[ebe2000]

Had a quick look at P5, not for me, I stay balanced ( unless I am too drunk )

 

[ebe2000]

I shall do so, am travelling next 2 weeks, so it will be some time

 

[HiFlight]

There is now a Topkit Ultra available for the P4/P5 and PB2. It uses custom buffer modules for increased output current and extended bandwidth.

I'd recommend three sets as the summary of my trial an error)

1. LME49990 (sold separately) + dummy buffers (included in the package with PB2) - recommended for anyone as it is the easiest to install (plug and play) and has a very nice sound quality.
2. HiFlight's kit which is not pricey but offers good quality op-amps and buffers for any sound signature you'd prefer (cold, neutral, warm)
3. MUSES01 + LT1028ACN8 - recommended for crazy ones only like me as it has A LOT of caveats and conditions to work properly inside PB2 including appropriate power supply, location, heatsinks, and other dependencies. Failure to comply with them will give you the worst sound you've ever heard but if you are successful you'll get the best sound you've ever heard. Although the sound signature is more neutral from No1 variant (beware it has less bass but sounds a lot more hi-fiish to my ears) so apply with caution or better not even try if you're scared...

As for Bursons, the specification seems fine to me, they should work with PB2 without power tweaks but they are huge. I would try them if I were not completely satisfied with my current setup. I can't imagine there's room for improvement.

And advice by default: balanced connection only and good headphones is a must, else you'll not hear any difference between almost any upgrades or they will be just minimal.

PS Today I've found the topic about iBasso P5 Falcon (http://www.head-fi.org/t/752829/fresh-from-the-oven-ibasso-p5-falcon)which is a fresh portable amp soon to appear on the market. This one will supposedly be good with non-balanced headphones.

 

[ebe2000]

There is now a Topkit Ultra available for the P4/P5 and PB2. It uses custom buffer modules for increased output current and extended bandwidth.

And what is included in this top kit?

 

[ebe2000]

   
You are the man! 

 
Please tell us about your experience when they arrive.

Well, I got back home, the Burson´s were here and in the PB2 before I could even say hello to my wife. Wow, am really glad I did go this way. Out of the box, what an improvement, in absolute everything. Fully worth the money. I don´t think there can be anything better out there - mobile. Probably gets even better after burn in. Enough power with the dummy buffers. I shouldn´t say more, otherwise all the amp manufacturers want sell their stuff anymore. This is rather High-end then Hifi.

 

[privilege15]

Thanks for the input. When the time comes I'll try them as well.

 

[Paul - iBasso]

 
Well, I got back home, the Burson´s were here and in the PB2 before I could even say hello to my wife. Wow, am really glad I did go this way. Out of the box, what an improvement, in absolute everything. Fully worth the money. I don´t think there can be anything better out there - mobile. Probably gets even better after burn in. Enough power with the dummy buffers. I shouldn´t say more, otherwise all the amp manufacturers want sell their stuff anymore. This is rather High-end then Hifi.

Do you have any images to post? Glad you are enjoying the PB2.

 

[ebe2000]

Sorry, no better quality pic at 01:30AM, but this is showing the Bursons on "stilts". Have to find a way to cut out two holes for the cables and piggyback the Bursons somehow.

 

[ebe2000]

  Thanks for the input. When the time comes I'll try them as well.

Be careful though, you might not want to get your headphones off anymore.

 

[privilege15]

   
Sorry, no better quality pic at 01:30AM, but this is showing the Bursons on "stilts". Have to find a way to cut out two holes for the cables and piggyback the Bursons somehow.

 
The burson opamps must come in aluminum tubes. I would make the holes for extension cords, then fasten the tubes on the body of the amplifirer and then put the bursons inside them to protect.

 

[privilege15]

FYI, you can stack sockets to make them stand upright above the battery like in the picture:
 

 

[privilege15]

 
Be careful though, you might not want to get your headphones off anymore.

Which retailer did you buy burson opamps from? The only one I found which does international worldwide shipping is http://www.partsconnexion.com/. Are there any alternatives on the market?

 

[ebe2000]

  Which retailer did you buy burson opamps from? The only one I found which does international worldwide shipping is http://www.partsconnexion.com/. Are there any alternatives on the market?

I bought them from Partsconnexion, they are the official Burson dealer. The Burson´s come with a life time guarantee.

 

[ebe2000]

   
The burson opamps must come in aluminum tubes. I would make the holes for extension cords, then fasten the tubes on the body of the amplifirer and then put the bursons inside them to protect.

Good idea. I think I will actually lay them horizontally onto the PB2 top lid and use silicon as a glue and insulator. Their diameter is slightly more then the PB2´s width.

 

[batracom]

Apologies if this sounds simplistic or has been answered before, but am looking to get the LME49990 on a DIP8 adaptor for my PB2. Would a "dual" configuration, such as this one:
http://www.ebay.co.uk/itm/DUAL-SOIC-LME49990-DIP8-ADAPTER-/201320580342?pt=LH_DefaultDomain_0&hash=item2edfa444f6
 
be fine, or should I get four singles, 
http://www.ebay.co.uk/itm/2PCS-LME49990-SINGLE-DIP8-ADAPTERS/201213280939?_trksid=p2047675.c100009.m1982&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D20140328180637%26meid%3Da77cbdc0a048494d9d52b76a7ade20d7%26pid%3D100009%26rk%3D2%26rkt%3D5%26sd%3D201320580342
 
 
Many thanks for any assistance!