Have the O2 for sometime already, I use it to drive audio technica cks77 and sen hd650. I feel it is lacking in bass to my liking, I found this mod in DiyAudio http://www.diyaudio.com/forums/headphone-s...tml#post2924330 look at post 59, the guy listed out how to do it. I have done it, and I don't have a switch like him to turn it on/off, mine stay on all the time. I found the extra bass I need after the mod. If you want some more bass with O2, you should try this mod, adding the C value will give you higher bass boost.

Can this small item drive shure se 535 iem properly ?

It is design to drive most of the h/p, it shouldn't be a problem to drive shure se535. You can google around, I am sure some shure owner has mention it some where in Internet.

Thanks for the info...
Quite interested in this product....

Can put into certain size pocket but won't be light as normal portable amp.....

Xdd...great plan
Battery consumption or rechargeble??

I copy this out for you "RUN TIME - The default design with 250 mAH Ni-MH batteries has 7 – 9 hours of run time on a charge. "

You can read all about it here http://nwavguy.blogspot.com/2011/08/o2-details.html

You should got the answer there.

Some hard work before New Year...

a fast test on power, based on volume knob:

1. Miracle CIEM, less than 8 o clock twist
2. DT770 250 ohm 10-11 o clock twist
3. DrVero 150 9-10 o clock twist
4. XP 1 and 3 less than 8 o clock twist

so much power in this thing~

not bad wor this amp
really that transparent ar ?

it really showed me that my Miracle is relatively flat and accurate placement of instruments than of my dt770

i would like to ask a noob question, do those active speaker with amp built in got performance improved by this little amp?

if my dac able to drive my 56ohm headphone in 40% player volume, do i still need this amp?

This post has been edited by ego draconis: Jan 5 2013, 04:38 PM

it will become double amping, which no one can be certain it will sound like what, for your situation, if you using on a pc, take the odac, and use the speaker amp, if for living room, then i dont know

i got a ud100 ald, powerful enuf to drive headphone, just wonder is it worth to add on this amp> ...so basically this amp suit for headphone user only? im using both speaker and headphone, IEm

Come to Penang for audition.....

lol, btw im at nibong tebal, i noe u at BM but no car go there ...haha

NT to me is near only,often go there.....

Next Saturday free or not???

Leolabs will be associating with Coconut-3D to produce Objective 2 headphone Amplifier. Official launching soon.




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