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The iBasso D12, dual dacs . images . new Sysconcept optical cable . . Topkit by HiFlight. . - Page 8

post #106 of 601
Thread Starter 

I wish "I" could. Mine is still stuck in China at the airport as bad weather kept it on the ground on the 29th and 30th and for some reason, it is still there!

post #107 of 601

I'll definitely be getting one from the next batch. But with so many portable amps, I would probably use it half the time as DAC only.
 

Quote:
Originally Posted by jamato8 View Post

I wish "I" could. Mine is still stuck in China at the airport as bad weather kept it on the ground on the 29th and 30th and for some reason, it is still there!

post #108 of 601

Just a question to see if anyone else has witnessed this behavior with the D12.  When you turn it off, you can hear the normal gentle "pop" as the amp turns off.  However, with my D12 there is a very impressive mini-jet-like whine that occurs about 2-3 seconds after powerdown.  I've never heard an amp make this noise...just curious if they all do this.

 

I've also noticed that the D12's input manager seems to be doing a very good job as compared to the D10 (which already worked well).  As I change inputs or turn sources on and off, the D12 is picking them up flawlessly whereas my D10 occasionally has to be turned off and on again to acquire the signal. 


Edited by wolfen68 - 10/3/10 at 7:21am
post #109 of 601

Could be the caps discharging?

 

That's good that they improved the  auto input selection on the D12.
 

Quote:
Originally Posted by wolfen68 View Post

Just a question to se if anyone else has witnessed this behavior with the D12.  When you turn it off, you can hear the normal gentle "pop" as the amp turns off.  However, with my D12 there is a very impressive mini-jet-like whine that occurs about 2-3 seconds after powerdown.  I've never heard an amp make this noise...just curious if they all do this.

 

I've also noticed that the D12's input manager seems to be doing a very good job as compared to the D10 (which already worked well).  As I change inputs or turn sources on and off, the D12 is picking them up flawlessly whereas my D10 occasionally has to be turned off and on again to acquire the signal. 

post #110 of 601

Depending on which opamps/buffers I have in my D10, I've occasionally heard the whine.

post #111 of 601


 

Quote:
Originally Posted by wolfen68 View Post

Just a question to see if anyone else has witnessed this behavior with the D12.  When you turn it off, you can hear the normal gentle "pop" as the amp turns off.  However, with my D12 there is a very impressive mini-jet-like whine that occurs about 2-3 seconds after powerdown.  I've never heard an amp make this noise...just curious if they all do this.

 

I've also noticed that the D12's input manager seems to be doing a very good job as compared to the D10 (which already worked well).  As I change inputs or turn sources on and off, the D12 is picking them up flawlessly whereas my D10 occasionally has to be turned off and on again to acquire the signal. 


Yes, this is normal behavior.  As the power reserve in the caps is exhausted, the opamps often oscillate a bit before shutting down completely. 

 

Such sound is perfectly harmless.  

post #112 of 601

I wonder if the D12 is better isolated to RF interference than the D10?

post #113 of 601
Thread Starter 

Woo Hooo. . . I got my D12. It arrived today on island after being grounded due to weather in China. The mids are different, as noted, and I like them. They are full but very well defined. I am using the HD650's right now and it is driving them surprisingly well. I am using my converted iRiver using the coax out to the coax input of the D12. Those dual dacs do a fine job. 

post #114 of 601

Can we look forward to one of your fine reviews..

post #115 of 601
Congrats John, looking forward towards your impressions.
post #116 of 601

Definitely more impressions would be nice.

post #117 of 601
Thread Starter 

I find that I want to make sure on what mine are, impressions. I will say that I am surprised that this lower voltage amp drives the HD650's so well. The bass is solid and the mids are excellent. The highs are clean and there is a good transparency to the sound. Now I have said this about other amps but it is the degree of difference that of course makes the difference. I need to compare some to give my impression. I want to compare to the fi.Q, since as a single ended amp, it is excellent, IMO. I will say though that the D12 is a step up from the D10. The dual dacs help and the things iBasso has learned on making everything better. 

post #118 of 601

I really like the sound of the OPA637BP biased Class A with bypassed buffers in the D12. It seems quite stable and sound great.  Huge downside is the $35 cost of each opamp!   I am currently using bypassed buffers.  The AD8022 and LT1213 also have worked well as buffers with the 637 but LR + buffers do draw a fair amount of quiescent current. 

My D12 is currently driving my K-501s very well using high gain with the bypassed buffers.  The 2-part case is a huge improvement if one does much opamp rolling.


Edited by HiFlight - 10/5/10 at 7:46pm
post #119 of 601
Thread Starter 

I can't find my 637's. I sent a pair back with a fi.Q to Ryuzoh and didn't get them back. I had them for a long time. 

 

Sysconcept may come out with a new better than ever optical cable. It is multistrand, low modal dispersion and a bending radius of 1mm vs 2cm of the older one, 1mm! It should have a better bit rate and lower distortion of the optical signal (jitter, reflections). 


Edited by jamato8 - 10/5/10 at 10:36pm
post #120 of 601

Guys,

For people planning to purchase it or who have it, how do yo plan to deal with the battery replacement ? Is it something that can be done without any soldering in the D12 ?

Thank you !

Lionel

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