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iBasso DX90. Dual Sabre, 1st page latest FW download & general information/instructions . . . . .... - Page 170

post #2536 of 7904
Perhaps at this point it's safe to say the first batch of DX90 will only ship as early as Monday, If nobody has gotten any confirmation yet especially for those guys who are in HK.
post #2537 of 7904
Quote:
Originally Posted by BaTou069 View Post
 

As certainly many of you, I'm deciding between the FiiO X5 and the iBasso DX90.

My portable headphone right now is the Shure SE846, a 9ohm impedance phone that needs low output impedance on the dap and a lot of current, not much load needed.

Both the X5 and the DX90 have less then 1ohm impedance, thats good. But how about the output current? Is the output stage comparable to a headphone amp made for iems, like the slim?

 

Thanks

 

So this is just a lot of guess work since I own neither at this point:


I think the output current of the X5 is 460mW into 16ohms (according to Fiio). I'm assuming Fiio capped it at 460mW, so it should still be that at 9ohms, which is A LOT for an IEM. It's almost half a watt. Your 846 will be thundering.

 

The voltage gain on both the DX90 and X5 is 2.8Vrms (according to spec). Assuming this is true, and ignoring that Chinese dude's measurements the DX90 has the potential to match the X5 in terms of current, but I'm not sure if Ibasso capped it lower than Fiio. I think they might have. If you're looking for max current I think X5. If you're looking at other sound quality factors, perhaps DX90?

 

Obvioiusly this is just a guess and nothing more than preliminary musing based on nothing. What's ironic is that the DX90 actually has the bigger voltage swing, which is 10v p-p, while the X5 does >8V p-p. Not sure why Ibasso capped it so low? perhaps to achieve those nice THD numbers?

 

To be perfectly honest I'm pretty much baffled by Ibasso's numbers. Why?

Because according to them the DX90 does +/- 5V,

which is 10 Vp-p

which means it should be doing 3.54Vrms at 32ohms and giving us 391mW at 32ohms (more than the X5)

Instead they say on High gain it's doing 2.8Vrms, but this Chinese dude is measuring it at 2.1Vrms. I'm assuming they capped the max current for headroom? Fiio's numbers actually align perfectly with their stated peak to peak values and what the dude measured, in fact it exceeds the numbers by a little bit.


Edited by M-13 - 4/11/14 at 2:52am
post #2538 of 7904
Just got a mail from iBasso and they have given a tracking number from Fardar???. Thank God they shipped it to the correct address.
post #2539 of 7904
Quote:
Originally Posted by M-13 View Post
 

 

So this is just a lot of guess work since I own neither at this point:


I think the output current of the X5 is 460mW into 16ohms (according to Fiio). I'm assuming Fiio capped it at 460mW, so it should still be that at 9ohms, which is A LOT for an IEM. It's almost half a watt. Your 846 will be thundering.

 

Thiis is not current, it's power.  Divide the 16ohms from the 460mW and sqrt it.  

 

The voltage gain on both the DX90 and X5 is 2.8Vrms (according to spec). Assuming this is true, and ignoring that Chinese dude's measurements the DX90 has the potential to match the X5 in terms of current, but I'm not sure if Ibasso capped it lower than Fiio. I think they might have. If you're looking for max current I think X5. If you're looking at other sound quality factors, perhaps DX90?

 

This is not gain, voltage output at a gain.

 

Obvioiusly this is just a guess and nothing more than preliminary musing based on nothing. What's ironic is that the DX90 actually has the bigger voltage swing, which is 10v p-p, while the X5 does >8V p-p. Not sure why Ibasso capped it so low? perhaps to achieve those nice THD numbers?

 

To be perfectly honest I'm pretty much baffled by Ibasso's numbers. Why?

Because according to them the DX90 does +/- 5V,

which is 10 Vp-p

which means it should be doing 3.54Vrms at 32ohms and giving us 391mW at 32ohms (more than the X5)

Instead they say on High gain it's doing 2.8Vrms, but this Chinese dude is measuring it at 2.1Vrms. I'm assuming they capped the max current for headroom? Fiio's numbers actually align perfectly with their stated peak to peak values and what the dude measured, in fact it exceeds the numbers by a little bit.

 

Yes, it should be around 3.5Vrms around most load since output impedance is less than .1ohms.  I get 110mA for current.  W is power, not current, but yeah 391mW is what you should get at that load of 32 ohms assuming it's can provide 10Vpp at max volume at max gain.  The low output impedance maximizes the power to the load so most load should get close to maximum.  


Edited by SilverEars - 4/11/14 at 3:29am
post #2540 of 7904
Quote:
Originally Posted by headwhacker View Post

Just got a mail from iBasso and they have given a tracking number from Fardar???. Thank God they shipped it to the correct address.


Good for you man. I still haven't gotten my tracking, but then again I didn't order in the first few hours like most folks here.

post #2541 of 7904
post #2542 of 7904

i ordered the 2nd hours it put out for sale not a single email... Hiaz... did we paid for express shipping?

post #2543 of 7904

I think Chinese guy is measuring the maximum voltage and power output that hits the THD 1% mark, not what maximum it's capable of.

 

This means, X3, X5, and DX100 are more capable of driving less sensitive headphones at high volume with less distortion, that is if the headphones needs that much power.


Edited by SilverEars - 4/11/14 at 3:52am
post #2544 of 7904
If that is true, then it renders the high gain on DX90 useless.
post #2545 of 7904
Quote:
Originally Posted by SilverEars View Post
 

I think Chinese guy is measuring the maximum voltage and power output that hits the THD 1% mark, not what maximum it's capable of.

 

This means, X3, X5, and DX100 are more capable of driving less sensitive headphones at high volume with less distortion, that is if the headphones needs that much power.

So the reason why he is checking for what max V and W it can output at 1% THD is because theoretically, less than that is not audible.

post #2546 of 7904
Quote:
Originally Posted by M-13 View Post
 

 

Obvioiusly this is just a guess and nothing more than preliminary musing based on nothing. What's ironic is that the DX90 actually has the bigger voltage swing, which is 10v p-p, while the X5 does >8V p-p. Not sure why Ibasso capped it so low? perhaps to achieve those nice THD numbers?

 

 

James from Fiio said the the X5 is +/- 6v. So maybe the 8v p-p on their specs page means they capped it at 8v for headroom, while ibasso with +/- 5v capped it lower than the 8v of X5 which would explain the outcomes.


Edited by T.R.A.N.C.E. - 4/11/14 at 4:02am
post #2547 of 7904

Anyone in EU got their tracking number yet?

post #2548 of 7904
Quote:
Originally Posted by T.R.A.N.C.E. View Post
 

James from Fiio said the the X5 is +/- 6v. So maybe the 8v p-p on their specs page means they capped it at 8v for headroom, while ibasso with +/- 5v capped it lower than the 8v of X5 which would explain the outcomes.


Ah makes sense then... so Fiio is giving us the numbers where they capped it and Ibasso is giving us numbers before cap. I wish Ibasso would give us the numbers where they capped as that would reflect what it was capable of.

 

Assuming Ibasso and Fiio are using the same ratio for headroom then the DX90 should have an actual voltage swing of +/- 3.33V with rms of 2.356, which is closer to what the Chinese dude measured. Hmm... now I think I "get it".


Edited by M-13 - 4/11/14 at 4:23am
post #2549 of 7904

Nope, nothing yet. Will post when either the tracking number or the DX90 arrives ;).


Edited by theebag - 4/11/14 at 4:38am
post #2550 of 7904
No email. No tracking. No nothing.....
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