I have both the Denon d2000 and HD650, and the O2 does an excellent job driving them. I do not have the urge to try any other headphoneamplifier after having listened to the O2. And i have owned more than 20 headphoneamplifiers from various well known  manufacturers. For my ears it fullfills all...

re upstateguy   My source is a desktop computer paired with a Cambridge DacMagic,

re upstateguy   My O2 is not clipping. headphones I use are Sennheiser HD650 and AKG K601.

I just love my Objective O2 amp. I have used it for several hours each day since I got it from Mr.Slim. It is paired with a Cambridge Dacmagic and a desktop computer. I like it more than my Decware CSP2 and Stax Srm-1/Mk2 with Stax lambda Pro. My Decware is for sale, and the Stax system was sold...

I have, and have had a lot of headphone amps. With this objective O2 I feel that it fulfills all that I need in a headphoneamp. I will now sell all my other headphoneamps which consist of Stax, Decware Audio, Meier audio, Ibasso, and other companies. I will make one more heaphoneamp buy, and...

I received an Objective O2 from Mr.Slim yesterday. I find it to be an amazing amplifier for a very cheap price. The build quality from Mr.Slim is excellent, and the O2 is now my main headphone amplifier. Headphones used; Sennheiser HD650.

Yeah! I know NwAvguy is the inventor, but I thought I was not allowed to mention his name here :) 

I think Mr.Slim offers the O2 for a very good price! And it is great to be of the first people getting a completely new design from the very educated inventor of the O2.

Great review! I have allready ordered one from Mr. Slim. And later I will buy the desktop version.

Same here. I want this headphone amplifier as fast as possible!

I just found this: "Trade In We will give you credit for your old headphone amplifier toward the purchase of any new Headstage amp. Please notice that the upgrade price must be $80 or more and we can only upgrade one old amp to one new order. The old amp may be faulty and can be damaged...

I tried the Arrow with a pair of Etymotic ER-4P. There were no hiss!

I received my "Arrow" 29 days ago, and I have fallen asleep with it every single night after that! I am so satisfied with it that my RSA Tomahawk, iBasso D10, iBasso P3+ and my Corda 3Move has been forgotten in the drawer! I use it with several hadphones I got: Sennheiser HD595, 600, 650, Denon...

http://www.head-fi.org/forums/f105/w...-arrow-461344/

9,8cm x 5,4cm x 0,8cm!

I tried to compare the iBasso D10, Meyer Move3 and the Headstage Arrow E with an imod and a pair of Sennheiser HD600. To me they all sounded very good! I am not capable of telling which one of them is best. But for one with better ears I guess that may be possible. But some of the features the...

I think this is a great bargain! Tonight I will fall asleep with the Arrow, imod and a pair of Sennheiser HD600.

I listened to it for about 3 hours when I went to bed yesterday. I used an imod and a pair of marklmodded Denod D2000 Deluxe. I had the gain on 1 and the crossfeed on 1. I liked it very much! I also have Ray Samuels Tomahawk, iBasso P3+, iBasso D10 and Meyer Corda Move3. I haven`t compared them...

Today I received my Headstage Arrow! It looks really nice! The listening session I have to do later.

I want a sleep function!

Hi Shauntell47! No I haven`t received it yet. I guess i have been waiting for almost 6 month! If I receive it I will post here!

I liked my Heed Canamp in the beginning! But after a while I got radio signals through it. I gave it away to my father in law, who lives in Russia, but he got the same problems there. So buying this unit, was a totally waste of money! Approximately 500 dollars lost!

It took 3 weeks from I ordered the Ms1i, till I received them. I think these are a real bargain!

I use the Decware Csp2 daily with a pair of Sennheiser HD650. I think it sounds very good! In the beginning I used it with a pair of markl-modded Denon D2000 Deluxe and I even liked that combination!

x2