill View Post

I bought it from your seller and now it is still say charging and has been about 20hrs😞

I had exactly the same problem with my battery, purchased from the same seller. I even put it in an SIII with the same result.

My guess is that like most all batteries sold on eBay, it is not genuine. I filled out the "Report a Problem" link on eBay and explained the problem to the seller. Within an hour I received a full refund without any kind of response or explanation, which leads me to believe they know they are not genuine.
post #6579 of 8262
Quote:
Originally Posted by Migou67 View Post
 

@AnilKumar Have you installed the latest firmware 2.05 ? It improve the response of the touch screen (less sensitive).

 

 

Quote:
Originally Posted by AnilKumar View Post
 

Thanks for quick response. Yes, I have applied new firmware. It did not help. :(


Actually, the original FW was less sensitive. It's usually just a matter of getting accustomed to the screen and what a tap vs a swipe feels like.

post #6580 of 8262
Quote:
Originally Posted by jj69 View Post


I had exactly the same problem with my battery, purchased from the same seller. I even put it in an SIII with the same result.

My guess is that like most all batteries sold on eBay, it is not genuine. I filled out the "Report a Problem" link on eBay and explained the problem to the seller. Within an hour I received a full refund without any kind of response or explanation, which leads me to believe they know they are not genuine.


I think they are genuine from that seller or at least the ones I got appear so. It's possible it may have been sitting dead too long or just defective. I'd try giving it a kick start with a 2a charger.

post #6581 of 8262
I also opened up a case for that seller and just got a instant refund with no explanation, maybe they are bad😞
post #6582 of 8262
Quote:
Originally Posted by mochill View Post

I also opened up a case for that seller and just got a instant refund with no explanation, maybe they are bad😞

they are mobsters wink.gif
post #6583 of 8262
Well I'll be using my pisen battery 😃
post #6584 of 8262
Quote:
Originally Posted by AnilKumar View Post
 

Hi Guys,

 

Touchscreen of  DX90  is too sensitive making almost impossible to scroll and select a directory.  Scrolling down is very tough. Have you guys noticed this issue too..if yes then is there any fix for it.

I do have screen protection (supplied with Ibasso) on it.

 

I bought DX90 from ProStudio (Through Amazon) and shipping was fast . I am happy with them.

 

 

Thanks for your help,

Anil 

 

 

You're using your finger rather than a stylus, right? I've tried using a stylus to scroll, and it's impossible.

 

I initially had the same scrolling problem you did (using my finger), but with a little practice I was able to get it figured out. It does take a bit of a measured touch, but I'm sure you'll get the hang of it before long.


Edited by bigsix - 7/2/14 at 12:26pm
post #6585 of 8262
Thread Starter 

I have 5 of the batteries that are marked Samsung from the seller on eBay. They all charge up fine in the Anker battery charger I got or in the DX50 or 90. They all sound better than the original battery or the Anker battery. And they all have solid printing, a clean finish to the batteries outside and individual serial numbers. I wonder if the eBay seller got a bad batch, has some bad batteries mixed with good. Whatever the case, it is unfortunate that he is sending out some batteries that are bad and I am sorry that more have not received good batteries, as they do make a difference, a positive one, IMO. 

 

 

My screen seemed too sensitive after the last fW and I did a factor reset. Now it is just right. 

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