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[meat01]

You have to contact iBasso if you want to know.

They told me both of them are not their distributor, but they get supplied by their distributor. If you have any problems you'll have to go through prostudios and they will tell you what to do next

 
Uum their web site is not even up.  How do we contact them?

 

[MagicKnights]

So after you disabled signature enforcement you restarted and chose advance start up then boot with signature enforcement off? You have to boot from the advance start up every time or it wont work, or at least it's that way for me.

 
Yeah, disabled digital signature enforcement and have been booting with digital signature off ever since.
 

Also try disabling other sound drivers as they may interfere

 
Tried that as well.
 
I have a hard time giving up on these kinds of things so I'm sure I'll keep trying to get it to work. It's unfortunate how much trouble it is to get some audio hardware drivers functioning properly. This reminds me of all the headaches I went through trying to get the audio interface MR816 drivers working.

 

[bobby12]

Uum their web site is not even up.  How do we contact them?

if you bought it through amazon then mail the seller through amazon

 

[bobby12]

Yeah, disabled digital signature enforcement and have been booting with digital signature off ever since.


Tried that as well.

I have a hard time giving up on these kinds of things so I'm sure I'll keep trying to get it to work. It's unfortunate how much trouble it is to get some audio hardware drivers functioning properly. This reminds me of all the headaches I went through trying to get the audio interface MR816 drivers working.

Yeah it acts up sometimes. I got it to work, but sometimes it randomly stops working then I have to do stuff like switch to storage then back to DAC mode, use the usb 3.0 instead of the 2.0 vice versa, change the cables. Also had to make sure the programs have ibasso as the default device

Hopefully ibasso comes out with the finished version soon.

 

[highfell]

So how does the sound from the PB2?

I don't do controlled A/B comparisons. So I haven't tried to compare the PB2 in balanced or unbalanced mode, plus my headphone cable is different in any case.

But in balanced output, I find more detail and a clearer separation and a greater ease in the driving of the HD600s. There seems to be greater presence, immediacy & oomph to the music.

My volume is way below half way but the sound level is more than enough.

I would also add that the OPamps do make a difference. The Muses01 provide both detail and an impact that none of my other Opamps do.



I prefer to listen to the DX90 with a headphone amp at all times, even when travelling with IEMs as long as I am able to layout my hifi stuff onto a table or tray on the train.

 

[intlsubband]

   
I have used the PortaTube with my Mad Dogs and my Alpha Dogs when I had them and while they do sound fantastic as a combination they are still a little underpowered.
The t50rp planars eat up the power.  They just open up more and more as you pour more into them.
 
 
 
I have used the PB2 with the Mad Dogs and Alpha Dogs.  Personally I didnt feel it.  That is just me though so take this with a grain of salt.
Before you get the PB2, if you can find a e12DIY to audition I would highly recommend it.  It was easily my favourite portable amp with the Mad/Alpha Dogs.
It is nothing like the regular e12, and also offers OPAMP and Buffer rolling like the PB2.
It isn't anywhere near as powerful as the pb2 on paper, but it certainly doesnt sound that way.

 
Thanks heaps for that tip!
 
I have no technical knowledge and never even considered opamp & buffer rolling... so it might not be for me.

 

[highfell]

Here's a question - can the PB2 outputs balanced signal even when the input is unbalanced? given that the DX90 doesn't have a balanced output.

Thanks!

Technically I guess that it is a hybrid variant. I don't worry too much about it.

But I have no doubt it sounds more balanced this way round - unbalanced input/ balanced output - than if it were the other way round ie balanced input/unbalanced output -

 

[Wyd4]

   
Thanks heaps for that tip!
 
I have no technical knowledge and never even considered opamp & buffer rolling... so it might not be for me.

 
Oh dont fear these amps for this reason.
 
a) Opamp rolling etc in these amps is very easy.  There is a lot of info regarding the best combo's for the PB2 in particular.
b) they both sound good out fo the box in stock form, particularly the e12DIY
 
They are good out of the box, but allow for changing should you feel like something is missing etc.

 

[highfell]

Oh dont fear these amps for this reason.

a) Opamp rolling etc in these amps is very easy.  There is a lot of info regarding the best combo's for the PB2 in particular.
b) they both sound good out fo the box in stock form, particularly the e12DIY

They are good out of the box, but allow for changing should you feel like something is missing etc.

Yep - generally it is just plug & play. You have to be careful with matching, but to be honest I knew absolutely zero about the PB2 until 9 months ago. I read the PB2 thread and became 'knowledgeable' thanks to the expertise of others.

Oh by the way it is a lot of fun.

And instead of changing the complete headphone amp, you can just change a buffer or Opamp instead and (sort of) achieve same end result.

 

[intlsubband]

I guess I imagined soldering and such...

 

[nc8000]

Technically I guess that it is a hybrid variant. I don't worry too much about it.

But I have no doubt it sounds more balanced this way round - unbalanced input/ balanced output - than if it were the other way round ie balanced input/unbalanced output -

These amps (also my SR71-B) include a splitter/inverter circuit that creates a balanced signal from a single ended input signal. Not quite the same as a propper balanced input but still better than single ended output

 

[nmatheis]

I guess I imagined soldering and such...

I've got an E12 DIY and was worried at first. It comes with several opamps and buffers which are plug n play to get you started - no soldering required. You can order more opamps which are plug n play BUT you'll probably have to file down the inside of the case a bit to accommodate the extra height OR rely on generous headfi-ers to solder smaller opamp/adapter combos for you. I've done both. There are instructions for filing down the case, buffer/opamp orders, and many buffer/opamp impressions in the dedicated E12 DIY thread: LINK.

 

[intlsubband]

I've got an E12 DIY and was worried at first. It comes with several opamps and buffers which are plug n play to get you started - no soldering required. You can order more opamps which are plug n play BUT you'll probably have to file down the inside of the case a bit to accommodate the extra height OR rely on generous headfi-ers to solder smaller opamp/adapter combos for you. I've done both. There are instructions for filing down the case, buffer/opamp orders, and many buffer/opamp impressions in the dedicated E12 DIY thread: LINK.

 
Thanks heaps. I didn't realise it was a plug & play affair, and that it already comes with alternate ones. I might give it a go some day.

 

[jamato8]

I've got an E12 DIY and was worried at first. It comes with several opamps and buffers which are plug n play to get you started - no soldering required. You can order more opamps which are plug n play BUT you'll probably have to file down the inside of the case a bit to accommodate the extra height OR rely on generous headfi-ers to solder smaller opamp/adapter combos for you. I've done both. There are instructions for filing down the case, buffer/opamp orders, and many buffer/opamp impressions in the dedicated E12 DIY thread: LINK.

I use op amps without filing down the inside. Snug fit but it works fine. There is a difference between the PB2 and E12 DIY with regards to driving some phones. IMO, the HD600 and 650 sound their best balanced and for me, the 650's only come to life and sound very good, when balanced and not single ended. 

 

[nmatheis]

I use op amps without filing down the inside. Snug fit but it works fine.

Some can, some can't. Mine can't. DIP8 opamps would've required me to flex the board to close the case, so I used a Dremel and file to create a recess for them. Works just fine now with no stress on the board.