Head-Fi.org › Forums › Equipment Forums › Portable Headphone Amps › The iBasso T4, tinier than the T2 and better . . with more new images page 1,5, 14 . .
New Posts  All Forums:Forum Nav:

The iBasso T4, tinier than the T2 and better . . with more new images page 1,5, 14 . . - Page 13

post #181 of 733
I checked my newly purchased T4 and it does have LMH66 & 47µF caps. Those tiny screws are a SOB.
post #182 of 733
I can't read the opamp - is that a LMH6622, 6643 or 6655?
post #183 of 733
Received my T4 today. Soundwise I really like it, but the hiss is just annoying. Also mine has an audible channel imbalance independent from volume or earphones.

seehee
post #184 of 733
Quote:
Originally Posted by seehee2k View Post
Received my T4 today. Soundwise I really like it, but the hiss is just annoying. Also mine has an audible channel imbalance independent from volume or earphones.

seehee
Which IEMs are you using?

I hear very little to no hiss:

I've given my T4 75+ hours to settle. With my ER4P I get absolutely zero noise at full volume in high or low gain with no source connected. With my i7 connected with music paused and with volume on i7 at full ( 40/40) I hear noise creeping in at volume setting on T4 at 7 in low gain.
post #185 of 733
Quote:
Originally Posted by GreatDane View Post
Which IEMs are you using?

I hear very little to no hiss:

I've given my T4 75+ hours to settle. With my ER4P I get absolutely zero noise at full volume in high or low gain with no source connected. With my i7 connected with music paused and with volume on i7 at full ( 40/40) I hear noise creeping in at volume setting on T4 at 7 in low gain.
I'm using UM2 and a pair of less sensitive Customs (Compact-Monitors Stage 3). The hiss increases with the volume (without a source connected).

seehee
post #186 of 733
Quote:
Originally Posted by IvanH View Post
Notice that the print layout is also different, under the 6,3v 1200uf.

I have written a message to iBasso, and asked
why there are 2 different print layouts and different components.
What the advantages / disadvantages are between the two and
Which one I will get if I order one.

I will post the answer as soon as I get it.

My response from iBasso:
----
Dear Sir,
Thank you for your email.
There are two version of T4.
The first 100 units T4 uses AD8656+AD8616+Nichicon FW caps. we launched second solution after the first 100 units gone.
The second version of T4 uses AD8656+LMH6643+Elna silmic 2nd Caps.
The 1200uf 6.3V rubyycon cap are same in two versions. Your pictures just showing the top and the bottom of the same cap.
The circuit desigan of these two version are same. Just different components. The first version has better soundstage. The second version has better mid and bass response.
The hiss of there two version are both well controlled. The are in the some level.

Sincerely
iBasso Audio
----
post #187 of 733
Does anybody know what practical difference it makes that the 100uf caps has been changed to 47uf?
Battery time/SQ/etc. ?
post #188 of 733
Quote:
Originally Posted by IvanH View Post
----
[...]The hiss of there two version are both well controlled. The are in the some level.[..]
----
I would call it anything but well controlled, it hisses like a damn Nintendo DS.

Does anyone know an amp that doesn't hiss like the T4, with a similar tiny form factor and good audio quality? I'm pretty sure the FiiO E5 doesn't apply, how about the NuForce - anyone has any experience with it, hiss- and quality-wise?

EDIT: Just saw Skylab's evaluation of the NuForce, it's probably not my cup of tea.
post #189 of 733
Mine is going back for testing and evaluation. Hopefully there is a solution for my problems but I doubt it.

@dfkt: I think there's no real alternative. Maybe the Xin SuperMicro, but those come with a rediculous long waiting time...
post #190 of 733
It seems like I got the 2nd version. To tell the truth, I still prefer E5 most of the time, both price/performance ratio and convenient wise. Good thing that I don't use any of my sensitive IEM with amp, so no need to worry about hiss... but I do care about how scratch prone T4 is, so far it already has 4 small marks on them
post #191 of 733
Quote:
Originally Posted by ClieOS View Post
... but I do care about how scratch prone T4 is, so far it already has 4 small marks on them
I put a screen protector from DealExtreme on my T4, it works well so far. I had to cut it to size, of course.
post #192 of 733
Yeah, I already put screen protector both front and back, a bit too late but better than none.
post #193 of 733
Quote:
Originally Posted by seehee2k View Post
Mine is going back for testing and evaluation. Hopefully there is a solution for my problems but I doubt it.

@dfkt: I think there's no real alternative. Maybe the Xin SuperMicro, but those come with a rediculous long waiting time...
I'm thinking of soldering two resistors straight before the phone-out plug into the case. I hope that's possible and there's enough space. I'll have to take a look...
post #194 of 733
Quote:
Originally Posted by dfkt View Post
I'm thinking of soldering two resistors straight before the phone-out plug into the case. I hope that's possible and there's enough space. I'll have to take a look...
Are you shure that won't alter its signature?

@ClieOS: The T4 is much superior to the E5, which lacks of overall precision. Soundstage and detail are much better in my opinion. Amount of hiss is about the same.
post #195 of 733
Quote:
Originally Posted by seehee2k View Post
@ClieOS: The T4 is much superior to the E5, which lacks of overall precision. Soundstage and detail are much better in my opinion. Amount of hiss is about the same.
I do have both to compare with, and yes, I agree T4 is superior in all accounts. However, it is not how T4 performs that I don't like, but how E5's better price/performance ratio and convenient that I prefer over T4 (plus no worry about scratching E5). For me (in very subjective term), I'll say E5 is about 70% of T4. It certainly isn't as good, but I can live with that. I don't really care about hissing cause if my IEM is so easy to drive that it can detect hiss, than I won't use an amp with it at all.
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Portable Headphone Amps
Head-Fi.org › Forums › Equipment Forums › Portable Headphone Amps › The iBasso T4, tinier than the T2 and better . . with more new images page 1,5, 14 . .